{"id":8307,"date":"2023-12-11T08:03:51","date_gmt":"2023-12-11T08:03:51","guid":{"rendered":"https:\/\/fuhua.heniw.com\/?p=8307"},"modified":"2024-01-23T04:14:46","modified_gmt":"2024-01-23T04:14:46","slug":"%e7%94%b5%e6%ba%90%e4%ba%a7%e5%93%81%e7%9a%84%e7%a9%ba%e8%bd%bd%e5%8a%9f%e8%80%97%e8%b0%83%e8%af%95","status":"publish","type":"post","link":"https:\/\/www.fuli1qu2qu.com\/%e7%94%b5%e6%ba%90%e4%ba%a7%e5%93%81%e7%9a%84%e7%a9%ba%e8%bd%bd%e5%8a%9f%e8%80%97%e8%b0%83%e8%af%95\/","title":{"rendered":"\u7535\u6e90\u4ea7\u54c1\u7684\u7a7a\u8f7d\u529f\u8017\u8c03\u8bd5","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\u5728\u73b0\u5728\u9700\u8981\u7535\u6e90\u7ba1\u7406\u548c\u8282\u7701\u80fd\u91cf\u7684\u65f6\u4ee3\uff0c\u964d\u4f4e\u7535\u6e90\u4f9b\u5e94\u5668\u5728\u5f85\u673a\u65f6\u7684\u7535\u80fd\u6d88\u8017\u8d8a\u6765\u8d8a\u91cd\u8981\u3002\u5df2\u7ecf\u6709\u4e00\u4e9b\u53ef\u4ee5\u964d\u4f4e\u5207\u6362\u7535\u6e90\u4f9b\u5e94\u5668\u5728\u6781\u8f7b\u8f7d\u6216\u65e0\u8f7d\u65f6\u4e4b\u5207\u6362\u635f\u5931\u548c\u5176\u4ed6\u989d\u5b9a\u635f\u5931\u7684\u5b9e\u9645\u65b9\u6cd5\u88ab\u63d0\u51fa\u6765\u3002\u672c\u7bc7\u8bba\u6587\u63a2\u8ba8\u8109\u885d\u7701\u7565\u6a21\u5f0f(pulse skipping)\u3001\u8109\u885d\u6a21\u5f0f(burst mode)\u53ca\u975e\u5bfc\u901a\u65f6\u95f4\u8c03\u53d8(off time modulation)\u3002\u6b64\u5916\uff0c\u4e5f\u4ecb\u7ecd\u964d\u4f4e\u555f\u52a8\u7535\u6d41\u548c\u5176\u4ed6\u635f\u5931\u7684\u6280\u672f\u3002\u00a0
\n\u635f\u5931\u5206\u6790\u00a0
\n\u4ee5\u56fe\u4e00\u4e2d\u5178\u578b\u7684\u53cd\u9a70\u8f6c\u6362\u5668(flyback converter)\u70ba\u4f8b\uff0c\u53bb\u5206\u6790\u7535\u6e90\u8f6c\u6362\u5668\u7684\u635f\u5931\u3002\u56e0\u70ba\u53cd\u9a70\u8f6c\u6362\u5668\u4f4e\u4ef7\u4f4d\u548c\u5e7f\u6cdb\u7684\u8f93\u5165\u8303\u56f4\u7684\u7279\u6027\uff0c\u5728\u5b9e\u9645\u5e94\u7528\u5c42\u9762\u53d7\u5230\u6b22\u8fce\u3002\u5bf9\u4e00\u4e2a\u53cd\u9a70\u8f6c\u6362\u5668\u800c\u8a00\uff0c\u4e3b\u8981\u7684\u635f\u5931\u5305\u62ec\u4e86\u4f20\u5bfc\u635f\u5931(conduction loss)\u548c\u5207\u6362\u635f\u5931(switching loss)\uff0c\u4ee5\u53ca\u7531\u63a7\u5236\u7535\u8def\u6240\u9020\u6210\u7684\u635f\u5931\u3002\u8868\u4e8c\u3001\u4e09\u3001\u56db\u5206\u522b\u5bf9\u8fd9\u4e9b\u4e3b\u8981\u635f\u5931\uff0c\u5305\u62ec\u4e3b\u8981\u7684\u4f20\u5bfc\u635f\u5931\u548c\u5207\u6362\u635f\u5931\uff0c\u63a7\u5236\u7535\u8def\u6240\u9020\u6210\u7684\u635f\u5931\uff0c\u5217\u51fa\u4e86\u5927\u7ea6\u7684\u4f30\u7b97\u548c\u5e38\u7528\u7684\u89e3\u51b3\u5bf9\u7b56\u3002<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\u53ef\u4ee5\u5f88\u660e\u663e\u7684\u53d1\u73b0\u65e0\u8bba\u662f\u4f20\u5bfc\u635f\u5931\u6216\u5207\u6362\u635f\u5931\uff0c\u90fd\u548c\u5207\u6362\u9891\u7387\u6709\u5f88\u5bc6\u5207\u7684\u5173\u7cfb\u3002\u964d\u4f4e\u5207 \u6362\u9891\u7387\u53ef\u4ee5\u6709\u6548\u7684\u964d\u4f4e\u635f\u8017\uff0c\u7279\u522b\u662f\u5728\u8f7b\u8f7d\u65f6\u3002\u4f46\u7531\u6ce2\u5bbd\u8c03\u53d8\u7522\u751f\u5668\u6240\u7522\u751f\u7684\u6ce2\u5bbd\u5fc5\u987b\u88ab\u63a7\u5236\uff0c\u514d\u5f97\u9020\u6210\u78c1\u6027\u5143\u4ef6\u7684\u9971\u548c\u3002\u800c\u4e14\uff0c\u53cd\u9a70\u8f6c\u6362\u5668\u7684\u8f93\u51fa\u80fd\u91cf\u53ef\u4ee5\u8868\u793a\u70ba Po = (Vdc2 \u00d7 Ton2 ) \/(2 \u00d7 Lp \u00d7 T) \u00d7\u03b7\uff0c\u5176\u4e2d\u03b7\u4ee3\u8868\u8f6c\u6362\u6548\u7387\u3002\u5728\u8f7b\u8f7d\u65f6\uff0c\u5bfc\u901a\u65f6\u95f4(Ton)\u5f88\u77ed\u6682\uff0c\u589e\u957f\u5207\u6362\u9031\u671f(T)\uff0c \u6216\u964d\u4f4e\u5207\u6362\u9891\u7387(fs)\uff0c\u662f\u4e00\u4e2a\u5f88\u76f4\u89c9\u7684\u60f3\u6cd5\u3002<\/p>\n

\n\u964d\u4f4e\u5207\u6362\u9891\u7387\u00a0
\n\u964d\u4f4e\u5207\u6362\u9891\u7387\u53ef\u4ee5\u6709\u6548\u7684\u964d\u4f4e\u7535\u6e90\u635f\u5931\u3002\u6700\u8fd1\u6709\u8bb8\u591a\u5b9e\u9645\u964d\u4f4e\u9891\u7387\u7684\u65b9\u6cd5\u88ab\u63d0\u51fa\u6765\u00a0
\n[2-7]\u3002SGS-Thompson[2]\u53ca National Semiconductor[3]\u63d0\u51fa\u8109\u885d\u7701\u7565(pulse skipping)\u7684 \u6280\u672f\uff0c\u6839\u636e\u8d1f\u8f7d\u7684\u8f7b\u91cd\u7a0b\u5ea6\uff0c\u6765\u51b3\u5b9a\u7701\u7565\u5207\u6362\u8109\u885d\u4e0e\u5426\uff0c\u56fe\u4e8c\u8868\u8fbe\u4e86\u8109\u885d\u7701\u7565\u6a21\u5f0f\u7684\u6982\u5ff5\uff0c \u7b49\u6548\u964d\u4f4e\u5207\u6362\u8109\u885d\u6570\u76ee\u6765\u6ee1\u8db3\u5728\u8f7b\u8f7d\u7684\u4f4e\u635f\u8017\u8981\u6c42\u3002\u5982\u56fe\u4e09\u6240\u793a\uff0c\u8109\u885d\u7701\u7565\u6280\u672f\u7684\u4e3b\u8981\u7f3a\u70b9 \u662f\u6709\u53ef\u80fd\u4f1a\u56e0\u70ba\u52a8\u6001\u8d1f\u8f7d\u7684\u6539\u53d8\u9020\u6210\u56de\u6388\u5ef6\u8fdf\u800c\u7522\u751f\u8f93\u51fa\u7535\u538b\u7a81\u964d\u548c\u7a81\u6607\u7684\u60c5\u5f62\u3002 \u5bf9\u4e00\u4e2a\u53cd\u9a70\u7535\u6e90\u8f6c\u6362\u5668\u800c\u8a00\uff0c\u8f93\u51fa\u529f\u7387 Po = fs\u00d7 Lp\u00d7 Ip2 \/2\uff0c\u5176\u4e2d Lp \u662f\u53d8\u538b\u5668\u4e00\u6b21\u4fa7\u7684 \u7535\u611f\uff0c\u800c Ip \u662f\u4e00\u6b21\u4fa7\u7535\u6d41\uff0cIp = (Vin\/ Lp)\u00d7 Ton\uff0c\u8f93\u51fa\u7535\u6e90\u53ef\u4ee5\u8868\u793a\u6210 Po = (fs \u00d7 Vin2 \u00d7 Ton2 ) \/(2 \u00d7 Lp)\uff0c\u5207\u6362\u9031\u671f T (=1\/fs)\u7a81\u7136\u88ab\u500d\u6570\u5ef6\u5c55\u5f00\u6765\u3002\u8f93\u51fa\u529f\u7387\u548c\u7535\u538b\u4e5f\u56e0\u6b64\u7a81\u7136\u4e0b \u964d\uff0c\u5728\u90a3\u4e4b\u540e\uff0c\u5bfc\u901a\u65f6\u95f4 Ton\u4f1a\u56e0\u70ba\u8f93\u51fa\u7535\u538b\u7684\u56de\u6388\u800c\u589e\u52a0\uff0c\u6765\u7a33\u5b9a\u8f93\u51fa\u7535\u538b\uff0c\u5728\u8fd9\u540c\u65f6\uff0c\u4e5f \u9020\u6210\u8f93\u51fa\u7535\u538b\u7a81\u964d\u7684\u60c5\u5f62\u3002\u53e6\u5916\uff0c\u5f53\u7701\u7565\u7684\u8109\u885d\u6062\u590d\u65f6\uff0c\u5bfc\u901a\u65f6\u95f4 Ton\u4e5f\u76f8\u5bf9\u7a81\u7136\u88ab\u5ef6\u5c55\u5f00\u6765\uff0c \u9020\u6210\u8f93\u51fa\u7535\u538b\u7a81\u6607\u7684\u60c5\u5f62\u3002\u53e6\u5916\uff0c\u8109\u885d\u7701\u7565\u6280\u672f\u662f\u6839\u636e\u7279\u5b9a\u8f93\u51fa\u8d1f\u8f7d\u53d8\u52a8\u6765\u51b3\u5b9a\u662f\u5426\u63d2\u5165\u6216 \u7701\u7565\u8109\u885d\uff0c\u5728\u8d1f\u8f7d\u5fae\u5c0f\u53d8\u5316\u9020\u6210\u8f93\u51fa\u7535\u538b\u76f8\u8fd1\u65f6\uff0c\u7535\u6e90\u8282\u7701\u7684\u60c5\u51b5\u5c31\u96be\u4ee5\u5bdf\u89c9\u3002\u00a0<\/p>\n

\"\"<\/p>\n

\u7a81\u885d\u6a21\u5f0f(burst mode)[4]\u7684\u6280\u672f\uff0c\u6216\u79f0\u6253\u55dd\u6a21\u5f0f(hiccup mode)\u6216\u7701\u7565\u9031\u671f \u6a21\u5f0f\u3002\u5982\u56fe\u56db\u6240\u793a\uff0c\u5f53\u8d1f\u8f7d\u7a81\u7136\u95f4\u4e0b\u964d\uff0c\u63a7\u5236\u8ff4\u8def\u8981\u6c42\u7f29\u77ed Ton\uff0c\u5728\u67d0\u4e00\u4e2a\u8d1f\u8f7d\u7a0b\u5ea6\u4e0b\uff0c\u8109\u885d \u6a21\u5f0f\u7684\u63a7\u5236\u7535\u8def\u5f00\u59cb\u9632\u6b62\u5bfc\u901a\u65f6\u95f4 Ton\u51cf\u5c11\uff0c\u7136\u540e\u540c\u65f6\u4e5f\u5f00\u59cb\u9031\u671f\u6027\u7684\u906e\u853d\u6ce2\u5bbd\u8c03\u53d8\u7684\u8109\u885d\u3002 \u7535\u6e90\u53ef\u4ee5\u900f\u8fc7\u964d\u4f4e\u8109\u885d\u7fa4\u5bbd\u5ea6\uff0c\u6216\u589e\u52a0\u906e\u853d\u9031\u671f\u957f\u5ea6\uff0c\u5728\u4e0d\u540c\u7684\u8d1f\u8f7d\u4e0b\uff0c\u8fbe\u5230\u8282\u7701\u80fd\u91cf\u7684\u76ee \u7684\u3002\u6b64\u6280\u672f\u6709\u4e24\u4e2a\u660e\u663e\u7684\u7f3a\u70b9\uff0c\u5c31\u662f\u4f4e\u9891\u5e72\u6270\u4f1a\u548c\u906e\u853d\u9031\u671f\u4e00\u8d77\u8c10\u9707\u51fa\u73b0\uff0c\u800c\u4e14\u8d1f\u8f7d\u7684\u7a81\u7136 \u6539\u53d8\uff0c\u4e5f\u4f1a\u9020\u6210\u8f93\u51fa\u7535\u538b\u7a81\u964d\u7684\u60c5\u5f62\uff0c\u56fe\u4e94\u8868\u793a\u53ef\u80fd\u7684\u8f93\u51fa\u7535\u538b\u7a81\u964d\u3002\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/p>\n

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

\u00a0 \u975e\u5bfc\u901a\u65f6\u95f4\u8c03\u53d8(off time modulation)[5-7]\u3002\u56fe\u516d \u8868\u793a\u4e86\u975e\u5bfc\u901a\u65f6\u95f4\u8c03\u53d8\u7684\u57fa\u672c\u6982\u5ff5\uff0c\u5f53\u8f93\u51fa\u7535\u538b\u6389\u5230\u4e34\u754c\u4f4d\u6e96\u4ee5\u4e0b\u65f6\uff0c\u975e\u5bfc\u901a\u65f6\u95f4(off time) \u968f\u8457\u8d1f\u8f7d\u4e0b\u964d\u800c\u7ebf\u6027\u589e\u52a0\uff0c\u5207\u6362\u9891\u7387\u56e0\u800c\u7ebf\u6027\u4e0b\u964d\uff0c\u56e0\u6b64\u5728\u8f7b\u8f7d\u548c\u65e0\u8f7d\u65f6\u53ef\u4ee5\u964d\u4f4e\u529f\u7387\u635f\u5931\u3002 \u56fe\u4e03\u63d0\u4f9b\u4e00\u4e2a\u5207\u6362\u9891\u7387\u76f8\u5bf9\u65bc\u8f93\u51fa\u529f\u7387\u7684\u56fe\u3002\u975e\u5bfc\u901a\u65f6\u95f4\u8c03\u53d8\u4e4b\u52a8\u6001\u54cd\u5e94\u5e94\u8be5\u6bd4\u8109\u885d\u7701\u7565\u6a21\u5f0f\u6765\u5f97\u597d\uff0c\u56e0\u70ba\u8fd9\u662f\u975e\u5bfc\u901a\u65f6\u95f4\u662f\u4e00\u4e2a\u9031\u671f\u63a5\u4e00\u4e2a\u9031\u671f\u8c03\u6574\u3002\u00a0\u00a0<\/p>\n

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

\u964d\u4f4e\u542f\u52a8\u635f\u5931\u00a0
\n\u4f20\u7edf\u7684\u8d77\u52a8\u7535\u8def\u5982\u56fe\u516b(a)\uff0c\u5176\u4e2d VSTA \u662f\u6ce2\u5bbd\u8c03\u53d8\u63a7\u5236\u5668\u7684\u8d77\u59cb\u4e34\u754c\u7535\u538b\uff0cTD_ON \u5219\u662f\u555f \u52a8\u5ef6\u8fdf(start-up delay)\u65f6\u95f4\uff0cTD_ON = (C1 x VSTA)\/IC1 \u5927\u7684\u8f93\u5165\u7535\u963b(Rin)\u53ef\u4ee5\u6709\u6548\u7684\u964d\u4f4e\u7535\u963b\u6027 \u635f\u5931\uff0c\u4f46\u555f\u52a8\u5ef6\u8fdf\u65f6\u95f4\u5c06\u4f1a\u5ef6\u957f\u3002\u5728\u56fe\u516b(b)\u662f\u6240\u63d0\u7684\u5efa\u8bae\u7535\u8def\uff0c\u70ba\u4e86\u53ef\u4ee5\u964d\u4f4e\u5728\u8f93\u5165\u7535\u963b(Rin) \u6240\u9020\u6210\u7684\u8d77\u59cb\u635f\u5931\u3002\u5176\u4e2d\u5927\u7684\u8f93\u5165\u7535\u963b\u53ef\u4ee5\u548c\u5c0f\u7684\u7535\u5bb9 C1 \u4e00\u8d77\u4f7f\u7528\uff0c\u786e\u4fdd\u555f\u52a8\u5ef6\u8fdf\u65f6\u95f4\u591f \u77ed\uff0c\u800c\u5927\u7535\u5bb9(C2)\u662f\u7528\u6765\u63d0\u4f9b\u7a33\u5b9a\u7535\u538b\u7ed9 VDD\u3002\u4f7f\u7528\u8fd9\u79cd\u8d77\u59cb\u7535\u8def\uff0c\u8d77\u52a8\u635f\u5931\u53ef\u4ee5\u975e\u5e38\u4f4e\uff0c \u555f\u52a8\u5ef6\u8fdf\u65f6\u95f4\u4e5f\u53ef\u4ee5\u975e\u5e38\u77ed\u3002\u00a0<\/p>\n

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

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