{"id":2448,"date":"2019-05-16T08:31:03","date_gmt":"2019-05-16T08:31:03","guid":{"rendered":""},"modified":"2019-05-16T16:31:33","modified_gmt":"2019-05-16T08:31:33","slug":"%e5%a6%82%e4%bd%95%e4%bd%bfpcb%e7%94%b5%e8%b7%af%e7%ac%a6%e5%90%88emi%e5%92%8cemc%e5%85%bc%e5%ae%b9%e6%80%a7%e7%9a%84%e8%a6%81%e6%b1%82","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=2448","title":{"rendered":"\u5982\u4f55\u4f7fPCB\u7535\u8def\u7b26\u5408EMI\u548cEMC\u517c\u5bb9\u6027\u7684\u8981\u6c42"},"content":{"rendered":"

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\n\t <\/div>\n

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\n\t\"\u5982\u4f55\u4f7fPCB\u7535\u8def\u7b26\u5408EMI\u548cEMC\u517c\u5bb9\u6027\u7684\u8981\u6c42\"<\/p>\n

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\n\t<\/p>\n

\n\t\u56fe5. \u4e0d\u540c\u4e8e\u975e\u5e38\u76f8\u4f3c\u7684\u53cd\u6fc0\u5f0f\u8c03\u8282\u5668\uff0c\u5355\u7aef\u4e3b\u7535\u611f\u8f6c\u6362\u5668\uff08SEPIC\uff09\u5177\u6709\u8fde\u7eed\u7684\u521d\u7ea7\u548c\u6b21\u7ea7\u7535\u6d41\uff0c\u6240\u4ea7\u751f\u7684\u566a\u58f0\u66f4\u4f4e\u3002<\/p>\n

\n\t\u7ebf\u6027\u540e\u7aef\u8c03\u8282<\/p>\n

\n\t\u6709\u4e9b\u5e94\u7528\u8981\u6c42\u8f93\u51fa\u566a\u58f0\u975e\u5e38\u5c0f\uff0c\u800c\u53c8\u65e0\u6cd5\u63a5\u53d7\u7ebf\u6027\u8c03\u8282\u5668\u7684\u4f4e\u6548\u7387\u3002\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u91c7\u7528\u5f00\u5173\u8c03\u8282\u5668\u540e\u63a5\u7ebf\u6027\u8c03\u8282\u5668\u7684\u7ed3\u6784\u53ef\u80fd\u4f1a\u6bd4\u8f83\u9002\u5408\u3002\u540e\u7aef\u8c03\u8282\u5668\u53ef\u4ee5\u524a\u5f31\u5f00\u5173\u8c03\u8282\u5668\u4ea7\u751f\u7684\u9ad8\u9891\u566a\u58f0\uff0c\u6700\u7ec8\u7684\u566a\u58f0\u6027\u80fd\u53ef\u4ee5\u63a5\u8fd1\u4e8e\u4e00\u4e2a\u5355\u72ec\u7684\u7ebf\u6027\u8c03\u8282\u5668\u3002\u7531\u4e8e\u5927\u90e8\u5206\u7535\u538b\u8f6c\u6362\u7531\u5f00\u5173\u8c03\u8282\u5668\u5b8c\u6210\uff0c\u56e0\u800c\u6548\u7387\u7684\u635f\u5931\u8981\u6bd4\u5b8c\u5168\u91c7\u7528\u7ebf\u6027\u8c03\u8282\u5668\u65f6\u5c0f\u5f97\u591a\u3002<\/p>\n

\n\t\u8fd9\u79cd\u65b9\u6848\u4e5f\u53ef\u4ee5\u7528\u4e8e\u5728\u8f93\u5165\u8f93\u51fa\u7535\u538b\u8303\u56f4\u6709\u91cd\u53e0\u7684\u5e94\u7528\u4e2d\uff0c\u66ff\u6362\u53cd\u6fc0\u5f0f\u548cSEPIC\u8f6c\u6362\u5668\u3002\u5f53\u8f93\u5165\u7535\u538b\u4f4e\u4e8e\u8f93\u51fa\u65f6\u5347\u538b\u8f6c\u6362\u5668\u5de5\u4f5c\uff0c\u800c\u5f53\u8f93\u5165\u9ad8\u4e8e\u8f93\u51fa\u65f6\u7ebf\u6027\u8c03\u8282\u5668\u53d1\u6325\u4f5c\u7528\u3002\u5347\u538b\u8f6c\u6362\u5668\u548c\u4f4e\u538b\u5dee\uff08LDO\uff09\u7ebf\u6027\u8c03\u8282\u5668\u53ef\u4ee5\u88ab\u7ec4\u5408\u5230\u5355\u7247IC\u4e2d\uff08\u56fe6\uff09\u3002\u8fd9\u79cd\u5668\u4ef6\u5177\u6709\u4e00\u79cd\u8ddf\u8e2a\u6a21\u5f0f\uff0c\u4f7f\u5347\u538b\u8f6c\u6362\u5668\u7684\u8f93\u51fa\u7535\u538b\u603b\u662f\u9ad8\u51faLDO\u8f93\u51fa\u7535\u538b300mV\u3002\u8fd9\u6837\uff0cLDO\u8c03\u8282\u5668\u80fd\u591f\u4fdd\u8bc1\u5177\u6709\u8db3\u591f\u7684PSRR\u548c\u7535\u538b\u88d5\u91cf\uff08\u8f93\u5165\u51cf\u8f93\u51fa\uff09\uff0c\u53ef\u4ee5\u5728\u5404\u79cd\u60c5\u51b5\u4e0b\u6291\u5236\u5347\u538b\u8f6c\u6362\u5668\u7684\u8f93\u51fa\u566a\u58f0\u3002<\/p>\n

\n\t<\/p>\n

\n\t\u56fe6. \u4f5c\u4e3a\u7b2c\u4e09\u79cd\u9009\u62e9\u65b9\u6848\uff0c\u6b64IC\u7ed3\u5408\u4e86\u4e00\u4e2a\u5f00\u5173\u578b\u8c03\u8282\u5668\uff08\u7528\u4e8e\u5347\u538b\uff09\u548c\u4e00\u4e2a\u7ebf\u6027\u8c03\u8282\u5668\uff08\u7528\u4e8e\u964d\u538b\uff09\uff0c\u5f53\u8f93\u5165\u7535\u538b\u8303\u56f4\u8de8\u8d8a\u8f93\u51fa\u7535\u538b\u65f6\u53ef\u4ee5\u4fdd\u6301\u7a33\u5b9a\u7684\u8f93\u51fa\u3002<\/p>\n

\n\t\u6309\u7167\u5b9a\u4e49\uff0c\u5171\u6a21\u4f20\u5bfc\u566a\u58f0\u5728\u8f93\u5165\u6216\u8f93\u51fa\u7aef\u7684\u4e24\u6761\u8fde\u63a5\u7ebf\u4e0a\u76f8\u4f4d\u76f8\u540c\u3002\u4e00\u822c\u6765\u8bb2\uff0c\u5b83\u4ec5\u5bf9\u90a3\u4e9b\u548c\u5927\u5730\u6709\u8fde\u63a5\u901a\u8def\u7684\u56fa\u5b9a\u7cfb\u7edf\u9020\u6210\u5f71\u54cd\u3002\u5728\u4e00\u4e2a\u5e26\u6709\u5171\u6a21\u6ee4\u6ce2\u5668\u7684\u5178\u578b\u79bb\u7ebf\u5f0f\u7535\u6e90\u4e2d\uff08\u56fe7\uff09\uff0c\u5171\u6a21\u566a\u58f0\u7684\u4e3b\u8981\u6765\u6e90\u662fMOSFET\u3002MOSFET\u901a\u5e38\u662f\u7535\u8def\u4e2d\u7684\u4e3b\u8981\u8017\u80fd\u5143\u4ef6\uff0c\u5f88\u591a\u60c5\u51b5\u4e0b\u5b83\u9700\u8981\u914d\u6563\u70ed\u5668\u3002<\/p>\n

\n\t<\/p>\n

\n\t\u56fe7. \u5728\u8fd9\u4e2a\u5178\u578b\u7684\u79bb\u7ebf\u5f0f\u7535\u6e90\u4e2d\uff0c\u5171\u6a21\u6ee4\u6ce2\u5668\u53ef\u964d\u4f4e\u8f93\u5165\u548c\u8f93\u51fa\u4e24\u4fa7\u7684\u566a\u58f0\u3002<\/p>\n

\n\tTO-220\u5668\u4ef6\u7684\u6563\u70ed\u7247\u8fde\u63a5\u4e8eMOSFET\u6f0f\u6781\uff0c\u800c\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u6563\u70ed\u5668\u4f1a\u5411\u5927\u5730\u4f20\u5bfc\u7535\u6d41\u3002\u7531\u4e8eMOSFET\u4e0e\u6563\u70ed\u5668\u7535\u6c14\u9694\u79bb\uff0c\u5b83\u548c\u5927\u5730\u4e4b\u95f4\u5177\u6709\u4e00\u5b9a\u7684\u5206\u5e03\u7535\u5bb9\u3002\u968f\u7740\u5f00\u5173\u7684\u6253\u5f00\u548c\u5173\u65ad\uff0c\u8fc5\u901f\u53d8\u5316\u7684\u6f0f\u6781\u7535\u538b\u4f1a\u901a\u8fc7\u5206\u5e03\u7535\u5bb9\uff08CP1\uff09\u5411\u5927\u5730\u53d1\u9001\u7535\u6d41\u3002\u7531\u4e8e\u4ea4\u6d41\u7535\u7ebf\u548c\u5927\u5730\u4e4b\u95f4\u7684\u4f4e\u963b\u6297\uff0c\u8fd9\u79cd\u5171\u6a21\u7535\u6d41\u4f1a\u901a\u8fc7\u4ea4\u6d41\u8f93\u5165\u6d41\u5165\u5927\u5730\u3002\u53d8\u538b\u5668\u4e5f\u4f1a\u901a\u8fc7\u5206\u5e03\u4e8e\u9694\u79bb\u7684\u521d\u3001\u6b21\u7ea7\u7ed5\u7ec4\u95f4\u7684\u7535\u5bb9\uff08CP2A\u548cCP2B\uff09\u4f20\u5bfc\u9ad8\u9891\u7535\u6d41\u3002\u8fd9\u6837\uff0c\u566a\u58f0\u4f1a\u540c\u65f6\u4f20\u5411\u8f93\u51fa\u7aef\u548c\u8f93\u5165\u7aef\u3002<\/p>\n

\n\t\u56fe7\u4e2d\uff0c\u5171\u6a21\u4f20\u5bfc\u566a\u58f0\u88ab\u5b89\u7f6e\u5728\u566a\u58f0\u6e90\uff08\u7535\u6e90\uff09\u548c\u8f93\u5165\u6216\u8f93\u51fa\u4e4b\u95f4\u7684\u5171\u6a21\u6ee4\u6ce2\u5668\u6291\u5236\u3002\u5171\u6a21\u627c\u6d41\u5708\uff08CML1\u548cCML2\uff09\u901a\u5e38\u662f\u5728\u5355\u4e00\u78c1\u82af\u4e0a\u6309\u56fe\u4e2d\u6240\u793a\u6781\u6027\u7ed5\u5236\u800c\u6210\u3002\u8d1f\u8f7d\u7535\u6d41\u548c\u9a71\u52a8\u7535\u6e90\u7684\u5165\u7ebf\u7535\u6d41\u90fd\u662f\u5dee\u6a21\u7535\u6d41\uff08\u7535\u6d41\u7531\u4e00\u6761\u7ebf\u6d41\u5165\u53e6\u4e00\u6761\u7ebf\u6d41\u51fa\uff09\u3002\u5728\u8fd9\u79cd\u7531\u5355\u4e00\u78c1\u82af\u7ed5\u5236\u7684\u5171\u6a21\u627c\u6d41\u5708\u4e2d\uff0c\u5dee\u6a21\u7535\u6d41\u4ea7\u751f\u7684\u78c1\u573a\u4e92\u76f8\u62b5\u6d88\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f7f\u7528\u8f83\u5c0f\u7684\u78c1\u82af\uff0c\u56e0\u4e3a\u5176\u4e2d\u7684\u50a8\u80fd\u5f88\u5c0f\u3002<\/p>\n

\n\t\u8bb8\u591a\u4e3a\u79bb\u7ebf\u5f0f\u7535\u6e90\u8bbe\u8ba1\u7684\u5171\u6a21\u627c\u6d41\u5708\u91c7\u7528\u7a7a\u95f4\u4e0a\u5206\u79bb\u7684\u7ebf\u5708\u7ed5\u6210\u3002\u8fd9\u79cd\u7ed3\u6784\u589e\u52a0\u4e86\u4e00\u5b9a\u7684\u5dee\u6a21\u7535\u611f\uff0c\u8fd9\u6709\u52a9\u4e8e\u964d\u4f4e\u4f20\u5bfc\u578b\u5dee\u6a21\u566a\u58f0\u3002\u7531\u4e8e\u78c1\u82af\u540c\u65f6\u7a7f\u8fc7\u4e24\u7ec4\u7ebf\u5708\uff0c\u6240\u4ee5\u7531\u5dee\u6a21\u7535\u6d41\u548c\u7535\u611f\u4ea7\u751f\u7684\u78c1\u573a\u4e3b\u8981\u5b58\u5728\u4e8e\u7a7a\u6c14\u4e2d\u800c\u975e\u78c1\u82af\u4e2d\uff0c\u8fd9\u4f1a\u5bfc\u81f4\u7535\u78c1\u8f90\u5c04\u3002<\/p>\n

\n\t\u4ea7\u751f\u4e8e\u7535\u6e90\u6240\u5e26\u8d1f\u8f7d\u7684\u5171\u6a21\u566a\u58f0\u4f1a\u7ecf\u7531\u53d8\u538b\u5668\u4e2d\u7684\u5206\u5e03\u7535\u5bb9\uff08CP2A\u548cCP2B\uff09\uff0c\u7a7f\u8fc7\u7535\u6e90\u5411\u4ea4\u6d41\u7535\u7f51\u4f20\u64ad\u3002\u5728\u53d8\u538b\u5668\u4e2d\u589e\u52a0\u6cd5\u62c9\u7b2c\u5c4f\u853d\uff08\u521d\u3001\u6b21\u7ea7\u4e4b\u95f4\u7684\u63a5\u5730\u5c42\uff09\u53ef\u4ee5\u964d\u4f4e\u8fd9\u79cd\u566a\u58f0\uff08\u56fe8\uff09\u3002\u5c4f\u853d\u5c42\u7684\u5f15\u5165\u5728\u521d\u7ea7\u548c\u6b21\u7ea7\u7ebf\u5708\u4e0e\u5730\u4e4b\u95f4\u5206\u522b\u5f62\u6210\u4e86\u5206\u5e03\u7535\u5bb9\uff0c\u8fd9\u4e9b\u7535\u5bb9\u5c06\u5171\u6a21\u7535\u6d41\u65c1\u8def\u5230\u5730\uff0c\u800c\u4e0d\u518d\u7a7f\u8fc7\u53d8\u538b\u5668\u3002<\/p>\n

\n\t<\/p>\n

\n\t\u56fe8. \u521d\u7ea7\u548c\u6b21\u7ea7\u4e4b\u95f4\u7684\u6cd5\u62c9\u7b2c\u5c4f\u853d\u53ef\u4ee5\u963b\u65ad\u901a\u8fc7\u53d8\u538b\u5668\u7ed5\u7ec4\u95f4\u5206\u5e03\u7535\u5bb9\u7684\u5171\u6a21\u566a\u58f0<\/p>\n

\n\t\u6b63\u5982\u4f20\u5bfc\u566a\u58f0\u603b\u662f\u4ee5\u7535\u538b\u6216\u7535\u6d41\u7684\u5f62\u5f0f\u51fa\u73b0\uff0c\u8f90\u5c04\u566a\u58f0\u5219\u662f\u8868\u73b0\u4e3a\u7535\u573a\u6216\u78c1\u573a\u7684\u5f62\u5f0f\u3002\u7136\u800c\uff0c\u7531\u4e8e\u7535\u78c1\u573a\u5b58\u5728\u4e8e\u7a7a\u95f4\u800c\u975e\u5bfc\u4f53\u4e2d\uff0c\u56e0\u6b64\u4e5f\u5c31\u6ca1\u6709\u5dee\u5206\u6216\u5171\u6a21\u4e4b\u522b\u3002\u7535\u573a\u5b58\u5728\u4e8e\u4e24\u4e2a\u7535\u4f4d\u4e4b\u95f4\u7684\u7a7a\u95f4\u4e2d\uff0c\u78c1\u573a\u56f4\u7ed5\u901a\u8fc7\u7a7a\u95f4\u7684\u7535\u6d41\u800c\u5b58\u5728\u3002\u4e24\u79cd\u573a\u53ef\u5b58\u5728\u4e8e\u4e00\u4e2a\u7535\u8def\u4e2d\uff0c\u56e0\u4e3a\u7535\u5bb9\u5c31\u662f\u4ee5\u7535\u573a\u7684\u5f62\u5f0f\u50a8\u80fd\u800c\u7535\u611f\/\u53d8\u538b\u5668\u5219\u4ee5\u78c1\u573a\u7684\u5f62\u5f0f\u50a8\u5b58\/\u8026\u5408\u80fd\u91cf\u3002<\/p>\n

\n\t\u7535\u573a<\/p>\n

\n\t\u7531\u4e8e\u7535\u573a\u5b58\u5728\u4e8e\u4e24\u4e2a\u5177\u6709\u4e0d\u540c\u7535\u4f4d\u7684\u8868\u9762\u6216\u5b9e\u4f53\u4e4b\u95f4\uff0c\u56e0\u6b64\uff0c\u53ea\u9700\u8981\u7528\u4e00\u4e2a\u63a5\u5730\u7684\u9632\u62a4\u7f69\u5c06\u8bbe\u5907\u5c4f\u853d\u8d77\u6765\uff0c\u5c31\u53ef\u4ee5\u76f8\u5bf9\u5bb9\u6613\u5730\u5c06\u8bbe\u5907\u5185\u90e8\u4ea7\u751f\u7684\u7535\u573a\u566a\u58f0\u9650\u5236\u5728\u5c4f\u853d\u7f69\u5185\u90e8\u3002\u8fd9\u79cd\u5c4f\u853d\u63aa\u65bd\u5df2\u88ab\u5e7f\u6cdb\u7528\u4e8e\u76d1\u89c6\u5668\u3001\u793a\u6ce2\u5668<\/u>\u3001\u5f00\u5173\u7535\u6e90<\/u>\u4ee5\u53ca\u5176\u5b83\u5177\u6709\u5927\u5e45\u5ea6\u7535\u538b\u6446\u52a8\u7684\u8bbe\u5907\u3002\u53e6\u5916\u4e00\u79cd\u901a\u884c\u7684\u505a\u6cd5\u662f\u5728\u7535\u8def\u677f\u4e0a\u8bbe\u7f6e\u63a5\u5730\u5c42\u3002\u7535\u573a\u5f3a\u5ea6\u6b63\u6bd4\u4e8e\u8868\u9762\u4e4b\u95f4\u7684\u7535\u4f4d\u5dee\uff0c\u5e76\u53cd\u6bd4\u4e8e\u5b83\u4eec\u4e4b\u95f4\u7684\u8ddd\u79bb\u3002\u4e3e\u4f8b\u6765\u8bb2\uff0c\u7535\u573a\u53ef\u5b58\u5728\u4e8e\u6e90\u548c\u9644\u8fd1\u7684\u63a5\u5730\u5c42\u4e4b\u95f4\u3002\u8fd9\u6837\uff0c\u5229\u7528\u591a\u5c42\u7ebf\u8def\u677f\uff0c\u5728\u7535\u8def\u6216\u7ebf\u6761\u4e0e\u9ad8\u7535\u4f4d\u4e4b\u95f4\u8bbe\u7f6e\u4e00\u4e2a\u63a5\u5730\u5c42\uff0c\u5c31\u53ef\u4ee5\u5bf9\u7535\u573a\u8d77\u5230\u5c4f\u853d\u4f5c\u7528\u3002<\/p>\n

\n\t\u4e0d\u8fc7\u5728\u91c7\u7528\u63a5\u5730\u5c42\u65f6\u8fd8\u5e94\u6ce8\u610f\u5230\u9ad8\u538b\u7ebf\u8def\u4e2d\u7684\u5bb9\u6027\u8d1f\u8f7d\u3002\u7535\u5bb9\u50a8\u80fd\u4e8e\u7535\u573a\u4e2d\uff0c\u8fd9\u6837\uff0c\u5f53\u9760\u8fd1\u4e00\u4e2a\u7535\u5bb9\u8bbe\u7f6e\u63a5\u5730\u5c42\u65f6\u5c31\u5728\u5bfc\u4f53\u548c\u5730\u4e4b\u95f4\u5f62\u6210\u4e00\u4e2a\u7535\u5bb9\u3002\u5bfc\u4f53\u4e0a\u7684\u5927dV\/dt\u4fe1\u53f7\u4f1a\u4ea7\u751f\u5927\u4f20\u5bfc\u7535\u6d41\u5230\u5730\uff0c\u8fd9\u6837\uff0c\u5728\u63a7\u5236\u8f90\u5c04\u566a\u58f0\u7684\u540c\u65f6\u5374\u964d\u4f4e\u4e86\u4f20\u5bfc\u566a\u58f0\u6027\u80fd\u3002<\/p>\n

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