{"id":30487,"date":"2026-09-10T09:02:28","date_gmt":"2026-09-10T01:02:28","guid":{"rendered":"https:\/\/techclass.wfjydl.com\/?p=30487"},"modified":"2026-09-09T17:03:18","modified_gmt":"2026-09-09T09:03:18","slug":"%e4%bd%8e%e8%be%b9%e5%bc%80%e5%85%b3%e7%9a%84%e8%ae%be%e8%ae%a1%ef%bd%9cnpn%e6%99%b6%e4%bd%93%e7%ae%a1%e7%9a%84%e7%94%b5%e8%b7%af%e8%ae%be%e8%ae%a1","status":"publish","type":"post","link":"https:\/\/techclass.wfjydl.com\/knowledge\/transistors\/transistors-basic\/23727","title":{"rendered":"\u4f4e\u8fb9\u5f00\u5173\u7684\u8bbe\u8ba1\uff5cNPN\u6676\u4f53\u7ba1\u7684\u7535\u8def\u8bbe\u8ba1"},"content":{"rendered":"

\u4f4e\u8fb9\u5f00\u5173\u662f\u4e00\u79cd\u5229\u7528NPN\u6676\u4f53\u7ba1\u63a7\u5236\u8d1f\u8f7d\u4e0eGND\u4e4b\u95f4\u7535\u6d41\u7684\u7535\u8def\u3002\u8fd9\u79cd\u7b80\u5355\u7684\u7535\u8def\u7ed3\u6784\uff0c\u4f5c\u4e3a\u901a\u8fc7\u5fae\u63a7\u5236\u5668GPIO\u4fe1\u53f7\u9a71\u52a8\u7ee7\u7535\u5668\u3001\u7535\u673a\u7b49\u8d1f\u8f7d\u7684\u57fa\u7840\u89e3\u51b3\u65b9\u6848\uff0c\u88ab\u5e7f\u6cdb\u5e94\u7528\u4e8e\u5de5\u4e1a\u8bbe\u5907\u548c\u8f66\u8f7d\u7cfb\u7edf\u4e2d\u3002\u5728\u4f4e\u8fb9\u5f00\u5173\u4e2d\uff0c\u5c24\u5176\u5bb9\u6613\u5bfc\u81f4\u5931\u6548\u7684\u56e0\u7d20\u6709\u4e24\u4e2a\uff1a\u4f7f\u6676\u4f53\u7ba1\u5207\u5b9e\u9971\u548c\u7684\u57fa\u6781\u7535\u963b\u503c\uff0c\u4ee5\u53ca\u9488\u5bf9\u611f\u6027\u8d1f\u8f7d\u7684\u53cd\u7535\u52a8\u52bf\u5e94\u5bf9\u63aa\u65bd\uff08\u4f8b\u5982\u4e8c\u6781\u7ba1\u3001\u94b3\u4f4d\u7535\u8def\uff09\u3002\u672c\u6587\u5c06\u4ee5\u8fd9\u4e24\u70b9\u4e3a\u6838\u5fc3\uff0c\u68b3\u7406\u5b8c\u6210\u8bbe\u8ba1\u7684\u6574\u4e2a\u8fc7\u7a0b\uff0c\u5305\u62ec\u5668\u4ef6\u9009\u578b\u3001\u635f\u8017\u3001\u53d1\u70ed\u3001\u5e03\u7ebf\u53ca\u5b9e\u9645\u88c5\u673a\u9a8c\u8bc1\u7b49\u5404\u4e2a\u6b65\u9aa4\u3002\u5173\u4e8eNPN\u6676\u4f53\u7ba1\u7684\u57fa\u672c\u5de5\u4f5c\uff0c\u5728\u201cNPN\u6676\u4f53\u7ba1\u8be6\u89e3\uff5c\u4f4e\u8fb9\u5f00\u5173\u57fa\u7840<\/a>\u201d\u4e2d\u6709\u8be6\u7ec6\u4ecb\u7ecd\u3002\u5173\u4e8e\u53cc\u6781\u6676\u4f53\u7ba1\u6574\u4f53\u7684\u57fa\u7840\u77e5\u8bc6\uff0c\u8bf7\u53c2\u9605\u201c\u53cc\u6781\u6676\u4f53\u7ba1\uff5c\u5de5\u4f5c\u539f\u7406\u53ca\u4f7f\u7528\u65b9\u6cd5\uff08NPN\/PNP\uff09<\/a>\u201d\u3002<\/p>\n

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\"NPN\u4f4e\u8fb9\u5f00\u5173\u7684\u57fa\u672c\u7ed3\u6784\"<\/p>\n

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\u9879\u76ee<\/th>\n\u89c4\u683c<\/th>\n<\/tr>\n<\/thead>\n
\u5fae\u63a7\u5236\u5668\u7535\u6e90<\/td>\n5 V<\/td>\n<\/tr>\n
GPIO\u8f93\u51fa<\/td>\n5 V\uff0c\u6bcf\u4e2a\u7aef\u53e3\u6700\u5927\u7535\u6d4120mA<\/td>\n<\/tr>\n
\u8d1f\u8f7d<\/td>\n5V\u9a71\u52a8\u7684\u5c0f\u578b\u7ee7\u7535\u5668<\/td>\n<\/tr>\n
\u7ebf\u5708\u7535\u6d41<\/td>\n200 mA<\/td>\n<\/tr>\n
\u6676\u4f53\u7ba1<\/td>\nNPN\u5c0f\u4fe1\u53f7\uff08\u6700\u5927\u7535\u6d41 IC(max)<\/sub> 500mA\u7ea7\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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\"5V\u5fae\u63a7\u5236\u5668\/200mA\u7ee7\u7535\u5668\u8bbe\u8ba1\u793a\u4f8b\"<\/p>\n

\u8bbe\u8ba1\u793a\u4f8b\u2461\uff1a\u4f7f\u75283.3V\u5fae\u63a7\u5236\u5668\u9a71\u52a870mA\u7535\u78c1\u9600<\/h3>\n

\u5047\u8bbe\u4f7f\u75283.3V\u5fae\u63a7\u5236\u5668\u9a71\u52a8\u5c0f\u578b\u7535\u78c1\u9600\uff0c\u8fd9\u662f\u4e00\u79cd\u8fd1\u5e74\u6765\u9010\u6e10\u589e\u591a\u7684\u8bbe\u8ba1\u573a\u666f\u3002<\/p>\n\n\n\n\n\n\n\n\n\n\n
\u9879\u76ee<\/th>\n\u89c4\u683c<\/th>\n<\/tr>\n<\/thead>\n
\u5fae\u63a7\u5236\u5668\u7535\u6e90<\/td>\n3.3V<\/td>\n<\/tr>\n
GPIO\u8f93\u51fa<\/td>\n3.3V\uff0c\u6bcf\u4e2a\u7aef\u53e3\u6700\u5927\u7535\u6d4112mA<\/td>\n<\/tr>\n
\u8d1f\u8f7d<\/td>\n\u5c0f\u578b\u7535\u78c1\u9600\uff08\u989d\u5b9a\u7535\u538b12V\uff09<\/td>\n<\/tr>\n
\u7a33\u6001\u7535\u6d41<\/td>\n70mA<\/td>\n<\/tr>\n
\u7535\u6e90\u7cfb\u7edf<\/td>\n\u8d1f\u8f7d\u752812V\uff0c\u5fae\u63a7\u5236\u5668\u75283.3V<\/td>\n<\/tr>\n
\u6676\u4f53\u7ba1<\/td>\nNPN\uff08\u6700\u5927\u7535\u6d41 I<\/span>C<\/span>(max)<\/sub> 200\u2013500mA\u7ea7\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5373\u4f7f\u8d1f\u8f7d\u7535\u6e90\u548c\u5fae\u63a7\u5236\u5668\u7535\u6e90\u5c5e\u4e8e\u4e0d\u540c\u7684\u7cfb\u7edf\uff0c\u4f46\u5728\u4f4e\u8fb9\u5f00\u5173\u4e2d\uff0c\u53d1\u5c04\u6781\uff08GND\uff09\u57fa\u51c6\u4e5f\u9700\u8981\u4e0e\u5fae\u63a7\u5236\u5668I\/O\u7684\u57fa\u51c6\u4fdd\u6301\u4e00\u81f4\u3002\u56e0\u6b64\uff0c\u9700\u8981\u5c06\u8d1f\u8f7d\u752812V\u7535\u6e90\u7684GND\u4e0e\u5fae\u63a7\u5236\u56683.3V\u7535\u6e90\u7684GND\u5728\u4e00\u70b9\u4e0a\u53ef\u9760\u8fde\u63a5\uff0c\u5e76\u5c06\u5e03\u7ebf\u5206\u5f00\uff0c\u4ee5\u907f\u514d\u8d1f\u8f7d\u7535\u6d41\u7684\u56de\u6d41\u6df7\u5165\u5fae\u63a7\u5236\u5668\u7684GND\u7ebf\u8def\u4e2d\uff08\u539f\u5219\u4e0a\u91c7\u7528\u661f\u5f62\u8fde\u63a5\uff09\u3002<\/p>\n

\u4e0e5V\u7cfb\u5217\u76f8\u6bd4\uff0c\u5fae\u63a7\u5236\u5668\u7684\u8f93\u51fa\u7535\u538b\u8f83\u4f4e\uff0c\u8f93\u51fa\u7535\u6d41\u7684\u4e0a\u9650\u4e5f\u8f83\u4f4e\uff0c\u8fd9\u4fbf\u4ea7\u751f\u4e86\u53cc\u91cd\u9650\u5236\u3002\u56e0\u6b64\uff0c\u80fd\u5426\u786e\u4fdd\u9971\u548c\u53d8\u5f97\u66f4\u4e3a\u91cd\u8981\u3002\u5728\u5143\u5668\u4ef6\u9009\u578b\u786e\u5b9a\u4e4b\u524d\uff0c\u9700\u8981\u5148\u786e\u8ba4\u7535\u538b\u88d5\u91cf\u548c\u7535\u6d41\u5bb9\u91cf\u3002<\/p>\n

3.3V\u65f6\uff0c\u53ef\u5206\u914d\u4e8eVBE\u548c\u57fa\u6781\u7535\u963b\u7684\u7535\u538b\u4f59\u91cf\u8f83\u5c0f\u3002\u8fd9\u4f7f\u57fa\u6781\u7535\u6d41\u7684\u8bbe\u8ba1\u53d8\u5f97\u975e\u5e38\u4e25\u82db\u3002\u5f53IO\u5f15\u811a\u7684GPIO\u7535\u6d41\u4e0a\u9650\u88ab\u9650\u5236\u57284~5mA\u65f6\uff0c\u96be\u4ee5\u901a\u8fc7\u5355\u4e2aNPN\u6676\u4f53\u7ba1\u8fdb\u884c\u9a71\u52a8\u3002\u5728\u8fd9\u79cd\u9650\u5236\u4e0b\uff0c\u9700\u8981\u8003\u8651\u5207\u6362\u4e3a\u6676\u4f53\u7ba1\u9635\u5217\u6216\u9a71\u52a8\u5668IC\u3002<\/p>\n

\"3.3V\u5fae\u63a7\u5236\u5668\/70mA\u7535\u78c1\u9600\u8bbe\u8ba1\u793a\u4f8b\"<\/p>\n

NPN\u6676\u4f53\u7ba1\uff08\u53cc\u6781\u6676\u4f53\u7ba1\uff09\u7684\u4f4e\u8fb9\u5f00\u5173\u8bbe\u8ba1\u6d41\u7a0b<\/h2>\n

\u8bbe\u8ba1\u4ece\u6240\u8981\u6c42\u7684\u89c4\u683c\uff08\u8d1f\u8f7d\u7535\u6d41\u3001\u7535\u6e90\u7535\u538b\u3001GPIO\u89c4\u683c\uff09\u5f00\u59cb\u3002\u53ea\u8981\u6309\u7167\u6d41\u7a0b\u9010\u6b65\u63a8\u8fdb\uff0c\u5373\u53ef\u5b8c\u6210\u4ece\u5668\u4ef6\u9009\u578b\u5230\u786e\u5b9a\u7535\u963b\u503c\u7684\u5de5\u4f5c\u3002\u5728\u5f00\u59cb\u8bbe\u8ba1\u4e4b\u524d\uff0c\u5148\u786e\u5b9a\u201c\u5c06\u54ea\u4e9b\u6761\u4ef6\uff08\u6e29\u5ea6\u3001\u7535\u538b\u3001\u8d1f\u8f7d\u6ce2\u52a8\uff09\u4f5c\u4e3a\u6700\u574f\u6761\u4ef6\u5904\u7406\u201d\uff0c\u53ef\u4ee5\u4f7f\u540e\u7eed\u7684\u8ba1\u7b97\u548c\u8bc4\u4f30\u66f4\u987a\u5229\uff0c\u4ece\u800c\u51cf\u5c11\u91cf\u4ea7\u65f6\u7684\u8fd4\u5de5\u3002\u4f4e\u8fb9\u5f00\u5173\u56e0\u5176\u7535\u8def\u672c\u8eab\u8f83\u7b80\u5355\uff0c\u56e0\u6b64\u524d\u63d0\u6761\u4ef6\u7684\u8bbe\u5b9a\uff08\u5c06\u54ea\u4e9b\u503c\u4f5c\u4e3a\u201c\u6700\u574f\u6761\u4ef6\u201d\u5904\u7406\uff09\u5c06\u76f4\u63a5\u5f71\u54cd\u8bbe\u8ba1\u7684\u6210\u8d25\u3002<\/p>\n

\u901a\u8fc7\u201c\u6676\u4f53\u7ba1\u8be6\u89e3\uff1a\u7ed3\u6784\u3001\u5206\u7c7b\u53ca\u5de5\u4f5c\u539f\u7406\u57fa\u7840<\/a>\u201d\u53ef\u4ee5\u5b8f\u89c2\u4e86\u89e3\u6676\u4f53\u7ba1\u6574\u4f53\u7684\u5b9a\u4f4d\u53ca\u5404\u7c7b\u578b\u7684\u7279\u70b9\u3002<\/p>\n

\u57fa\u4e8e\u6240\u8981\u6c42\u7684\u89c4\u683c\u786e\u5b9a\\(I_C\\)<\/span>\u3001\\(\u03b2_{forced}\\)<\/span>\u3001\\(I_B\\)<\/span>\u3001\\(R_B\\)<\/span> \u7684\u6b65\u9aa4<\/h3>\n

\u6309\u4ee5\u4e0b6\u4e2a\u6b65\u9aa4\u8fdb\u884c\u8bbe\u8ba1\u3002<\/p>\n

    \n
  1. \u5b9a\u4e49\u8d1f\u8f7d\u4fa7\u6761\u4ef6\uff1a\u6839\u636e\u8d1f\u8f7d\u7535\u538b\\(V_S\\)<\/span>\u3001\u8d1f\u8f7d\u7535\u6d41\\(I_{LOAD}\\)<\/span>\u3001\u5360\u7a7a\u6bd4\uff08\u8fde\u7eed\u6216PWM\uff09\u4ee5\u53ca\u73af\u5883\u6e29\u5ea6\u8303\u56f4\uff0c\u786e\u5b9a\u6676\u4f53\u7ba1\u4e2d\u6d41\u8fc7\u7684\u96c6\u7535\u6781\u7535\u6d41IC\u7684\u76ee\u6807\u503c\uff08\u5728\u521d\u59cb\u8ba1\u7b97\u4e2d\u5047\u8bbe\\(I_C\\)<\/span> \u2252 c<\/span>\uff09\u3002
    \n\u8d1f\u8377\u4e3a\u7535\u673a\u7b49\u65f6\uff0c\u4e0d\u7528\u7a33\u6001\u7535\u6d41\uff0c\u800c\u662f\u7528\u542f\u52a8\/\u5835\u8f6c\u65f6\u7684\u6700\u5927\u7535\u6d41\u6765\u786e\u5b9a\\(I_{LOAD}\\)<\/span>\u3002\u4e0d\u4ec5\u8981\u786e\u8ba4\\(I_{C(max)}\\)<\/span>\u7684\u8fde\u7eed\u989d\u5b9a\u503c\uff0c\u8fd8\u9700\u786e\u8ba4\u8109\u51b2\u989d\u5b9a\u503c\u548c\u5b89\u5168\u5de5\u4f5c\u533a\uff08SOA\uff09\uff0c\u4ee5\u786e\u4fdd\u5373\u4f7f\u5728\u6700\u5927\u7535\u6d41\u6761\u4ef6\u4e0b\u4e5f\u4e0d\u4f1a\u53d1\u751f\u51fb\u7a7f\uff08\u635f\u574f\uff09\u3002<\/li>\n
  2. \u786e\u8ba4\u5019\u9009\u6676\u4f53\u7ba1\u7684\u6280\u672f\u89c4\u683c\u4e66\uff1a\u786e\u8ba4\u6700\u5927\u96c6\u7535\u6781\u7535\u6d41\\(I_{C(max)}\\)<\/span>\u3001\u76f4\u6d41\u7535\u6d41\u653e\u5927\u7cfb\u6570\\(h_{FE(min)}\\)<\/span>\u3001\\(V_{BE(on)}\\)<\/span>\u7684\u5178\u578b\u503c\u3001\\(V_{CE(sat)}\\)<\/span>\uff0c\u6765\u5224\u65ad\u8be5\u5668\u4ef6\u7ea7\u522b\u662f\u5426\u6ee1\u8db3\u8981\u6c42\u3002<\/li>\n
  3. \u6839\u636e\\(\u03b2_{forced}\\)<\/span>\u786e\u5b9a\u57fa\u6781\u7535\u6d41\\(I_B\\)<\/span>\u7684\u76ee\u6807\u503c\uff1a\u5e76\u975e\u5b8c\u5168\u4f9d\u8d56\\(h_{FE(min)}\\)<\/span>\uff0c\u800c\u662f\u8bbe\u5b9a\u5f3a\u5236\u7535\u6d41\u653e\u5927\u500d\u6570\\(\u03b2_{forced}\\)<\/span> = 10\u201320\uff0c\u5e76\u6839\u636e\\(\u03b2_{forced}\\)<\/span> = \\(I_C\\)<\/span> \/ \\(I_B\\)<\/span>\u8ba1\u7b97\\(I_B\\)<\/span>\uff08\u4f8b\u5982\uff1a\u5f53\\(I_C\\)<\/span> = 200 mA\u3001\\(\u03b2_{forced}\\)<\/span> = 10\u65f6\uff0c\\(I_B\\)<\/span> = 20 mA\uff09\u3002<\/li>\n
  4. \u5fae\u63a7\u5236\u5668\/PLC\u7684I\/O\u89c4\u683c\u6838\u5bf9\uff1a\u786e\u8ba4\u9ad8\u7535\u5e73\u7535\u538b\\(V_{IO}\\)\u548c\u6e90\u6781\/\u6f0f\u6781\u7535\u6d41\u4e0a\u9650\\(I_{O(max)}\\)<\/span>\uff0c\u5e76\u786e\u8ba4\\(I_B\\)<\/span>\u662f\u5426\u5728\u5355\u4e2a\u7aef\u53e3\u7684\u8303\u56f4\u5185\uff0c\u4ee5\u9a8c\u8bc1\u591a\u4e2a\u7aef\u53e3\u540c\u65f6\u4f7f\u7528\u65f6\u662f\u5426\u5728\u603b\u7535\u6d41\u9650\u5236\u8303\u56f4\u5185\u3002<\/li>\n
  5. \u8ba1\u7b97\u57fa\u6781\u7535\u963b\\(R_B\\)<\/span>\uff1a\u6839\u636e\u7535\u538b\u5dee\u8ba1\u7b97\\(R_B\\)<\/span> \u2252 (\\(V_{IO}\\)<\/span> \u2212 \\(V_{BE}\\)<\/span>) \/ \\(I_B\\)<\/span>\uff0c\u5e76\u5706\u6574\u4e3a\u6807\u51c6\u7535\u963b\u503c\uff08E24\u7cfb\u5217\uff09\u3002<\/li>\n
  6. \u786e\u5b9a\u5019\u9009\u5668\u4ef6\uff1a\u786e\u8ba4\u91c7\u7528\u8bbe\u8ba1\u7684\\(I_C\\)<\/span>\u3001\\(I_B\\)<\/span>\u3001\\(V_{CE(sat)}\\)<\/span>\u65f6\u635f\u8017\u662f\u5426\u5728\u5bb9\u8bb8\u8303\u56f4\u5185\uff0c\u4ee5\u53ca\\(I_{C(max)}\\)<\/span>\u548c\u5bb9\u8bb8\u635f\u8017\u662f\u5426\u6709\u8db3\u591f\u7684\u88d5\u91cf\u3002<\/li>\n<\/ol>\n

    \u6309\u7167\u8fd96\u4e2a\u6b65\u9aa4\uff0c\u4ece\u8d1f\u8f7d\u6761\u4ef6\u51fa\u53d1\uff0c\u9010\u6b65\u786e\u5b9a\u6240\u9700\u7684\u5668\u4ef6\u548c\u5e38\u6570\u3002\u5404\u6b65\u9aa4\u7684\u8ba1\u7b97\u793a\u4f8b\u4f1a\u5728\u540e\u7eed\u7ae0\u8282\u4e2d\u7ed9\u51fa\u3002\u4ea7\u54c1\u786e\u5b9a\u540e\uff0c\u5c06\u8fdb\u5165\u9971\u5ea6\u786e\u8ba4\u9636\u6bb5\u3002<\/p>\n

    \"\u4f4e\u8fb9\u5f00\u5173\u7684\u8bbe\u8ba1\u6d41\u7a0b\"<\/p>\n

    \u9971\u548c\u786e\u8ba4\u2192\u635f\u8017\u786e\u8ba4\u2192\u4fdd\u62a4\u2192\u9a8c\u8bc1\u7684\u987a\u5e8f<\/h3>\n

    \\(R_B\\)<\/span> \u548c\u5668\u4ef6\u786e\u5b9a\u540e\uff0c\u6309\u4ee5\u4e0b4\u4e2a\u6b65\u9aa4\u786e\u8ba4\u8bbe\u8ba1\u7684\u5408\u7406\u6027\u3002<\/p>\n

    \u9971\u548c\u6761\u4ef6\u786e\u8ba4<\/strong>
    \n\u8ba1\u7b97\\(I_C\\)<\/span> \u548c\\(I_B\\)<\/span> \u4e4b\u6bd4\u3002\u786e\u8ba4\u5b83\u4eec\u7684\u6bd4\u503c\u5145\u5206\u5c0f\u4e8e\\(h_{FE(min)}\\)<\/span> \uff1a<\/p>\n

    \\(\\displaystyle\\frac{I_C}{I_B} < h_{FE}(min)\\)<\/span><\/p>\n

    \u4e0e\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u8bb0\u8f7d\u7684\\(V_{CE(sat)}\\)<\/span>\u6761\u4ef6\u8fdb\u884c\u6bd4\u8f83\uff0c\u786e\u8ba4\\(I_B\\)<\/span> \u662f\u5426\u4e0d\u8db3\u3002\u5982\u679c\u6bd4\u503c\u8fc7\u5927\uff0c\u539f\u672c\u5e94\u4f5c\u4e3a\u5f00\u5173\u5b9e\u73b0\u9971\u548c\u7684\u6676\u4f53\u7ba1\u5c06\u65e0\u6cd5\u6309\u7167\u9884\u671f\u8fbe\u5230\u9971\u548c\uff0c\u53cd\u800c\u8fdb\u5165\\(V_{CE}\\)<\/span>\u65e0\u6cd5\u5145\u5206\u4e0b\u964d\u7684\u653e\u5927\u533a\uff0c\u5bfc\u81f4\u635f\u8017\u589e\u52a0\uff0c\u751a\u81f3\u53ef\u80fd\u635f\u574f\u5668\u4ef6\u3002\u589e\u52a0\\(I_B\\)<\/span>\u5e76\u51cf\u5c0f\u6bd4\u503c\uff0c\u6216\u9009\u62e9\\(h_{FE(min)}\\)<\/span>\u8f83\u9ad8\u7684\u5668\u4ef6\u3002<\/p>\n

    \u635f\u8017\u548c\u53d1\u70ed\u786e\u8ba4<\/strong>
    \n\u4f7f\u7528\\(V_{CE(sat)}\\)<\/span>\u3001\\(I_C\\)<\/span>\u3001\u5360\u7a7a\u6bd4Duty\u8ba1\u7b97\u9971\u548c\u65f6\u7684\u635f\u8017\uff1a<\/p>\n

    \\(P\u2248V_{CE}(sat)\\times I_C\\times Duty\\)<\/span><\/p>\n

    \u5c06\u6b64\u503c\u4e0e\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u7684\u5bb9\u8bb8\u635f\u8017\u8fdb\u884c\u6bd4\u8f83\u3002\u82e5\u5728\u5bb9\u8bb8\u635f\u8017\u768450%\u4ee5\u4e0b\uff0c\u5219\u5177\u6709\u5145\u5206\u7684\u4f59\u91cf\u3002\u82e5\u8d85\u8fc780%\uff0c\u5219\u5e94\u63a2\u8ba8\u5c06\u5668\u4ef6\u5347\u6863\u6216\u66f4\u6362\u4e3aMOSFET\u3002\u53e6\u5916\u8fd8\u9700\u786e\u8ba4\u70ed\u963b\u4e0e\u73af\u5883\u6e29\u5ea6\u7684\u517c\u5bb9\u6027\u3002<\/p>\n

    \u611f\u6027\u8d1f\u8f7d\u4fdd\u62a4\u786e\u8ba4<\/strong>
    \n\u786e\u8ba4\u7eed\u6d41\u4e8c\u6781\u7ba1\u7684\u5b89\u88c5\u65b9\u5411\u662f\u5426\u6b63\u786e\uff08\u9634\u6781\u671d\u5411\u7535\u6e90\u4fa7\uff0c\u9633\u6781\u671d\u5411\u6676\u4f53\u7ba1\u4fa7\uff09\uff0c\u4ee5\u53ca\u989d\u5b9a\u503c\u662f\u5426\u6ee1\u8db3\u8981\u6c42\uff08\\(I_F\\)<\/span> \u2265 \\(I_{LOAD}\\)<\/span>\u3001\\(V_R\\)<\/span> \u2265 \\(V_S\\)<\/span>\uff09\u3002\u5728\u6709\u91ca\u653e\u65f6\u95f4\u548c\u566a\u58f0\u8981\u6c42\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u8003\u8651\u4e32\u8054\u6dfb\u52a0\u9f50\u7eb3\u4e8c\u6781\u7ba1\u6216\u6dfb\u52a0RC\u7f13\u51b2\u7535\u8def\u3002\u53e6\u5916\u8fd8\u8981\u786e\u8ba4\u4e8c\u6781\u7ba1\u7684\u635f\u8017\u5728\u989d\u5b9a\u8303\u56f4\u5185\u3002<\/p>\n

    \u5fc5\u8981\u6700\u5c0f\u7a0b\u5ea6\u7684\u5b9e\u9645\u88c5\u673a\u9a8c\u8bc1<\/strong>
    \n\u4f7f\u7528\u4e07\u7528\u8868\uff08DMM\uff09\u6d4b\u91cf\u4e09\u4e2a\u53c2\u6570\uff1a\\(V_{BE}\\)<\/span>\uff080.6\uff5e0.9 V\u7684\u8303\u56f4\u8868\u793a\u504f\u7f6e\u9002\u5f53\uff09\u3001\\(I_C\\)<\/span>\uff08\u4e0e\u8bbe\u8ba1\u503c\u7684\u4e00\u81f4\u6027\uff0c\u7528\u4e8e\u786e\u8ba4\u9971\u548c\u72b6\u6001\uff09\u3001\\(V_{CE}\\)<\/span>\uff08\u5b9e\u6d4b\u5bfc\u901a\u65f6\u7684\\(V_{CE(sat)}\\)<\/span>\uff0c\u786e\u8ba4\u5176\u4e0e\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u7684\\(V_{CE(sat)}\\)<\/span>\u6761\u4ef6\u548c\u503c\u662f\u5426\u76f8\u5f53\u3002\u901a\u5e38\u4ee5\u6570\u767emV\u4e3a\u53c2\u8003\u57fa\u51c6\uff0c\u4f46\u5177\u4f53\u4f1a\u56e0\u5668\u4ef6\u3001\u7535\u6d41\u3001\\(I_B\\)<\/span>\u6761\u4ef6\u800c\u5f02\uff09\u3002\u5982\u679c\u6709\u793a\u6ce2\u5668\uff0c\u53ef\u4ee5\u89c2\u6d4b\u5173\u65ad\u65f6\u7684\u6ce2\u5f62\uff0c\u5e76\u901a\u8fc7\u76ee\u89c6\u786e\u8ba4\u4e8c\u6781\u7ba1\u7684\u94b3\u4f4d\u52a8\u4f5c\u3002<\/p>\n

    \u901a\u8fc7\u4f9d\u6b21\u786e\u8ba4\u8fd94\u4e2a\u9879\u76ee\uff0c\u53ef\u4ee5\u9010\u6b65\u786e\u8ba4\u8bbe\u8ba1\u7684\u5408\u7406\u6027\u3002\u4e0b\u4e00\u8282\u5c06\u4ecb\u7ecd\u57fa\u6781\u7535\u963b\u7684\u8ba1\u7b97\u793a\u4f8b\u3002<\/p>\n

    \"\u4f4e\u8fb9\u5f00\u5173\u8bbe\u8ba1\u5408\u7406\u6027\u786e\u8ba4\u6d41\u7a0b\"<\/p>\n

    \u4f4e\u8fb9\u5f00\u5173\u7535\u8def\u4e2d\u57fa\u6781\u7535\u963b\\(R_B\\)<\/span> \u7684\u786e\u5b9a\u65b9\u6cd5\uff08NPN\u6676\u4f53\u7ba1\u7684\u57fa\u6781\u9a71\u52a8\uff09<\/h2>\n

    \u57fa\u6781\u7535\u963b\u7684\u503c\u9700\u540c\u65f6\u6ee1\u8db3\u4f7f\u6676\u4f53\u7ba1\u9971\u548c\u6240\u9700\u7684\u57fa\u6781\u7535\u6d41\u548cGPIO\u7684\u7535\u6d41\u4e0a\u9650\u8981\u6c42\u3002\u5f3a\u5236\u03b2\u503c\u7684\u8bbe\u5b9a\u51b3\u5b9a\u7740\u8bbe\u8ba1\u7684\u6210\u8d25\u3002
    \n\\(\u03b2_{forced}\\)<\/span> = 10\u201320\u4e0eGPIO\u7535\u6d41\u4e0a\u9650\u7684\u6838\u5bf9<\/strong>
    \n\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u8bb0\u8f7d\u7684\\(h_{FE(min)}\\)<\/span>\u662f\u7279\u5b9a\u6d4b\u8bd5\u6761\u4ef6\u4e0b\u7684\u6700\u5c0f\u503c\u3002\u8be5\u503c\u4f1a\u56e0\u6e29\u5ea6\u53ca\u4e2a\u4f53\u5dee\u5f02\u800c\u6ce2\u52a8\uff0c\u56e0\u6b64\u5b8c\u5168\u4f9d\u8d56\u8be5\u503c\u7684\u8bbe\u8ba1\u7f3a\u4e4f\u5b89\u5168\u88d5\u5ea6\u3002<\/p>\n

    \u5728\u5f00\u5173\u5e94\u7528\u4e2d\uff0c\u4f1a\u7279\u610f\u8bbe\u7f6e\u8f83\u5c0f\u7684\u7535\u6d41\u653e\u5927\u7cfb\u6570\uff1a<\/p>\n

    \\(\u03b2_{forced}=\\displaystyle\\frac{I_C}{I_B}\\)<\/span><\/p>\n

    \u4f8b\u5982\uff0c\u5f53\\(I_C\\)<\/span> = 200 mA\u65f6\uff0c\u6539\u53d8\\(\u03b2_{forced}\\)<\/span>\u5c06\u5f97\u5230\u5982\u4e0b\u7ed3\u679c\uff1a<\/p>\n\n\n\n\n\n\n\n
    \\(\u03b2_{forced}\\)<\/span><\/th>\n\\(I_B\\)<\/span><\/th>\n<\/tr>\n<\/thead>\n
    10<\/td>\n20 mA<\/td>\n<\/tr>\n
    15<\/td>\n13.3 mA<\/td>\n<\/tr>\n
    20<\/td>\n10 mA<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \\(\u03b2_{forced}\\)<\/span>\u8d8a\u5c0f\uff0c\\(I_B\\)<\/span>\u8d8a\u589e\u52a0\uff0c\u5c31\u8d8a\u5bb9\u6613\u9971\u548c\u3002\u4f46\u662f\uff0c\u5982\u679c\\(I_B\\)<\/span>\u589e\u52a0\u8fc7\u591a\uff0c\u53ef\u80fd\u4f1a\u8d85\u51fa\u5fae\u63a7\u5236\u5668\u548cPLC\u7684I\/O\u7535\u6d41\u4e0a\u9650\uff0c\u6240\u4ee5\u9700\u8981\u5728\u53ef\u9760\u6027\u548cI\/O\u5bb9\u91cf\u4e4b\u95f4\u53d6\u5f97\u5e73\u8861\u3002<\/p>\n

    \u5f53\\(I_B\\)<\/span>\u7684\u76ee\u6807\u503c\u786e\u5b9a\u540e\uff0c\u9700\u8981\u5bf9\u7167\u5fae\u63a7\u5236\u5668\u548cPLC\u7684\u89c4\u683c\uff0c\u786e\u8ba4\\(I_B\\)<\/span>\u662f\u5426\u8d85\u8fc7\u6bcf\u4e2aI\/O\u5f15\u811a\u7684\u5bb9\u8bb8\u7535\u6d41\u3002\u540c\u65f6\u8fd8\u9700\u8981\u9a8c\u8bc1\u591a\u4e2a\u5f15\u811a\u540c\u65f6\u4f7f\u7528\u65f6\u7684\u603b\u7535\u6d41\u9650\u5236\u3002\u4f8b\u5982\uff0c\u5f53\u8bbe\u8ba1\u7aef\u53e3\u4e0a\u9650\u4e3a20mA\u3001\\(I_B\\)<\/span> = 20 mA\u65f6\uff0c\u5c06\u51e0\u4e4e\u8fbe\u5230\u6781\u9650\u4f7f\u7528\u72b6\u6001\u3002\u5f53\u5176\u4ed6\u7aef\u53e3\u4e5f\u540c\u65f6\u5de5\u4f5c\u65f6\uff0c\u4e5f\u9700\u786e\u8ba4\u603b\u7535\u6d41\u7684\u9650\u5236\u3002\u5e94\u5728\\(\u03b2_{forced}\\)<\/span> = 10\u201320\u7684\u8303\u56f4\u5185\uff0c\u8003\u8651\u5230\u4e0eI\/O\u8d1f\u62c5\u4e4b\u95f4\u7684\u5e73\u8861\uff0c\u8c03\u6574\u4e3a\u5b9e\u9645\u53ef\u884c\u7684\u503c\u3002<\/p>\n

    \"\u4f4e\u8fb9\u5f00\u5173\u7535\u8def\u4e2d\u57fa\u6781\u7535\u963bRB\u7684\u786e\u5b9a\u65b9\u6cd5\"<\/p>\n

    \u4f7f\u75283.3V\/5V\u8f93\u51fa\u65f6\u7684\\(R_B\\)<\/span> \u8ba1\u7b97\u793a\u4f8b<\/h3>\n

    \u5f53\\(I_B\\)<\/span> \u786e\u5b9a\u540e\uff0c\\(R_B\\)<\/span> \u7684\u8ba1\u7b97\u672c\u8eab\u5373\u53ef\u901a\u8fc7\u4e0b\u5217\u516c\u5f0f\u6c42\u5f97\uff1a<\/p>\n

    \\(R_B\u2248\\displaystyle\\frac{(V_{IO}\u2212V_{BE})}{I_B}\\)<\/span><\/p>\n

    \u5176\u4e2d\uff0c\\(V_{IO}\\)<\/span>\u4e3aGPIO\u7684\u8f93\u51fa\u7535\u538b\u3002\u4f46\u662f\uff0c\u5b9e\u9645\u7684I\/O\u8f93\u51fa\u7535\u538b\u4f1a\u968f\u8f93\u51fa\u7535\u6d41\uff08\u6e90\u7535\u6d41\uff09\u7684\u589e\u52a0\u800c\u964d\u4f4e\u3002\u56e0\u6b64\uff0c\u4e3a\u786e\u4fdd\u5b89\u5168\uff0c\u5efa\u8bae\\(V_{IO}\\)<\/span>\u91c7\u7528\u6280\u672f\u89c4\u683c\u4e66\u4e2d\\(V_{OH(min)}\\)<\/span>\uff08\u89c4\u5b9a\u7684IOH\u6761\u4ef6\u4e0b\uff09\u7684\u503c\uff0c\u800c\u975e\\(V_{CC}\\)<\/span>\u7684\u5178\u578b\u503c\u3002\u53e6\u5916\uff0c\\(V_{BE}\\)<\/span>\u4e0d\u4ec5\u8981\u8003\u86510.7V\u7684\u5178\u578b\u503c\uff0c\u8fd8\u9700\u7ed3\u5408\\(V_{BE(sat)}\\)<\/span>\u548c\u6e29\u5ea6\u6ce2\u52a8\uff0c\u901a\u8fc7\u539f\u578b\u5b9e\u6d4b\u6765\u8fdb\u884c\u8c03\u6574\u3002<\/p>\n

    \u5c06\u8ba1\u7b97\u7ed3\u679c\u5706\u6574\u4e3a\u6807\u51c6\u7535\u963b\u503c\u3002\u5b9e\u9645\u53ef\u7528\u7684\u7535\u963b\u503c\uff0c\u4ec5\u9650E12\u7cfb\u5217\uff0810%\u7cbe\u5ea6\uff09\u548cE24\u7cfb\u5217\uff085%\u7cbe\u5ea6\uff09\u7b49\u6807\u51c6\u7cfb\u5217\u3002E24\u7cfb\u5217\u7684\u963b\u503c\u5212\u5206\u66f4\u7ec6\u81f4\uff0c\u4f8b\u59821.0k\u03a9\u30011.1k\u03a9\u30011.2k\u03a9\u7b49\uff0c\u56e0\u6b64\u66f4\u5bb9\u6613\u9009\u5230\u4e0e\u8ba1\u7b97\u6240\u5f97\u7684RB<\/sub>\u503c\u63a5\u8fd1\u7684\u963b\u503c\u3002<\/p>\n

    \u4f8b1\uff1a\u75285V\u5fae\u63a7\u5236\u5668\u9a71\u52a8200mA\u7ee7\u7535\u5668<\/strong>
    \n\u4f7f\u7528\u8bbe\u8ba1\u793a\u4f8b\u2460\u7684\u6761\u4ef6\u3002<\/p>\n\n\n\n\n\n\n\n\n\n
    \u9879\u76ee<\/th>\n\u503c<\/th>\n<\/tr>\n<\/thead>\n
    \\(V_{IO}\\)<\/span><\/td>\n5.0 V<\/td>\n<\/tr>\n
    \\(I_C\\)<\/span><\/td>\n200 mA<\/td>\n<\/tr>\n
    \\(\u03b2_{forced}\\)<\/span><\/td>\n10<\/td>\n<\/tr>\n
    \\(I_B\\)<\/span><\/td>\n20 mA<\/td>\n<\/tr>\n
    \\(V_{BE(on)}\\)<\/span><\/td>\n0.7 V<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u8ba1\u7b97\\(R_B\\)<\/span> \uff1a<\/p>\n

    \\(R_B\u2248\\displaystyle\\frac{(5.0\u22120.7)}{0.02}=215\u03a9\\)<\/span><\/p>\n

    E24\u7cfb\u5217\u4e2d\u6700\u63a5\u8fd1\u7684\u503c\u4e3a220\u03a9\u3002\u4f7f\u7528\u8be5\u503c\u91cd\u65b0\u8ba1\u7b97\\(I_B\\)<\/span> \uff1a<\/p>\n

    \\(I_B=\\displaystyle\\frac{(5.0\u22120.7)}{220}\u224819.5 mA \\)<\/span><\/p>\n

    \u4e0e\u76ee\u6807\u503c20mA\u57fa\u672c\u4e00\u81f4\u3002\u5982\u679cI\/O\u5f15\u811a\u7684\u4e0a\u9650\u572820mA\u5de6\u53f3\uff0c\u5219\u6210\u7acb\u3002\u8fd8\u5e94\u786e\u8ba4\u5305\u542b\u5176\u4ed6\u7aef\u53e3\u5728\u5185\u7684\u603b\u7535\u6d41\u4f59\u91cf\u3002\u540c\u65f6\u5e94\u786e\u8ba4\u6ca1\u6709\u4f7f\u7528\u5927\u7535\u6d41\u7684\u7aef\u53e3\uff0c\u786e\u4fdd\u4e0d\u8d85\u8fc7\u63a7\u5236\u5668\u603b\u7535\u6d41\u7684\u4e0a\u9650\u3002<\/p>\n

    \u4f8b2\uff1a\u75283.3V\u5fae\u63a7\u5236\u5668\u9a71\u52a870mA\u7535\u78c1\u9600<\/strong>
    \n\u91c7\u7528\u8bbe\u8ba1\u793a\u4f8b\u2461\u7684\u6761\u4ef6\u3002<\/p>\n\n\n\n\n\n\n\n\n\n
    \u9879\u76ee<\/th>\n\u503c<\/th>\n<\/tr>\n<\/thead>\n
    \\(V_{IO}\\)<\/span><\/td>\n3.3 V<\/td>\n<\/tr>\n
    \\(I_C\\)<\/span><\/td>\n70 mA<\/td>\n<\/tr>\n
    \\(\u03b2_{forced}\\)<\/span><\/td>\n10<\/td>\n<\/tr>\n
    \\(I_B\\)<\/span><\/td>\n7 mA<\/td>\n<\/tr>\n
    \\(V_{BE(on)}\\)<\/span><\/td>\n0.7 V<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u8ba1\u7b97\\(R_B\\)<\/span> \uff1a<\/p>\n

    \\(R_B\u2248\\displaystyle\\frac{(3.3\u22120.7)}{0.007}=371\u03a9\\)<\/span><\/p>\n

    \u5728E24\u7cfb\u5217\u4e2d\uff0c360\u03a9\u6216390\u03a9\u4e3a\u5019\u9009\u503c\u3002\u5206\u522b\u91cd\u65b0\u8ba1\u7b97\\(I_B\\)<\/span> \uff1a
    \n360 \u03a9 \u65f6\uff1a\\(I_B\\)<\/span> = (3.3 \u2013 0.7) \/ 360 \u2252 7.2 mA
    \n390 \u03a9 \u65f6\uff1a\\(I_B\\)<\/span> = (3.3 \u2013 0.7) \/ 390 \u2252 6.7 mA<\/p>\n

    \"\u8ba1\u7b97\u4f4e\u8fb9\u5f00\u5173\u7535\u8def\u4e2d\u57fa\u6781\u7535\u963b\u7684\u6d41\u7a0b\"<\/p>\n

    \u5982\u679cI\/O\u5f15\u811a\u7684\u7535\u6d41\u4e0a\u9650\u57288\u201310mA\u5de6\u53f3\uff0c\u5219\u4e24\u4e2a\u6570\u503c\u90fd\u6709\u8db3\u591f\u7684\u88d5\u91cf\u3002\u5982\u679c\u4e0a\u9650\u88ab\u9650\u5236\u57284\u20135mA\uff0c\u5219\u5355\u9760NPN\u9a71\u52a8\u8f83\u96be\u3002\u5728\u8fd9\u79cd\u9650\u5236\u4e0b\uff0c\u53ef\u63a2\u8ba8\u6676\u4f53\u7ba1\u9635\u5217\u6216\u5176\u4ed6\u9a71\u52a8\u7535\u8def\u7ed3\u6784\u3002<\/p>\n

    \u8fd8\u9700\u786e\u8ba4\u57fa\u6781\u7535\u963b\\(R_B\\)<\/span>\u7684\u989d\u5b9a\u529f\u7387\u3002\\(R_B\\)<\/span>\u6d88\u8017\u7684\u529f\u7387\u53ef\u6839\u636e\\(P_{RB}\\)<\/span> \u2248 (\\((V_{IO}\\)<\/span> \u2013 \\(V_{BE})^2\\)<\/span> \/ \\(R_B\\)<\/span>\uff08= \\(I_{B^2}\\)<\/span> \u00d7 \\(R_B\\)<\/span>\uff09\u8fdb\u884c\u4f30\u7b97\u3002\u4f8b\u5982\uff0c\u5728\u4f8b1\uff08\\(V_{IO}\\)<\/span> = 5.0 V\u3001\\(V_{BE}\\)<\/span> = 0.7 V\u3001\\(R_B\\)<\/span> = 220 \u03a9\uff09\u4e2d\uff0c\\(V_{IO}\\)<\/span> \u2013 \\(V_{BE}\\)<\/span> = 4.3 V\u3001(4.3 V) 2 = 18.49\u300118.49 \/ 220 \u2248 0.084 W\uff08\u7ea684 mW\uff09\u3002\u9009\u62e91\/8W\uff080.125W\uff09\u4ee5\u4e0a\u7684\u4ea7\u54c1\uff0c\u53ef\u83b7\u5f97\u8f83\u597d\u7684\u6e29\u5ea6\u88d5\u91cf\u3002<\/p>\n

    \u76f8\u6bd4\u4e8e\u4ec5\u7528\u5178\u578b\u503c\u4e00\u6b21\u6027\u7b97\u51fa\\(R_B\\)<\/span> \uff0c\u901a\u8fc7\u201c\u5728\u6700\u574f\u6761\u4ef6\u4e0b\u4ecd\u80fd\u6210\u7acb\u201d\u8fd9\u4e00\u539f\u5219\uff0c\u4ece\u4e0a\u9650\u3001\u4e0b\u9650\u8fdb\u884c\u9a8c\u8bc1\u6765\u786e\u5b9aRB\uff0c\u5176\u8bbe\u8ba1\u4f9d\u636e\u5c06\u66f4\u52a0\u660e\u786e\u3002\u5173\u952e\u5728\u4e8e\u8981\u540c\u65f6\u786e\u8ba4(1) \u57fa\u6781\u7535\u6d41\u4e0d\u4f1a\u4e0d\u8db3\uff08\uff1d\u6700\u5c0f\\(I_B\\)<\/span>\uff09\u548c(2)\u4e0d\u8d85\u51faI\/O\u9650\u5236\uff08\uff1d\u6700\u5927\\(I_B\\)<\/span>\uff09\u3002\u52a0\u5165\u8fd9\u79cd\u201c\u4e0a\u4e0b\u9650\u68c0\u67e5\u201d\uff0c\u5373\u4f7f\u5728\u5b58\u5728\u7535\u963b\u516c\u5dee\u3001\u6e29\u5ea6\u3001I\/O\u4e2a\u4f53\u5dee\u5f02\u7684\u91cf\u4ea7\u6761\u4ef6\u4e0b\uff0c\u4e5f\u80fd\u66f4\u597d\u5730\u8bf4\u660e\u201c\u4e3a\u4f55\u8bbe\u5b9a\u4e3a\u8be5\u503c\u201d\u3002<\/p>\n

    \u57fa\u6781\u4e32\u8054\u7535\u963b\u548cGND\u56de\u8def\u5e03\u7ebf\u7684\u6ce8\u610f\u4e8b\u9879<\/h3>\n

    \\(R_B\\)<\/span> \u7684\u503c\u786e\u5b9a\u540e\uff0c\u8fd8\u9700\u8003\u91cf\u7535\u8def\u4e0a\u7684\u5e03\u5c40\u548c\u5e03\u7ebf\u3002\u5373\u4f7f\u8ba1\u7b97\u6b63\u786e\uff0c\u82e5\u5e03\u5c40\u548c\u5e03\u7ebf\u4e0d\u5408\u7406\uff0c\u4e5f\u65e0\u6cd5\u6309\u8bbe\u8ba1\u9884\u671f\u5de5\u4f5c\u3002<\/p>\n

    \u57fa\u6781\u4e32\u8054\u7535\u963b\u5fc5\u987b\u63d2\u5165I\/O\u5f15\u811a\u4e0e\u57fa\u6781\u5f15\u811a\u4e4b\u95f4\u3002\u5982\u679c\u672a\u63d2\u5165\u7535\u963b\uff0c\u57fa\u6781\u7535\u6d41\u5c06\u4e0d\u53d7\u9650\uff0c\u53ef\u80fd\u5bfc\u81f4I\/O\u5f15\u811a\u548c\u6676\u4f53\u7ba1\u635f\u574f\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5982\u679c\u8bef\u5c06\u7535\u963b\u63a5\u5165\u53d1\u5c04\u6781\u4fa7\uff0c\u4f1a\u5bfc\u81f4\u53d1\u5c04\u6781\u7535\u4f4d\u4e0a\u5347\uff0c\\(V_{BE}\\)<\/span> \u4e0b\u964d\uff0c\u4ece\u800c\u9020\u6210\u6676\u4f53\u7ba1\u65e0\u6cd5\u5145\u5206\u5bfc\u901a\u3002\u5728\u7535\u8def\u901a\u7535\u524d\uff0c\u52a1\u5fc5\u786e\u8ba4\u7535\u963b\u7684\u4f4d\u7f6e\u3002<\/p>\n

    \u53d1\u5c04\u6781\u4e0eGND\u4e4b\u95f4\u7684\u5e03\u7ebf\u8981\u5c3d\u53ef\u80fd\u77ed\u3002\u57fa\u6781\u5468\u56f4\u7684\u5e03\u7ebf\u5e94\u8fd4\u56de\u81f3\u566a\u58f0\u5c11\u4e14\u5e72\u51c0\u7684GND\u3002\u5728\u53d1\u5c04\u6781\u4e0eGND\u4e4b\u95f4\u6709\u7535\u963b\u6216\u7535\u611f\u65f6\uff0c\u4f1a\u5bfc\u81f4\u53d1\u5c04\u6781\u7535\u4f4d\u6d6e\u52a8\uff0c\u4ece\u800c\u4f7f\\(V_{BE}\\)<\/span>\u4f4e\u4e8e\u8bbe\u8ba1\u503c\u3002\u5c24\u5176\u662f\u5904\u7406\u5927\u7535\u6d41\u65f6\uff0c\u9700\u6ce8\u610f\u5e03\u7ebf\u963b\u6297\u5bf9\\(V_{CE}\\)<\/span>\u7684\u5f71\u54cd\u3002\u5f53\u7535\u6d41\u8d85\u8fc7500mA\u65f6\uff0c\u5e94\u6d4b\u91cf\u5b9e\u9645\u7684\u5e03\u7ebf\u7535\u963b\u3002<\/p>\n

    \u5728\u590d\u4f4d\u548c\u542f\u52a8\u65f6\uff0c\u5982\u679cGPIO\u5904\u4e8e\u9ad8\u963b\u6297\u72b6\u6001\uff0c\u57fa\u6781\u5c06\u4f1a\u60ac\u7a7a\uff0c\u53ef\u80fd\u4f7f\u6676\u4f53\u7ba1\u5904\u4e8e\u4e0d\u7a33\u5b9a\u72b6\u6001\u3002\u4e3a\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u5e94\u6839\u636e\u9700\u8981\u5728\u57fa\u6781\u4e0eGND\u4e4b\u95f4\u6dfb\u52a0\u4e0b\u62c9\u7535\u963b\u3002\u7535\u963b\u503c\u7684\u9009\u62e9\u5e94\u4ee5\u6570\u5341k\u03a9\u5de6\u53f3\u4e3a\u8d77\u70b9\uff0c\u9009\u62e9\u6bd4\\(R_B\\)<\/span>\u8db3\u591f\u5927\u7684\u503c\u3002\u901a\u8fc7\u8fd9\u4e2a\u7535\u963b\uff0c\u4f7f\u5fae\u63a7\u5236\u5668\u5373\u4f7f\u5728\u5c1a\u672a\u5b8c\u6210\u521d\u59cb\u5316\u7684\u671f\u95f4\uff0c\u4e5f\u80fd\u786e\u4fdd\u6676\u4f53\u7ba1\u5207\u5b9e\u4fdd\u6301\u5173\u65ad\u72b6\u6001\u3002\u5c06\u4e0b\u62c9\u7535\u963b\u4e2d\u6d41\u8fc7\u7684\u7535\u6d41\u63a7\u5236\u5728\u8bbe\u8ba1\\(I_B\\)<\/span>\u76841%\u4ee5\u4e0b\uff0c\u4ee5\u8be5\u53c2\u8003\u6807\u51c6\u8fdb\u884c\u786e\u8ba4\u3002<\/p>\n

    \u5728\u4f4e\u8fb9\u5f00\u5173\u7535\u8def\u4e2d\u786e\u4fddNPN\u6676\u4f53\u7ba1\u5207\u5b9e\u9971\u548c\u7684\u8bbe\u8ba1\u8981\u70b9<\/h2>\n

    \u8981\u4f7f\u6676\u4f53\u7ba1\u9971\u548c\uff0c\u9700\u901a\u8fc7\u6280\u672f\u89c4\u683c\u4e66\u786e\u8ba4\\(V_{BE}\\)<\/span> \u548c\\(V_{CE(sat)}\\)<\/span>\u7684\u5b9e\u6d4b\u503c\uff0c\u5e76\u4e3a\u57fa\u6781\u7535\u6d41\u7559\u51fa\u88d5\u91cf\u3002\u8fdb\u5165\u653e\u5927\u533a\u4f1a\u5bfc\u81f4\u635f\u8017\u589e\u52a0\uff0c\u751a\u81f3\u53ef\u80fd\u635f\u574f\u5668\u4ef6\u3002<\/p>\n

    \\(V_{BE}\\)<\/span> \u548c\\(V_{CE(sat)}\\)<\/span>\u7684\u53c2\u8003\u503c\u4ee5\u53ca\u6280\u672f\u89c4\u683c\u4e66\u89e3\u8bfb\u65b9\u6cd5<\/h3>\n

    \u5728\u57fa\u6781\u7535\u963b\u7684\u8ba1\u7b97\u4e2d\uff0c\u8bbe\\(V_{BE(on)}\\)<\/span> = 0.7 V\u3002\u5b9e\u9645\u503c\u4f1a\u56e0\u5668\u4ef6\u548c\u7535\u6d41\u800c\u7565\u6709\u6ce2\u52a8\uff0c\u4f46\u591a\u6570NPN\u5bfc\u901a\u65f6\uff0c\u8be5\u503c\u90fd\u4f1a\u57280.6\u20130.8V\u7684\u8303\u56f4\u5185\u3002\u8bbe\u8ba1\u4e2d\u82e5\u9884\u4f300.7V\u5de6\u53f3\uff0c\u5219\u66f4\u5bb9\u6613\u786e\u4fdd\u51b3\u5b9a\\(\u03b2_{forced}\\)<\/span>\u65f6\u7684\u88d5\u91cf\u3002\u521d\u671f\u539f\u578b\u9a8c\u8bc1\u65f6\uff0c\u9700\u6d4b\u91cf\u5b9e\u9645\u7684\\(V_{BE}\\)<\/span>\u3002<\/p>\n

    \\(V_{CE(sat)}\\)<\/span>\u9971\u548c\u65f6\u7684\u96c6\u7535\u6781-\u53d1\u5c04\u6781\u95f4\u7535\u538b\u3002\u5728\u5c0f\u4fe1\u53f7\u6676\u4f53\u7ba1\u4e2d\uff0c\u5728\u6570\u5341\u301c\u6570\u767emA\u7684\u6761\u4ef6\u4e0b\uff0c\u5178\u578b\u503c\u7ea6\u4e3a0.1\u20130.3V\u3002\u8be5\u503c\u8d8a\u5c0f\uff0c\u4f5c\u4e3a\u5f00\u5173\u4f7f\u7528\u65f6\u7684\u635f\u8017\u5c31\u8d8a\u4f4e\u3002\u5173\u4e8e\u96c6\u7535\u6781\u7535\u6d41\u5bf9\u5e94\u7684\\(V_{CE(sat)}\\)<\/span>\u53d8\u5316\uff0c\u53ef\u53c2\u9605\u6280\u672f\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u7684\u56fe\u8868\u3002<\/p>\n

    \u5728\u67e5\u770b\u6280\u672f\u89c4\u683c\u4e66\u65f6\uff0c\u9700\u786e\u8ba4\\(V_{CE(sat)}\\)<\/span>\u662f\u5728\u4ec0\u4e48\u6837\u7684\\(I_C\\)<\/span>\u548c\\(I_B\\)<\/span>\uff08\u6216\\(I_C\\)<\/span> \/ \\(I_B\\)<\/span>\uff09\u6761\u4ef6\u4e0b\u6d4b\u91cf\u7684\u3002\u4f8b\u5982\uff0c\u82e5\u8bb0\u8f7d\u4e3a\u201c\\(V_{CE(sat)}\\)<\/span> = 0.2 V (\\(I_C\\)<\/span> = 100 mA, \\(I_B\\)<\/span> = 10 mA)\u201d\uff0c\u5219\u5bf9\u5e94\\(I_C\\)<\/span> \/ \\(I_B\\)<\/span> = 10\u6761\u4ef6\u4e0b\u7684\u503c\u3002<\/p>\n\n\n\n\n\n\n
    \u53c2\u6570<\/th>\n\u5178\u578b\u503c<\/th>\n\u786e\u8ba4\u8981\u70b9<\/th>\n<\/tr>\n
    \\(V_{BE(on)}\\)<\/span><\/td>\n0.6\u20130.8 V<\/td>\n\u7528\u4e8e\u8ba1\u7b97\\(R_B\\)<\/span><\/td>\n<\/tr>\n
    \\(V_{CE(sat)}\\)<\/span><\/td>\n0.1\u20130.3 V<\/td>\n\u786e\u8ba4\u6d4b\u8bd5\u6761\u4ef6\uff08\\(I_C\\)<\/span> \u3001\\(I_B\\)<\/span>\uff09<\/td>\n<\/tr>\n
    \\(I_C\\)<\/span> \/ \\(I_B\\)<\/span><\/td>\n10\u201320<\/td>\n\u4e0e\u8bbe\u8ba1\u7684\\(\u03b2_{forced}\\)<\/span> \u8fdb\u884c\u6bd4\u8f83<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u8fd9\u4e09\u4e2a\u53c2\u6570\u51b3\u5b9a\u9971\u548c\u88d5\u91cf\u3002\u5728\u786e\u5b9a\u8bbe\u8ba1\u4e4b\u524d\u786e\u8ba4\u5b83\u4eec\u7684\u503c\u3002<\/p>\n

    \u4e0b\u9762\u7ed3\u5408\u5177\u4f53\u4f8b\u5b50\u6765\u8bf4\u660e\u3002\u5f53\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u8bb0\u8f7d\u201c\\(V_{CE(sat)}\\)<\/span> = 0.2 V (\\(I_C\\)<\/span> = 150 mA, \\(I_B\\)<\/span> = 15 mA)\u201d\uff0c\u8bbe\u8ba1\u6761\u4ef6\u4e3a\\(I_C\\)<\/span> = 200 mA\u3001\\(I_B\\)<\/span> = 20 mA\u65f6\uff0c\u8bbe\u8ba1\u7684\\(I_C\\)<\/span> \/ \\(I_B\\)<\/span> = 10\uff0c\u4e0e\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u7684\\(I_C\\)<\/span> \/ \\(I_B\\)<\/span>> = 10\u76f8\u540c\u3002\u6b64\u65f6\uff0c\\(V_{CE(sat)}\\)<\/span>\u9884\u8ba1\u5c06\u7b49\u4e8e\u6216\u7565\u5927\u4e8e\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u7684\u6807\u79f0\u503c\u3002<\/p>\n

    \u5982\u679c\u8bbe\u8ba1\u4e2d\u7684\\(I_C\\)<\/span> = 200 mA\u3001\\(I_B\\)<\/span> = 10 mA\uff0c\u5219\u8bbe\u8ba1\u7684\\(I_C\\)<\/span> \/ \\(I_B\\)<\/span> = 20\uff0c\u9ad8\u4e8e\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u7684\u6761\u4ef6\u8981\u6c42\u3002\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\\(V_{CE(sat)}\\)<\/span>\u53ef\u80fd\u4f1a\u9ad8\u4e8e0.2V\uff0c\u5bfc\u81f4\u9971\u548c\u4e0d\u5145\u5206\u3002\u8fd9\u9700\u8981\u91cd\u65b0\u5ba1\u89c6\u8bbe\u8ba1\uff0c\u589e\u52a0\\(I_B\\)<\/span>\uff0c\u6216\u5c06\\(\u03b2_{forced}\\)<\/span>\u91cd\u65b0\u8bbe\u7f6e\u4e3a\u66f4\u5c0f\u7684\u503c\u3002\u5728\u6d4b\u8bd5\u65f6\uff0c\u901a\u8fc7\u5b9e\u9645\u6d4b\u91cf\\(V_{CE}\\)<\/span>\u6765\u786e\u8ba4\u9971\u548c\u72b6\u6001\u3002<\/p>\n

    \u786e\u4fdd\u4e0d\u8fdb\u5165\u653e\u5927\u533a\u7684\u57fa\u6781\u7535\u6d41\u88d5\u91cf\u8bbe\u5b9a\u65b9\u6cd5<\/h3>\n

    \u5f53\u57fa\u6781\u7535\u6d41\u4e0d\u8db3\u65f6\uff0c\u6676\u4f53\u7ba1\u5c06\u5de5\u4f5c\u5728\u653e\u5927\u533a\uff0c\\(V_{CE}\\)<\/span>\u5c06\u4f1a\u589e\u5927\u3002\u5728\u9971\u548c\u533a\uff0c\\(V_{CE(sat)}\\)<\/span>\u7ea6\u4e3a0.2V\uff0c\u800c\u5728\u653e\u5927\u533a\u53ef\u80fd\u4f1a\u4e0a\u5347\u52301V\u4ee5\u4e0a\u3002\u5728\u8fd9\u79cd\u72b6\u6001\u4e0b\uff0c\u635f\u8017\u4f1a\u589e\u52a0\u52305\u500d\u4ee5\u4e0a\uff0c\u53ef\u80fd\u4f1a\u56e0\u53d1\u70ed\u5bfc\u81f4\u5668\u4ef6\u635f\u574f\u3002\u5f53\u6e29\u5347\u8f83\u5927\u65f6\uff08\u4f8b\u5982\u6570\u5341\u2103\u4ee5\u4e0a\uff0c\u6216\u63a5\u8fd1100\u2103\u65f6\uff09\uff0c\u4e0d\u4ec5\u8981\u5bf9\u653e\u5927\u533a\u5de5\u4f5c\u72b6\u6001\u8fdb\u884c\u91cd\u65b0\u8bc4\u4f30\uff0c\u8fd8\u9700\u5bf9\u635f\u8017\u548c\u6563\u70ed\u6761\u4ef6\u8fdb\u884c\u91cd\u65b0\u8bc4\u4f30\u3002\u9996\u5148\uff0c\u5b9e\u9645\u6d4b\u91cf\\(V_{CE(sat)}\\)<\/span>\u548c\\(I_C\\)<\/span>\uff0c\u5e76\u4e0e\u6280\u672f\u89c4\u683c\u4e66\u6761\u4ef6\u8fdb\u884c\u6838\u5bf9\u4ee5\u786e\u5b9a\u539f\u56e0\uff0c\u7136\u540e\u6839\u636e\u9700\u8981\u8c03\u6574\\(I_B\\)<\/span>\u3001\u63d0\u9ad8\u5668\u4ef6\u89c4\u683c\u7b49\u7ea7\u6216\u6539\u5584\u6563\u70ed\u60c5\u51b5\u3002<\/p>\n

    \u8981\u4f7f\u5176\u5de5\u4f5c\u5728\u9971\u548c\u533a\uff0c\u5c31\u9700\u8981\u786e\u4fdd\u8db3\u591f\u7684\\(I_B\\)<\/span>\u3002\u4f5c\u4e3a\u5f00\u5173\u4f7f\u7528\u65f6\uff0c\u539f\u5219\u4e0a\u6839\u636e\u8d1f\u8f7d\u786e\u5b9a\\(I_C\\)<\/span>\uff0c\u5e76\u5c06\\(I_B\\)<\/span>\u8bbe\u5b9a\u5f97\u8db3\u591f\u5927\u4e8e\u8be5\u503c\u3002\u4e0d\u76f4\u63a5\u4f7f\u7528\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u7684\\(h_{FE(min)}\\)<\/span>\u503c\uff0c\u800c\u662f\u6709\u610f\u8bbe\u7f6e\u8f83\u5c0f\u7684\\(\u03b2_{forced}\\)<\/span>\u503c\u3002<\/p>\n

    \u4e0b\u9762\u6574\u7406\u4e00\u4e0b\\(h_{FE(min)}\\)<\/span>\u4e0e\\(\u03b2_{forced}\\)<\/span>\u4e4b\u95f4\u7684\u5173\u7cfb\u3002<\/p>\n\n\n\n\n\n
    \\(h_{FE(min)}\\)<\/span><\/th>\n\\(\u03b2_{forced}\\)<\/span><\/th>\n\u88d5\u91cf<\/th>\n<\/tr>\n
    100 \u5de6\u53f3<\/td>\n10\u201320<\/td>\n\\(h_{FE}\\)<\/span> \u76841\/5\u301c1\/10<\/td>\n<\/tr>\n
    50 \u5de6\u53f3<\/td>\n8\u201310<\/td>\n\\(h_{FE}\\)<\/span> \u76841\/5\u301c1\/6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u901a\u8fc7\u8fd9\u6837\u7684\u8bbe\u7f6e\uff0c\u5373\u4f7f\u5728\u6e29\u5ea6\u6216\u4e2a\u4f53\u5dee\u5f02\u5bfc\u81f4\\(h_{FE}\\)<\/span>\u53d8\u5316\u65f6\uff0c\u4e5f\u80fd\u66f4\u5bb9\u6613\u7ef4\u6301\u9971\u548c\u533a\u3002\\(h_{FE}\\)<\/span>\u6709\u968f\u6e29\u5ea6\u5347\u9ad8\u800c\u4e0a\u5347\u7684\u8d8b\u52bf\uff0c\u4f46\u5728\u4f4e\u6e29\u65f6\\(h_{FE}\\)<\/span>\u4f1a\u4e0b\u964d\u3002\u5ba4\u6e29\u4e0b\\(h_{FE}\\)<\/span>=100\u7684\u6676\u4f53\u7ba1\uff0c\u5728\u4f4e\u6e29\u73af\u5883\u6216\u9ad8\u96c6\u7535\u6781\u7535\u6d41\u6761\u4ef6\u4e0b\uff0c\u5176\\(h_{FE}\\)<\/span>\u53ef\u80fd\u964d\u81f350\u5de6\u53f3\u3002\u8fd9\u5bf9\u4e8e\u8f66\u8f7d\u7528\u9014\u548c\u5de5\u4e1a\u8bbe\u5907\u7b49\u6e29\u5ea6\u6ce2\u52a8\u8f83\u5927\u7684\u4e25\u82db\u73af\u5883\u6765\u8bf4\u5c24\u4e3a\u91cd\u8981\u3002\\(\u03b2_{forced}\\)<\/span>= 10~20\u5de6\u53f3\u7684\u8bbe\u5b9a\uff0c\u662f\u8003\u8651\u5230\u8fd9\u79cd\u6ce2\u52a8\u6240\u9884\u7559\u7684\u88d5\u91cf\u3002<\/p>\n

    \u4f46\u82e5\u5c06\\(\u03b2_{forced}\\)<\/span>\u8bbe\u7f6e\u5f97\u8fc7\u5c0f\uff0c\u5219\\(I_B\\)<\/span>\u589e\u52a0\uff0c\u5e76\u4ea7\u751f\u526f\u4f5c\u7528\uff1a\u53ef\u80fd\u5f71\u54cd\u5fae\u63a7\u5236\u5668\u7684I\/O\u9650\u5236\uff0c\u6216\u4f7f\u57fa\u6781\u9a71\u52a8\u7684\u635f\u8017\u589e\u52a0\u3002\\(\u03b2_{forced}\\)<\/span> = 10~20\u5de6\u53f3\u662f\u517c\u987e\u9971\u548c\u53ef\u9760\u6027\u4e0eI\/O\u8d1f\u62c5\u4e4b\u95f4\u5e73\u8861\u7684\u8303\u56f4\u3002\u4e3a\u4e86\u6291\u5236\\(I_B\\)<\/span>\uff0c\u6709\u65f6\u4f1a\u60f3\u8c03\u9ad8\\(\u03b2_{forced}\\)<\/span>\uff0c\u4f46\\(\u03b2_{forced}\\)<\/span>\u63d0\u5347\u5f97\u8d8a\u9ad8\uff0c\u9971\u548c\u88d5\u91cf\u4f1a\u5c31\u4f1a\u8d8a\u5c11\u3002\u8bbe\u8ba1\u65f6\u5e94\u5148\u4ee5\\(\u03b2_{forced}\\)<\/span>= 10~20\u4e3a\u53c2\u8003\u6807\u51c6\uff0c\u5982\u679c\u56e0I\/O\u7535\u6d41\u7ea6\u675f\u4e0d\u5f97\u4e0d\u589e\u5927\\(\u03b2_{forced}\\)<\/span>\uff0c\u5219\u9700\u4ece\u6280\u672f\u89c4\u683c\u4e66\u6761\u4ef6\u548c\u5b9e\u6d4b\u4e24\u65b9\u9762\uff0c\u786e\u8ba4\u5728\u6700\u574f\u6e29\u5ea6\u548c\u6700\u5dee\u4e2a\u4f53\u60c5\u51b5\u4e0b\uff0c\\(V_{CE(sat)}\\)<\/span>\u548c\u53d1\u70ed\u91cf\u662f\u5426\u5728\u5bb9\u8bb8\u8303\u56f4\u5185\uff0c\u4ee5\u6b64\u5224\u65ad\u53ef\u884c\u6027\u3002\u5c06\u8bbe\u8ba1\u7684\\(I_C\\)<\/span> \/ \\(I_B\\)<\/span>\u4e0e\u6280\u672f\u89c4\u683c\u4e66\u7684\u6761\u4ef6\u8fdb\u884c\u6bd4\u8f83\uff0c\u786e\u8ba4\u8bbe\u8ba1\u503c\u8f83\u5c0f\u3002\u53ea\u8981\u6ee1\u8db3\u8be5\u6761\u4ef6\uff0c\u5373\u53ef\u6709\u6548\u964d\u4f4e\u843d\u5165\u653e\u5927\u533a\u7684\u98ce\u9669\u3002\u53ef\u5728\u521d\u671f\u539f\u578b\u9636\u6bb5\uff0c\u901a\u8fc7\u6781\u9650\u6e29\u5ea6\u6761\u4ef6\u8fdb\u884c\u6d4b\u8bd5\uff0c\u6765\u9a8c\u8bc1\u88d5\u91cf\u7684\u5408\u7406\u6027\u3002<\/p>\n

    \u4f4e\u8fb9\u5f00\u5173\u4e2d\u4fdd\u62a4\u7ee7\u7535\u5668\/\u7535\u78c1\u9600\u7684\u611f\u6027\u8d1f\u8f7d\u4fdd\u62a4\u7535\u8def<\/h2>\n

    \u611f\u6027\u8d1f\u8f7d\u5728\u6676\u4f53\u7ba1\u5173\u65ad\u65f6\u4f1a\u4ea7\u751f\u53cd\u7535\u52a8\u52bf\u3002\u901a\u8fc7\u7eed\u6d41\u4e8c\u6781\u7ba1\u521b\u5efa\u7535\u6d41\u8def\u5f84\uff0c\u4ece\u800c\u4fdd\u62a4\u5668\u4ef6\u3002\u7136\u800c\uff0c\u4ec5\u4f7f\u7528\u7eed\u6d41\u4e8c\u6781\u7ba1\u7684\u8bdd\uff0c\u7ebf\u5708\u7535\u6d41\u4f1a\u7f13\u6162\u8870\u51cf\uff0c\u5bfc\u81f4\u78c1\u529b\u4e0d\u6613\u6d88\u9664\uff0c\u4ece\u800c\u53ef\u80fd\u4f7f\u7ee7\u7535\u5668\/\u7535\u78c1\u9600\u7684\u65ad\u5f00\u52a8\u4f5c\uff08\u91ca\u653e\uff09\u53d8\u6162\u3002\u9700\u8981\u5feb\u901f\u91ca\u653e\u65f6\uff0c\u53ef\u91c7\u7528\u9f50\u7eb3\u4e8c\u6781\u7ba1\u6216RC\u7f13\u51b2\u7535\u8def\u6765\u5bf9\u5e94\u3002<\/p>\n

    \"\u4f4e\u8fb9\u5f00\u5173\u4e2d\u7684\u611f\u6027\u8d1f\u8f7d\u4fdd\u62a4\u7535\u8def\u6bd4\u8f83\"<\/p>\n

    \u7eed\u6d41\u4e8c\u6781\u7ba1\u7684\u65b9\u5411\u4e0e\u7535\u6d41\u3001\u7535\u538b\u989d\u5b9a\u503c<\/h3>\n

    \u5728\u7ee7\u7535\u5668\u548c\u7535\u78c1\u9600\u7b49\u611f\u6027\u8d1f\u8f7d\u4e2d\uff0c\u5f53\u6676\u4f53\u7ba1\u65ad\u5f00\u65f6\uff0c\u4e3a\u4fdd\u6301\u7ebf\u5708\u7535\u6d41\u4f1a\u4ea7\u751f\u9ad8\u7535\u538b\u3002\u5728\u67d0\u4e9b\u6761\u4ef6\u4e0b\uff0c\u53ef\u80fd\u4f1a\u8fbe\u5230\u6570\u5341V~100V\u4ee5\u4e0a\uff0c\u56e0\u6b64\u9700\u8981\u4f7f\u7528\u94b3\u4f4d\u7535\u8def\uff08\u5982\u7eed\u6d41\u4e8c\u6781\u7ba1\u7b49\uff09\u8fdb\u884c\u4fdd\u62a4\uff0c\u4ee5\u514d\u8d85\u51fa\u6676\u4f53\u7ba1\u7684 \\(V_{CEO}\\)<\/span>\uff08\u8010\u538b\u503c\uff09\u3002\u4e3a\u9632\u6b62\u56e0\u8d85\u8fc7\u6676\u4f53\u7ba1\u7684\u8010\u538b\u800c\u5bfc\u81f4\u5668\u4ef6\u635f\u574f\uff0c\u9700\u91c7\u7528\u7eed\u6d41\u4e8c\u6781\u7ba1\u8fdb\u884c\u4fdd\u62a4\u3002<\/p>\n

    \u7eed\u6d41\u4e8c\u6781\u7ba1\u5e94\u4e0e\u7ebf\u5708\u5e76\u8054\u8fde\u63a5\u3002\u901a\u8fc7\u56fe\u793a\u786e\u8ba4\u8fde\u63a5\u65b9\u6cd5\u3002<\/p>\n

    \u4e8c\u6781\u7ba1\u7684\u65b9\u5411\u4e3a\u9634\u6781\u671d\u5411\u7535\u6e90\u4fa7\uff08+V\uff09\uff0c\u9633\u6781\u671d\u5411\u6676\u4f53\u7ba1\u4fa7\uff08GND\u4fa7\uff09\u3002\u5728\u8fd9\u4e2a\u65b9\u5411\u4e0b\uff0c\u6676\u4f53\u7ba1\u5bfc\u901a\u65f6\u4e8c\u6781\u7ba1\u5904\u4e8e\u53cd\u5411\u504f\u7f6e\u72b6\u6001\uff0c\u56e0\u6b64\u4e0d\u4f1a\u6709\u7535\u6d41\u6d41\u8fc7\u3002\u5728\u5173\u65ad\u77ac\u95f4\uff0c\u7ebf\u5708\u7535\u6d41\u5f62\u6210\u4e00\u6761\u7ecf\u7531\u4e8c\u6781\u7ba1\u5faa\u73af\u7684\u8def\u5f84\uff0c\u4ece\u800c\u9632\u6b62\u6676\u4f53\u7ba1\u627f\u53d7\u8fc7\u5927\u7684\u7535\u538b\u3002\u5982\u679c\u65b9\u5411\u9519\u8bef\uff0c\u53ef\u80fd\u5bfc\u81f4\u7535\u6e90\u77ed\u8def\u6216\u65e0\u6cd5\u53d1\u6325\u4fdd\u62a4\u529f\u80fd\u3002\u710a\u63a5\u524d\u8bf7\u786e\u8ba4\u6781\u6027\u6807\u8bb0\u3002<\/p>\n

    \u5728\u4e8c\u6781\u7ba1\u7684\u9009\u578b\u4e2d\uff0c\u9700\u786e\u8ba4\u4e24\u4e2a\u989d\u5b9a\u503c\u3002<\/p>\n\n\n\n\n\n
    \u989d\u5b9a\u9879\u76ee<\/th>\n\u9009\u62e9\u6807\u51c6<\/th>\n\u4f8b<\/th>\n<\/tr>\n
    \u6b63\u5411\u7535\u6d41\\(I_F\\)<\/span><\/td>\n\u7ebf\u5708\u7535\u6d41\u2265\\(I_{LOAD}\\)<\/span><\/td>\n\\(I_{LOAD}\\)<\/span> = 200 mA \u2192 \\(I_F\\)<\/span> \u2265 200 mA<\/td>\n<\/tr>\n
    \u53cd\u5411\u7535\u538b\\(V_R\\)<\/span><\/td>\n\u8d85\u8fc7\u8d1f\u8f7d\u7535\u538b\\(V_S\\)<\/span>\u76843~5\u500d\uff08\u53c2\u8003\u503c\uff09<\/td>\n\\(V_S\\)<\/span> = 12 V \u2192 \\(V_R\\)<\/span> \u2265 50 V<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u6b63\u5411\u7535\u6d41\u989d\u5b9a\u503c\u9700\u8981\u5927\u4e8e\\(I_{LOAD}\\)<\/span>\uff0c\u56e0\u4e3a\u7ebf\u5708\u7535\u6d41\u4f1a\u77ac\u95f4\u6d41\u8fc7\u4e8c\u6781\u7ba1\u3002\u53cd\u5411\u7535\u538b\u989d\u5b9a\u503c\uff08\\(V_{RRM}\\)<\/span> \uff09\u9700\u8981\u81f3\u5c11\u8d85\u8fc7\u8d1f\u8f7d\u4f9b\u7535\u7535\u538b\u7684\u6700\u5927\u503c\\(V_{S(max)}\\)<\/span>\u3002\u53e6\u5916\uff0c\u5e94\u8003\u8651\u5230\u7535\u6e90\u7ebf\u8def\u7684\u6d6a\u6d8c\/\u5c16\u5cf0\u4ee5\u53ca\u5e03\u7ebf\u6761\u4ef6\uff0c\u5728\u9009\u62e9\u65f6\u7559\u6709\u8db3\u591f\u88d5\u91cf\uff083\uff5e5\u500d\u4ec5\u4e3a\u53c2\u8003\u6807\u51c6\u793a\u4f8b\uff09\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e12V\u9a71\u52a8\u7684\u7ee7\u7535\u5668\u800c\u8a00\uff0c\u5e94\u9009\u62e9\\(V_R\\)<\/span> = 50 V\u4ee5\u4e0a\u7684\u4e8c\u6781\u7ba1\u3002\u989d\u5b9a\u503c\u4e0d\u8db3\u7684\u4e8c\u6781\u7ba1\u4f1a\u5728\u611f\u6027\u53cd\u51b2\uff08Kickback\uff09\u65f6\u53d1\u751f\u6545\u969c\u3002<\/p>\n

    \u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528\u901a\u7528\u7684\u7845\u6574\u6d41\u4e8c\u6781\u7ba1\u5373\u53ef\u3002\u8096\u7279\u57fa\u4e8c\u6781\u7ba1\u7684\u6b63\u5411\u7535\u538b\u4f4e\u4e14\u51e0\u4e4e\u65e0\u53cd\u5411\u6062\u590d\uff0c\u800c\u5f88\u591a\u4ea7\u54c1\u7684\u53cd\u5411\u7535\u538b\u89c4\u683c\u503c\u8f83\u4f4e\uff0c\u5728\u8d1f\u8f7d\u7535\u538b\u8f83\u9ad8\u7684\u60c5\u51b5\u4e0b\uff0c\u9009\u578b\u65f6\u9700\u8981\u6ce8\u610f\u3002\u6b64\u5916\uff0c\u7eed\u6d41\u4e8c\u6781\u7ba1\u7684\u6b63\u5411\u7535\u538b\u964d\u4f4e\u4f1a\u5bfc\u81f4\u94b3\u4f4d\u7535\u538b\u4e5f\u4e0b\u964d\uff0c\u8fdb\u800c\u4f7f\u7ebf\u5708\u7535\u6d41\u8870\u51cf\u53d8\u6162\uff0c\u4ece\u800c\u4f7f\u91ca\u653e\u52a8\u4f5c\u8d8b\u4e8e\u5ef6\u8fdf\u3002\u5982\u679c\u5e0c\u671b\u7f29\u77ed\u91ca\u653e\u65f6\u95f4\uff0c\u4e0d\u662f\u66ff\u6362\u4e3a\u8096\u7279\u57fa\u4e8c\u6781\u7ba1\uff0c\u800c\u5e94\u8003\u8651\u91c7\u7528\u9f50\u7eb3\u4e32\u8054\u6216RC\u7f13\u51b2\u7535\u8def\u7b49\u8bbe\u8ba1\u94b3\u4f4d\u7535\u538b\u548c\u6ce2\u5f62\u7684\u65b9\u6cd5\u3002<\/p>\n

    \u5bf9\u8bbe\u8ba1\u793a\u4f8b\u2460\u4e2d\u76845V\u7ee7\u7535\u5668\uff08200mA\uff09\uff0c\u5e94\u9009\u62e9\\(I_F\\)<\/span>\uff08\u5e73\u5747\u503c\/\u8109\u51b2\uff09\u5747\u5207\u5b9e\u8d85\u8fc7\u7ebf\u5708\u7535\u6d41\u3001\u4e14\\(V_R\\)<\/span>\u7559\u6709\u88d5\u91cf\u7684\u4e8c\u6781\u7ba1\u3002\u4ece\u5b89\u88c5\u53ef\u9760\u6027\u548c\u6613\u4e8e\u83b7\u5f97\u6e29\u5ea6\u88d5\u5ea6\u7684\u89d2\u5ea6\u770b\uff0c\u9996\u5148\u5c061A\u7ea7\u6574\u6d41\u4e8c\u6781\u7ba1\u4f5c\u4e3a\u7b2c\u4e00\u5019\u9009\u8f83\u4e3a\u7a33\u59a5\uff08\u5728\u9ad8\u9891\u5f00\u5173\u5e94\u7528\u4e2d\u5219\u5e94\u8003\u8651\u4f7f\u7528\u9ad8\u901f\u6574\u6d41\u4e8c\u6781\u7ba1\uff09\u3002<\/p>\n

    \u5bf9\u4e8e\u8bbe\u8ba1\u793a\u4f8b\u2461\u4e2d\u768412V\u7535\u78c1\u9600\uff0870mA\uff09\u800c\u8a00\uff0c\u9009\u62e91A\u7ea7\u4ea7\u54c1\u4e0d\u4ec5\u6613\u4e8e\u91c7\u8d2d\uff0c\u800c\u4e14\u66f4\u5bb9\u6613\u786e\u4fdd\u989d\u5b9a\u88d5\u91cf\u3002\u65e0\u8bba\u9009\u62e9\u4ec0\u4e48\u6837\u7684\u4ea7\u54c1\uff0c\u90fd\u9700\u8981\u786e\u8ba4\u5728\u5de5\u4f5c\u8fc7\u7a0b\u4e2d\u7684\u7ed3\u6e29\u4fdd\u6301\u5728\u989d\u5b9a\u503c\u4ee5\u5185\uff08\u4f8b\u5982125\u2103\u4ee5\u4e0b\uff09\u3002<\/p>\n

    \u5f53\u9700\u8981\u9ad8\u901f\u91ca\u653e\u65f6\uff0c\u91c7\u7528\u9f50\u7eb3\u4e32\u8054\u6216RC\u7f13\u51b2\u7535\u8def<\/h3>\n

    \u7eed\u6d41\u4e8c\u6781\u7ba1\u867d\u7136\u80fd\u6709\u6548\u6291\u5236\u53cd\u7535\u52a8\u52bf\uff0c\u4f46\u4f1a\u5bfc\u81f4\u7ebf\u5708\u7535\u6d41\u7684\u8870\u51cf\u901f\u5ea6\u53d8\u6162\u3002\u5982\u679c\u662f\u7ee7\u7535\u5668\uff0c\u91ca\u653e\u65f6\u95f4\u4f1a\u5ef6\u957f\uff1b\u5982\u679c\u662f\u7535\u78c1\u9600\uff0c\u5219\u6062\u590d\u65f6\u95f4\u4f1a\u53d8\u957f\u3002\u5728\u5f00\/\u5173\u9ad8\u901f\u53cd\u590d\u5207\u6362\u7684\u5e94\u7528\u4e2d\uff0c\u8fd9\u79cd\u8870\u51cf\u65f6\u95f4\u53ef\u80fd\u4f1a\u6210\u4e3a\u5236\u7ea6\u56e0\u7d20\u3002\u5982\u679c\u5e0c\u671b\u52a0\u5feb\u91ca\u653e\u65f6\u95f4\uff0c\u53ef\u8003\u8651\u91c7\u7528\u9f50\u7eb3\u4e8c\u6781\u7ba1\u4e32\u8054\u6216RC\u7f13\u51b2\u7535\u8def\u3002\u5173\u4e8eRC\u7f13\u51b2\u7535\u8def\u7684\u4f5c\u7528\u53ca\u53c2\u6570\u786e\u5b9a\u65b9\u6cd5\uff0c\u5728\u201cRC\u7f13\u51b2\u7535\u8def\u201d\u4e00\u6587\u4e2d\u6709\u8be6\u7ec6\u4ecb\u7ecd\u3002<\/p>\n

    \u9f50\u7eb3\u4e8c\u6781\u7ba1\u4e32\u8054\u7684\u5e94\u7528<\/strong>
    \n\u5c06\u7eed\u6d41\u4e8c\u6781\u7ba1\u4e0e\u9f50\u7eb3\u4e8c\u6781\u7ba1\u4e32\u8054\u8fde\u63a5\u3002\u901a\u8fc7\u5c06\u9f50\u7eb3\u7535\u538b\\(V_Z\\)<\/span>\u8bbe\u5b9a\u4e3a\u9ad8\u4e8e\u8d1f\u8f7d\u7535\u538b\\(V_S\\)<\/span> \u7684\u503c\uff0c\u5bf9\u7ebf\u5708\u7535\u538b\u8fdb\u884c\u94b3\u4f4d\u3002\u8fd9\u79cd\u7ed3\u6784\u53ef\u5728\u52a0\u5feb\u91ca\u653e\u65f6\u95f4\u4e0e\u6676\u4f53\u7ba1\u7535\u538b\u5e94\u529b\u589e\u52a0\u4e4b\u95f4\u53d6\u5f97\u5e73\u8861\u3002
    \n\u94b3\u4f4d\u7535\u538b\\(V_{clamp}\\)<\/span> \u53ef\u901a\u8fc7\\(V_S\\)<\/span> \u3001\\(V_Z\\)<\/span> \u4ee5\u53ca\u7eed\u6d41\u4e8c\u6781\u7ba1\u7684\u6b63\u5411\u538b\u964d\\(V_F\\)<\/span> \u6c42\u5f97\uff1a<\/p>\n

    \\(V_{clamp}=V_S+V_Z+V_F\\)<\/span><\/p>\n

    \u94b3\u4f4d\u7535\u538b\u8d8a\u9ad8\uff0c\u7ebf\u5708\u7535\u6d41\u7684\u8870\u51cf\u901f\u5ea6\u5c31\u8d8a\u5feb\u3002\u65bd\u52a0\u5728\u6676\u4f53\u7ba1\u4e0a\u7684\u7535\u538b\u4e5f\u4f1a\u4e0a\u5347\u81f3\\(V_{clamp}\\)<\/span>\uff0c\u56e0\u6b64\u9700\u8981\u5c06\u5176\u63a7\u5236\u5728\u6676\u4f53\u7ba1\u7684\u8010\u538b\\(V_{CEO}\\)<\/span>\u4ee5\u4e0b\u3002\\(V_{clamp}\\)<\/span>\u8981\u5145\u5206\u4f4e\u4e8e\u6676\u4f53\u7ba1\u7684\\(V_{CEO}\\)<\/span>\u3002\u4f5c\u4e3a\u8d77\u70b9\uff0c\u5c06\\(V_{clamp}\\)<\/span>\u8bbe\u5b9a\u5728\\(V_{CEO}\\)<\/span>\u768470%~80%\u5de6\u53f3\u4ee5\u4e0b\u8f83\u4e3a\u5bb9\u6613\u4fdd\u7559\u88d5\u91cf\uff0c\u4f46\u6700\u7ec8\u4ecd\u9700\u901a\u8fc7\u5b9e\u9645\u8bbe\u5907\u7684\\(V_{CE}\\)<\/span>\u6ce2\u5f62\uff08\u6700\u5927\u503c\uff09\u548c\u6e29\u5347\u6765\u786e\u8ba4\u5176\u662f\u5426\u5728\u989d\u5b9a\u8303\u56f4\u5185\u3002\u9f50\u7eb3\u4e8c\u6781\u7ba1\u5e94\u8bc4\u4f30\u201c\u5355\u6b21\u5173\u65ad\u7684\u80fd\u91cf\u201d\u548c\u201c\u53cd\u590d\u65f6\u7684\u5e73\u5747\u529f\u7387\u201d\u3002\u82e5\u5c06\u521a\u521a\u5173\u65ad\u540e\u7684\u7ebf\u5708\u7535\u6d41\u8bbe\u4e3a\\(I_0\\)<\/span>\uff08\u2248 \\(I_{LOAD}\\)<\/span>\uff09\u3001\u7535\u6d41\u964d\u81f30\u7684\u8870\u51cf\u65f6\u95f4\u8bbe\u4e3a\\(t_{decay}\\)<\/span>\uff0c\u5219\u5728\u7535\u6d41\u5448\u5355\u8c03\u8870\u51cf\u7684\u524d\u63d0\u4e0b\uff0c\u5e73\u5747\u7535\u6d41\u7ea6\u4e3a\\(I_0\\)<\/span>\/2\uff0c\u56e0\u6b64\u9f50\u7eb3\u4e8c\u6781\u7ba1\u5438\u6536\u7684\u80fd\u91cf\u53ef\u8fd1\u4f3c\u4e3a \\(E_Z\\)<\/span> \u2248 \\(V_Z\\)<\/span> \u00d7 (\\(I_0\\)<\/span>\/2) \u00d7 \\(t_{decay}\\)<\/span>\u3002\u5bf9\u4e8ePWM\u7b49\u53cd\u590d\u5f00\u5173\u65f6\u7684\u5e73\u5747\u635f\u8017\uff0c\u53ef\u901a\u8fc7\\(P_{Z(avg)}\\)<\/span> \u2248 \\(E_Z\\)<\/span> \u00d7 \\(f\\)<\/span>\uff08\\(f\\)<\/span>\u4e3a\u5173\u65ad\u6b21\u6570\/\u79d2\uff09\u8fdb\u884c\u4f30\u7b97\uff0c\u5e76\u8fdb\u4e00\u6b65\u786e\u8ba4\u5176\u6ee1\u8db3\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u7684\u8109\u51b2\u529f\u7387\u989d\u5b9a\u503c\uff08\u76f8\u5f53\u4e8e\\(t_{decay}\\)<\/span>\u7684\u8109\u51b2\u5bbd\u5ea6\uff09\u3002\u7531\u4e8e\u5176\u94b3\u4f4d\u7535\u538b\u9ad8\u4e8e\u4e8c\u6781\u7ba1\u5355\u4f53\uff0c\u56e0\u6b64\u7535\u6d41\u8870\u51cf\u901f\u5ea6\u66f4\u5feb\uff0c\u91ca\u653e\u65f6\u95f4\u5f80\u5f80\u7f29\u77ed\u3002\u4f46\u662f\uff0c\u7531\u4e8e\u7f29\u77ed\u91cf\u4f1a\u56e0\u7ebf\u5708\u7684L\/R\u3001\u7535\u6e90\u7535\u538b\u3001\u673a\u68b0\u7ed3\u6784\u53ca\u9a71\u52a8\u6ce2\u5f62\u7b49\u56e0\u7d20\u800c\u663e\u8457\u53d8\u5316\uff0c\u56e0\u6b64\u9700\u8981\u901a\u8fc7\u5b9e\u9645\u8bbe\u5907\u8fdb\u884c\u6d4b\u91cf\u6765\u786e\u5b9a\u3002<\/p>\n

    RC\u7f13\u51b2\u7535\u8def\u7684\u5e94\u7528<\/strong>
    \n\u5c06\u7535\u963b\\(R\\)<\/span>\u548c\u7535\u5bb9\u5668\\(C\\)<\/span>\u4e32\u8054\u540e\uff0c\u4e0e\u7ebf\u5708\u5e76\u8054\u8fde\u63a5\u3002\u8fd9\u79cd\u7ed3\u6784\u53ef\u964d\u4f4e\u7535\u538b\u5c16\u5cf0\u5e45\u5ea6\u548c\u632f\u8361\u3002<\/p>\n

    RC\u7f13\u51b2\u7535\u8def\u5177\u6709\u51cf\u7f13\u7535\u538b\u4e0a\u5347\u901f\u5ea6\u3001\u6291\u5236\u7535\u538b\u5c16\u5cf0\u7684\u4f5c\u7528\u3002\u4e0e\u7eed\u6d41\u4e8c\u6781\u7ba1\u5e76\u7528\uff0c\u53ef\u964d\u4f4e\u4ec5\u9760\u4e8c\u6781\u7ba1\u65e0\u6cd5\u5b8c\u5168\u6291\u5236\u7684\u9ad8\u9891\u566a\u58f0\u3002\u4e24\u8005\u76f8\u7ed3\u5408\u7684\u65b9\u5f0f\uff0cEMI\u6027\u80fd\u6bd4\u53ea\u4f7f\u7528\u5176\u4e00\u65f6\u66f4\u4f18\u5f02\u3002<\/p>\n

    \u5e38\u6570\u7684\u8d77\u59cb\u70b9\u53c2\u8003\u503c\u4f1a\u56e0\u8d1f\u8f7d\u7535\u611f\u548c\u5de5\u4f5c\u9891\u7387\u7684\u4e0d\u540c\u800c\u6709\u6240\u53d8\u5316\uff0c\u5176\u6700\u4f18\u503c\u5e76\u975e\u56fa\u5b9a\u503c\u3002\\(C\\)<\/span>\u51b3\u5b9a\u7535\u538b\u7684\u4e0a\u5347\u901f\u5ea6\uff0c\\(R\\)<\/span>\u9650\u5236\u5c16\u5cf0\u7535\u6d41\u3002\u5f53\u7535\u963b\\(R\\)<\/span>\u8fc7\u5c0f\u65f6\uff0c\u5c16\u5cf0\u7535\u6d41\u4f1a\u589e\u5927\uff1b\u82e5\u7535\u963b\\(R\\)<\/span>\u8fc7\u5927\uff0c\u5219\u4f1a\u524a\u5f31\u7f13\u51b2\u7535\u8def\u7684\u6548\u679c\u3002\u4ece\u4e2d\u95f4\u503c\u5f00\u59cb\uff0c\u6839\u636e\u793a\u6ce2\u5668\u6d4b\u91cf\u7ed3\u679c\u8fdb\u884c\u8c03\u6574\u3002\u7535\u963b\u7684\u635f\u8017\\(P_R\\)<\/span> \u2252 1\/2 \u00d7 \\(C\\)<\/span> \u00d7 \\(V_{S^2}\\)<\/span> \u00d7 \\(f\\)<\/span>\uff08\\(f\\)<\/span>\u4e3a\u5f00\u5173\u9891\u7387\uff09\u9700\u63a7\u5236\u5728\u7535\u963b\u989d\u5b9a\u503c\u4ee5\u4e0b\u3002<\/p>\n

    \u4fdd\u62a4\u65b9\u5f0f\u7684\u9009\u62e9\u9700\u8981\u8003\u8651\u5230\u91ca\u653e\u65f6\u95f4\u8981\u6c42\u3001\u5f00\u5173\u9891\u7387\u4ee5\u53ca\u6676\u4f53\u7ba1\u8010\u538b\uff08\\(V_{CEO}\\)<\/span>\uff09\u7b49\u56e0\u7d20\u3002\u4e0b\u8868\u4e2d\u6c47\u603b\u4e86\u5177\u6709\u4ee3\u8868\u6027\u7684\u65b9\u5f0f\u3002<\/p>\n\n\n\n\n\n\n
    \u65b9\u5f0f<\/th>\n\u53c2\u8003\u7528\u9014<\/th>\n\u4f18\u70b9<\/th>\n\u9650\u5236\u548c\u6ce8\u610f\u4e8b\u9879<\/th>\n<\/tr>\n
    \u53ea\u6709\u7eed\u6d41\u4e8c\u6781\u7ba1<\/td>\n\u6807\u51c6\u7684\u7ee7\u7535\u5668\/\u7535\u78c1\u9600\u5f00\u5173\uff08\u91ca\u653e\u65f6\u95f4\u8981\u6c42\u4e0d\u4e25\u683c\uff09<\/td>\n\u7ed3\u6784\u7b80\u5355\u3001\u5143\u5668\u4ef6\u6570\u91cf\u5c11\uff0c\u4e14\u5bf9\u5b89\u88c5\u548c\u91c7\u8d2d\u6ce2\u52a8\u7684\u8010\u53d7\u6027\u5f3a<\/td>\n\u94b3\u4f4d\u7535\u538b\u4f4e\uff0c\u7ebf\u5708\u7535\u6d41\u7684\u8870\u51cf\u901f\u5ea6\u5bb9\u6613\u53d8\u6162\uff08\u5373\u91ca\u653e\u52a8\u4f5c\u5ef6\u8fdf\uff09\u3002<\/td>\n<\/tr>\n
    \u7eed\u6d41+\u9f50\u7eb3\u4e32\u8054<\/td>\n\u9700\u8981\u9ad8\u901f\u91ca\u653e\uff08\u4f8b\u5982\uff1a< 5ms\uff09\uff0c\u4e14\u6676\u4f53\u7ba1\u8010\u538b\u6709\u88d5\u91cf<\/td>\n\u94b3\u4f4d\u7535\u538b\u53ef\u8bbe\u7f6e\u5f97\u8f83\u9ad8\uff0c\u6613\u4e8e\u63d0\u9ad8\u7535\u6d41\u8870\u51cf\u901f\u5ea6\u3002\u94b3\u4f4d\u7535\u538b\u7684\u8bbe\u8ba1\u503c\u6613\u4e8e\u786e\u5b9a<\/td>\n\u6676\u4f53\u7ba1\u7684\u7535\u538b\u5e94\u529b\u589e\u52a0\u3002\u7531\u4e8e\u9f50\u7eb3\u635f\u8017\u589e\u52a0\uff0c\u6240\u4ee5\u9700\u8981\u5bf9\u989d\u5b9a\u503c\u548c\u6e29\u5ea6\u8fdb\u884c\u8bbe\u8ba1<\/td>\n<\/tr>\n
    RC\u7f13\u51b2\u7535\u8def\uff08\u5fc5\u8981\u65f6\u4e0e\u4e8c\u6781\u7ba1\u5e76\u7528\uff09<\/td>\n\u9ad8\u9891\u5f00\u5173\uff08\u4f8b\u5982\uff1a> 1 kHz\uff09\u6216\u6ce8\u91cd\u964d\u4f4eEMI\u7684\u5e94\u7528<\/td>\n\u53ef\u7f13\u548c\\(d_v\\)<\/span> \/ \\(d_t\\)<\/span> \uff0c\u4ece\u800c\u51cf\u5c11\u632f\u94c3\u53ca\u9ad8\u9891\u5c16\u5cf0<\/td>\n\u9700\u8981\u8fdb\u884c\u5e38\u6570\u8c03\u6574\u3002\u7531\u4e8e\u7535\u963b\u635f\u8017\u4f1a\u589e\u52a0\uff0c\u56e0\u6b64\u9700\u8981\u786e\u8ba4\u989d\u5b9a\u503c\u53ca\u6e29\u5347\u60c5\u51b5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u5728\u5b9e\u9645\u8bbe\u5907\u4e2d\uff0c\u4f7f\u7528\u793a\u6ce2\u5668\u786e\u8ba4\u5173\u65ad\u65f6\u7684\\(V_{CE}\\)<\/span> \u6ce2\u5f62\u548c\u91ca\u653e\u65f6\u95f4\uff0c\u5e76\u786e\u8ba4\u6ee1\u8db3\u89c4\u683c\u8981\u6c42\u3002<\/p>\n

    \u4fdd\u62a4\u5668\u4ef6\u4e0d\u4ec5\u201c\u5728\u7535\u8def\u56fe\u4e2d\u7684\u4f4d\u7f6e\u201d\u4f1a\u5f71\u54cd\u6027\u80fd\uff0c\u5176\u201c\u5b89\u88c5\u4f4d\u7f6e\u201d\u4e5f\u4e0e\u6027\u80fd\u76f4\u63a5\u76f8\u5173\u3002\u7eed\u6d41\u4e8c\u6781\u7ba1\u548cRC\u7f13\u51b2\u7535\u8def\u5e94\u5c3d\u91cf\u9760\u8fd1\u7ebf\u5708\u5f15\u811a\uff08\u8d1f\u8f7d\uff09\u5b89\u88c5\uff0c\u7f29\u5c0f\u56de\u8def\u9762\u79ef\uff0c\u6709\u52a9\u4e8e\u6291\u5236\u5c16\u5cf0\u548c\u8f90\u5c04\u566a\u58f0\u3002<\/p>\n

    \u4f4e\u8fb9\u5f00\u5173\u7535\u8def\u635f\u8017\u548c\u53d1\u70ed\u91cf\u7684\u7b80\u6613\u4f30\u7b97<\/h2>\n

    \u9971\u548c\u65f6\u7684\u635f\u8017\u901a\u8fc7\\(V_{CE(sat)}\\)<\/span>\u4e0e\u96c6\u7535\u6781\u7535\u6d41\u4e4b\u79ef\u6c42\u5f97\u3002\u9700\u786e\u8ba4\u8be5\u503c\u672a\u8d85\u8fc7\u5668\u4ef6\u7684\u5bb9\u8bb8\u635f\u8017\u3002\u5982\u679c\u8d85\u51fa\u5bb9\u8bb8\u8303\u56f4\uff0c\u5e94\u8003\u8651\u63d0\u9ad8\u5668\u4ef6\u89c4\u683c\u7b49\u7ea7\u6216\u66f4\u6362\u4e3aMOSFET\u3002<\/p>\n

    \u901a\u8fc7P\uff1d\\(V_{CE(sat)}\\)<\/span> \u00d7 \\(I_C\\)<\/span> \u00d7 Duty\u8ba1\u7b97\u51fa\u7684\u635f\u8017\u53c2\u8003\u503c<\/h3>\n

    \u6676\u4f53\u7ba1\u4f5c\u4e3a\u9971\u548c\u5f00\u5173\u5bfc\u901a\u65f6\uff0c\u5728\u96c6\u7535\u6781-\u53d1\u5c04\u6781\u4e4b\u95f4\u4f1a\u6b8b\u7559\u7535\u538b\\(V_{CE(sat)}\\)<\/span>\u3002\u8be5\u7535\u538b\u4e0e\u96c6\u7535\u6781\u7535\u6d41\u7684\u4e58\u79ef\uff0c\u5373\u4e3a\u6676\u4f53\u7ba1\u6240\u6d88\u8017\u7684\u529f\u7387\u3002\u5360\u7a7a\u6bd4Duty\u8868\u793a\u5bfc\u901a\u65f6\u95f4\u7684\u6bd4\u4f8b\uff1a<\/p>\n

    \\(P\u2248V_{CE}(sat)\\times I_C\\times Duty\\)<\/span><\/p>\n

    \u8fde\u7eed\u5bfc\u901a\u65f6\uff0cDuty = 1\uff1bPWM\u9a71\u52a8\u4e14\u5bfc\u901a\u65f6\u95f4\u4e3a50%\u65f6\uff0cDuty=0.5\u3002\u6839\u636e\u5e94\u7528\u4ea7\u54c1\u7684\u5f00\u5173\u6a21\u5f0f\u8ba1\u7b97\u5b9e\u9645\u5360\u7a7a\u6bd4\u3002
    \n\u5728\u8bbe\u8ba1\u793a\u4f8b\u4e2d\u8ba1\u7b97\u635f\u8017\uff1a
    \n\u8bbe\u8ba1\u793a\u4f8b\u2460\uff1a5 V\u7ee7\u7535\u5668\u9a71\u52a8\uff08\\(I_C\\)<\/span> = 200 mA\uff0c\u8fde\u7eed\u5bfc\u901a\uff09
    \n\u5047\u8bbe\\(V_{CE(sat)}\\)<\/span> = 0.2 V\u3002\u7531\u4e8eDuty = 1\uff0c\u6240\u4ee5\uff1a<\/p>\n

    \\(P\u22480.2\\times 0.2\\times 1=40mW\\)<\/span><\/p>\n

    \u8bbe\u8ba1\u793a\u4f8b\u2461\uff1a12 V\u7535\u78c1\u9600\u9a71\u52a8\uff08\\(I_C\\)<\/span> = 70 mA\u3001\u8fde\u7eed\u5bfc\u901a\uff09
    \n\u5047\u8bbe\\(V_{CE(sat)}\\)<\/span> = 0.2 V\u3002\u7531\u4e8eDuty = 1\uff0c\u6240\u4ee5\uff1a<\/p>\n

    \\(P\u22480.2\\times 0.07\\times 1=14mW\\)<\/span><\/p>\n

    \u5c0f\u4fe1\u53f7\u6676\u4f53\u7ba1\u7684\u5bb9\u8bb8\u635f\u8017\u901a\u5e38\u4e3a300~500mW\u5de6\u53f3\u3002\u8bbe\u8ba1\u793a\u4f8b\u2460\u7684\u635f\u8017\u4e3a40mW\uff0c\u8bbe\u8ba1\u793a\u4f8b\u2461\u7684\u635f\u8017\u4e3a14mW\uff0c\u56e0\u6b64\u5747\u5bf9\u5bb9\u8bb8\u635f\u8017\u6709\u5145\u5206\u88d5\u91cf\u3002\u786e\u8ba4\u70ed\u963b\uff08\u7ed3\u5230\u73af\u5883\uff09\uff0c\u4ee5\u786e\u4fdd\u6e29\u5347\u662f\u63a7\u5236\u5728\u5bb9\u8bb8\u8303\u56f4\u5185\u7684\u3002<\/p>\n

    \u4e0b\u9762\u6765\u770b\u76f8\u5bf9\u4e8e\u5bb9\u8bb8\u635f\u8017\u7684\u6bd4\u7387\u3002<\/p>\n\n\n\n\n\n
    \u8bbe\u8ba1\u793a\u4f8b<\/th>\n\u635f\u8017P<\/th>\n\u5bb9\u8bb8\u635f\u8017<\/th>\n\u6bd4\u7387<\/th>\n\u5224\u5b9a<\/th>\n<\/tr>\n
    \u2460\u7ee7\u7535\u5668<\/td>\n40 mW<\/td>\n300 mW<\/td>\n13%<\/td>\n\u6709\u88d5\u91cf<\/td>\n<\/tr>\n
    \u2461\u7535\u78c1\u9600<\/td>\n14 mW<\/td>\n300 mW<\/td>\n5%<\/td>\n\u6709\u88d5\u91cf<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u635f\u8017\u5747\u5728\u5bb9\u8bb8\u635f\u8017\u768420%\u4ee5\u4e0b\u3002\u5728\u6807\u51c6\u5de5\u4f5c\u73af\u5883\uff08\u73af\u5883\u6e29\u5ea625~70\u2103\uff09\u4e0b\uff0c\u4e0d\u4f1a\u51fa\u73b0\u53d1\u70ed\u95ee\u9898\u3002\u635f\u8017\u76f8\u5bf9\u4e8e\u5bb9\u8bb8\u635f\u8017\u8d8a\u4f4e\uff0c\u8d8a\u5bb9\u6613\u83b7\u5f97\u6e29\u5ea6\u88d5\u5ea6\uff0c\u4f46\u7ed3\u6e29\u7531\u73af\u5883\u6e29\u5ea6\u3001\u7535\u8def\u677f\u6563\u70ed\u548c\u5c01\u88c5\u70ed\u963b\u5171\u540c\u51b3\u5b9a\u3002\u4f5c\u4e3a\u53c2\u8003\uff0c\u5373\u4f7f\u635f\u8017\u5728\u5bb9\u8bb8\u635f\u8017\u7684\u6570\u5341%\u4ee5\u4e0b\uff0c\u5728\u9ad8\u6e29\u73af\u5883\u6216\u5bc6\u95ed\u58f3\u4f53\u4e2d\u6e29\u5ea6\u4ecd\u4f1a\u4e0a\u5347\u3002\u6700\u7ec8\u9700\u901a\u8fc7\u6700\u5dee\u6761\u4ef6\u4e0b\u7684\u6e29\u5ea6\u4f30\u7b97\uff08\u70ed\u963b\uff09\u6216\u5b9e\u9645\u6d4b\u91cf\u6765\u5224\u65ad\u3002\u572850%~80%\u7684\u8303\u56f4\u5185\uff0c\u82e5\u5728\u9ad8\u6e29\u73af\u5883\uff08>70\u2103\uff09\u6216\u5bc6\u95ed\u58f3\u4f53\u4e2d\u4f7f\u7528\u65f6\u9700\u7279\u522b\u6ce8\u610f\u3002\u8d85\u8fc780%\u65f6\uff0c\u9700\u8981\u8003\u8651\u63d0\u9ad8\u5668\u4ef6\u89c4\u683c\u7b49\u7ea7\u6216\u91cd\u65b0\u8bc4\u4f30\u914d\u7f6e\u3002\u5728\u6700\u5dee\u6761\u4ef6\u6d4b\u8bd5\u65f6\uff0c\u9700\u6d4b\u91cf\u5b9e\u9645\u7ed3\u6e29\u4ee5\u786e\u8ba4\u88d5\u91cf\u3002<\/p>\n

    \"\u901a\u8fc7P\uff1dVCE(sat)\u00d7IC\u00d7Duty\u8ba1\u7b97\u51fa\u7684\u635f\u8017\u53c2\u8003\u503c\"<\/p>\n

    \u8d85\u8fc7\u5bb9\u8bb8\u635f\u8017\u65f6\u7684\u5e94\u5bf9\u63aa\u65bd\uff08\u5668\u4ef6\u5347\u7ea7\/\u91cd\u65b0\u8bc4\u4f30\u914d\u7f6e\uff09<\/h3>\n

    \u5f53\u8ba1\u7b97\u51fa\u7684\u635f\u8017\u63a5\u8fd1\u5bb9\u8bb8\u635f\u8017\u65f6\uff0c\u53ef\u8003\u8651\u91c7\u53d6\u4ee5\u4e0b\u5bf9\u7b56\uff1a<\/p>\n

    \u5668\u4ef6\u5347\u7ea7<\/strong>
    \n\u66f4\u6362\u4e3a\u5bb9\u8bb8\u635f\u8017\u66f4\u5927\u7684\u4ea7\u54c1\u3002\u4ece\u5c0f\u4fe1\u53f7\u6676\u4f53\u7ba1\u66f4\u6362\u4e3a\u4e2d\u7b49\u529f\u7387\u6676\u4f53\u7ba1\u540e\uff0c\u5bb9\u8bb8\u529f\u8017\u53ef\u4ece300mW\u63d0\u5347\u81f3\u6570W\u7ea7\u3002\u4f46\u9700\u8981\u6ce8\u610f\u5c01\u88c5\u5c3a\u5bf8\u4f1a\u589e\u5927\uff0c\u5bfc\u81f4\u5b89\u88c5\u9762\u79ef\u589e\u52a0\uff1b\u6b64\u5916\uff0c\u82e5\u635f\u8017\u6c34\u5e73\u8d85\u8fc71W\uff0c\u5219\u53ef\u80fd\u9700\u8981\u52a0\u88c5\u6563\u70ed\u5668\u3002<\/p>\n

    \u540c\u65f6\u8fd8\u5e94\u786e\u8ba4\u96c6\u7535\u6781\u7535\u6d41\u989d\u5b9a\u503c\u3002\u4f8b\u5982\uff0c\u82e5\u4ee5\\(I_C\\)<\/span> = 500 mA\u8fdb\u884c\u8bbe\u8ba1\uff0c\u9009\u7528\\(I_{C(max)}\\)<\/span> = 500 mA\u7684\u5668\u4ef6\u5c31\u7f3a\u4e4f\u88d5\u91cf\u3002\u82e5\u9009\u62e9\\(I_{C(max)}\\)<\/span> \u2265 1 A\u7684\u5668\u4ef6\uff0c\u5219\u4f7f\u7528\u7387\u4e3a\u989d\u5b9a\u503c\u768450%\uff0c\u8fd9\u5c31\u7559\u51fa\u4e86\u8bbe\u8ba1\u88d5\u91cf\u3002\u8bf7\u5728\u6280\u672f\u89c4\u683c\u4e66\u4e2d\u786e\u8ba4\u8fde\u7eed\u7535\u6d41\u989d\u5b9a\u503c\u548c\u8109\u51b2\u7535\u6d41\u989d\u5b9a\u503c\u3002<\/p>\n

    \u5305\u62ecDuty\u5728\u5185\u7684\u5b9e\u9645\u4f7f\u7528\u6761\u4ef6\u4e0b\u7684\u91cd\u65b0\u8bc4\u4f30<\/strong>
    \n\u82e5\u4ee5\u8fde\u7eed\u5bfc\u901a\uff08Duty = 1\uff09\u4e3a\u524d\u63d0\u8fdb\u884c\u8ba1\u7b97\uff0c\u4f1a\u5c06\u635f\u8017\u503c\u4f30\u7b97\u5f97\u504f\u5927\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u7531\u4e8ePWM\u9a71\u52a8\u548c\u53cd\u590d\u5f00\/\u5173\uff0c\u5e73\u5747\u5bfc\u901a\u65f6\u95f4\u53ef\u80fd\u8f83\u77ed\u3002\u5e94\u4f7f\u7528\u793a\u6ce2\u5668\u6d4b\u91cf\u5b9e\u9645\u5360\u7a7a\u6bd4\uff0c\u4ee5\u6b64\u5224\u65ad\u771f\u5b9e\u7684\u635f\u8017\u3002<\/p>\n

    \u4f8b\u5982\uff0cDuty = 0.3\uff08\u5bfc\u901a\u65f6\u95f430%\uff09\u65f6\uff1a<\/p>\n\n\n\n\n
    \u6761\u4ef6<\/th>\nDuty = 1<\/th>\nDuty = 0.3<\/th>\n\u524a\u51cf\u7387<\/th>\n<\/tr>\n
    \u8bbe\u8ba1\u793a\u4f8b\u2460<\/td>\n40 mW<\/td>\n12 mW<\/td>\n\u524a\u51cf70%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u5360\u7a7a\u6bd4\u8d8a\u5c0f\uff0c\u635f\u8017\u8d8a\u4f4e\uff0c\u5668\u4ef6\u9009\u578b\u7684\u7a7a\u95f4\u4e5f\u5c31\u8d8a\u5927\u3002\u8bf7\u786e\u8ba4\u5b9e\u9645\u4f7f\u7528\u6761\u4ef6\u4e0b\u7684\u5360\u7a7a\u6bd4\uff0c\u5e76\u57fa\u4e8e\u6b64\u91cd\u65b0\u8ba1\u7b97\u635f\u8017\u3002\u786e\u7acb\u70ed\u8bbe\u8ba1\u88d5\u91cf\u65f6\uff0c\u9700\u8981\u8003\u8651\u6700\u574f\u60c5\u51b5\u4e0b\u7684\u5360\u7a7a\u6bd4\uff0c\u800c\u975e\u5178\u578b\u5de5\u4f5c\u72b6\u6001\u4e0b\u7684\u5360\u7a7a\u6bd4\u3002<\/p>\n

    \u66ff\u6362\u4e3aMOSFET<\/strong>
    \n\u5f53\u635f\u8017\u8fdc\u8d85\u5bb9\u8bb8\u503c\uff0c\u6216\\(I_C\\)<\/span> \u2265 1 A\u65f6\uff0c\u53ef\u8003\u8651\u5c06NPN\u6676\u4f53\u7ba1\u66ff\u6362\u4e3aMOSFET\u3002MOSFET\u7684\u635f\u8017\u7531\u5bfc\u901a\u7535\u963b\\(R_{DS(on)}\\)<\/span>\u51b3\u5b9a\uff1a<\/p>\n

    \\(P\u2248R_{DS}(on)\\times {I_C}^2\\times Duty\\)<\/span><\/p>\n

    \u4e0e\u8bbe\u8ba1\u793a\u4f8b\u2460\u76f8\u540c\u7684200mA\u7535\u6d41\u6761\u4ef6\u4e0b\uff0c\u5f53\\(R_{DS(on)}\\)<\/span> = 0.2 \u03a9\u65f6\uff1a<\/p>\n

    \\(P\u22480.2\\times 0.2^2\\times 1=8mW\\)<\/span><\/p>\n

    \u4e0eNPN\u6676\u4f53\u7ba1\u768440mW\u76f8\u6bd4\uff0c\u635f\u8017\u53ef\u964d\u4f4e\u81f31\/5\u3002\u7535\u6d41\u8d8a\u5927\uff0cMOSFET\u7684\u4f18\u52bf\u8d8a\u663e\u8457\u3002\\(I_C\\)<\/span> = 1 A\u3001\\(R_{DS(on)}\\)<\/span> = 0.1 \u03a9\u65f6\uff1a<\/p>\n

    \\(P\u22480.1\\times 1^2\\times 1=100mW\\)<\/span><\/p>\n

    NPN\u6676\u4f53\u7ba1\u5728\\(V_{CE(sat)}\\)<\/span> = 0.2 V\u3001\\(I_C\\)<\/span> = 1 A\u65f6\uff0cP = 200mW\uff0c\u56e0\u6b64\u4f7f\u7528MOSFET\u53ef\u5c06\u635f\u8017\u964d\u4f4e\u4e00\u534a\u3002\u5728\u8fd9\u79cd\u7535\u6d41\u6c34\u5e73\u4e0b\uff0c\u5f53\u6548\u7387\u6210\u4e3a\u4e3b\u8981\u8bbe\u8ba1\u9a71\u52a8\u56e0\u7d20\uff0c\u6216\u8005\u6676\u4f53\u7ba1\u7684\u6563\u70ed\u6781\u9650\u9650\u5236\u4e86\u8bbe\u8ba1\u65f6\uff0c\u5e94\u9009\u62e9MOSFET\u3002<\/p>\n

    \u7528\u4e8e\u5b9e\u673a\u9a8c\u8bc1\u7684\u4f4e\u8fb9\u5f00\u5173\u7535\u8def\u5fc5\u4e0d\u53ef\u6536\u7684\u9a8c\u8bc1\u6b65\u9aa4<\/h2>\n

    \u8bbe\u8ba1\u503c\u7684\u5408\u7406\u6027\uff0c\u53ef\u4ee5\u901a\u8fc7\u6d4b\u91cf\\(V_{BE}\\)<\/span> \u3001\\(I_C\\)<\/span> \u3001\\(V_{CE(sat)}\\)<\/span>\u4e09\u4e2a\u53c2\u6570\u6765\u5224\u65ad\u3002\u5982\u679c\u6709\u793a\u6ce2\u5668\uff0c\u4e5f\u8981\u786e\u8ba4\u5173\u65ad\u65f6\u7684\u4e8c\u6781\u7ba1\u94b3\u4f4d\u6ce2\u5f62\u3002<\/p>\n

    \u901a\u8fc7DMM\u786e\u8ba4\u76843\u4e2a\u5173\u952e\u70b9\uff08\\(V_{BE}\\)<\/span>\/\\(I_C\\)<\/span>\/\\(V_{CE(sat)}\\)<\/span>\uff09<\/h3>\n

    \u5b8c\u6210\u7406\u8bba\u8bbe\u8ba1\u540e\uff0c\u9700\u8981\u901a\u8fc7\u5b9e\u9645\u8bbe\u5907\u6765\u786e\u8ba4\u5de5\u4f5c\u60c5\u51b5\u3002\u901a\u8fc7\u6570\u5b57\u4e07\u7528\u8868\uff08DMM\uff09\u6d4b\u91cf\u4e09\u4e2a\u53c2\u6570\uff0c\u5373\u53ef\u5224\u65ad\u8bbe\u8ba1\u7684\u5408\u7406\u6027\u3002\u5728\u6d4b\u91cf\u524d\uff0c\u5c06\u4e07\u7528\u8868\u8bbe\u5b9a\u4e3a\u5408\u9002\u7684\u91cf\u7a0b\u3002\\(V_{BE}\\)<\/span> \u548c\\(V_{CE}\\)<\/span> \u4f7f\u75282V\u91cf\u7a0b\u66f4\u4fbf\u4e8e\u64cd\u4f5c\uff0c\u4f46IC<\/sub>\u82e5\u9884\u671f\u7535\u6d41\u63a5\u8fd1\u91cf\u7a0b\u4e0a\u9650\uff0c\u5219\u5b58\u5728\u4fdd\u9669\u4e1d\u7194\u65ad\u7684\u98ce\u9669\u3002\u9996\u5148\uff0c\u4f7f\u7528\u9ad8\u91cf\u7a0b\uff08\u4f8b\u5982\uff1a10A\u5f15\u811a\uff09\u6216\u7535\u6d41\u68c0\u6d4b\u7535\u963b\u65b9\u5f0f\u8fdb\u884c\u521d\u6b65\u8bc4\u4f30\uff0c\u5728\u786e\u8ba4\u786e\u5b9e\u5728\u91cf\u7a0b\u8303\u56f4\u5185\u4e4b\u540e\uff0c\u518d\u5207\u6362\u81f3\u9ad8\u7cbe\u5ea6\u91cf\u7a0b\u3002<\/p>\n

    \"\u901a\u8fc7DMM\u786e\u8ba4\u76843\u4e2a\u5173\u952e\u70b9\"<\/p>\n

    \\(V_{BE}\\)<\/span>\uff08\u57fa\u6781-\u53d1\u5c04\u6781\u95f4\u7535\u538b\uff09<\/strong>
    \n\u5728\u6676\u4f53\u7ba1\u5bfc\u901a\u65f6\uff0c\u6d4b\u91cf\u57fa\u6781-\u53d1\u5c04\u6781\u4e4b\u95f4\u7684\u7535\u538b\u3002\u5f88\u591a\u5c0f\u4fe1\u53f7NPN\u6676\u4f53\u7ba1\uff0c\u5bfc\u901a\u65f6\u7684\\(V_{BE}\\)<\/span>\u5927\u81f4\u57280.6~0.9V\u8303\u56f4\u5185\u3002\u4f46\u662f\\(V_{BE}\\)<\/span>\u4f9d\u8d56\u4e8e\u7535\u6d41\u548c\u6e29\u5ea6\uff0c\u5728\u57fa\u6781\u7535\u6d41\u8f83\u5927\u7684\u60c5\u51b5\u4e0b\uff0c\u5176\u503c\u4e5f\u53ef\u80fd\u770b\u8d77\u6765\u504f\u9ad8\u3002\u4e0d\u80fd\u4ec5\u51ed\u8be5\u503c\u5224\u65ad\u597d\u574f\uff0c\u8fd8\u9700\u7ed3\u5408\u540e\u8ff0\u7684\\(I_C\\)<\/span>\u548c\\(V_{CE(sat)}\\)<\/span>\u8fdb\u884c\u7efc\u5408\u786e\u8ba4\u3002<\/p>\n

    \u5f53\u6d4b\u91cf\u503c\u57280.5V\u4ee5\u4e0b\u65f6\uff0c\u5e94\u6000\u7591\u5b58\u5728\u57fa\u6781\u7535\u6d41\u4e0d\u8db3\u3001GPIO\u8f93\u51fa\u7535\u538b\u4e0d\u8db3\u3001\u4ee5\u53ca\u7ebf\u8def\u6216\u63a2\u5934\u8fde\u63a5\u9519\u8bef\u7b49\u95ee\u9898\u3002\u786e\u8ba4\\(R_B\\)<\/span>\u7684\u503c\u548c\u8fde\u63a5\u4f4d\u7f6e\uff0c\u5fc5\u8981\u65f6\u51cf\u5c0f\\(R_B\\)<\/span>\u4ee5\u63d0\u9ad8\\(I_B\\)<\/span>\u3002\u5f53\u6d4b\u91cf\u503c\u8fdc\u8d851.0V\u65f6\uff0c\u53ef\u80fd\u5b58\u5728\u57fa\u6781\u7535\u6d41\u8fc7\u5927\u3001\u6d4b\u91cf\u4f4d\u7f6e\u9519\u8bef\u6216\u5668\u4ef6\u5f02\u5e38\uff08\u5305\u62ec\u635f\u574f\uff09\u7684\u53ef\u80fd\u6027\u3002\u6b64\u65f6\u4e0d\u5e94\u7acb\u5373\u5224\u65ad\u4e3a\u6545\u969c\uff0c\u800c\u662f\u9700\u8981\u786e\u8ba4\u63a2\u5934\u7684\u8fde\u63a5\u60c5\u51b5\uff0c\u7136\u540e\u91cd\u65b0\u6d4b\u91cf\uff0c\u5e76\u7ed3\u5408\\(V_{CE(sat)}\\)<\/span>\u7684\u8868\u73b0\u8fdb\u884c\u7efc\u5408\u5224\u65ad\u3002<\/p>\n

    \\(I_C\\)<\/span>\uff08\u96c6\u7535\u6781\u7535\u6d41\uff09<\/strong>
    \n\u6d4b\u91cf\u6d41\u8fc7\u8d1f\u8f7d\u7684\u7535\u6d41\u3002\u5c06\u7ee7\u7535\u5668\u548c\u7535\u78c1\u9600\u7684\u89c4\u683c\u503c\u4e0e\u5b9e\u6d4b\u503c\u8fdb\u884c\u5bf9\u6bd4\u3002\u53ef\u5c06\u7535\u6d41\u8868\u4e0e\u8d1f\u8f7d\u4e32\u8054\u63d2\u5165\uff0c\u6216\u8005\u6d4b\u91cf\u5df2\u77e5\u7535\u6d41\u68c0\u6d4b\u7535\u963b\u4e0a\u7684\u7535\u538b\u964d\u3002<\/p>\n

    \u5982\u679c\u6d4b\u91cf\u503c\u6bd4\u89c4\u683c\u503c\u5c0f10%\u4ee5\u4e0a\uff0c\u5219\u8868\u793a\u6676\u4f53\u7ba1\u53ef\u80fd\u672a\u5145\u5206\u5bfc\u901a\uff0c\u6216\u8d1f\u8f7d\u4fa7\u53ef\u80fd\u5b58\u5728\u95ee\u9898\u3002\u82e5\u6d4b\u91cf\u503c\u8d85\u51fa\u89c4\u683c\u503c\uff0c\u53ef\u80fd\u662f\u8d1f\u8f7d\u7684\u7535\u963b\u503c\u6216\u7535\u611f\u503c\u4e0e\u89c4\u683c\u4e0d\u7b26\uff0c\u6216\u7535\u6e90\u7535\u538b\u8fc7\u9ad8\u6240\u5bfc\u81f4\u3002\u5728\u8c03\u6574\u7535\u8def\u4e4b\u524d\uff0c\u8bf7\u5148\u786e\u8ba4\u8d1f\u8f7d\u7279\u6027\u548c\u4f9b\u7535\u7535\u538b\u3002<\/p>\n

    \\(V_{CE(sat)}\\)<\/span>\uff08\u96c6\u7535\u6781-\u53d1\u5c04\u6781\u95f4\u9971\u548c\u7535\u538b\uff09<\/strong>
    \n\u5728\u6676\u4f53\u7ba1\u7684\u5bfc\u901a\u65f6\uff0c\u6d4b\u91cf\u96c6\u7535\u6781\u4e0e\u53d1\u5c04\u6781\u4e4b\u95f4\u7684\u7535\u538b\u3002\u82e5\u4f5c\u4e3a\u9971\u548c\u5f00\u5173\u5de5\u4f5c\uff0c\\(V_{CE}\\)<\/span>\u5e94\u63a7\u5236\u57280.3V\u4ee5\u4e0b\u3002\u8be5\u503c\u9ad8\u5219\u8868\u793a\u9971\u548c\u88d5\u91cf\u4e0d\u8db3\u3002<\/p>\n

    \u5f53\u6d4b\u91cf\u503c\u57280.5V\u4ee5\u4e0a\u65f6\uff0c\u53ef\u80fd\u662f\u57fa\u6781\u7535\u6d41\u4e0d\u8db3\uff0c\u5de5\u4f5c\u5728\u653e\u5927\u533a\u3002\u6b64\u65f6\u9700\u51cf\u5c0f\\(R_B\\)<\/span>\u4ee5\u63d0\u9ad8\\(I_B\\)<\/span>\uff0c\u6216\u8005\u91cd\u65b0\u8bbe\u5b9a\u66f4\u5c0f\u7684\\(\u03b2_{forced}\\)<\/span>\u503c\u3002\u5f53\u6d4b\u5b9a\u503c\u57281V\u4ee5\u4e0a\u65f6\uff0c\u9700\u91cd\u65b0\u5ba1\u89c6\u6676\u4f53\u7ba1\u9009\u578b\u672c\u8eab\u3002\u786e\u8ba4\u5668\u4ef6\u7684\\(h_{FE(min)}\\)<\/span>\u89c4\u683c\uff0c\u5e76\u9a8c\u8bc1\u6240\u9009\u7684\\(\u03b2_{forced}\\)<\/span>\u662f\u5426\u80fd\u63d0\u4f9b\u8db3\u591f\u7684\u88d5\u91cf\u3002<\/p>\n\n\n\n\n\n\n
    \u6d4b\u91cf\u9879\u76ee<\/th>\n\u6b63\u5e38\u8303\u56f4<\/th>\n\u5f02\u5e38\u65f6\u7684\u5e94\u5bf9\u63aa\u65bd<\/th>\n<\/tr>\n
    \\(V_{BE}\\)<\/span><\/td>\n0.6\u20130.9 V<\/td>\n0.5 V\u4ee5\u4e0b\u2192\u51cf\u5c0f\\(R_B\\)<\/span><\/td>\n<\/tr>\n
    \\(I_C\\)<\/span><\/td>\n\u89c4\u683c\u503c\u00b110%<\/td>\n\u5c0f\u4e8e\u89c4\u683c\u2192\u786e\u8ba4\u9971\u548c\u72b6\u6001<\/td>\n<\/tr>\n
    \\(V_{CE(sat)}\\)<\/span><\/td>\n0.3 V\u4ee5\u4e0b<\/td>\n0.5 V\u4ee5\u4e0a\u2192\u63d0\u9ad8\\(I_B\\)<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u53ea\u8981\u6d4b\u91cf\u8fd9\u4e09\u4e2a\u9879\u76ee\uff0c\u5373\u53ef\u5224\u65ad\u6676\u4f53\u7ba1\u662f\u5426\u6309\u8bbe\u8ba1\u5b9e\u73b0\u4e86\u9971\u548c\uff0c\u4ee5\u53ca\u8d1f\u8f7d\u662f\u5426\u6b63\u5e38\u5de5\u4f5c\u3002\u5982\u51fa\u73b0\u5f02\u5e38\uff0c\u53ef\u6839\u636e\u6d4b\u91cf\u503c\u9501\u5b9a\u539f\u56e0\u5e76\u91c7\u53d6\u5bf9\u7b56\u3002\u5e94\u8bb0\u5f55\u6240\u6709\u6d4b\u91cf\u6570\u636e\uff0c\u5305\u62ec\u8bbe\u5907\u578b\u53f7\u3001\u6821\u51c6\u65e5\u671f\u548c\u6d4b\u8bd5\u6761\u4ef6\uff0c\u4ee5\u786e\u4fdd\u53ef\u8ffd\u6eaf\u6027\u3002<\/p>\n

    \u7528\u793a\u6ce2\u5668\u89c2\u5bdf\u5173\u65ad\u65f6\u7684\u94b3\u4f4d\u6ce2\u5f62<\/h3>\n

    \u5982\u679c\u6709\u793a\u6ce2\u5668\uff0c\u53ef\u89c2\u5bdf\u6676\u4f53\u7ba1\u5173\u65ad\u65f6\u7684\\(V_{CE}\\)<\/span> \u6ce2\u5f62\u3002\u6839\u636e\u8be5\u6ce2\u5f62\uff0c\u53ef\u786e\u8ba4\u7eed\u6d41\u4e8c\u6781\u7ba1\u662f\u5426\u6b63\u5e38\u5de5\u4f5c\uff0c\u4ee5\u53ca\u53cd\u7535\u52a8\u52bf\u662f\u5426\u88ab\u6b63\u786e\u94b3\u5236\u3002<\/p>\n

    \u6d4b\u91cf\u70b9\u4f4d\u4e8e\u6676\u4f53\u7ba1\u7684\u96c6\u7535\u6781\u3002\u63a2\u5934\u7684\u5730\u7ebf\u8fde\u63a5\u81f3\u53d1\u5c04\u6781\u6216GND\u3002\u4f7f\u6676\u4f53\u7ba1\u53cd\u590d\u5bfc\u901a\u548c\u5173\u65ad\uff0c\u89c2\u6d4b\u5207\u6362\u81f3\u5173\u65ad\u77ac\u95f4\u7684\u6ce2\u5f62\u3002\u4f7f\u7528\u5355\u6b21\u89e6\u53d1\u529f\u80fd\uff0c\u51c6\u786e\u6355\u6349\u77ac\u6001\u73b0\u8c61\u3002\u53ef\u5c06\u8be5\u6570\u636e\u4fdd\u5b58\u81f3\u65e5\u5fd7\u6587\u4ef6\uff0c\u4ee5\u4f9b\u65e5\u540e\u53c2\u8003\u548c\u4f5c\u4e3a\u652f\u6301\u6587\u6863\u4f7f\u7528\u3002<\/p>\n

    \u4ec5\u4f7f\u7528\u7eed\u6d41\u4e8c\u6781\u7ba1\u65f6<\/strong>
    \n\u5173\u65ad\u65f6\uff0c\\(V_{CE}\\)<\/span> \u4e0a\u5347\u81f3\u7535\u6e90\u7535\u538b\\(V_S\\)\u9644\u8fd1\uff0c\u5e76\u5728\u6ca1\u6709\u8f83\u5927\u5c16\u5cf0\u7684\u60c5\u51b5\u4e0b\u8d8b\u4e8e\u7a33\u5b9a\u3002\u5982\u679c\u6ce2\u5f62\u672a\u5927\u5e45\u8d85\u8fc7\u7535\u6e90\u7535\u538b\uff0c\u4e14\u632f\u52a8\u548c\u632f\u94c3\u8f83\u5c11\uff0c\u8bf4\u660e\u4e8c\u6781\u7ba1\u5de5\u4f5c\u6b63\u5e38\u3002\u6ce2\u5f62\u7684\u8c03\u6574\u65f6\u95f4\uff08\u6307\u632f\u94c3\u8870\u51cf\u540e\uff0c\\(V_{CE}\\)<\/span> \u7a33\u5b9a\u81f3\u51e0\u4e4e\u6052\u5b9a\u503c\u6240\u9700\u7684\u65f6\u95f4\uff09\u4f1a\u56e0\u5e03\u7ebf\u3001\u5bc4\u751f\u7535\u5bb9\u3001\u8d1f\u8f7d\u7535\u611f\u7b49\u56e0\u7d20\u800c\u53d8\u5316\uff0c\u901a\u5e38\u4e3a\u6570\u5341\u00b5s~\u6570\u767e\u00b5s\u5de6\u53f3\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u8fd9\u91cc\u63a2\u8ba8\u7684\u662f\u7535\u538b\u6ce2\u5f62\uff0c\u7ebf\u5708\u7535\u6d41\u548c\u673a\u68b0\u91ca\u653e\u65f6\u95f4\u901a\u5e38\u4ee5ms\uff08\u6beb\u79d2\uff09\u7ea7\u53e6\u884c\u8bc4\u4f30\u3002<\/p>\n

    \u82e5\\(V_{CE}\\)<\/span> \u51fa\u73b0\u76f8\u5bf9\u4e8e\u7535\u6e90\u7535\u538b\u6781\u7aef\u9ad8\u7684\u5c16\u5cf0\uff08\u7535\u6e90\u7535\u538b\u76842\u500d\u4ee5\u4e0a\uff09\u65f6\uff0c\u53ef\u6000\u7591\u7eed\u6d41\u4e8c\u6781\u7ba1\u7684\u65b9\u5411\u9519\u8bef\u6216\u5b89\u88c5\u9057\u6f0f\u3002\u9700\u8981\u91cd\u65b0\u786e\u8ba4\u5e03\u7ebf\u3002\u5728\u7535\u8def\u4e0d\u901a\u7535\u7684\u72b6\u6001\u4e0b\uff0c\u4f7f\u7528\u4e07\u7528\u8868\u6d4b\u91cf\u4e8c\u6781\u7ba1\uff0c\u786e\u8ba4\u4e8c\u6781\u7ba1\u7684\u6781\u6027\u548c\u529f\u80fd\u3002<\/p>\n

    \u4f7f\u7528\u9f50\u7eb3\u4e8c\u6781\u7ba1\u4e32\u8054\u65f6<\/strong>
    \n\u5173\u65ad\u65f6\uff0c\\(V_{CE}\\)<\/span>\u4f1a\u7a33\u5b9a\u5728\u8bbe\u8ba1\u7684\u94b3\u4f4d\u7535\u538b\\(V_{clamp}\\)<\/span>\u9644\u8fd1\u3002\u5728\u4e32\u8054\u9f50\u7eb3\u4e8c\u6781\u7ba1\u7684\u914d\u7f6e\u4e2d\uff0c\u5173\u65ad\u65f6\u7684\\(V_{CE}\\)<\/span>\u5c06\u88ab\u94b3\u4f4d\u5728\u7535\u6e90\u7535\u538b+\u9f50\u7eb3\u7535\u538b+\u4e8c\u6781\u7ba1\u6b63\u5411\u7535\u538b\uff08\\(V_S\\)<\/span> + \\(V_Z\\)<\/span> + \\(V_F\\)<\/span> \uff09\u9644\u8fd1\u3002\u5982\u679c\u5927\u5e45\u8d85\u51fa\u8be5\u8303\u56f4\uff0c\u5219\u9700\u5bf9\u91cd\u65b0\u8bc4\u4f30\u9f50\u7eb3\u4e8c\u6781\u7ba1\u7684\u989d\u5b9a\u529f\u7387\u548c\u7535\u538b\u9009\u62e9\u3002\u9700\u6d4b\u91cf\u9f50\u7eb3\u7535\u6d41\uff0c\u8ba1\u7b97\u635f\u8017\uff0c\u5e76\u786e\u8ba4\u989d\u5b9a\u503c\u7684\u5408\u7406\u6027\u3002<\/p>\n

    \u5e76\u7528RC\u7f13\u51b2\u7535\u8def\u65f6<\/strong>
    \n\u5173\u65ad\u65f6\\(V_{CE}\\)<\/span>\u4e0a\u5347\u8d8b\u4e8e\u5e73\u7f13\uff0c\u9ad8\u9891\u5c16\u5cf0\u5f97\u5230\u6291\u5236\u3002\u5982\u679c\u6ce2\u5f62\u5448\u73b0\u5e73\u7f13\u7684\u66f2\u7ebf\uff0c\u8868\u660e\u7f13\u51b2\u7535\u8def\u751f\u6548\u3002RC\u7f13\u51b2\u7535\u8def\u7684\u6548\u679c\u5224\u5b9a\uff0c\u4e3b\u8981\u6307\u6807\u5e76\u975e\u201c\u632f\u94c3\u9891\u7387\u201d\u672c\u8eab\uff0c\u800c\u662f\u201c\u5c16\u5cf0\u632f\u5e45\u662f\u5426\u5145\u5206\u964d\u4f4e\u201d\u548c\u201c\u632f\u94c3\u662f\u5426\u5728\u6570\u4e2a\u5468\u671f\u5185\u8870\u51cf\u201d\u3002\u7531\u4e8e\u9891\u7387\u53d7\u5bc4\u751f\u5206\u91cf\uff08\u5e03\u7ebfL\u3001\u5bc4\u751fC\uff09\u7684\u5f71\u54cd\u5f88\u5927\uff0c\u56e0\u6b64\u5e94\u4ee5\u632f\u5e45\u548c\u8870\u51cf\u65f6\u95f4\u4e3a\u4e2d\u5fc3\u8fdb\u884c\u8bc4\u4f30\u3002<\/p>\n

    \u82e5\u4e0a\u5347\u6cbf\u4f9d\u7136\u9661\u5ced\uff0c\u6216\u6709\u6b8b\u7559\u5c16\u5cf0\uff0c\u53ef\u80fd\u662f\u56e0\u4e3aC\u503c\u504f\u5c0f\uff0c\u6216R\u503c\u8fc7\u5927\u3002\u53ef\u901a\u8fc7\u63d0\u9ad8C\u503c\u6216\u51cf\u5c0fR\u503c\u8fdb\u884c\u8c03\u6574\u3002\u4e00\u8fb9\u76d1\u6d4b\u6ce2\u5f62\u4e00\u8fb9\u53cd\u590d\u8c03\u6574\uff0c\u76f4\u5230\u83b7\u5f97\u53ef\u63a5\u53d7\u7684\u54cd\u5e94\u4e3a\u6b62\u3002\u8ba1\u7b97\u6700\u7ec8\u7684\u7535\u963b\u635f\u8017\uff0c\u786e\u8ba4\u989d\u5b9a\u503c\u7684\u5408\u7406\u6027\u3002<\/p>\n

    \u6ce2\u5f62\u89c2\u6d4b\u5bf9\u4e8e\u786e\u8ba4\u4e8c\u6781\u7ba1\u7684\u5de5\u4f5c\u60c5\u51b5\u548c\u9a8c\u8bc1\u566a\u58f0\u5bf9\u7b56\u7684\u6548\u679c\u5341\u5206\u6709\u6548\u3002\u901a\u8fc7\u4e0eDMM\u7684\u9759\u6001\u6d4b\u91cf\u76f8\u7ed3\u5408\uff0c\u53ef\u4ee5\u52a8\u6001\u9a8c\u8bc1\u8bbe\u8ba1\u7684\u5408\u7406\u6027\u3002\u53e6\u5916\uff0c\u5c06\u6d4b\u91cf\u7ed3\u679c\u8bb0\u5f55\u4e0b\u6765\uff0c\u5728\u91cf\u4ea7\u65f6\u7684\u6545\u969c\u6392\u67e5\u4e2d\u4e5f\u4f1a\u5927\u6709\u5e2e\u52a9\u3002<\/p>\n

    \u4f4e\u8fb9\u5f00\u5173\u7535\u8def\u9700\u8981\u5927\u7535\u6d41\u3001\u9ad8\u6548\u7387\u65f6\u7684\u65b9\u6848\u9009\u62e9\u5224\u65ad<\/h2>\n

    \u5f53\u9a71\u52a8\u7535\u6d41\u8d85\u8fc71A\u6216\u9700\u8981\u591a\u901a\u9053\u9a71\u52a8\u65f6\uff0c\u5e94\u8003\u8651\u6539\u7528MOSFET\u6216\u6676\u4f53\u7ba1\u9635\u5217\u3002<\/p>\n

    \u66ff\u6362\u4e3a\u6676\u4f53\u7ba1\u9635\u5217\uff08\u4f8b\u5982\uff1a\u591a\u901a\u9053\u4f4e\u8fb9\u9a71\u52a8\u5668\uff09\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u4e0d\u80fd\u4ee5\u201c\u5355\u4e2aNPN\u7684\u56fa\u6709\u601d\u7ef4\u8fdb\u884c\u66ff\u6362\u201d\uff0c\u5426\u5219\u5bb9\u6613\u5728\u635f\u8017\u548c\u5e03\u7ebf\u65b9\u9762\u51fa\u73b0\u95ee\u9898\u3002\u5e38\u89c1\u7684\u6676\u4f53\u7ba1\u9635\u5217\u6709\u8fbe\u6797\u987f\u7ed3\u6784\uff0c\u8be5\u7ed3\u6784\u4e2d\\(V_{CE(sat)}\\)<\/span>\u6bd4\u5355\u4e2aNPN\u6676\u4f53\u7ba1\u7684\u66f4\u5bb9\u6613\u53d8\u5927\u3002\u5f53\\(V_{CE(sat)}\\)<\/span>\u589e\u52a0\u65f6\uff0c\u5373\u4f7f\u5728\u76f8\u540c\u7684\\(I_C\\)<\/span>\u6761\u4ef6\u4e0b\uff0c\u635f\u8017P \u2252 \\(V_{CE(sat)}\\)<\/span>\u00d7\\(I_C\\)<\/span>\u00d7Duty\u4e5f\u4f1a\u589e\u5927\uff0c\u76f4\u63a5\u5bfc\u81f4\u53d1\u70ed\u91cf\u589e\u52a0\uff0c\u56e0\u6b64\u7279\u522b\u662f\u5728\u8fde\u7eed\u9a71\u52a8\u6216\u591a\u901a\u9053\u540c\u65f6\u5bfc\u901a\u7684\u60c5\u51b5\u4e0b\uff0c\u9700\u8981\u5bf9\u5305\u62ec\u201c\u5c01\u88c5\u6574\u4f53\u7684\u5bb9\u8bb8\u635f\u8017\u201d\u548c\u201c\u7535\u8def\u677f\u6563\u70ed\u6761\u4ef6\u201d\u5728\u5185\u7684\u60c5\u51b5\u8fdb\u884c\u5168\u9762\u786e\u8ba4\u3002\u53e6\u5916\uff0c\u5185\u7f6e\u94b3\u4f4d\u4e8c\u6781\u7ba1\u7684\u4ea7\u54c1\uff0c\u5176COM\u5f15\u811a\u7684\u8fde\u63a5\u76ee\u6807\uff08\u8bbe\u8ba1\u4e3a\u56de\u63a5\u81f3\u4f55\u5904\uff09\u53ef\u80fd\u56e0\u4ea7\u54c1\u800c\u5f02\u3002\u5982\u679c\u65e8\u5728\u4fdd\u62a4\u611f\u6027\u8d1f\u8f7d\uff0c\u8bf7\u52a1\u5fc5\u901a\u8fc7\u6280\u672f\u89c4\u683c\u4e66\u786e\u8ba4\u5185\u7f6e\u4e8c\u6781\u7ba1\u7684\u56de\u63a5\u7aef\u4e0e\u8d1f\u8f7d\u7535\u6e90\u7684\u5173\u7cfb\u662f\u5426\u4e0e\u8bbe\u8ba1\u610f\u56fe\u4e00\u81f4\uff0c\u4ee5\u907f\u514d\u56e0\u9519\u8bef\u5e03\u7ebf\u5bfc\u81f4\u4fdd\u62a4\u5931\u6548\u3002<\/p>\n

    \u5fae\u63a7\u5236\u5668\u7535\u6d41\u4e0d\u8db3\u548c\u591a\u901a\u9053\u9a71\u52a8\u65f6\u4f7f\u7528\u6676\u4f53\u7ba1\u9635\u5217<\/h3>\n

    \u4f7f\u7528\u5355\u4e2aNPN\u6676\u4f53\u7ba1\u8fdb\u884c\u8bbe\u8ba1\u8f83\u96be\u5b9e\u73b0\u8bbe\u8ba1\u76ee\u6807\u65f6\uff0c\u53ef\u8003\u8651\u91c7\u7528\u6676\u4f53\u7ba1\u9635\u5217\u6216\u6570\u5b57\u6676\u4f53\u7ba1\u3002<\/p>\n

    \u5fae\u63a7\u5236\u5668\u7535\u6d41\u4e0d\u8db3\u65f6<\/strong>
    \n\u6309\u7167\\(\u03b2_{forced}\\)<\/span> = 10\u201320\u8fdb\u884c\u8bbe\u8ba1\u65f6\uff0c\\(I_B\\)<\/span>\u4f1a\u53d8\u5927\u3002\\(I_B\\)<\/span>\u63a5\u8fd1\u6216\u8d85\u51fa\u5fae\u63a7\u5236\u5668I\/O\u7535\u6d41\u4e0a\u9650\u65f6\uff0c\u4ec5\u51ed\u5355\u4e2aNPN\u6676\u4f53\u7ba1\u96be\u4ee5\u89e3\u51b3\u95ee\u9898\u3002\u5728\u786e\u5b9a\u5668\u4ef6\u4e4b\u524d\uff0c\u5e94\u5148\u8ba1\u7b97\u603bGPIO\u7535\u6d41\u9884\u7b97\u3002<\/p>\n

    \u4f8b\u5982\uff0c3.3V\u5fae\u63a7\u5236\u5668\uff0c\u5f53\\(I_C\\)<\/span> = 200 mA\u3001\\(\u03b2_{forced}\\)<\/span> = 10\u65f6\uff0c\u9700\u8981\\(I_B\\)<\/span> = 20 mA\u3002\u5982\u679cI\/O\u4e0a\u9650\u4e3a1mA\uff0c\u5219\u8be5\u8bbe\u8ba1\u65e0\u6cd5\u6210\u7acb\u3002\u5373\u4f7f\u5c06\\(\u03b2_{forced}\\)<\/span>\u589e\u52a0\u523020\uff0c\\(I_B\\)<\/span>\u4ecd\u4e3a10mA\uff0c\u6ca1\u6709\u88d5\u91cf\u3002\u6e29\u5ea6\u6ce2\u52a8\u548c\u5668\u4ef6\u504f\u5dee\u53ef\u80fd\u5c06\u5176\u63a8\u5165\u5371\u9669\u533a\u57df\u3002<\/p>\n

    \u6676\u4f53\u7ba1\u9635\u5217\u548c\u6570\u5b57\u6676\u4f53\u7ba1\u5185\u90e8\u5177\u6709\u57fa\u6781\u7535\u963b\u6216\u8fbe\u6797\u987f\u8fde\u63a5\uff0c\u80fd\u591f\u4ee5\u8f83\u5c0f\u7684\u8f93\u5165\u7535\u6d41\u5904\u7406\u8f83\u5927\u7684\u96c6\u7535\u6781\u7535\u6d41\u3002\u8f93\u5165\u7535\u6d41\u6570mA\u4ee5\u4e0b\u5373\u53ef\u9a71\u52a8\\(I_C\\)<\/span> = 200\u2013500 mA\u7684\u4ea7\u54c1\uff0c\u53ef\u5927\u5e45\u51cf\u8f7b\u5fae\u63a7\u5236\u5668\u7684\u8d1f\u62c5\u3002\u5bf9\u4e8e200\uff5e500mA\u7684\u8f93\u51fa\u80fd\u529b\uff0c\u5178\u578b\u7684\u8f93\u5165\u7535\u6d41\u9700\u6c42\u7ea6\u4e3a1\uff5e5mA\u3002<\/p>\n

    \u591a\u901a\u9053\u9a71\u52a8\u65f6<\/strong>
    \n\u5f53\u540c\u65f6\u9a71\u52a8\u591a\u4e2a\u8d1f\u8f7d\u65f6\uff0c\u82e5\u5355\u72ec\u914d\u7f6e\u5355\u4e2aNPN\u6676\u4f53\u7ba1\uff0c\u4f1a\u5bfc\u81f4\u5143\u5668\u4ef6\u6570\u91cf\u53ca\u5e03\u7ebf\u589e\u52a0\u3002\u6676\u4f53\u7ba1\u9635\u5217\u5728\u4e00\u4e2a\u5c01\u88c5\u4e2d\u96c6\u6210\u4e86\u591a\u4e2a\u901a\u9053\uff0c\u53ef\u51cf\u5c11\u5b89\u88c5\u9762\u79ef\u5e76\u964d\u4f4e\u5e03\u7ebf\u7684\u590d\u6742\u6027\u3002<\/p>\n\n\n\n\n\n\n
    \u9879\u76ee<\/th>\n\u5355\u4e2aNPN \u00d7 8<\/th>\n\u6676\u4f53\u7ba1\u9635\u5217\uff088\u901a\u9053\uff09<\/th>\n<\/tr>\n
    \u5143\u5668\u4ef6\u6570\u91cf<\/td>\n8\u4e2a\u6676\u4f53\u7ba1 + 8\u4e2a\u7535\u963b<\/td>\n\u9635\u5217IC 1\u4e2a<\/td>\n<\/tr>\n
    \u5b89\u88c5\u9762\u79ef<\/td>\n\u5927\uff0816\u4e2a\u5143\u5668\u4ef6\u7684\u4f4d\u7f6e\uff09<\/td>\n\u5c0f\uff081\u4e2aIC\u7684\u4f4d\u7f6e\uff09<\/td>\n<\/tr>\n
    \u901a\u9053\u95f4\u504f\u5dee<\/td>\n\u4e2a\u522b\u5143\u5668\u4ef6\u7684\u504f\u5dee\uff08\\(h_{FE}\\)<\/span> \u00b150%\uff09<\/td>\n\u5728\u9635\u5217\u5185\u7edf\u4e00\uff08\\(h_{FE}\\)<\/span> \u00b110%\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u6676\u4f53\u7ba1\u9635\u5217\u5177\u6709\u901a\u9053\u95f4\u7684\u7279\u6027\u5dee\u5f02\u5c0f\u3001\u6613\u4e8e\u5747\u5300\u9a71\u52a8\u591a\u4e2a\u8d1f\u8f7d\u7684\u4f18\u70b9\u3002\u4e0d\u8fc7\uff0c\u4e00\u65e6\u5176\u4e2d\u4e00\u4e2a\u901a\u9053\u53d1\u751f\u6545\u969c\uff0c\u5c31\u9700\u8981\u66f4\u6362\u6574\u4f53\uff0c\u56e0\u6b64\u5728\u53ef\u7ef4\u62a4\u6027\u65b9\u9762\uff0c\u5355\u4f53NPN\u53ef\u80fd\u66f4\u5177\u4f18\u52bf\u3002\u9009\u62e9\u65b9\u6848\u65f6\uff0c\u9700\u6743\u8861\u8003\u8651\u66f4\u6362\u6210\u672c\u548c\u524d\u671f\u6210\u672c\u7684\u524a\u51cf\u3002<\/p>\n

    \u9009\u62e9\u6676\u4f53\u7ba1\u9635\u5217\u7684\u8bc4\u4f30\u6807\u51c6\u4e3a\uff1aI\/O\u7535\u6d41\u4e0d\u8db3\u6216\u901a\u9053\u6570\u8fbe4\u4e2a\u4ee5\u4e0a\u3002\u5f53\u91cd\u89c6\u8bbe\u8ba1\u7b80\u5316\u548c\u5b9e\u9645\u5b89\u88c5\u6548\u7387\u65f6\uff0c\u53ef\u8003\u8651\u91c7\u7528\u6676\u4f53\u7ba1\u9635\u5217\u3002\u8fd8\u9700\u8981\u786e\u8ba4\u9635\u5217\u7684\u70ed\u7279\u6027\u652f\u6301\u6700\u5927\u5360\u7a7a\u6bd4\u4e0b\u7684\u591a\u901a\u9053\u540c\u65f6\u5de5\u4f5c\u3002<\/p>\n

    \u8d85\u8fc71A\u3001\u9ad8\u6548\u7387\u3001\u9ad8\u901f\u5f00\u5173\u65f6\u8003\u8651MOSFET+\u9a71\u52a8\u5668IC<\/h3>\n

    \u5728\u96c6\u7535\u6781\u7535\u6d41\u8d85\u8fc71A\uff0c\u6216\u6548\u7387\u548c\u53d1\u70ed\u6210\u4e3a\u5236\u7ea6\u56e0\u7d20\u65f6\uff0c\u66f4\u6539\u4e3aN\u6c9f\u9053MOSFET\u662f\u6709\u6548\u7684\u89e3\u51b3\u65b9\u6848\u3002MOSFET\u5728\u5927\u7535\u6d41\u5e94\u7528\u4e2d\u6027\u80fd\u8868\u73b0\u4f18\u5f02\uff0c\u5176\u4f4e\u5bfc\u901a\u7535\u963b\u53ef\u63d0\u5347\u6548\u7387\u3002\u6805\u6781\u7535\u538b\u9608\u503c\u548c\u7279\u6027\u5728N\u578b\u548cP\u578b\u5668\u4ef6\u4e2d\u6709\u6240\u4e0d\u540c\uff0cN\u578bMOSFET\u901a\u5e38\u9700\u8981\u76f8\u5bf9\u6e90\u6781\u65bd\u52a0\u6b63\u6805\u6781\u7535\u538b\uff0c\u7531\u6f0f\u6781\u5f15\u811a\u627f\u8f7d\u5f00\u5173\u7535\u6d41\u3002<\/p>\n

    \u635f\u8017\u6bd4\u8f83<\/strong>
    \n\u4e0b\u9762\u4f7f\u7528\u5b9e\u9645\u5668\u4ef6\u53c2\u6570\u6bd4\u8f83NPN\u6676\u4f53\u7ba1\u4e0eMOSFET\u7684\u635f\u8017\u3002
    \nNPN\u6676\u4f53\u7ba1\u7684\u635f\u8017\u7528\\(V_{CE(sat)}\\)<\/span>\u548c\\(I_C\\)<\/span>\u8ba1\u7b97\uff1a<\/p>\n

    \\(P_{NPN}(\u2248V_{CE}(sat)\\times I_C\\times Duty\\)<\/span><\/p>\n

    MOSFET\u7684\u635f\u8017\u7528\u5bfc\u901a\u7535\u963b\\(R_{DS(on)}\\)<\/span>\u548c\\(I_C\\)<\/span>\u7684\u5e73\u65b9\u8ba1\u7b97\uff1a<\/p>\n

    \\(P_{MOS}(\u2248R_{DS}(sat)\\times I_C^2\\times Duty\\)<\/span><\/p>\n

    \u4ee5\\(I_C\\)<\/span> = 1 A\u4e3a\u4f8b\u8fdb\u884c\u6bd4\u8f83\uff1a<\/p>\n\n\n\n\n\n
    \u5668\u4ef6<\/th>\n\u53c2\u6570<\/th>\n\u635f\u8017\uff08Duty = 1\uff09<\/th>\n<\/tr>\n
    NPN<\/td>\n\\(V_{CE(sat)}\\)<\/span> = 0.2 V<\/td>\n0.2 \u00d7 1 = 0.2 W<\/td>\n<\/tr>\n
    MOSFET<\/td>\n\\(R_{DS(on)}\\)<\/span> = 0.1 \u03a9<\/td>\n0.1 \u00d7 12<\/sup> = 0.1 W<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u635f\u8017\u7684\u5206\u754c\u70b9\uff0c\u5728\u4f30\u7b97\u4e2d\u5927\u81f4\u4e0a\u7531\\(V_{CE(sat)}\\)<\/span>\u548c\\(R_{DS(on)}\\)<\/span>\u51b3\u5b9a\u3002\u5728\u76f8\u540c\u7535\u6d41I\u4e0b\u6bd4\u8f83\u65f6\uff0c\u53cc\u6781\u6676\u4f53\u7ba1\uff08BJT\uff09\u7684\\(P_{NPN}\\)<\/span> \u2252 \\(V_{CE(sat)}\\)<\/span>\u00d7\\(I\\)<\/span>\u3001MOSFET\u7684\\(P_{MOS}\\)<\/span> \u2252 \\(R_{DS(on)}\\)<\/span>\u00d7\\(I^2\\)<\/span>\u3002\u56e0\u6b64\uff0c\\(R_{DS(on)}\\)<\/span>\u00d7\\(I\\)<\/span> \u2276 \\(V_{CE(sat)}\\)<\/span>) \u6210\u4e3a\u5224\u65ad\u4f18\u52a3\u7684\u57fa\u51c6\uff08\\(I\\)<\/span> \u2276 \\(V_{CE(sat)}\\)<\/span> \/ \\(R_{DS(on)}\\)<\/span>\uff09\u3002\u4f8b\u5982\\(V_{CE(sat)}\\)<\/span>=0.2 V\u3001\\(R_{DS(on)}\\)<\/span>=0.1 \u03a9\u65f6\uff0c\u5206\u754c\u70b9\u7ea6\u4e3a2A\u3002\u7136\u800c\u5b9e\u9645\u4e0a\uff0cBJT\u7684\\(V_{CE(sat)}\\)<\/span>\u4f1a\u56e0\u4e3a\u7535\u6d41\u589e\u5927\u6216\u57fa\u6781\u9a71\u52a8\u6761\u4ef6\u800c\u5bb9\u6613\u6076\u5316\uff0cMOSFET\u7684\\(R_{DS(on)}\\)<\/span>\u4e5f\u4f1a\u968f\u6e29\u5ea6\u4e0a\u5347\u800c\u589e\u52a0\u3002\u5f53\u8bbe\u8ba1\u7535\u6d41\u8f83\u5927\u65f6\uff0c\u5e94\u9009\u62e9\u76f8\u5bf9\u4e8e\u76ee\u6807\u7535\u6d41\\(R_{DS(on)}\\)<\/span>\u8db3\u591f\u5c0f\uff08\u4f8b\u5982\u6570\u5341m\u03a9\u4ee5\u4e0b\uff09\u7684\u903b\u8f91\u7535\u5e73MOSFET\uff0c\u5e76\u4ece\u5305\u542b\u6e29\u5347\u5728\u5185\u7684\u635f\u8017\u89d2\u5ea6\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n

    \u9ad8\u901f\u5f00\u5173\u65f6<\/strong>
    \nPWM\u9a71\u52a8\u6216\u9ad8\u9891\u5f00\u5173\uff08\u6570\u5341kHz\u4ee5\u4e0a\uff09\u5e94\u7528\u4e2d\uff0cMOSFET\u80fd\u591f\u5c06\u5f00\u5173\u635f\u8017\u6291\u5236\u5f97\u66f4\u4f4e\u3002NPN\u6676\u4f53\u7ba1\u5728\u57fa\u6781\u7535\u8377\u7684\u79ef\u84c4\u548c\u91ca\u653e\u4e0a\u9700\u8981\u65f6\u95f4\uff0c\u5bfc\u81f4\u5bfc\u901a\u548c\u5173\u65ad\u7684\u8fc7\u6e21\u65f6\u95f4\u8f83\u957f\uff08\u5178\u578b\u503c\u4e3a1~10\u00b5s\uff09\u3002\u7531\u4e8eMOSFET\u901a\u8fc7\u6805\u6781\u7535\u8377\u7684\u5145\u653e\u7535\u8fdb\u884c\u63a7\u5236\uff0c\u56e0\u6b64\u9002\u7528\u4e8e\u9ad8\u901f\u5f00\u5173\uff08\u5178\u578b\u8fc7\u6e21\u65f6\u95f4\u4e3a10~100ns\uff09\u3002\u5f00\u5173\u635f\u8017\\(P_{SW}\\)<\/span> \u2252 0.5 \u00d7 \\(V_{DS}\\)<\/span> \u00d7 \\(I_D\\)<\/span> \u00d7 (\\(t_{rise}\\)<\/span> + \\(t_{fall}\\)<\/span>) \u00d7 \\(f\\)<\/span>\u572810kHz\u4ee5\u4e0a\u7684\u5f00\u5173\u9891\u7387\u4e0b\u5360\u4e3b\u5bfc\u5730\u4f4d\u3002<\/p>\n

    \u6805\u6781\u9a71\u52a8\u7535\u8def\u7684\u5fc5\u8981\u6027<\/strong>
    \nMOSFET\u7531\u6805\u6781\u7535\u538b\uff08\u6805-\u6e90\u7535\u538b\\(V_{GS}\\)<\/span>\uff09\u8fdb\u884c\u63a7\u5236\u3002\u5fae\u63a7\u5236\u5668\u7684\u8f93\u51fa\u4e3a3.3V\/5V\u65f6\uff0c\u53ea\u8981\u9009\u62e9\u5728\u8be5\u7535\u538b\u6761\u4ef6\u4e0b\u4fdd\u8bc1\u4e86\\(R_{DS(on)}\\)<\/span>\u7684\u903b\u8f91\u7535\u5e73MOSFET\uff0c\u5728\u4f4e\u9891\u5e94\u7528\uff08\u5982\u7ee7\u7535\u5668\u7b49\uff09\u4e2d\uff0c\u5927\u591a\u76f4\u63a5\u8fde\u63a5GPIO\u5373\u53ef\u6b63\u5e38\u5de5\u4f5c\u3002\u53e6\u4e00\u65b9\u9762\uff0c\u5f53PWM\u9891\u7387\u8f83\u9ad8\u3001\u6805\u6781\u7535\u8377\\(Q_G\\)<\/span>\u8f83\u5927\u3001\u5e0c\u671b\u901a\u8fc7\u7f29\u77ed\u4e0a\u5347\/\u4e0b\u964d\u65f6\u95f4\u6765\u964d\u4f4e\u5f00\u5173\u635f\u8017\u65f6\uff0c\u91c7\u7528\u6805\u6781\u9a71\u52a8\u5668IC\u4ee5\u8f83\u5927\u7535\u6d41\u5bf9\u6805\u6781\u8fdb\u884c\u5145\u653e\u7535\u7684\u914d\u7f6e\u662f\u884c\u4e4b\u6709\u6548\u7684\u65b9\u6848\uff08\u6805\u6781\u9a71\u52a8\u7535\u538b\u7531\u9a71\u52a8\u5668IC\u7684\u7535\u6e90\u51b3\u5b9a\uff09\u3002\u5f53\u7136\uff0c\u5e38\u89c1\u7684\u9519\u8bef\u662f\u5728\u672a\u786e\u8ba4\u6805\u6781\u9608\u503c\u7535\u538b\u7684\u60c5\u51b5\u4e0b\uff0c\u5c31\u8bd5\u56fe\u7528\u5fae\u63a7\u5236\u5668\u76f4\u63a5\u9a71\u52a8\u6807\u51c6MOSFET\uff0c\u8fd9\u4f1a\u5bfc\u81f4\u4e0d\u5b8c\u5168\u5f00\u5173\u548c\u8fc7\u5ea6\u53d1\u70ed\u3002<\/p>\n

    \u903b\u8f91\u7535\u5e73MOSFET\u662f\u6307\u5728\\(V_{GS}\\)<\/span> = 4.5 V\u5de6\u53f3\u5373\u53ef\u5145\u5206\u5bfc\u901a\u7684\u4ea7\u54c1\u30025V\u5fae\u63a7\u5236\u5668\u53ef\u4ee5\u76f4\u63a5\u9a71\u52a8\u30023.3V\u7684\u5fae\u63a7\u5236\u5668\u5219\u53ef\u80fd\u65e0\u6cd5\u5b8c\u5168\u5bfc\u901a\u3002\u6805\u6781\u9a71\u52a8\u5668IC\u5c06\u4f4e\u7535\u538b\u8f93\u5165\u5347\u538b\uff0c\u4ee5\u786e\u4fdd\u53ef\u9760\u5730\u9a71\u52a8MOSFET\u7684\u6805\u6781\uff08\u5178\u578b\u6805\u6781\u9a71\u52a8\u7535\u538b\u4e3a10~12V\uff09\u3002\\(V_{GS(th)}\\)<\/span>\u4e3a\u201c\u5fae\u5c0f\u7535\u6d41\u5f00\u59cb\u6d41\u52a8\u7684\u7535\u538b\u201d\uff0c\u4e0d\u80fd\u4f5c\u4e3a\u5f00\u5173\u5e94\u7528\u4e2d\u201c\u5145\u5206\u5bfc\u901a\u201d\u6761\u4ef6\u7684\u6307\u6807\u3002\\(R_{DS(on)}\\)<\/span>\u662f\u9644\u5e26\\(V_{GS}\\)<\/span>\u6761\u4ef6\u89c4\u5b9a\u7684\uff0c\u56e0\u6b64\u9700\u786e\u8ba4\u6240\u9700\u6805\u6781\u7535\u538b\uff08\u4f8b\u59823.3V\/4.5V\/10V\uff09\u4e0b\u7684\\(R_{DS(on)}\\)<\/span>\u4fdd\u8bc1\u503c\uff0c\u5e76\u9a8c\u8bc1\u901a\u5165\u9884\u671f\u7684\u7535\u6d41\\(I_D\\)<\/span>\u65f6\uff0c\u635f\u8017 P \u2248 \\(R_{DS(on)}\\)<\/span> \u00d7 \\(I_{D^2}\\)<\/span> \u00d7 Duty\u548c\u6e29\u5347\u662f\u5426\u5728\u5bb9\u8bb8\u8303\u56f4\u5185\u3002<\/p>\n

    \u4eceNPN\u6539\u7528MOSFET\u7684\u5224\u65ad\u57fa\u51c6<\/strong>
    \n\u5f53\u7b26\u5408\u4ee5\u4e0b\u4efb\u4e00\u89d2\u5ea6\u7684\u6761\u4ef6\u65f6\uff0c\u5c06NPN\u6676\u4f53\u7ba1\u66ff\u6362\u4e3aMOSFET\u90fd\u662f\u884c\u4e4b\u6709\u6548\u7684\u3002<\/p>\n\n\n\n\n\n\n\n
    \u89d2\u5ea6<\/th>\n\u53c2\u8003\u6807\u51c6<\/th>\n\u8865\u5145\u8bf4\u660e<\/th>\n<\/tr>\n
    \u7535\u6d41<\/td>\n\\(I_C\\)<\/span>\u8fbe\u52301A\u4ee5\u4e0a<\/td>\n\u867d\u7136\u6709\u65f6\u4f7f\u7528BJT\u4e5f\u80fd\u6210\u7acb\uff0c\u4f46\u4ece\u53d1\u70ed\u548c\u6548\u7387\u7684\u89d2\u5ea6\u6765\u770b\uff0cMOSFET\u66f4\u5bb9\u6613\u5c55\u73b0\u4f18\u52bf<\/td>\n<\/tr>\n
    \u635f\u8017\u548c\u70ed\u8bbe\u8ba1<\/td>\nBJT\u7684\u635f\u8017\u63a5\u8fd1\/\u8d85\u8fc7\u5bb9\u8bb8\u635f\u8017\u768480%<\/td>\n\u9700\u8981\u786e\u4fdd\u5305\u62ec\u73af\u5883\u6e29\u5ea6\u3001\u6563\u70ed\u6761\u4ef6\uff08\u7535\u8def\u677f\u3001\u5916\u58f3\uff09\u5728\u5185\uff0c\u5728\u6700\u5dee\u6761\u4ef6\u4e0b\u7684\u6e29\u5ea6\u88d5\u91cf<\/td>\n<\/tr>\n
    \u5f00\u5173\u9891\u7387<\/td>\n10 kHz \u4ee5\u4e0a\uff08PWM\u7b49\uff09<\/td>\nBJT\u6613\u53d7\u5b58\u50a8\u7535\u8377\u5f71\u54cd\u800c\u5bfc\u81f4\u5f00\u5173\u635f\u8017\u589e\u52a0\uff0c\u56e0\u6b64MOSFET\u901a\u5e38\u66f4\u5177\u4f18\u52bf<\/td>\n<\/tr>\n
    \u6548\u7387\u8981\u6c42<\/td>\n\u7535\u6c60\u9a71\u52a8\u3001\u70ed\u91cf\u9650\u5236\u4e25\u683c\u3001\u5fc5\u987b\u4f4e\u635f\u8017<\/td>\n\u9664\u4e86\u9009\u62e9\u903b\u8f91\u7535\u5e73MOSFET\u5916\uff0c\u5fc5\u8981\u65f6\u8fd8\u9700\u8981\u63a2\u8ba8\u4f7f\u7528\u6805\u6781\u9a71\u52a8\u5668IC<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u5f53\u5728PWM\u7b49\u63a7\u5236\u65b9\u5f0f\u4e0b\u5f00\u5173\u9891\u7387\u5347\u9ad8\u65f6\uff0c\u4f7fBJT\u8fdb\u5165\u201c\u6df1\u5ea6\u9971\u548c\u201d\u672c\u8eab\u4f1a\u5e26\u6765\u5f0a\u7aef\u3002BJT\u5728\u9971\u548c\u72b6\u6001\u4e0b\uff0c\u57fa\u6781\u533a\u57df\u5bb9\u6613\u79ef\u84c4\u7535\u8377\uff0c\u5173\u65ad\u65f6\u9700\u8981\u65f6\u95f4\u6765\u62bd\u53d6\u8fd9\u4e9b\u7535\u8377\uff0c\u4ece\u800c\u53ef\u80fd\u5bfc\u81f4\u4e0b\u964d\u5ef6\u8fdf\u6216\u5f00\u5173\u635f\u8017\u589e\u52a0\uff08\u5373\u6240\u8c13\u7684\u201c\u7535\u8377\u5b58\u50a8\u6548\u5e94\u201d\uff09\u3002<\/p>\n

    \u5f53\u5b58\u5728\u8fd9\u7c7b\u95ee\u9898\u65f6\uff0c\u5bf9\u7b56\u4e3b\u8981\u5206\u4e3a\u4e24\u4e2a\u65b9\u5411\u3002\u4e00\u4e2a\u5c31\u662f\u6539\u7528MOSFET\uff0c\u8fd9\u662f\u76f4\u63a5\u83b7\u53d6\u4f4e\u635f\u8017\u548c\u9ad8\u901f\u5f00\u5173\u7684\u65b9\u6cd5\u3002\u53e6\u4e00\u4e2a\u662f\u8fd8\u662f\u4f7f\u7528BJT\uff0c\u4f46\u8c03\u6574\u8bbe\u8ba1\u4f7f\u5176\u201c\u96be\u4ee5\u8fdb\u5165\u6df1\u5ea6\u9971\u548c\u201d\uff0c\u4f8b\u5982\u4f18\u5316\u57fa\u6781\u7535\u6d41\u7684\u4f9b\u5e94\u65b9\u5f0f\uff08\\(\u03b2_{forced}\\)<\/span>\uff09\u4ee5\u53ca\u4f18\u5316\u5173\u65ad\u65f6\u7684\u57fa\u6781\u653e\u7535\u8def\u5f84\uff08\u53ef\u9760\u62c9\u4f4e\u57fa\u6781\u7684\u7535\u8def\u7ed3\u6784\uff09\u3002\u9700\u6839\u636ePWM\u7684\u9891\u7387\u3001\u5360\u7a7a\u6bd4\u548c\u6240\u9700\u6548\u7387\uff0c\u901a\u8fc7\u635f\u8017\u4f30\u7b97\u548c\u6ce2\u5f62\u89c2\u6d4b\u4e24\u65b9\u9762\u6765\u5224\u65ad\u662f\u4f18\u5148\u8003\u8651BJT\u7684\u7b80\u6d01\u6027\uff0c\u8fd8\u662f\u4f18\u5148\u8003\u8651MOSFET\u7684\u6548\u7387\u3002<\/p>\n

    \u6539\u7528MOSFET\u5728\u635f\u8017\u548c\u6548\u7387\u65b9\u9762\u66f4\u6709\u76ca\u5904\u3002\u4f46\u7531\u4e8e\u9700\u8981\u6805\u6781\u9a71\u52a8\u7535\u8def\uff0c\u56e0\u6b64\u7535\u8def\u7ed3\u6784\u548c\u5143\u5668\u4ef6\u6570\u91cf\u4f1a\u589e\u52a0\u3002\u5177\u4f53\u8981\u6839\u636e\u8bbe\u8ba1\u9700\u6c42\uff0c\u6743\u8861NPN\u6676\u4f53\u7ba1\u7684\u7b80\u5355\u6027\u4e0eMOSFET\u7684\u9ad8\u6548\u6027\u6765\u505a\u9009\u62e9\u3002\u4ece\u7535\u6e90\u7ebf\u8def\u7684\u5f00\uff0f\u5173\u63a7\u5236\u89d2\u5ea6\u770b\uff0c\u5efa\u8bae\u540c\u65f6\u53c2\u8003\u201c\u8d1f\u8f7d\u5f00\u5173\u201d\u7684\u76f8\u5173\u8bb2\u89e3\u3002\u5982\u679c\u8fd8\u662f\u65e0\u6cd5\u4f5c\u51fa\u5224\u65ad\uff0c\u5219\u5728\u539f\u578b\u9636\u6bb5\u5bf9\u4e24\u79cd\u65b9\u5f0f\u5206\u522b\u8fdb\u884c\u6d4b\u8bd5\uff0c\u5e76\u6839\u636e\u5b9e\u6d4b\u7ed3\u679c\u8fdb\u884c\u5224\u65ad\u3002<\/p>\n

    \u4f4e\u8fb9\u5f00\u5173\u7535\u8def\u8bbe\u8ba1\u603b\u7ed3\uff08\u8bbe\u8ba1\u6b65\u9aa4\u56de\u987e\u4e0e\u4e0b\u4e00\u6b65\u884c\u52a8\uff09<\/h2>\n

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