{"id":16411,"date":"2024-01-07T16:45:51","date_gmt":"2024-01-07T08:45:51","guid":{"rendered":"http:\/\/www.szryc.com\/?p=16411"},"modified":"2024-01-07T16:45:51","modified_gmt":"2024-01-07T08:45:51","slug":"mos%e7%ae%a1%e6%8d%9f%e8%80%97%e7%9a%848%e4%b8%aa%e7%bb%84%e6%88%90%e9%83%a8%e5%88%86","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=16411","title":{"rendered":"MOS\u7ba1\u635f\u8017\u76848\u4e2a\u7ec4\u6210\u90e8\u5206"},"content":{"rendered":"

\u5f00\u5173\u6a21\u5f0f\u7535\u6e90<\/u>\uff08Switch Mode Power Supply\uff0c\u7b80\u79f0SMPS<\/u>\uff09\uff0c\u53c8\u79f0\u4ea4\u6362\u5f0f\u7535\u6e90\u3001\u5f00\u5173\u53d8\u6362\u5668\uff0c\u662f\u4e00\u79cd\u9ad8\u9891\u5316\u7535\u80fd\u8f6c\u6362\u88c5\u7f6e\uff0c\u662f\u7535\u6e90\u4f9b\u5e94\u5668\u7684\u4e00\u79cd\u3002\u5176\u529f\u80fd\u662f\u5c06\u4e00\u4e2a\u4f4d\u51c6\u7684\u7535\u538b\uff0c\u900f\u8fc7\u4e0d\u540c\u5f62\u5f0f\u7684\u67b6\u6784\u8f6c\u6362\u4e3a\u7528\u6237\u7aef\u6240\u9700\u6c42\u7684\u7535\u538b\u6216\u7535\u6d41<\/u>\u3002\u5f00\u5173\u7535\u6e90<\/u>\u7684\u8f93\u5165\u591a\u534a\u662f\u4ea4\u6d41\u7535\u6e90\uff08\u4f8b\u5982\u5e02\u7535\uff09\u6216\u662f\u76f4\u6d41\u7535\u6e90\uff0c\u800c\u8f93\u51fa\u591a\u534a\u662f\u9700\u8981\u76f4\u6d41\u7535\u6e90\u7684\u8bbe\u5907\uff0c\u4f8b\u5982\u4e2a\u4eba\u7535\u8111<\/u>\uff0c\u800c\u5f00\u5173\u7535\u6e90\u5c31\u8fdb\u884c\u4e24\u8005\u4e4b\u95f4\u7535\u538b\u53ca\u7535\u6d41\u7684\u8f6c\u6362\u3002<\/p>\n

\u5f00\u5173\u635f\u8017\u5305\u62ec\u5bfc\u901a\u635f\u8017\u548c\u622a\u6b62\u635f\u8017\u3002\u5bfc\u901a\u635f\u8017\u6307\u529f\u7387\u7ba1\u4ece\u622a\u6b62\u5230\u5bfc\u901a\u65f6\uff0c\u6240\u4ea7\u751f\u7684\u529f\u7387\u635f\u8017\u3002\u622a\u6b62\u635f\u8017\u6307\u529f\u7387\u7ba1\u4ece\u5bfc\u901a\u5230\u622a\u6b62\u65f6\uff0c\u6240\u4ea7\u751f\u7684\u529f\u7387\u635f\u8017\u3002\u5f00\u5173\u635f\u8017\uff08Switching-Loss\uff09\u5305\u62ec\u5f00\u901a\u635f\u8017\uff08Turn-on Loss\uff09\u548c\u5173\u65ad\u635f\u8017\uff08Turn-of Loss\uff09\uff0c\u5e38\u5e38\u5728\u786c\u5f00\u5173\uff08Hard-Switching\uff09\u548c\u8f6f\u5f00\u5173\uff08Soft-Switching\uff09\u4e2d\u8ba8\u8bba\u3002\u6240\u8c13\u5f00\u901a\u635f\u8017\uff08Turn-on Loss\uff09\uff0c\u662f\u6307\u975e\u7406\u60f3\u7684\u5f00\u5173\u7ba1\u5728\u5f00\u901a\u65f6\uff0c\u5f00\u5173\u7ba1\u7684\u7535\u538b\u4e0d\u662f\u7acb\u5373\u4e0b\u964d\u5230\u96f6\uff0c\u800c\u662f\u6709\u4e00\u4e2a\u4e0b\u964d\u65f6\u95f4\uff0c\u540c\u65f6\u5b83\u7684\u7535\u6d41\u4e5f\u4e0d\u662f\u7acb\u5373\u4e0a\u5347\u5230\u8d1f\u8f7d\u7535\u6d41\uff0c\u4e5f\u6709\u4e00\u4e2a\u4e0a\u5347\u65f6\u95f4\u3002\u5728\u8fd9\u6bb5\u65f6\u95f4\u5185\uff0c\u5f00\u5173\u7ba1\u7684\u7535\u6d41\u548c\u7535\u538b\u6709\u4e00\u4e2a\u4ea4\u53e0\u533a\uff0c\u4f1a\u4ea7\u751f\u635f\u8017\uff0c\u8fd9\u4e2a\u635f\u8017\u5373\u4e3a\u5f00\u901a\u635f\u8017\u3002\u4ee5\u6b64\u7c7b\u6bd4\uff0c\u53ef\u4ee5\u5f97\u51fa\u5173\u65ad\u635f\u8017\u4ea7\u751f\u7684\u539f\u56e0\uff0c\u8fd9\u91cc\u4e0d\u518d\u8d58\u8ff0\u3002\u5f00\u5173\u635f\u8017\u53e6\u4e00\u4e2a\u610f\u601d\u662f\u6307\u5728\u5f00\u5173\u7535\u6e90\u4e2d\uff0c\u5bf9\u5927\u7684MOS\u7ba1\u8fdb\u884c\u5f00\u5173\u64cd\u4f5c\u65f6\uff0c\u9700\u8981\u5bf9\u5bc4\u751f\u7535\u5bb9<\/u>\u5145\u653e\u7535\uff0c\u8fd9\u6837\u4e5f\u4f1a\u5f15\u8d77\u635f\u8017\u3002<\/p>\n

\"pIYBAF0IoIuAFCg5AAIIcrUhEmU762-1\"<\/p>\n

MOS\u7ba1\u635f\u8017\u76848\u4e2a\u7ec4\u6210\u90e8\u5206<\/h2>\n

\u5728\u5668\u4ef6\u8bbe\u8ba1\u9009\u62e9\u8fc7\u7a0b\u4e2d\u9700\u8981\u5bf9\u00a0MOSFET<\/u>\u00a0\u7684\u5de5\u4f5c\u8fc7\u7a0b\u635f\u8017\u8fdb\u884c\u5148\u671f\u8ba1\u7b97\uff08\u6240\u8c13\u5148\u671f\u8ba1\u7b97\u662f\u6307\u5728\u6ca1\u80fd\u591f\u6d4b\u8bd5\u5404\u5de5\u4f5c\u6ce2\u5f62\u7684\u60c5\u51b5\u4e0b\uff0c\u5229\u7528\u5668\u4ef6\u89c4\u683c<\/u>\u4e66\u63d0\u4f9b\u7684\u53c2\u6570<\/u>\u53ca\u5de5\u4f5c\u7535\u8def\u7684\u8ba1\u7b97\u503c\u548c\u9884\u8ba1\u6ce2\u5f62\uff0c\u5957\u7528\u516c\u5f0f\u8fdb\u884c\u7406\u8bba\u4e0a\u7684\u8fd1\u4f3c\u8ba1\u7b97\uff09\u3002<\/p>\n

MOSFET \u7684\u5de5\u4f5c\u635f\u8017\u57fa\u672c\u53ef\u5206\u4e3a\u5982\u4e0b\u51e0\u90e8\u5206\uff1a<\/p>\n

1 \u5bfc\u901a\u635f\u8017Pon<\/p>\n

\u5bfc\u901a\u635f\u8017\uff0c\u6307\u5728 MOSFET \u5b8c\u5168\u5f00\u542f\u540e\u8d1f\u8f7d\u7535\u6d41\uff08\u5373\u6f0f\u6e90\u7535\u6d41\uff09 IDS\uff08on\uff09\uff08t\uff09\u5728\u5bfc\u901a\u7535\u963b RDS\uff08on\uff09\u4e0a\u4ea7\u751f\u4e4b\u538b\u964d\u9020\u6210\u7684\u635f\u8017\u3002<\/p>\n

\u5bfc\u901a\u635f\u8017\u8ba1\u7b97<\/p>\n

\u5148\u901a\u8fc7\u8ba1\u7b97\u5f97\u5230 IDS\uff08on\uff09\uff08t\uff09\u51fd\u6570\u8868\u8fbe\u5f0f\u5e76\u7b97\u51fa\u5176\u6709\u6548\u503c IDS\uff08on\uff09rms<\/u>\uff0c\u518d\u901a\u8fc7\u5982\u4e0b\u7535\u963b<\/u>\u635f\u8017\u8ba1\u7b97\u5f0f\u8ba1\u7b97\uff1a<\/p>\n

Pon=IDS\uff08on\uff09rms2\u00d7 RDS\uff08on\uff09\u00d7 K \u00d7 Don<\/p>\n

\u8bf4\u660e<\/p>\n

\u8ba1\u7b97 IDS\uff08on\uff09rms\u65f6\u4f7f\u7528\u7684\u65f6\u671f\u4ec5\u662f\u5bfc\u901a\u65f6\u95f4 Ton \uff0c\u800c\u4e0d\u662f\u6574\u4e2a\u5de5\u4f5c\u5468\u671f Ts \uff1b RDS\uff08on\uff09 \u4f1a\u968f IDS\uff08on\uff09\uff08t\uff09\u503c\u548c\u5668\u4ef6\u7ed3\u70b9\u6e29\u5ea6\u4e0d\u540c\u800c\u6709\u6240\u4e0d\u540c\uff0c\u6b64\u65f6\u7684\u539f\u5219\u662f\u6839\u636e\u89c4\u683c\u4e66\u67e5\u627e\u5c3d\u91cf\u9760\u8fd1\u9884\u8ba1\u5de5\u4f5c\u6761\u4ef6\u4e0b\u7684 RDS\uff08on\uff09 \u503c\uff08\u5373\u4e58\u4ee5\u89c4\u683c\u4e66\u63d0\u4f9b\u7684\u4e00\u4e2a\u6e29\u5ea6\u7cfb\u6570 K \uff09\u3002<\/p>\n

2 \u622a\u6b62\u635f\u8017Poff<\/p>\n

\u622a\u6b62\u635f\u8017\uff0c\u6307\u5728 MOSFET \u5b8c\u5168\u622a\u6b62\u540e\u5728\u6f0f\u6e90\u7535\u538b VDS\uff08off\uff09 \u5e94\u529b\u4e0b\u4ea7\u751f\u7684\u6f0f\u7535\u6d41 IDSS\u9020\u6210\u7684\u635f\u8017\u3002<\/p>\n

\u622a\u6b62\u635f\u8017\u8ba1\u7b97<\/p>\n

\u5148\u901a\u8fc7\u8ba1\u7b97\u5f97\u5230 MOSFET \u622a\u6b62\u65f6\u6240\u627f\u53d7\u7684\u6f0f\u6e90\u7535\u538b VDS\uff08off\uff09 \uff0c\u5728\u67e5\u627e\u5668\u4ef6\u89c4\u683c\u4e66\u63d0\u4f9b\u4e4b IDSS \uff0c\u518d\u901a\u8fc7\u5982\u4e0b\u516c\u5f0f\u8ba1\u7b97\uff1a<\/p>\n

Poff=VDS\uff08off\uff09\u00d7 IDSS\u00d7\uff08 1-Don\uff09<\/p>\n

\u8bf4\u660e<\/p>\n

IDSS \u4f1a\u4f9d VDS\uff08off\uff09 \u53d8\u5316\u800c\u53d8\u5316\uff0c\u800c\u89c4\u683c\u4e66\u63d0\u4f9b\u7684\u6b64\u503c\u662f\u5728\u4e00\u8fd1\u4f3c V\uff08BR\uff09DSS\u6761\u4ef6\u4e0b\u7684\u53c2\u6570\u3002\u5982\u8ba1\u7b97\u5f97\u5230\u7684\u6f0f\u6e90\u7535\u538b VDS\uff08off\uff09\u5f88\u5927\u4ee5\u81f3\u63a5\u8fd1 V\uff08BR\uff09DSS\u5219\u53ef\u76f4\u63a5\u5f15\u7528\u6b64\u503c\uff0c\u5982\u5f88\u5c0f\uff0c\u5219\u53ef\u53d6\u96f6\u503c\uff0c\u5373\u5ffd\u7565\u6b64\u9879\u3002<\/p>\n

3 \u5f00\u542f\u8fc7\u7a0b\u635f\u574f<\/p>\n

\u5f00\u542f\u8fc7\u7a0b\u635f\u8017\uff0c\u6307\u5728 MOSFET \u5f00\u542f\u8fc7\u7a0b\u4e2d\u9010\u6e10\u4e0b\u964d\u7684\u6f0f\u6e90\u7535\u538b VDS\uff08off_on\uff09\uff08t\uff09\u4e0e\u9010\u6e10\u4e0a\u5347\u7684\u8d1f\u8f7d\u7535\u6d41\uff08\u5373\u6f0f\u6e90\u7535\u6d41\uff09 IDS\uff08off_on\uff09\uff08t\uff09\u4ea4\u53c9\u91cd\u53e0\u90e8\u5206\u9020\u6210\u7684\u635f\u8017\u3002<\/p>\n

\"pIYBAF0IoLiAGMOMAABjRcWkgO4924\"<\/p>\n

\u5f00\u542f\u8fc7\u7a0b\u635f\u8017\u8ba1\u7b97<\/p>\n

\u5f00\u542f\u8fc7\u7a0b VDS\uff08off_on\uff09\uff08t\uff09 \u4e0e IDS\uff08off_on\uff09\uff08t\uff09 \u4ea4\u53c9\u6ce2\u5f62\u5982\u4e0a\u56fe\u6240\u793a\u3002\u9996\u5148\u987b\u8ba1\u7b97\u6216\u9884\u8ba1\u5f97\u5230\u5f00\u542f\u65f6\u523b\u524d\u4e4b VDS\uff08off_end\uff09\u3001\u5f00\u542f\u5b8c\u6210\u540e\u7684 IDS\uff08on_beginning\uff09\u5373\u56fe\u793a\u4e4b Ip1\uff0c\u4ee5\u53ca VDS\uff08off_on\uff09\uff08t\uff09 \u4e0e IDS\uff08off_on\uff09\uff08t\uff09 \u91cd\u53e0\u65f6\u95f4 Tx\u3002\u7136\u540e\u518d\u901a\u8fc7\u5982\u4e0b\u516c\u5f0f\u8ba1\u7b97\uff1a<\/p>\n

Poff_on= fs\u00d7\u222b TxVDS\uff08off_on\uff09\uff08t\uff09 \u00d7 ID\uff08off_on\uff09\uff08t\uff09 \u00d7 dt<\/p>\n

\u5b9e\u9645\u8ba1\u7b97\u4e2d\u4e3b\u8981\u6709\u4e24\u79cd\u5047\u8bbe \u2014 \u56fe \uff08A\uff09 \u90a3\u79cd\u5047\u8bbe\u8ba4\u4e3a VDS\uff08off_on\uff09\uff08t\uff09\u7684\u5f00\u59cb\u4e0b\u964d\u4e0e ID\uff08off_on\uff09\uff08t\uff09\u7684\u9010\u6e10\u4e0a\u5347\u540c\u65f6\u53d1\u751f\uff1b\u56fe \uff08B\uff09 \u90a3\u79cd\u5047\u8bbe\u8ba4\u4e3a VDS\uff08off_on\uff09\uff08t\uff09\u7684\u4e0b\u964d\u662f\u4ece ID\uff08off_on\uff09\uff08t\uff09\u4e0a\u5347\u5230\u6700\u5927\u503c\u540e\u624d\u5f00\u59cb\u3002\u56fe \uff08C\uff09 \u662f FLYBAC<\/u>K \u67b6\u6784\u8def\u4e2d\u4e00 MOSFET \u5b9e\u9645\u6d4b\u8bd5\u5230\u7684\u6ce2\u5f62\uff0c\u5176\u66f4\u63a5\u8fd1\u4e8e \uff08A\uff09 \u7c7b\u5047\u8bbe\u3002\u9488\u5bf9\u8fd9\u4e24\u79cd\u5047\u8bbe\u5ef6\u4f38\u51fa\u4e24\u79cd\u8ba1\u7b97\u516c\u5f0f\uff1a<\/p>\n

\uff08A\uff09 \u7c7b\u5047\u8bbe Poff_on=1\/6 \u00d7 VDS\uff08off_end\uff09 \u00d7 Ip1\u00d7 tr \u00d7 fs<\/p>\n

\uff08B\uff09 \u7c7b\u5047\u8bbe Poff_on=1\/2 \u00d7 VDS\uff08off_end\uff09 \u00d7 Ip1 \u00d7 \uff08td\uff08on\uff09+tr\uff09 \u00d7 fs<\/p>\n

\uff08B\uff09 \u7c7b\u5047\u8bbe\u53ef\u4f5c\u4e3a\u6700\u6076\u52a3\u6a21\u5f0f\u7684\u8ba1\u7b97\u503c\u3002<\/p>\n

\u8bf4\u660e\uff1a<\/p>\n

\u56fe \uff08C\uff09 \u7684\u5b9e\u9645\u6d4b\u8bd5\u5230\u6ce2\u5f62\u53ef\u4ee5\u770b\u5230\u5f00\u542f\u5b8c\u6210\u540e\u7684 IDS\uff08on_beginning\uff09\u300b\u300bIp1\uff08\u7535\u6e90\u4f7f\u7528\u4e2d Ip1 \u53c2\u6570\u5f80\u5f80\u662f\u6fc0\u78c1\u7535\u6d41\u7684 \u521d\u59cb\u503c\uff09\u3002\u53e0\u52a0\u7684\u7535\u6d41\u6ce2\u5cf0\u786e\u5207\u6570\u503c\u6211\u4eec\u96be\u4ee5\u9884\u8ba1\u5f97\u5230\uff0c\u5176 \u8ddf\u7535\u8def\u67b6\u6784\u548c\u5668\u4ef6\u53c2\u6570\u6709\u5173\u3002\u4f8b\u5982 FLYBACK \u4e2d \u5b9e\u9645\u7535\u6d41\u5e94 \u662f Itotal=Idp1+Ia+Ib \uff08Ia \u4e3a\u6b21\u7ea7\u7aef\u6574\u6d41\u4e8c\u6781\u7ba1<\/u>\u7684\u53cd\u5411\u6062 \u590d\u7535\u6d41\u611f\u5e94\u56de\u521d\u6781\u7684\u7535\u6d41\u503c -- \u5373\u4e58\u4ee5\u531d\u6bd4\uff0c Ib \u4e3a\u53d8\u538b\u5668 \u521d\u7ea7\u4fa7\u7ed5\u7ec4\u5c42\u95f4\u5bc4\u751f\u7535\u5bb9\u5728 MOSFET \u5f00\u5173\u5f00\u901a\u77ac\u95f4\u91ca\u653e\u7684 \u7535\u6d41 \uff09 \u3002\u8fd9\u4e2a\u96be\u4ee5\u9884\u8ba1\u7684\u6570\u503c\u4e5f\u662f\u9020\u6210\u6b64\u90e8\u5206\u8ba1\u7b97\u8bef\u5dee\u7684 \u4e3b\u8981\u539f\u56e0\u4e4b\u4e00\u3002<\/p>\n

4 \u5173\u65ad\u8fc7\u7a0b\u635f\u8017<\/p>\n

\u5173\u65ad\u8fc7\u7a0b\u635f\u8017\u3002\u6307\u5728 MOSFET \u5173\u65ad\u8fc7\u7a0b\u4e2d \u9010\u6e10\u4e0a\u5347\u7684\u6f0f\u6e90\u7535\u538b VDS\uff08on_off\uff09 \uff08t\uff09\u4e0e\u9010\u6e10 \u4e0b\u964d\u7684\u6f0f\u6e90\u7535\u6d41 IDS\uff08on_off\uff09\uff08t\uff09\u7684\u4ea4\u53c9\u91cd \u53e0\u90e8\u5206\u9020\u6210\u7684\u635f\u8017\u3002<\/p>\n

\"pIYBAF0IoLiAeki4AABM1ziW494384\"<\/p>\n

\u5173\u65ad\u8fc7\u7a0b\u635f\u8017\u8ba1\u7b97<\/p>\n

\u5982\u4e0a\u56fe\u6240\u793a\uff0c\u6b64\u90e8\u5206\u635f\u8017\u8ba1\u7b97\u539f\u7406\u53ca\u65b9\u6cd5\u8ddf Poff_on\u7c7b\u4f3c\u3002 \u9996\u5148\u987b\u8ba1\u7b97\u6216\u9884\u8ba1\u5f97\u5230\u5173\u65ad\u5b8c\u6210\u540e\u4e4b\u6f0f\u6e90\u7535\u538b VDS\uff08off_beginning\uff09\u3001\u5173\u65ad\u65f6\u523b\u524d\u7684\u8d1f\u8f7d\u7535\u6d41 IDS\uff08on_end\uff09\u5373\u56fe\u793a\u4e4b Ip2 \u4ee5\u53ca VDS\uff08on_off\uff09 \uff08t\uff09\u4e0e IDS\uff08on_off\uff09\uff08t\uff09\u91cd\u53e0\u65f6\u95f4 Tx \u3002\u7136\u540e\u518d\u901a\u8fc7 \u5982\u4e0b\u516c\u5f0f\u8ba1\u7b97\uff1a<\/p>\n

Poff_on= fs\u00d7\u222b TxVDS\uff08on_off\uff09\uff08t\uff09 \u00d7 IDS\uff08on_off\uff09\uff08t\uff09 \u00d7 dt<\/p>\n

\u5b9e\u9645\u8ba1\u7b97\u4e2d\uff0c\u9488\u5bf9\u8fd9\u4e24\u79cd\u5047\u8bbe\u5ef6\u4f38\u51fa\u4e24\u4e2a\u8ba1\u7b97\u516c\u5f0f\uff1a<\/p>\n

\uff08A\uff09 \u7c7b\u5047\u8bbe Poff_on=1\/6 \u00d7 VDS\uff08off_beginning\uff09 \u00d7 Ip2 \u00d7\u00a0tf<\/u>\u00a0\u00d7 fs<\/p>\n

\uff08B\uff09 \u7c7b\u5047\u8bbe Poff_on=1\/2 \u00d7 VDS\uff08off_beginning\uff09 \u00d7 Ip2 \u00d7 \uff08td\uff08off\uff09+tf\uff09 \u00d7 fs<\/p>\n

\uff08B\uff09 \u7c7b\u5047\u8bbe\u53ef\u4f5c\u4e3a\u6700\u6076\u52a3\u6a21\u5f0f\u7684\u8ba1\u7b97\u503c\u3002<\/p>\n

\u8bf4\u660e\uff1a<\/p>\n

IDS\uff08on_end\uff09 =Ip2\uff0c\u7535\u6e90\u4f7f\u7528\u4e2d\u8fd9\u4e00\u53c2\u6570\u5f80\u5f80\u662f\u6fc0\u78c1\u7535\u6d41 \u7684\u672b\u7aef\u503c\u3002\u56e0\u6f0f\u611f\u7b49\u56e0\u7d20\uff0c MOSFET \u5728\u5173\u65ad\u5b8c\u6210\u540e\u4e4b VDS\uff08off_beginning\uff09\u5f80\u5f80\u90fd\u6709\u4e00\u4e2a\u5f88\u5927\u7684\u7535\u538b\u5c16\u5cf0 Vspike \u53e0\u52a0\u5176 \u4e0a\uff0c\u6b64\u503c\u53ef\u5927\u81f4\u6309\u7ecf\u9a8c\u4f30\u7b97\u3002<\/p>\n

5 \u9a71\u52a8\u635f\u574fPgs<\/p>\n

\u9a71\u52a8\u635f\u8017\uff0c\u6307\u6805\u6781\u63a5\u53d7\u9a71\u52a8\u7535\u6e90\u8fdb\u884c\u9a71\u52a8\u9020\u6210\u4e4b\u635f\u8017<\/p>\n

\u9a71\u52a8\u635f\u8017\u7684\u8ba1\u7b97<\/p>\n

\u786e\u5b9a\u9a71\u52a8\u7535\u6e90\u7535\u538b Vgs\u540e\uff0c\u53ef\u901a\u8fc7\u5982\u4e0b\u516c\u5f0f\u8fdb\u884c\u8ba1\u7b97\uff1a<\/p>\n

Pgs= Vgs \u00d7 Qg \u00d7 fs<\/p>\n

\u8bf4\u660e<\/p>\n

Qg \u4e3a\u603b\u9a71\u52a8\u7535\u91cf\uff0c\u53ef\u901a\u8fc7\u5668\u4ef6\u89c4\u683c\u4e66\u67e5\u627e\u5f97\u5230\u3002<\/p>\n

6 Coss\u7535\u5bb9\u7684\u6cc4\u653e\u635f\u8017Pds<\/p>\n

Coss\u7535\u5bb9\u7684\u6cc4\u653e\u635f\u574f\uff0c\u6307MOS\u8f93\u51fa\u7535\u5bb9 Coss \u622a\u6b62\u671f\u95f4\u50a8\u84c4\u7684\u7535\u573a\u80fd\u4e8e\u5bfc\u540c\u671f\u95f4\u5728\u6f0f\u6e90\u6781\u4e0a\u7684\u6cc4\u653e\u635f\u8017\u3002<\/p>\n

Coss\u7535\u5bb9\u7684\u6cc4\u653e\u635f\u8017\u8ba1\u7b97<\/p>\n

\u9996\u5148\u987b\u8ba1\u7b97\u6216\u9884\u8ba1\u5f97\u5230\u5f00\u542f\u65f6\u523b\u524d\u4e4b VDS\uff0c\u518d\u901a\u8fc7\u5982\u4e0b\u516c\u5f0f\u8fdb\u884c\u8ba1\u7b97\uff1a<\/p>\n

Pds=1\/2 \u00d7 VDS\uff08off_end\uff092\u00d7 Coss \u00d7 fs<\/p>\n

\u8bf4\u660e<\/p>\n

Coss \u4e3a MOSFET \u8f93\u51fa\u7535\u5bb9\uff0c\u4e00\u822c\u53ef\u7b49\u4e8e Cds \uff0c\u6b64\u503c\u53ef\u901a\u8fc7\u5668\u4ef6\u89c4\u683c\u4e66\u67e5\u627e\u5f97\u5230\u3002<\/p>\n

7 \u4f53\u5185\u5bc4\u751f\u4e8c\u6781\u7ba1<\/u>\u6b63\u5411\u5bfc\u901a\u635f\u8017Pd_f<\/p>\n

\u4f53\u5185\u5bc4\u751f\u4e8c\u6781\u7ba1\u6b63\u5411\u5bfc\u901a\u635f\u8017\uff0c\u6307MOS\u4f53\u5185\u5bc4\u751f\u4e8c\u6781\u7ba1\u5728\u627f\u8f7d\u6b63\u5411\u7535\u6d41\u65f6\u56e0\u6b63\u5411\u538b\u964d\u9020\u6210\u7684\u635f\u8017\u3002<\/p>\n

\u4f53\u5185\u5bc4\u751f\u4e8c\u6781\u7ba1\u6b63\u5411\u5bfc\u901a\u635f\u8017\u8ba1\u7b97<\/p>\n

\u5728\u4e00\u4e9b\u5229\u7528\u4f53\u5185\u5bc4\u751f\u4e8c\u6781\u7ba1\u8fdb\u884c\u8f7d\u6d41\u7684\u5e94\u7528\u4e2d\uff08\u4f8b\u5982\u540c\u6b65\u6574\u6d41<\/u>\uff09\uff0c\u9700\u8981\u5bf9\u6b64\u90e8\u5206\u4e4b\u635f\u8017\u8fdb\u884c\u8ba1\u7b97\u3002\u516c\u5f0f\u5982\u4e0b\uff1a<\/p>\n

Pd_f = IF \u00d7 VDF \u00d7 tx \u00d7 fs<\/p>\n

\u5176\u4e2d\uff1a IF \u4e3a\u4e8c\u6781\u7ba1\u627f\u8f7d\u7684\u7535\u6d41\u91cf\uff0c VDF \u4e3a\u4e8c\u6781\u7ba1\u6b63\u5411\u5bfc\u901a\u538b\u964d\uff0c tx \u4e3a\u4e00\u5468\u671f\u5185\u4e8c\u6781\u7ba1\u627f\u8f7d\u7535\u6d41\u7684\u65f6\u95f4\u3002<\/p>\n

\u8bf4\u660e<\/p>\n

\u4f1a\u56e0\u5668\u4ef6\u7ed3\u6e29\u53ca\u627f\u8f7d\u7684\u7535\u6d41\u5927\u5c0f\u4e0d\u540c\u800c\u4e0d\u540c\u3002\u53ef\u6839\u636e\u5b9e\u9645\u5e94\u7528\u73af\u5883\u5728\u5176\u89c4\u683c\u4e66\u4e0a\u67e5\u627e\u5230\u5c3d\u91cf\u63a5\u8fd1\u4e4b\u6570\u503c\u3002<\/p>\n

8 \u4f53\u5185\u5bc4\u751f\u4e8c\u6781\u7ba1\u53cd\u5411\u6062\u590d\u635f\u8017Pd_recover<\/p>\n

\u4f53\u5185\u5bc4\u751f\u4e8c\u6781\u7ba1\u53cd\u5411\u6062\u590d\u635f\u8017\uff0c\u6307MOS\u4f53\u5185\u5bc4\u751f\u4e8c\u6781\u7ba1\u5728\u627f\u8f7d\u6b63\u5411\u7535\u6d41\u540e\u56e0\u53cd\u5411\u538b\u81f4\u4f7f\u7684\u53cd\u5411\u6062\u590d\u9020\u6210\u7684\u635f\u8017\u3002<\/p>\n

\u4f53\u5185\u5bc4\u751f\u4e8c\u6781\u7ba1\u53cd\u5411\u6062\u590d\u635f\u8017\u8ba1\u7b97<\/p>\n

\u8fd9\u4e00\u635f\u8017\u539f\u7406\u53ca\u8ba1\u7b97\u65b9\u6cd5\u4e0e\u666e\u901a\u4e8c\u6781\u7ba1\u7684\u53cd\u5411\u6062\u590d\u635f\u8017\u4e00\u6837\u3002\u516c\u5f0f\u5982\u4e0b\uff1a<\/p>\n

Pd_recover=VDR \u00d7 Qrr \u00d7 fs<\/p>\n

\u5176\u4e2d\uff1a VDR \u4e3a\u4e8c\u6781\u7ba1\u53cd\u5411\u538b\u964d\uff0c Qrr \u4e3a\u4e8c\u6781\u7ba1\u53cd\u5411\u6062\u590d\u7535\u91cf\uff0c\u7531\u5668\u4ef6\u63d0\u4f9b\u4e4b\u89c4\u683c\u4e66\u4e2d\u67e5\u627e\u800c\u5f97\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u5f00\u5173\u6a21\u5f0f\u7535\u6e90\uff08Switch Mode Power Supply\uff0c\u7b80\u79f0SMPS\uff09\uff0c\u53c8\u79f0\u4ea4\u6362\u5f0f\u7535\u6e90\u3001\u5f00\u5173\u53d8\u6362\u5668\uff0c\u662f […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"_links":{"self":[{"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/posts\/16411"}],"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=16411"}],"version-history":[{"count":1,"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/posts\/16411\/revisions"}],"predecessor-version":[{"id":16417,"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/posts\/16411\/revisions\/16417"}],"wp:attachment":[{"href":"http:\/\/www.szryc.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=16411"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.szryc.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=16411"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.szryc.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=16411"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}