{"id":959,"date":"2018-09-16T12:00:28","date_gmt":"2018-09-16T12:00:28","guid":{"rendered":""},"modified":"2018-09-16T20:03:42","modified_gmt":"2018-09-16T12:03:42","slug":"%e5%bc%80%e5%85%b3%e7%94%b5%e6%ba%90%e6%8d%9f%e8%80%97%e7%9f%a5%e8%af%86%e7%82%b9%e4%b9%8b%e5%bc%80%e5%85%b3%e7%94%b5%e6%ba%90%e4%ba%a7%e5%93%81%e5%90%84%e4%b8%aa%e9%83%a8%e5%88%86%e7%9a%84","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=959","title":{"rendered":"\u5f00\u5173\u7535\u6e90\u635f\u8017\u77e5\u8bc6\u70b9\u4e4b\u5f00\u5173\u7535\u6e90\u4ea7\u54c1\u5404\u4e2a\u90e8\u5206\u7684"},"content":{"rendered":"
\n\t\u5b66\u7535\u6e90\u7535\u6e90\u770b\u8fd9\u91cc\uff0c\u8fd9\u6b21\u6211\u4eec\u5206\u4eab\u4e00\u4e0b\u5f00\u5173\u7535\u6e90<\/u>“\u529f\u7387\u635f\u8017”\u53ca“\u70ed\u8017”\u7684\u5de5\u7a0b\u4f30\u7b97\uff01<\/p>\n
\n\t\u7535\u6e90\u5728\u4e3a\u8d1f\u8f7d\u63d0\u4f9b\u80fd\u91cf\u7684\u540c\u65f6\u4e5f\u5728\u71c3\u70e7\u81ea\u5df1\uff0c\u5728\u7535\u6e90\u8bbe\u8ba1\u65f6\u5927\u5bb6\u4f1a\u5f88\u4ed4\u7ec6\u7684\u53bb\u5206\u6790\u8d1f\u8f7d\u7684\u9700\u6c42\uff0c\u4f46\u662f\u5bb9\u6613\u5ffd\u7565\u7535\u6e90\u82af\u7247\u6216\u8005\u5176\u5916\u56f4\u5668\u4ef6\u7684\u70ed\u8017\uff0c\u5bf9\u7535\u6e90\u70ed\u8017\u7684\u8bc4\u4f30\u7684\u76ee\u7684\u662f\u4e3a\u4e86\u4fdd\u8bc1\u7535\u6e90\u59cb\u7ec8\u5de5\u4f5c\u5728\u4e00\u4e2a\u5b89\u5168\u7684\u72b6\u6001\uff08\u4e0d\u4f1a\u88ab\u70ed\u4fdd\u62a4\u6216\u8005\u70e7\u6bc1\uff09\u3002\u8bc4\u4f30\u70ed\u8017\u7684\u7b2c\u4e00\u6b65\u5de5\u4f5c\u662f\u8ba1\u7b97\u7535\u6e90\u65b9\u6848\u7684\u8017\u6563\u529f\u7387\uff08\u88ab\u635f\u8017\u6389\u7684\u529f\u7387\uff09\uff0c\u8bc4\u4f30\u8017\u6563\u529f\u7387\u6709\u4e24\u79cd\u65b9\u6cd5\uff0c\u9ed1\u76d2\u548c\u767d\u76d2\u3002<\/p>\n
\n\t\u4e00\u3001\u9ed1\u76d2\u65b9\u5f0f\u8bc4\u4f30\u7535\u6e90\u7684\u8017\u6563\u529f\u7387<\/p>\n
\n\t\u7535\u6e90\u82af\u7247\u53ca\u5916\u56f4\u7684\u5668\u4ef6\u7684\u70ed\u8017\u5360\u7535\u6e90\u7684\u8f93\u5165\u603b\u529f\u7387\u7684\u6bd4\u4f8b\u5c31\u662f\u7535\u6e90\u7684\u6548\u7387\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u4ece\u7535\u6e90\u7684\u6548\u7387\u53cd\u63a8\u5f97\u5230\u7535\u6e90\u7684\u8017\u6563\u529f\u7387\uff0c\u5982\u56fe1.1\u3002<\/p>\n
\n\t<\/p>\n
\n\t\u56fe 1.1 \u7535\u6e90\u7684\u529f\u7387\u4f20\u8f93<\/p>\n
\n\t\u7531\u56fe1.1\u63a8\u5bfc\u5f97\u77e5\u8017\u6563\u529f\u7387\u7684\u8ba1\u7b97\u516c\u5f0f\u5982\u4e0b\uff1a<\/p>\n
\n\t<\/p>\n
\n\t\u5f0f1.1\u662f\u4ece\u6548\u7387\u548c\u8f93\u51fa\u529f\u7387Po\u53cd\u63a8\u5f97\u5230\u8017\u6563\u529f\u7387\u7684\u3002\u4e3a\u4ec0\u4e48\u8981\u9009\u62e9\u8f93\u51fa\u529f\u7387\u800c\u4e0d\u662f\u8f93\u5165\u529f\u7387\u5462\uff1f\u56e0\u4e3a\u8f93\u51fa\u529f\u7387\u7684\u6570\u636e\u6bd4\u8f83\u5bb9\u6613\u53d6\u5f97\uff0c\u5c31\u662f\u8d1f\u8f7d\u7684\u5b9e\u9645\u9700\u6c42\uff0c\u76f8\u6bd4\u4e4b\u4e0b\u8f93\u5165\u7535\u538b\u7684\u8303\u56f4\u6bd4\u8f83\u5bbd\u6cdb\uff0c\u6240\u4ee5\u8f93\u5165\u529f\u7387\u6bd4\u8f83\u96be\u5b9a\u91cf\u5f97\u5230\u3002<\/p>\n
\n\t\u90a3\u4e48\u7535\u6e90\u6548\u7387\u7684\u6570\u636e\u5982\u4f55\u53bb\u83b7\u53d6\u5462\uff1f\u5f88\u7b80\u5355\uff0c\u5982\u679c\u662f\u7ebf\u6027\u7a33\u538b\u5668<\/u>\uff0c\u90a3\u4e48\u6548\u7387\u5c31\u662f\u8f93\u51fa\u7535\u538b\u4e0e\u8f93\u5165\u7535\u538b\u7684\u6bd4\u503c(V0\/Vin)\uff0c\u56e0\u4e3a\u8f93\u51fa\u7535\u6d41\u7ea6\u7b49\u4e8e\u8f93\u5165\u7535\u6d41\uff1b\u5982\u679c\u662f\u5f00\u5173\u7535\u6e90\uff0c\u7535\u6e90\u6548\u7387\u53ef\u4ee5\u4f30\u4e3a85%\uff0c\u5982\u9700\u8981\u66f4\u4e3a\u7cbe\u786e\u53ef\u4ee5\u67e5\u82af\u7247\u89c4\u683c\u4e66\u7684\u56fe\u8868\uff0c\u5982\u56fe1.2\u793a\u4f8b\u3002<\/p>\n
\n\t<\/p>\n
\n\t\u56fe 1.2 \u67d0\u7535\u6e90\u82af\u7247\u7684\u6548\u7387\u56fe\u8868\u793a\u610f<\/p>\n
\n\t\u4e8c\u3001\u767d\u76d2\u65b9\u5f0f\u8ba1\u7b97\u7535\u6e90\u7684\u8017\u6563\u529f\u7387<\/p>\n
\n\t\u7ebf\u6027\u7a33\u538b\u5668\u7684\u539f\u7406\u5355\u7eaf\u4e14\u591a\u4e3a\u96c6\u6210\u6a21\u5757\uff0c\u6240\u4ee5\u4e86\u89e3\u5982\u4f55\u4f7f\u7528\u9ed1\u76d2\u65b9\u5f0f\u8ba1\u7b97\u8017\u6563\u529f\u7387\u4e00\u822c\u5df2\u7ecf\u8db3\u591f\u3002\u76f8\u6bd4\u4e4b\u4e0b\u5f00\u5173\u7535\u6e90\u7684\u96c6\u6210\u5ea6\u8f83\u5f31\uff0c\u6240\u4ee5\u6709\u65f6\u5019\u9700\u8981\u5206\u89e3\u5b50\u6a21\u5757\u4e14\u5355\u72ec\u8ba1\u7b97\u5176\u8017\u6563\u529f\u7387\uff0c\u8fd9\u5c31\u662f\u6240\u8c13\u7684\u767d\u76d2\u6a21\u5f0f\u3002\u672c\u6587\u5747\u4ee5Buck\u4e3a\u4f8b\uff0c\u5176\u5b83\u62d3\u8865\u5f62\u5f0f\u53ef\u81ea\u884c\u7c7b\u63a8\u3002<\/p>\n
\n\t\u5728BUCK\u7535\u8def\u7684\u6280\u672f\u6f14\u53d8\u8fc7\u7a0b\u4e2d\u51fa\u73b0\u4e86\u4e24\u4e2a\u5c0f\u5206\u652f\uff0c\u540c\u6b65Buck\u4e0e\u975e\u540c\u6b65Buck\u3002\u4e24\u8005\u7684\u5916\u89c2\u5dee\u5f02\u660e\u663e\u5f88\u597d\u533a\u5206\uff0c\u6709\u4e0a\u4e0b\u4e24\u4e2aMOSFET<\/u>\u7ba1\u7684Buck\u53eb\u540c\u6b65Buck\uff1b\u53ea\u6709\u4e0a\u7ba1MOSFET\uff0c\u7eed\u6d41\u7ba1\u662f\u8096\u7279\u57fa\u4e8c\u6781\u7ba1<\/u>\u7684Buck\u53eb\u505a\u975e\u540c\u6b65Buck\u3002\u540c\u6b65Buck\u662f\u540e\u9762\u53d1\u5c55\u51fa\u6765\u7684\u6280\u672f\uff0c\u4f7f\u7528MOSFET\u6765\u4ee3\u66ff\u7eed\u6d41\u4e8c\u6781\u7ba1\u964d\u4f4e\u4e86\u5bfc\u901a\u538b\u964d\uff0c\u6240\u4ee5\u63d0\u5347\u4e86\u7535\u6e90\u6548\u7387\uff0c\u5f53\u7136\u9700\u8981\u989d\u5916\u589e\u52a0\u4e00\u5957MOSFET\u9a71\u52a8\u7535\u8def\u6210\u672c\u6709\u6240\u4e0a\u5347\u3002<\/p>\n
\n\t<\/p>\n
\n\t\u56fe1.3 \u540c\u6b65\u4e0e\u975e\u540c\u6b65Buck<\/p>\n
\n\t\u5f00\u5173\u7535\u6e90\u7684\u635f\u8017\u4e3b\u8981\u7531\u4e24\u5927\u5757\u7ec4\u6210\uff0c\u8def\u5f84\u635f\u8017\u4e0e\u5f00\u5173\u635f\u8017\u3002<\/p>\n
\n\t1\u3001\u8def\u5f84\u635f\u8017\uff08\u4f20\u5bfc\u635f\u8017\uff09\uff1a\u5927\u7535\u6d41\u8def\u5f84\u4e0a\u7684\u5185\u963b\u4e0a\u7684\u635f\u8017\u3002\u4ee5BUCK\u4e3a\u4f8b\uff0c\u8def\u5f84\u635f\u8017\u5305\u62ec\u4e0a\u81c2MOSFET\u7684\u5185\u963b\u635f\u8017\uff0c\u7535\u611f\u7684\u5bc4\u751f\u963b\u6297(DCR)\u4e0a\u7684\u635f\u8017\u53ca\u4e0b\u81c2MOSFET\u6216\u8005\u7eed\u6d41\u4e8c\u6781\u7ba1\u4e0a\u7684\u635f\u8017\u3002<\/p>\n
\n\t2\u3001\u5f00\u5173\u635f\u8017\uff1a\u5f00\u901a\u548c\u5173\u95edMOSFET\u8fc7\u7a0b\u4e2d\u7684\u635f\u8017\uff0c\u4e0e\u5f00\u5173\u9891\u7387\u6210\u6b63\u6bd4\u3002<\/p>\n
\n\t\uff08\u4e00\uff09\u3001\u7406\u89e3\u5f00\u5173\u635f\u8017<\/p>\n
\n\t\u8def\u5f84\u635f\u8017\u6bd4\u8f83\u597d\u7406\u89e3\uff0c\u5f88\u76f4\u89c2\uff0c\u6211\u4eec\u6765\u7740\u91cd\u4ecb\u7ecd\u4e00\u4e0b\u5f00\u5173\u635f\u8017\u7684\u4ea7\u751f\u539f\u56e0\u3002\u5982\u56fe1.4\u6240\u793a\uff0c\u4e0a\u6865\u81c2MOSFET\u7684\u6f0f\u6781\u8fde\u63a5\u81f3Vin\uff0c\u800c\u6e90\u6781\u8fde\u63a5\u81f3\u76f8\u4f4d\u8282\u70b9\u3002\u5f53\u4e0a\u6865\u81c2\u5f00\u59cb\u5f00\u542f\u65f6\uff0c\u4e0b\u6865\u81c2MOSFET\u7684\u4f53\u4e8c\u6781\u7ba1\uff08\u975e\u540c\u6b65BUCK\u540c\u7406\uff09\u4f1a\u5c06\u76f8\u4f4d\u70b9\u7b9d\u4f4d\u4e3a\u4f4e\u4e8e\u5730\u7535\u538b\uff08\u8d1f\u538b\uff09\u3002\u8fd9\u79cd\u5f88\u5927\u7684\u6f0f-\u6e90\u7535\u538b\u5dee\u53ca\u4e14\u4e0a\u6865\u81c2MOSFET\u4e5f\u4ee5\u5f00\u5173\u65b9\u5f0f\u4f20\u8f93\u8f6c\u6362\u5668\u7684\u5b8c\u5168\u8d1f\u8f7d\u7535\u6d41\uff0c\u6240\u4ee5\u5728\u5f00\u5173\u8fc7\u7a0b\u4e2d\u4ea7\u751f\u4e86\u5f00\u5173\u635f\u8017\u3002<\/p>\n
\n\t<\/p>\n
\n\t\u56fe1.4 Buck\u7684\u5f00\u5173\u635f\u8017\u793a\u610f<\/p>\n
\n\t<\/p>\n
\n\t\u56fe1.5 MOSFET\u7684\u5bc4\u751f\u7535\u5bb9<\/p>\n
\n\t\u56fe1.5\u662fMOSFET\u7684\u5bc4\u751f\u7535\u5bb9\u793a\u610f\uff0c\u56fe1.6\u662f\u4e0a\u6865\u81c2MOSFET\u7684\u5f00\u5173\u635f\u8017\u56fe\u5f62\uff0c\u8fd9\u662f\u7406\u60f3\u56fe\u5f62\u5e76\u5047\u8bbe\u6805\u6781\u7535\u6d41\u662f\u6052\u5b9a\u7684\u3002\u5f00\u5173\u635f\u8017\u7684\u4ea7\u751f\u673a\u7406\u4e0eMOSFET\u7684\u5bc4\u751f\u7535\u5bb9\u76f8\u5173\u3002<\/p>\n
\n\t<\/p>\n
\n\t\u56fe1.6 \u4e0a\u6865\u81c2MOSFET\u7684\u7406\u60f3\u5f00\u5173\u635f\u8017\u56fe\u5f62<\/p>\n
\n\t\u5f00\u5173\u635f\u8017\u4ea7\u751f\u8fc7\u7a0b\u8be6\u7ec6\u5206\u6790\uff1a<\/p>\n
\n\t1\u3001\u5728\u65f6\u95f4\u6bb5t1\u5f00\u59cb\u65f6\uff0c\u5f53MOSFET\u9a71\u52a8\u5668\u5f00\u59cb\u5411MOSFET\u7684\u6805\u6781\u63d0\u4f9b\u7535\u6d41\u65f6\uff0cVGS\uff08MOSFET \u7684\u6805 - \u6e90\u7535\u538b\uff09\u5f00\u59cb\u4e0a\u5347\u3002\u5728\u6b64\u671f\u95f4\uff0c\u5c06\u5bf9\u8f93\u5165\u7535\u5bb9 Ciss\uff08CGS + CGD\uff09\u8fdb\u884c\u5145\u7535\uff0c\u800c VDS\uff08MOSFET \u7684\u6f0f - \u6e90\u7535\u538b\uff09\u4fdd\u6301\u6052\u5b9a\u3002\u6b64\u65f6\u4e0d\u5b58\u5728\u6f0f - \u6e90\u7535\u6d41\uff0c\u56e0\u6b64\uff0c\u5728\u6b64\u671f\u95f4\u6ca1\u6709\u5f00\u5173\u635f\u8017\u3002==>VGS\u5c0f\u4e8e\u9608\u503c\uff0cMOSFET\u672a\u5f00\u542f\uff0c\u65e0\u635f\u8017\u3002<\/p>\n
\n\t2\u3001\u5728\u65f6\u95f4\u6bb5 t2 \u5f00\u59cb\u65f6\uff0c VGS \u7535\u538b\u8d85\u51fa\u6805 - \u6e90\u9608\u503c\u7535\u538b<\/u>\uff08VGS(TH)\uff09\u3002\u7535\u6d41\u5f00\u59cb\u4ece\u6f0f\u6781\u6d41\u5411\u6e90\u6781\uff0c\u540c\u65f6 Ciss\u7ee7\u7eed\u5145\u7535\u3002\u8be5\u7535\u6d41\u5c06\u7ebf\u6027\u4e0a\u5347\uff0c\u76f4\u5230 Ids \u7b49\u4e8e\u7535\u611f\u7535\u6d41 IL \u4e3a\u6b62\u3002\u7531\u4e8e MOSFET \u4e0a\u5b58\u5728\u7b49\u4e8e VIN \u7684\u7535\u538b\u964d\uff0c\u5e76\u4e14\u7535\u6d41Ids \u6d41\u8fc7\u5668\u4ef6\uff0c\u6240\u4ee5\u6b64\u671f\u95f4\u5b58\u5728\u663e\u8457\u7684\u5f00\u5173\u635f\u8017\u3002==>VGS\u5927\u4e8e\u9608\u503c\uff0cMOSFET\u5f00\u95f8\uff0c\u635f\u8017\u9012\u589e\uff0c\u9876\u70b9\u4e3a\u8f93\u51fa\u7535\u6d41\u6b63\u597d\u6ee1\u8db3\u8d1f\u8f7d\u9700\u6c42\u5904\u3002<\/p>\n
\n\t3\u3001\u5728\u65f6\u95f4\u6bb5 t3 \u671f\u95f4\uff0c Ids \u7535\u6d41\u4fdd\u6301\u6052\u5b9a\uff0c Vds \u7535\u538b\u5f00\u59cb\u4e0b\u964d\u3002\u867d\u7136\u6f0f - \u6e90\u7535\u538b\u5728\u4e0b\u964d\uff0c\u4f46\u51e0\u4e4e\u6240\u6709\u7684\u6805\u6781\u7535\u6d41\u90fd\u4e8e\u5bf9 CGD \u8fdb\u884c\u5145\u7535\u3002\u7531\u4e8e\u51e0\u4e4e\u6ca1\u6709\u6805\u6781\u7535\u6d41\u7528\u4e8e\u5bf9 CGS\u5145\u7535\uff0c\u6240\u4ee5\u6805 - \u6e90\u7535\u538b\u5728\u4e00\u4e2a\u79f0\u4e3a“\u5f00\u5173\u70b9”\u7535\u538b\uff08VSP\uff09\u7684\u7535\u538b\u4e0b\u4fdd\u6301\u76f8\u5bf9\u5e73\u5766\u3002\u8be5\u533a\u57df\u901a\u5e38\u79f0\u4e3a\u7c73\u52d2\u5e73\u5766\u533a\uff08Miller Plate<\/u>au\uff09\u3002\u5728\u6b64\u65f6\u95f4\u6bb5\u671f\u95f4\uff0c\u7c7b\u4f3c\u4e8e t2\uff0c\u4e5f\u5b58\u5728\u6f0f - \u6e90\u7535\u538b\u964d\uff0c\u5e76\u4e14\u6709\u663e\u8457\u7535\u6d41\u6d41\u8fc7\u5668\u4ef6\u3002\u56e0\u6b64\uff0ct3 \u662f\u5f00\u5173\u5468\u671f\u4f1a\u4ea7\u751f\u635f\u8017\u7684\u4e00\u4e2a\u65f6\u95f4\u6bb5\u3002==>VGS\u7535\u5e73\u8fdb\u5165\u50f5\u6301\u9636\u6bb5\uff0cMOSFET\u901a\u9053\u7684\u6df1\u5ea6\u52a0\u5f3a\uff0cVDS\u538b\u5dee\u4e0b\u964d\uff0c\u635f\u8017\u9012\u51cf\uff0c\u4e3a\u8f6c\u6298\u70b9\u3002<\/p>\n
\n\t4\u3001\u5728\u8d85\u51fa\u65f6\u95f4\u6bb5 t3 \u65f6\uff0cMOSFET \u901a\u9053\u589e\u5f3a\uff0c\u6700\u9ad8\u81f3 VGS\u8fbe\u5230\u5176\u6700\u5927\u503c\u7684\u7535\u538b\u70b9\u3002\u5f00\u5173\u635f\u8017\u5df2\u7ecf\u505c\u6b62\uff0c\u4f20\u5bfc\u635f\u8017\u5f00\u59cb\u51fa\u73b0\uff0c\u76f4\u5230\u4e0a\u6865\u81c2 MOSFET \u5173\u95ed\u4e3a\u6b62\u3002\u5173\u95ed\u4e8b\u4ef6\u7684\u60c5\u5f62\u662f\u975e\u5e38\u7c7b\u4f3c\u7684\uff0c\u4ee5\u5f00\u542f\u4e8b\u4ef6\u7684\u76f8\u53cd\u5f62\u5f0f\u53d1\u751f\u3002===>VGS\u7535\u5e73\u7a81\u7834\u50f5\u6301\u7ee7\u7eed\u4e0a\u5347\uff0cMOSFET\u7684\u901a\u9053\u7ee7\u7eed\u589e\u5f3a\uff0c\u5f00\u5173\u635f\u8017\u9000\u51fa\u821e\u53f0\uff0c\u4f20\u5bfc\u635f\u8017\u767b\u573a\u3002<\/p>\n
\n\tMOSFET\u7684\u5173\u95ed\u8fc7\u7a0b\u7684\u635f\u8017\u4e0e\u4e0a\u8ff0\u63cf\u8ff0\u7c7b\u4f3c\uff0c\u6b65\u9aa4\u76f8\u53cd\u800c\u5df2\uff0c\u6240\u4ee5\u5f00\u5173\u635f\u8017\u5305\u62ec\u5f00\u542f\u548c\u5173\u95ed\u4e24\u90e8\u5206\uff0c\u7ecf\u63d0\u70bc\u8ba1\u7b97\u516c\u5f0f\u5982\u4e0b\u3002<\/p>\n
\n\t<\/p>\n
\n\t\u540c\u6b65Buck\u8fd8\u6709\u4e00\u4e2a\u4e0b\u81c2MOSFET\uff0c\u4f46\u662f\u5b83\u662f\u63a5\u8fd1\u96f6\u7535\u538b\u5f00\u542f\u7684\u4e5f\u5c31\u662f\u6ca1\u6709\u50cf\u4e0a\u7ba1\u90a3\u6837\u4f1a\u6709\u5de8\u5927\u7684Vds\u538b\u5dee\uff0c\u6240\u4ee5\u4e0b\u81c2MOSFET\u7684\u5f00\u5173\u635f\u8017\u662f\u4e0d\u88ab\u8ba8\u8bba\u3002<\/p>\n
\n\t\uff08\u4e8c\uff09\u3001\u4f20\u5bfc\u635f\u8017\u7684\u8ba1\u7b97<\/p>\n
\n\t1\uff09\u3001MOSFET\u7684\u4f20\u5bfc\u635f\u8017\uff0c\u4e0a\u4e0b\u81c2MOSFET\u7684\u8868\u8ff0\u4e00\u81f4\u53ea\u662f\u6240\u5360\u65f6\u95f4\u6bb5\u4e0d\u4e00\u6837\uff0c\u7528\u5360\u7a7a\u6bd4\u533a\u5206\u3002<\/p>\n
\n\t\u4e0a\u81c2MOSFET\u7684\u4f20\u5bfc\u635f\u8017:<\/p>\n
\n\t<\/p>\n
\n\t\u4e0b\u81c2MOSFET\u7684\u4f20\u5bfc\u635f\u8017\uff08\u53ea\u9488\u5bf9\u540c\u6b65Buck\uff09:<\/p>\n
\n\t<\/p>\n
\n\t2\uff09\u3001\u7eed\u6d41\u4e8c\u6781\u7ba1\u7684\u4f20\u5bfc\u635f\u8017(\u53ea\u9488\u5bf9\u975e\u540c\u6b65Buck)<\/p>\n
\n\t<\/p>\n
\n\tVFD\u4e3a\u7eed\u6d41\u4e8c\u6781\u7ba1\u7684\u6b63\u5411\u5bfc\u901a\u538b\u964d\u3002<\/p>\n
\n\t3\uff09\u3001\u7535\u611f\u635f\u8017<\/p>\n
\n\t<\/p>\n
\n\t\u8bf7\u6ce8\u610f\uff0c\u8be5\u529f\u7387\u635f\u8017\u5e76\u4e0d\u53d6\u51b3\u4e8e\u5360\u7a7a\u6bd4\uff0c\u56e0\u4e3a\u7535\u611f\u603b\u662f\u8fdb\u884c\u4f20\u5bfc\u3002<\/p>\n
\n\t\uff08\u4e09\uff09\u3001\u5176\u5b83\u635f\u8017\u7684\u5206\u6790<\/p>\n
\n\tMOSFET\u9664\u4e86\u5f00\u5173\u548c\u4f20\u5bfc\u635f\u4e4b\u5916\uff0c\u8fd8\u6709\u5c11\u91cf\u635f\u8017\u7531\u4e8e\u5176\u5b83\u56e0\u7d20\u5f15\u8d77\u7684\uff0c\u56e0\u4e3a\u6240\u5360\u6bd4\u91cd\u8f83\u4f4e\uff0c\u6240\u4ee5\u5728\u975e\u7cbe\u786e\u8ba1\u7b97\u65f6\u4e00\u822c\u88ab\u5ffd\u7565\u3002<\/p>\n
\n\t1\uff09\u3001\u5bf9\u6805\u6781\u5bc4\u751f\u7535\u5bb9\u5145\u7535\u5f15\u8d77\u7684\u635f\u8017\uff0c\u4e0a\u4e0b\u81c2MOSFET\u7684\u8ba1\u7b97\u65b9\u5f0f\u4e00\u81f4\uff0c\u516c\u5f0f\u5982\u4e0b\uff1a<\/p>\n
\n\t<\/p>\n
\n\t2\uff09\u3001\u540c\u6b65Buck\u7684\u4e0b\u81c2MOSFET\u7684\u4f53\u4e8c\u6781\u7ba1\u7684\u53cd\u5411\u6062\u590d\u635f\u8017\uff1a<\/p>\n
\n\t<\/p>\n
\n\t3\uff09\u3001\u6bcf\u4e2a\u5f00\u5173\u5468\u671f\u5bf9\u4e0a\u4e0b\u81c2MOSFET\u7684\u8f93\u51fa\u7535\u5bb9Coss\uff08Cgd+Cds)\u8fdb\u884c\u5145\u7535\u5f15\u8d77\u7684\u635f\u8017\uff1a<\/p>\n
\n\t<\/p>\n
\n\t4\uff09\u3001\u5f53\u540c\u6b65\u964d\u538b\u8f6c\u6362\u5668<\/u>\u4e2d\u7684\u4e24\u4e2a\u5f00\u5173\u5747\u5173\u95ed\u65f6\uff0c\u4e0b\u6865\u81c2 MOSFET \u7684\u4f53\u4e8c\u6781\u7ba1\u5c06\u5f00\u542f\u3002\u5728\u6b64\u671f\u95f4\uff08\u79f0\u4e3a\u6b7b\u533a\uff08Dead Ti<\/u>me\uff0cDT\uff09\uff09\uff0c\u4f53\u4e8c\u6781\u7ba1\u4e2d\u5c06\u51fa\u73b0\u4f20\u5bfc\u635f\u8017\u3002\u8fd9\u4e9b\u635f\u8017\u53ef\u4ee5\u63cf\u8ff0\u4e3a\uff1a<\/p>\n
\n\t<\/p>\n
\n\t\u8bf7\u6ce8\u610f\uff0c\u8be5\u516c\u5f0f\u4e2d\u7684 DT \u5305\u542b\u4e0a\u5347\u6cbf\u548c\u4e0b\u964d\u6cbf\u4e4b\u548c\u3002<\/p>\n
\n\t5\uff09\u3001\u82af\u7247\u672c\u8eab\u635f\u8017<\/p>\n
\n\t<\/p>\n
\n\t\u4e09\u3001\u9ed1\u76d2\u548c\u767d\u76d2\u7684\u534f\u540c<\/p>\n
\n\t\u767d\u76d2\u548c\u9ed1\u76d2\u4e24\u79cd\u8ba1\u7b97\u65b9\u5f0f\u5404\u6709\u5343\u79cb\uff0c\u9ed1\u76d2\u65b9\u5f0f\u867d\u7b80\u5355\u7c97\u66b4\u4f46\u662f\u6709\u6548\uff0c\u767d\u76d2\u65b9\u5f0f\u867d\u7cbe\u6253\u7ec6\u7b97\u4f46\u662f\u5f88\u591a\u53c2\u6570\u65e0\u6cd5\u7cbe\u786e\u83b7\u5f97\u3002\u8b6c\u5982 RDS(ON) \u53d6\u51b3\u4e8e\u5668\u4ef6\u7684\u7ed3\u6e29\uff0c\u800c\u635f\u8017\u4f1a\u4f7f\u7ed3\u6e29\u5347\u9ad8\uff0c\u4e3a\u4e86\u5f97\u5230\u7cbe\u786e\u7684\u7ed3\u679c\uff0c\u9700\u8981\u8fdb\u884c\u8fed\u4ee3\u8ba1\u7b97\uff0c\u8fd9\u4e9b\u8fed\u4ee3\u5fc5\u987b\u6267\u884c\u5230\u5668\u4ef6\u7684\u7ed3\u6e29\u7a33\u5b9a\uff08\u901a\u5e38\u5230 < 1%\uff09\u4e3a\u6b62\uff0c\u8fd9\u65e0\u7591\u589e\u52a0\u4e86\u8ba1\u7b97\u7684\u590d\u6742\u6027\u548c\u96be\u5ea6\u3002<\/p>\n
\n\t\u5728\u5de5\u7a0b\u5e94\u7528\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u907f\u514d\u590d\u6742\u7684\u8ba1\u7b97\u516c\u5f0f\uff0c\u6240\u4ee5\u6bd4\u8f83\u7b80\u4fbf\u5b9e\u7528\u7684\u65b9\u5f0f\u662f\u5148\u7528\u9ed1\u76d2\u7684\u65b9\u5f0f\u8ba1\u7b97\u5f97\u5230\u7535\u6e90\u7684\u6574\u4f53\u8017\u6563\u529f\u7387\uff0c\u7136\u540e\u4f7f\u7528\u767d\u76d2\u65b9\u5f0f\u8ba1\u7b97\u5916\u56f4\u5173\u952e\u5668\u4ef6\u7684\u8017\u6563\u529f\u7387\uff0c\u4e24\u8005\u76f8\u51cf\u5c31\u662f\u5728\u82af\u7247\u4e0a\u8017\u6563\u7684\u529f\u7387\uff0c\u7136\u540e\u518d\u6839\u636e\u70ed\u7535\u963b\u7b49\u53c2\u6570\u8fdb\u884c\u70ed\u8017\u5206\u6790\u3002\u5f00\u5173\u7535\u6e90\u7684\u5173\u952e\u5916\u56f4\u5668\u4ef6\u4e00\u822c\u5c31\u662f\u7535\u611f\u3001\u7eed\u6d41\u4e8c\u6781\u7ba1\u6216MOSFET\uff0c\u6240\u4ee5\u8ba1\u7b97\u6bd4\u8f83\u7b80\u5355\u3002<\/p>\n
\n\t\u56db\u3001\u70ed\u8017\u5206\u6790<\/p>\n
\n\t\u8017\u6563\u529f\u7387\u7684\u8ba1\u7b97\u6700\u540e\u9700\u8981\u6362\u7b97\u4e3a\u70ed\u8017\u624d\u4f1a\u6709\u5b9e\u9645\u610f\u4e49\uff0c\u8fd9\u662f\u662f\u5426\u9700\u8981\u989d\u5916\u589e\u52a0\u6563\u70ed\u63aa\u65bd\u7684\u53c2\u8003\u4f9d\u636e\u3002<\/p>\n
\n\t\u8017\u6563\u529f\u7387\u4e0e\u70ed\u8017\u4e4b\u95f4\u7684\u8054\u7cfb\u7ebd\u5e26\u662f\u70ed\u963b\uff0c\u5982\u56fe1.7\u4e0e1.8\u6240\u793a\u3002<\/p>\n
\n\t<\/p>\n
\n\t\u56fe1.7 \u65e0\u6563\u70ed\u7247\u7684\u70ed\u963b<\/p>\n
\n\t<\/p>\n
\n\t\u56fe1.8 \u5e26\u6563\u70ed\u7247\u7684\u70ed\u963b\u8ba1\u7b97<\/p>\n
\n\t\u5728\u8fdb\u884c\u70ed\u8017\u5206\u6790\u65f6,\u6839\u636e\u5185\u6838\u81f3\u73af\u5883\u7684\u70ed\u963bRja\u53ca\u82af\u7247\u7684\u8017\u6563\u529f\u7387Pd\u53ef\u4f30\u7b97\u51fa\u82af\u7247\u5728\u7279\u5b9a\u7684\u73af\u5883\u6e29\u5ea6Ta\u4e0b\u7684\u5185\u6838\u6e29\u5ea6Tj\uff0c\u4ee5\u82af\u7247\u7684\u5185\u6838\u6e29\u5ea6Tj\u662f\u5426\u8d85\u8fc7\u4e86\u6781\u503cTjmax\u4f5c\u4e3a\u5224\u65ad\u82af\u7247\u662f\u5426\u5b89\u5168\u7684\u4f9d\u636e\u3002\u8ba1\u7b97\u516c\u5f0f\u5982\u4e0b\uff1a<\/p>\n
\n\t<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5b66\u7535\u6e90\u7535\u6e90\u770b\u8fd9\u91cc\uff0c\u8fd9\u6b21\u6211\u4eec\u5206\u4eab\u4e00\u4e0b \u5f00\u5173\u7535\u6e90 \u529f\u7387\u635f\u8017\u53ca\u70ed\u8017\u7684\u5de5\u7a0b\u4f30\u7b97\uff01 \u7535\u6e90\u5728\u4e3a\u8d1f\u8f7d\u63d0\u4f9b\u80fd\u91cf\u7684\u540c\u65f6\u4e5f\u5728\u71c3\u70e7\u81ea\u5df1\uff0c\u5728\u7535\u6e90\u8bbe\u8ba1\u65f6\u5927\u5bb6\u4f1a\u5f88\u4ed4\u7ec6\u7684\u53bb\u5206\u6790\u8d1f\u8f7d\u7684\u9700\u6c42\uff0c\u4f46\u662f\u5bb9\u6613<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"_links":{"self":[{"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/posts\/959"}],"collection":[{"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.szryc.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=959"}],"version-history":[{"count":0,"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/posts\/959\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.szryc.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=959"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.szryc.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=959"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.szryc.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=959"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}