{"id":323,"date":"2017-12-10T07:02:49","date_gmt":"2017-12-10T07:02:49","guid":{"rendered":""},"modified":"2017-12-10T15:03:40","modified_gmt":"2017-12-10T07:03:40","slug":"%e5%86%85%e7%bd%ae%e8%82%96%e7%89%b9%e5%9f%ba%e4%ba%8c%e6%9e%81%e7%ae%a1%e7%9a%84mosfet%e5%8f%af%e6%8f%90%e9%ab%98%e5%ba%94%e7%94%a8%e6%80%a7%e8%83%bd","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=323","title":{"rendered":"\u5185\u7f6e\u8096\u7279\u57fa\u4e8c\u6781\u7ba1\u7684MOSFET\u53ef\u63d0\u9ad8\u5e94\u7528\u6027\u80fd"},"content":{"rendered":"
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\n\t\t\t <\/div>\n<\/p><\/div>\n<\/header>\n
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\n\t\t\t\t\t\t <\/div>\n<\/p><\/div>\n
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\n\t\t\t\t\t\t\t\u5f53\u4e00\u4e2a\u529f\u7387MOSFET\u88ab\u7528\u5728\u7535\u6865\u62d3\u6251\u6216\u7528\u4f5c\u7535\u6e90\u4e8c\u6b21\u4fa7\u540c\u6b65\u6574\u6d41\u65f6\uff0c\u4f53\u6f0f\u4e8c\u6781\u7ba1\u7684\u7279\u6027\u53ca\u8d28\u91cf\u56e0\u5b50\u5c06\u53d8\u5f97\u975e\u5e38\u91cd\u8981\u3002\u5f53\u9700\u8981Qrr<\/span>\u6570\u503c\u5f88\u4f4e\u7684\u8f6f\u53cd\u5411\u6062\u590d\u65f6\uff0c\u96c6\u6210\u8096\u7279\u57fa\u4e8c\u6781\u7ba1\u7684\u65b060V“F7”\u529f\u7387MOSFET\u786e\u4fdd\u80fd\u6548\u548c\u6362\u5411\u6027\u80fd\u66f4\u52a0\u51fa\u8272\u3002<\/p>\n<\/p><\/div>\n<\/p><\/div>\n

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\n\t\t\t\t\t\t\t\u5728\u540c\u6b65\u6574\u6d41\u548c\u7535\u6865\u7ed3\u6784\u4e2d\uff0cRDSon<\/span>\u548cQg<\/span>\u4e24\u4e2a\u53c2\u6570\u5e76\u4e0d\u662f\u5bf9\u529f\u7387MOSFET\u7684\u552f\u4e00\u8981\u6c42\uff0c\u5b9e\u9645\u4e0a\uff0c\u672c\u5f81\u4f53\u6f0f\u4e8c\u6781\u7ba1\u7684\u52a8\u6001\u7279\u6027\u5bf9MOSFET\u6574\u4f53\u6027\u80fd\u5f71\u54cd\u5f88\u5927\u3002\u4f53\u6f0f\u4e8c\u6781\u7ba1\u7684\u6b63\u5411\u538b\u964d(VF,diode<\/span>)\u5f71\u54cd\u5f00\u5173\u5728\u7eed\u6d41\u671f\u95f4(\u5f00\u5173\u5904\u4e8e\u5173\u65ad\u72b6\u6001\uff0c\u7535\u6d41\u4ece\u6e90\u6781\u7ecf\u672c\u5f81\u4e8c\u6781\u7ba1\u6d41\u81f3\u6f0f\u6781)\u7684\u529f\u7387\u635f\u8017\uff1b\u53cd\u5411\u6062\u590d\u7535\u8377(Qrr<\/span>)\u4e0d\u4ec5\u5f71\u54cd\u5f00\u5173\u5728\u53cd\u5411\u6062\u590d\u8fc7\u7a0b\u7684\u635f\u8017\uff0c\u8fd8\u5f71\u54cd\u5f00\u5173\u6027\u80fd\u3002<\/p>\n

\n\t\t\t\t\t\t\tMOSFET\u7684\u5c16\u5cf0\u7535\u538b\u968f\u7740Qrr<\/span>\u5347\u9ad8\u800c\u5347\u9ad8\uff0c\u56e0\u6b64\uff0cVFD<\/span>\u548cQrr<\/span>\u8f83\u4f4e\u7684\u4e8c\u6781\u7ba1\uff0c\u4f8b\u5982\u8096\u7279\u57fa\u4e8c\u6781\u7ba1\uff0c\u6709\u52a9\u4e8e\u63d0\u9ad8\u5f00\u5173\u7684\u603b\u4f53\u6027\u80fd\uff0c\u5728\u7535\u6865\u62d3\u6251\u6216\u7528\u4f5c\u540c\u6b65\u6574\u6d41\u5668\u5e94\u7528\u4e2d\uff0c\u5f53\u5f00\u5173\u9891\u7387\u5f88\u9ad8\u4e14\u4e8c\u6781\u7ba1\u957f\u65f6\u95f4\u5bfc\u901a\u65f6\uff0c\u63d0\u5347\u6027\u80fd\u7684\u6548\u679c\u7279\u522b\u660e\u663e\u3002\u672c\u6587\u5c06\u5728\u5f00\u5173\u7535\u6e90\u548c\u7535\u673a\u63a7\u5236\u73af\u5883\u4e2d\u8bc4\u4f30\u5185\u7f6e\u8096\u7279\u57fa\u4e8c\u6781\u7ba1\u7684\u65b060V MOSFET\u7684\u6027\u80fd\uff0c\u5e76\u5bf9\u6bd4\u6807\u51c6\u5668\u4ef6\uff0c\u91cd\u70b9\u8bba\u8ff0\u65b060V MOSFET\u7684\u4f18\u52bf\u3002<\/p>\n

\n\t\t\t\t\t\t\tMOSFET\u672c\u5f81\u4f53\u6f0f\u4e8c\u6781\u7ba1\u548c\u8096\u7279\u57fa\u4e8c\u6781\u7ba1\u7279\u6027<\/h1>\n

\n\t\t\t\t\t\t\t\u56fe1\u6240\u793a\u662f\u4e00\u4e2aN\u6c9f\u9053\u529f\u7387MOSFET\u7684\u5178\u578b\u7b26\u53f7\u3002\u672c\u5f81\u4f53\u6f0f\u4e8c\u6781\u7ba1\u7531p-body\u548cn-drift\u4e24\u4e2a\u533a\u7ec4\u6210\uff0c\u5982\u56fe1\u6240\u793a\uff0c\u4f53\u6f0f\u4e8c\u6781\u7ba1\u4e0eMOSFET\u7684\u5bfc\u7535\u6c9f\u9053\u5e76\u8054\u3002<\/p>\n

\n\t\t\t\t\t\t\t\"20171127-mosfet-1\"<\/p>\n

\n\t\t\t\t\t\t\t\u56fe1 \u529f\u7387MOSFET\u7ba1\u7684\u7b26\u53f7\u3002<\/p>\n

\n\t\t\t\t\t\t\t\u4e00\u65e6\u9009\u62e9\u4e86\u529f\u7387MOSFET\uff0c\u56e0\u4e3a\u7845\u7279\u6027\u548c\u4ea7\u54c1\u8bbe\u8ba1\u7684\u539f\u56e0\uff0c\u5176\u5185\u90e8\u96c6\u6210\u7684\u672c\u4f53\u4e8c\u6781\u7ba1\u7684\u7279\u6027\u4e5f\u5c31\u56fa\u5b9a\u4e0b\u6765\u3002\u672c\u5f81\u4f53\u6f0f\u4e8c\u6781\u7ba1\u4e0e\u5668\u4ef6\u4fe1\u9053\u5e76\u8054\uff0c\u6240\u4ee5\uff0c\u5206\u6790\u8be5\u672c\u5f81\u4f53\u6f0f\u4e8c\u6781\u7ba1\u7684\u52a8\u9759\u6001\u7279\u6027\uff0c\u7279\u522b\u662f\u5728\u4e8c\u6781\u7ba1\u5bfc\u901a\u6761\u4ef6\u4e0b\uff0c\u5177\u6709\u91cd\u8981\u610f\u4e49\u3002\u56e0\u6b64\uff0c\u5728\u53cd\u5411\u548c\u6b63\u5411\u504f\u538b\u8fc7\u7a0b\u4e2d\uff0c\u9700\u8981\u8003\u8651\u963b\u65ad\u7535\u538b\u548c\u6b63\u5411\u7535\u6d41\u7684\u6700\u5927\u503c\uff0c\u540c\u65f6\uff0c\u7814\u7a76\u5728\u529f\u7387\u5f00\u5173\u5bfc\u901a\u540e\u5173\u65ad\u671f\u95f4\u7684\u4e8c\u6781\u7ba1\u53cd\u5411\u6062\u590d\u8fc7\u7a0b\u4e5f\u5f88\u91cd\u8981(\u56fe2)\u3002<\/p>\n

\n\t\t\t\t\t\t\t\"20171127-mosfet-2\"<\/p>\n

\n\t\t\t\t\t\t\t\u56fe2 \u4e8c\u6781\u7ba1\u53cd\u5411\u6062\u590d\u8fc7\u7a0b\u3002<\/p>\n

\n\t\t\t\t\t\t\t\u5f53\u4e8c\u6781\u7ba1\u6b63\u5411\u504f\u538b\u53d8\u6210\u53cd\u5411\u504f\u538b\u65f6\uff0c\u7535\u6d41\u4e0d\u4f1a\u7acb\u5373\u964d\u81f3\u96f6\u503c\uff0c\u56e0\u4e3a\u6d88\u9664\u901a\u6001\u671f\u95f4\u50a8\u5b58\u7684\u7535\u8377\u9700\u8981\u65f6\u95f4\u3002\u56e0\u6b64\uff0c\u5f53t=t0<\/span>\u65f6\uff0c\u4e8c\u6781\u7ba1\u5f00\u59cb\u6362\u5411\u64cd\u4f5c\uff0c\u7535\u6d41\u5f00\u59cb\u4e0b\u964d\uff0c\u4e0b\u964d\u659c\u7387(-a)\u6052\u5b9a\uff0c\u5916\u90e8\u7535\u611f\u548c\u7535\u6e90\u7535\u538b\u662f\u51b3\u5b9a\u659c\u7387\u7684\u552f\u4e00\u56e0\u7d20\u3002\u5728t1<\/span>\u4e4b\u524d\uff0c\u4e8c\u6781\u7ba1\u88ab\u65bd\u52a0\u6b63\u5411\u504f\u538b\uff0c\u4ecet1<\/span>\u5230t2<\/span>\uff0c\u4e8c\u6781\u7ba1\u538b\u964d\u4e0a\u5347\uff0c\u8fbe\u5230\u7535\u6e90\u7535\u538b\uff1b\u5728t=t2<\/span>\u65f6\uff0c\u53cd\u5411\u7535\u6d41\u8fbe\u5230\u6700\u5927\u503c\u3002\u95f4\u9694(t3<\/span>-t0<\/span>)\u88ab\u79f0\u4e3a\u53cd\u5411\u6062\u590d\u65f6\u95f4(trr<\/span>)\uff0c\u800c\u8d1f\u7535\u6d41\u4e0e\u96f6\u7ebf\u4e4b\u95f4\u7684\u533a\u57df\u662f\u53cd\u5411\u6062\u590d\u7535\u8377(Qrr<\/span>)\u3002tB<\/span>\u671f\u95f4\u7684\u7535\u6d41\u659c\u7387\u4e3b\u8981\u4e0e\u4ea7\u54c1\u8bbe\u8ba1\u548c\u7845\u7279\u6027\u6709\u5173\u3002<\/p>\n

\n\t\t\t\t\t\t\t\u8f6f\u5ea6\u56e0\u5b50\u662f\u8f6f\u5ea6\u4e0e\u5feb\u901f\u6062\u590d\u5206\u7c7b\u6807\u51c6\uff0c\u8fd9\u4e2a\u53c2\u6570\u5728\u5f88\u591a\u5e94\u7528\u9886\u57df\u90fd\u5341\u5206\u91cd\u8981\u3002\u8f6f\u5ea6\u56e0\u5b50\u8d8a\u5927\uff0c\u53cd\u5411\u6062\u590d\u8f6f\u5ea6\u8d8a\u9ad8\u3002\u5b9e\u9645\u4e0a\uff0c\u5982\u679ctB<\/span>\u533a\u975e\u5e38\u77ed\uff0c\u7535\u6d41\u5feb\u901f\u53d8\u5316\u4e0e\u7535\u8def\u672c\u5f81\u7535\u611f\u5c31\u4f1a\u4ea7\u751f\u4e0d\u60f3\u770b\u5230\u7684\u7535\u538b\u8fc7\u51b2\u548c\u632f\u94c3\u6548\u5e94\u3002\u5c16\u5cf0\u7535\u538b\u53ef\u80fd\u4f1a\u9ad8\u4e8e\u529f\u7387\u5f00\u5173\u7ba1\u7684\u51fb\u7a7f\u7535\u538b\uff0c\u6b64\u5916\uff0cEMI\u6027\u80fd\u4e5f\u4f1a\u6076\u5316\u3002\u5982\u56fe2\u6240\u793a\uff0c\u5728\u4e8c\u6781\u7ba1\u53cd\u5411\u6062\u590d\u671f\u95f4\uff0c\u5927\u7535\u6d41\u548c\u9ad8\u53cd\u5411\u7535\u538b\u4f1a\u540c\u65f6\u4ea7\u751f\u8017\u6563\u529f\u7387\uff0c\u81f4\u4f7f\u7cfb\u7edf\u6027\u80fd\u964d\u4f4e\u3002<\/p>\n

\n\t\t\t\t\t\t\t\u6b64\u5916\uff0c\u5728\u7535\u6865\u62d3\u6251\u4e2d\uff0c\u4e0b\u6865\u81c2\u5f00\u5173\u7684\u6700\u5927\u53cd\u5411\u6062\u590d\u7535\u6d41\u52a0\u5230\u4e0a\u6865\u81c2\u5f00\u5173\u7535\u6d41\u4e2d\uff0c\u81f4\u4f7f\u8017\u6563\u529f\u7387\u4e0a\u5347\u81f3\u6700\u5927\u989d\u5b9a\u503c\u3002\u5728\u672c\u4f53\u4e8c\u6781\u7ba1\u5145\u5f53\u7eed\u6d41\u5668\u4ef6\u7684\u7535\u6865\u62d3\u6251\u3001\u964d\u538b\u8f6c\u6362\u5668\u6216\u540c\u6b65\u6574\u6d41\u7b49\u5f00\u5173\u5e94\u7528\u4e2d\uff0c\u53cd\u5411\u6062\u590d\u7535\u8377(Qrr)\u51cf\u5c11\u6709\u52a9\u4e8e\u7cfb\u7edf\u6027\u80fd\u6700\u5927\u5316\uff0c\u6291\u5236\u5c16 \u5cf0\u7535\u538b\uff0c\u964d\u4f4e\u5173\u65ad\u65f6\u7684\u5f00\u5173\u566a\u58f0\u3002\u5728MOSFET\u7ed3\u6784\u5185\u96c6\u6210\u4e00\u4e2a\u8096\u7279\u57fa\u4e8c\u6781\u7ba1\u662f\u4e00\u4e2a\u6548\u679c\u4e0d\u9519\u7684\u89e3\u51b3\u65b9\u6848\u3002\u96c6\u6210\u8096\u7279\u57fa\u4e8c\u6781\u7ba1\u7684\u65b9\u6cd5\u662f\u5728\u91d1\u5c5e\u8584\u819c\u5c42\u4e0e\u534a\u5bfc\u4f53\u533a\u4e4b\u95f4\u5236\u4f5c\u4e00\u4e2a\u7535\u89e6\u70b9\uff0c\u7535\u6d41\u4e3b\u8981\u662f\u4e0e\u591a\u6570\u8f7d\u6d41\u5b50\u6709\u5173\uff0c\u56e0\u4e3a\u50a8\u5b58\u7535\u8377\u5c11\uff0c\u8096\u7279\u57fa\u4e8c\u6781\u7ba1\u6b63\u53cd\u504f\u538b\u5207\u6362\u6bd4\u5176\u4ed6\u7845\u4e8c\u6781\u7ba1\u5feb\u3002\u6b64\u5916\uff0c\u8096\u7279\u57fa\u6b63\u5411\u538b\u964d(≈0.3V)\u6bd4\u6807\u51c6\u7845\u4e8c\u6781\u7ba1\u4f4e\uff0c\u8fd9\u610f\u5473\u7740\u8096\u7279\u57fa\u7684\u901a\u6001\u529f\u7387\u635f\u8017\u5c0f\u3002<\/p>\n

\n\t\t\t\t\t\t\t\u5f53\u53ea\u6709\u4f18\u5316Qrr<\/span>\u548cVF,diode<\/span>\u624d\u80fd\u63d0\u9ad8\u7cfb\u7edf\u603b\u4f53\u6027\u80fd\u65f6\uff0c\u96c6\u6210\u8096\u7279\u57fa\u4e8c\u6781\u7ba1\u7684\u65b060V MOSFET\u662f\u4e00\u4e2a\u6b63\u786e\u9009\u62e9\u3002\u56fe3\u5217\u51fa\u4e86\u6807\u51c6MOSFET\u548c\u96c6\u6210\u8096\u7279\u57fa\u7684\u529f\u7387\u5f00\u5173\u7684\u4e3b\u8981\u7535\u53c2\u6570(\u4e24\u6b3e\u4ea7\u54c1\u7684BVDSS<\/span>\u548c\u82af\u7247\u5c3a\u5bf8\u76f8\u540c)\u3002<\/p>\n

\n\t\t\t\t\t\t\t\"20171127-mosfet-3\"<\/p>\n

\n\t\t\t\t\t\t\t\u56fe3 MOSFET\u7684\u7535\u53c2\u6570\u3002<\/p>\n

\n\t\t\t\t\t\t\t\u5355\u7247\u8096\u7279\u57fa\u4e8c\u6781\u7ba1\u5728\u7535\u6e90\u7ba1\u7406\u73af\u5883\u7684\u4ea7\u54c1\u4f18\u52bf<\/h1>\n

\n\t\t\t\t\t\t\t\u5728\u4e00\u4e2a\u540c\u6b65\u964d\u538b\u8f6c\u6362\u5668(\u56fe4)\u5185\uff0c\u96c6\u6210\u8096\u7279\u57fa\u4e8c\u6781\u7ba1\u7684\u529f\u7387MOSFET\u53ef\u4ee5\u7528\u4f5c\u4e0b\u6865\u81c2\u5f00\u5173(S2)\uff0c\u4ee5\u63d0\u9ad8\u8f6c\u6362\u5668\u7684\u603b\u4f53\u6027\u80fd\u3002<\/p>\n

\n\t\t\t\t\t\t\t\"20171127-mosfet-4\"<\/p>\n

\n\t\t\t\t\t\t\t\u56fe4 \u5355\u76f8\u540c\u6b65\u6574\u6d41\u964d\u538b\u8f6c\u6362\u5668\u62d3\u6251\u3002<\/p>\n

\n\t\t\t\t\t\t\t\u4e8b\u5b9e\u4e0a\uff0c\u4e0b\u6865\u81c2\u4f53\u4e8c\u6781\u7ba1\u5bfc\u901a\u635f\u8017(Pdiode,cond<\/span>)\u548c\u53cd\u5411\u6062\u590d\u635f\u8017(PQrr<\/span>)\u4e0e\u4e8c\u6781\u7ba1\u6b63\u5411\u538b\u964d(VF,diode<\/span>)\u53ca\u5176\u53cd\u5411\u6062\u590d\u7535\u8377(Qrr<\/span>)\u5bc6\u5207\u76f8\u5173\uff1a<\/p>\n

\n\t\t\t\t\t\t\t\"20171127-mosfet-f\"<\/p>\n

\n\t\t\t\t\t\t\t\u5982\u516c\u5f0f(1)\u548c(2)\u6240\u793a\uff0c\u5bfc\u901a\u635f\u8017\u968f\u7740\u5f00\u5173\u9891\u7387\u3001\u8f6c\u6362\u5668\u8f93\u5165\u7535\u538b\u548c\u8f93\u51fa\u7535\u6d41\u5347\u9ad8\u800c\u53d8\u5927\u3002\u5f53\u4e24\u4e2a\u573a\u6548\u5e94\u6676\u4f53\u7ba1\u90fd\u662f\u5173\u65ad\u72b6\u6001\uff0c\u7535\u6d41\u7ecf\u8fc7\u4e0b\u6865\u81c2\u672c\u4f53\u4e8c\u6781\u7ba1\u65f6\u88ab\u79f0\u4e3a\u6b7b\u533a\u65f6\u95f4(dead time)\uff0c\u4e25\u91cd\u5f71\u54cd\u4e8c\u6781\u7ba1\u5bfc\u901a\u635f\u8017\uff1a\u5f53\u7a7a\u8f7d\u65f6\u95f4\u8f83\u957f\u65f6\uff0c\u964d\u4f4e\u4f53\u4e8c\u6781\u7ba1\u6b63\u5411\u538b\u964d\u6709\u52a9\u4e8e\u5bfc\u901a\u635f\u8017\u6700\u5c0f\u5316\uff0c\u63d0\u9ad8\u6027\u80fd\u3002\u56fe5\u6240\u793a\u662f60W\u300148V~12V\u3001250kHz\u540c\u6b65\u6574\u6d41\u964d\u538b\u8f6c\u6362\u5668\u7684\u6027\u80fd\u3002<\/p>\n

\n\t\t\t\t\t\t\t\"20171127-mosfet-5\"<\/p>\n

\n\t\t\t\t\t\t\t\u56fe5 \u540c\u6b65\u6574\u6d41\u964d\u538b\u8f6c\u6362\u5668\u7684\u6027\u80fd\u3002<\/p>\n

\n\t\t\t\t\t\t\t\u73b0\u5728\uff0c\u89c2\u5bdf\u9694\u79bb\u529f\u7387\u8f6c\u6362\u5668\u73af\u5883\uff0c\u5f53\u8f93\u51fa\u529f\u7387\u548c\u7a7a\u8f7d\u65f6\u95f4\u6570\u503c\u90fd\u5f88\u5927\u65f6\uff0c\u7406\u60f3\u7684\u4e8c\u6b21\u4fa7\u540c\u6b65\u6574\u6d41\u5668\u4e0d\u4ec5\u5177\u6709\u5c3d\u53ef\u80fd\u5c0f\u7684RDSon<\/span>\u5bfc\u901a\u7535\u963b\uff0c\u4ee5\u964d\u4f4e\u5bfc\u901a\u635f\u8017\uff0c\u540c\u65f6\u8fd8\u5e94\u4f18\u5316\u672c\u4f53\u4e8c\u6781\u7ba1\u7279\u6027(Qrr<\/span>\u548cVF,diode<\/span>)\uff0c\u4ee5\u964d\u4f4e\u4e8c\u6781\u7ba1\u635f\u8017(\u56fe1\u548c2)\uff0c\u4ee5\u6700\u5927\u9650\u5ea6\u964d\u4f4e\u5173\u65ad\u5c16\u5cf0\u7535\u538b\u3002\u672c\u6587\u5728\u4e00\u4e2a500W\u6570\u5b57\u7535\u6e90\u5185\u5bf960V\u6807\u51c6\u529f\u7387\u5f00\u5173\u548c\u5185\u7f6e\u8096\u7279\u57fa\u7684\u529f\u7387\u5f00\u5173\u8fdb\u884c\u6bd4\u8f83\u3002\u6570\u5b57\u7535\u6e90\u7531\u4e24\u4e2a\u529f\u7387\u7ea7\u7ec4\u6210\uff1a\u529f\u7387\u56e0\u5b50\u6821\u6b63\u5668\u548c\u5185\u7f6e\u540c\u6b65\u6574\u6d41\u5668\u7684LLC\u8c10\u632f\u7535\u8def\uff0c\u6700\u5927\u8f93\u51fa\u7535\u6d41\u662f42A\u3001\u6ee1\u8d1f\u8f7d\u5f00\u5173\u9891\u7387\u662f80kHz\u3001\u7a7a\u8f7d\u65f6\u95f41μs\u3002\u56fe6\u662f\u6027\u80fd\u66f2\u7ebf\u6bd4\u8f83\u3002<\/p>\n

\n\t\t\t\t\t\t\t\"20171127-mosfet-6\"<\/p>\n

\n\t\t\t\t\t\t\t\u56fe6 \u540c\u6b65\u6574\u6d41\u964d\u538b\u8f6c\u6362\u5668\u7684\u6027\u80fd\u3002<\/p>\n

\n\t\t\t\t\t\t\t\u5728\u4e24\u4e2a\u62d3\u6251\u5185\uff0c60V\u5185\u7f6e\u8096\u7279\u57fa\u4e8c\u6781\u7ba1\u7684\u5668\u4ef6\u5728\u6574\u4e2a\u7535\u6d41\u8303\u56f4\u5185\u6027\u80fd\u8868\u73b0\u66f4\u597d\uff0c\u4ece\u800c\u63d0\u9ad8\u4e86\u7cfb\u7edf\u603b\u4f53\u6027\u80fd\u3002<\/p>\n

\n\t\t\t\t\t\t\t\u5728\u7535\u6865\u62d3\u6251\u4e2d\u6539\u5584\u5f00\u5173\u7279\u6027<\/h1>\n

\n\t\t\t\t\t\t\t\u5728\u7535\u6865\u62d3\u6251\u5185\uff0c\u53cd\u5411\u6062\u590d\u8fc7\u7a0b\u4ece\u4e0b\u6865\u81c2\u5f00\u5173(\u56fe7\u4e2d\u7684Q2)\u7eed\u6d41\u7ed3\u675f\u65f6\u5f00\u59cb\uff0c\u5230\u4e0a\u6865\u81c2\u5f00\u5173(\u56fe7\u4e2d\u7684Q1)\u5f00\u59cb\u5bfc\u901a\u65f6\u7ec8\u6b62\uff0c\u4e14\u6700\u7ec8\u7684\u6062\u590d\u7535\u6d41\u52a0\u5230\u4e0a\u6865\u81c2\u7535\u6d41\u5185\u3002\u8fde\u540c\u4e0a\u6865\u81c2\u5f00\u5173\u4e0a\u7684\u989d\u5916\u7535\u6d41\uff0c\u4e0b\u6865\u81c2\u53cd\u5411\u6062\u590d\u8fc7\u7a0b\u4e0eVds<\/span>≈0V\u5230Vdc<\/span>\u6362\u5411\u64cd\u4f5c\uff0c\u53ef\u80fd\u4f1a\u5728\u4e0b\u6865\u81c2\u5f00\u5173\u95f8\u6e90\u7535\u538b\u4e0a\u4ea7\u751f\u6742\u6563\u8df3\u53d8\u7535\u538b\uff0c\u56e0\u4e3a\u4e0b\u6865\u81c2Ciss<\/span>(\u8f93\u5165\u7535\u5bb9)\u662f\u900f\u8fc7Crss<\/span>(Miller\u7535\u5bb9)\u5b8c\u6210\u5145\u7535\u8fc7\u7a0b\u3002<\/p>\n

\n\t\t\t\t\t\t\t\"20171127-mosfet-7\"<\/p>\n

\n\t\t\t\t\t\t\t\u56fe7 \u5168\u6865\u8f6c\u6362\u5668\u539f\u7406\u56fe\u3002<\/p>\n

\n\t\t\t\t\t\t\t\u7ed3\u679c\uff0c\u5728Q2\u6805\u6781\u4e0a\u611f\u5e94\u7684\u7535\u538b\u53ef\u80fd\u4f1a\u89e6\u53d1\u5f00\u5173\uff0c\u81f4\u4f7f\u7cfb\u7edf\u7a33\u5065\u6027\u548c\u6027\u80fd\u6076\u5316\u3002\u7535\u6865\u4e0b\u6865\u81c2\u5f00\u5173\u5e94\u8be5\u6709\u8f6f\u6362\u5411\u529f\u80fd\uff0c\u5728\u6f0f\u6e90\u6781\u4e4b\u95f4\u65e0\u5371\u9669\u7684\u5c16\u5cf0\u7535\u538b\u548c\u9ad8\u9891\u632f\u94c3\u6548\u5e94\uff0c\u4e0b\u6865\u81c2\u5f00\u5173\u6539\u7528\u5185\u7f6e\u8096\u7279\u57fa\u7684\u529f\u7387MOSFET\uff0c\u5373\u53ef\u53d6\u5f97\u6240\u9700\u7684\u5f00\u5173\u7279\u6027\u3002\u4e8b\u5b9e\u4e0a\uff0c\u5176\u8f83\u5c0f\u7684\u53cd\u5411\u6062\u590d\u7535\u8377(Qrr<\/span>)\u76f4\u63a5\u5f71\u54cd\u7535\u538b\u8fc7\u51b2\u503c\uff0c\u56e0\u4e3aQrr\u503c\u8d8a\u9ad8\uff0c\u8fc7\u51b2\u7535\u538b\u8d8a\u9ad8\u3002\u5982\u679cVds<\/span>\u8fc7\u51b2\u548c\u632f\u94c3\u6548\u5e94\u53c2\u6570\u503c\u8f83\u4f4e\uff0c\u4e0b\u6865\u81c2\u5f00\u5173\u6805\u6781\u6742\u6563\u8df3\u53d8\u7535\u538b\u5c06\u4f1a\u964d\u4f4e\uff0c\u4ece\u800c\u5c06\u51fb\u7a7f\u98ce\u9669\u964d\u5230\u6700\u4f4e\u3002\u6b64\u5916\uff0c\u56e0\u4e3a\u5f00\u5173\u566a\u58f0\u964d\u4f4e\uff0c\u8f6f\u6062\u590d\u8fd8\u80fd\u63d0\u9ad8EMI\u603b\u4f53\u6027\u80fd\u3002\u4ece\u6807\u51c6MOSFET\u548c\u5185\u7f6e\u8096\u7279\u57faMOSFET\u4e0a\u6865\u81c2\u5bfc\u901a\u6ce2\u5f62\u6765\u770b\uff0c\u4e0d\u96be\u53d1\u73b0\uff0c\u96c6\u6210\u8096\u7279\u57fa\u4e8c\u6781\u7ba1MOSFET\u4e0b\u6865\u81c2\u6742\u6563\u8df3\u53d8\u7535\u538b\u4e0b\u964d\u660e\u663e\u3002<\/p>\n

\n\t\t\t\t\t\t\t\u7ed3\u8bba<\/h1>\n

\n\t\t\t\t\t\t\t\u4e3a\u5f88\u591a\u5e94\u7528(\u5de5\u4e1a\u7535\u673a\u548c\u5f00\u5173\u7535\u6e90\u7684\u540c\u6b65\u6574\u6d41\u3001\u9006\u53d8\u5668\u3001\u7535\u673a\u9a71\u52a8)\u9009\u62e9\u9002\u5408\u7684MOSFET\u65f6\uff0c\u4e0d\u4ec5\u8981\u8003\u8651RDSon<\/span>\u548cQg<\/span>\uff0c\u8fd8\u8981\u5206\u6790\u672c\u5f81\u4f53\u6f0f\u4e8c\u6781\u7ba1\u7684\u52a8\u9759\u6001\u7279\u6027\u3002\u5f53\u9700\u8981\u8f6f\u53cd\u5411\u6062\u590d\u548c\u4f4eQrr<\/span>\u65f6\uff0c\u96c6\u6210\u8096\u7279\u57fa\u4e8c\u6781\u7ba1\u768460V F7\u529f\u7387MOSFET\u786e\u4fdd\u529f\u7387\u5f00\u5173\u7684\u6027\u80fd\u548c\u6362\u5411\u6027\u80fd\u66f4\u52a0\u51fa\u8272\u3002\u6b64\u5916\uff0c\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u5f53\u7eed\u6d41\u65f6\u95f4\u6216\u7a7a\u8f7d\u65f6\u95f4\u6301\u7eed\u65f6\u95f4\u957f\u65f6\uff0c\u8096\u7279\u57fa\u7684VF,diode<\/span>\u6570\u503c\u53ef\u8ba9\u5e94\u7528\u53d6\u5f97\u66f4\u9ad8\u6027\u80fd\u3002<\/p>\n

\n\t\t\t\t\t\t\t\uff08\u6587\u7ae0\u8f6c\u8f7d\u81eaEDN\u53f0\u6e7e\u7248\uff09<\/em><\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n

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