{"id":3036,"date":"2020-04-02T09:41:56","date_gmt":"2020-04-02T09:41:56","guid":{"rendered":""},"modified":"2020-04-02T17:42:31","modified_gmt":"2020-04-02T09:42:31","slug":"%e7%94%b5%e5%ae%b9%e6%bb%a4%e6%b3%a2%e5%9c%a8pcb%e7%94%b5%e8%b7%afemc%e8%ae%be%e8%ae%a1%e4%b8%ad%e7%9a%84%e4%bd%9c%e7%94%a8%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=3036","title":{"rendered":"\u7535\u5bb9\u6ee4\u6ce2\u5728PCB\u7535\u8defEMC\u8bbe\u8ba1\u4e2d\u7684\u4f5c\u7528\u662f\u4ec0\u4e48"},"content":{"rendered":"

\n\t\u4e00\u3001\u7535\u5bb9<\/u>\u7684\u6ee4\u6ce2\u4f5c\u7528<\/p>\n

\n\t\"\u7535\u5bb9\u6ee4\u6ce2\u5728PCB\u7535\u8defEMC\u8bbe\u8ba1\u4e2d\u7684\u4f5c\u7528\u662f\u4ec0\u4e48\"<\/p>\n

\n\t <\/div>\n

\n\t\u25cf \u5373\u9891\u7387f\u8d8a\u5927\uff0c\u7535\u5bb9\u7684\u963b\u6297<\/u>Z\u8d8a\u5c0f\u3002<\/p>\n

\n\t\u25cf \u5f53\u4f4e\u9891\u65f6\uff0c\u7535\u5bb9C\u7531\u4e8e\u963b\u6297Z\u6bd4\u8f83\u5927\uff0c\u6709\u7528\u4fe1\u53f7\u53ef\u4ee5\u987a\u5229\u901a\u8fc7\uff1b<\/p>\n

\n\t\u25cf \u5f53\u9ad8\u9891\u65f6\uff0c\u7535\u5bb9C\u7531\u4e8e\u963b\u6297Z\u5df2\u7ecf\u5f88\u5c0f\u4e86\uff0c\u76f8\u5f53\u4e8e\u628a\u9ad8\u9891\u566a\u58f0\u77ed\u8def<\/u>\u5230GND\u4e0a\u53bb\u4e86\u3002<\/p>\n

\n\t\u4e8c\u3001\u7535\u5bb9\u6ee4\u6ce2<\/u>\u5728\u4f55\u65f6\u4f1a\u5931\u6548<\/p>\n

\n\t\u6574\u6539\u4e2d\u5e38\u5e38\u4f1a\u4f7f\u7528\u7535\u5bb9\u8fd9\u79cd\u5143\u5668\u4ef6<\/u>\u8fdb\u884c\u6ee4\u6ce2\uff0c\u5f80\u5f80\u6709“\u5927\u7535\u5bb9\u6ee4\u4f4e\u9891\uff0c\u5c0f\u7535\u5bb9\u6ee4\u9ad8\u9891”\u7684\u8bf4\u6cd5\u3002<\/p>\n

\n\t\u4ee5\u5e38\u89c1\u7684\u8868\u8d34\u5f0fMLCC<\/u>\u9676\u74f7\u7535\u5bb9\u4e3a\u4f8b\uff0c\u8fdb\u884c\u7b49\u6548\u6a21\u578b\u5982\u4e0b\uff1a<\/p>\n

\n\t\"\u7535\u5bb9\u6ee4\u6ce2\u5728PCB\u7535\u8defEMC\u8bbe\u8ba1\u4e2d\u7684\u4f5c\u7528\u662f\u4ec0\u4e48\"<\/p>\n

\n\t\u5bb9\u503c10nF\uff0c\u5c01\u88c50603\u7684X7R\u9676\u74f7\u7684\u6a21\u578b\u53c2\u6570\u5982\u4e0b\uff1a<\/p>\n

\n\t<\/p>\n

\n\t\u7531\u4e8e\u7b49\u6548\u6a21\u578b\u4e2d\u65e2\u6709\u7535\u5bb9C\uff0c\u4e5f\u6709\u7535\u611f<\/u>L\uff0c\u7ec4\u6210\u4e86\u4e8c\u9636\u7cfb\u7edf\uff0c\u5c31\u5b58\u5728\u4e0d\u7a33\u5b9a\u6027\u3002\u5bf9\u7535\u8def<\/u>\u56de\u8def\u6765\u8bf4\uff0c\u5c31\u662f\u4f1a\u53d1\u751f\u8c10\u632f\uff0c\u8c10\u632f\u70b9\u5728\u5982\u4e0b\u9891\u7387\u5904\uff1a<\/p>\n

\n\t<\/p>\n

\n\t\u4e0b\u56fe\u662f\u8c10\u632f\u66f2\u7ebf\u7684\u793a\u4f8b\uff1a<\/p>\n

\n\t<\/p>\n

\n\t\u5373\u5e38\u8bf4\u7684\u5728\u8c10\u632f\u70b9\u524d\u662f\u7535\u5bb9\uff0c\u8c10\u632f\u70b9\u4e4b\u540e\u5c31\u4e0d\u518d\u662f\u7535\u5bb9\u4e86\u3002<\/p>\n

\n\t\u4e09\u3001LC\u6ee4\u6ce2\u4f55\u65f6\u4f7f\u7528<\/p>\n

\n\t\u5982\u679c\u4e32\u8054\u7535\u611fL\uff0c\u518d\u5e76\u8054\u7ec4\u6210C\uff0c\u5c31\u5f62\u6210\u4e86LC\u6ee4\u6ce2\uff1a<\/p>\n

\n\t<\/p>\n

\n\t\u5355\u72ec\u4e00\u4e2a\u7535\u5bb9C\u662f\u4e00\u9636\u7cfb\u7edf\uff0c\u5355\u72ec\u4e00\u4e2a\u7535\u611fL\u4e5f\u662f\u4e00\u9636\u7cfb\u7edf\uff0c\u5728\u5e45\u503c\u8870\u51cf\u659c\u7387\u662f-20dB\u3002\u4f46LC\u7ec4\u6210\u7684\u4e8c\u9636\u7cfb\u7edf\uff0c\u5e45\u503c\u8870\u51cf\u659c\u7387\u662f-40dB\uff0c\u66f4\u9760\u8fd1\u7406\u60f3\u7684“\u7acb\u9661”\u7684\u622a\u6b62\u9891\u7387\u7684\u6548\u679c\uff0c\u5373\u6ee4\u6ce2\u6548\u679c\u66f4\u597d\u3002<\/p>\n

\n\t<\/p>\n

\n\t\u56db\u3001PWM\u9891\u7387\u5230\u5e95\u662f\u591a\u5c11<\/p>\n

\n\t\u5f80\u5f80\u63d0\u5230PWM\uff0c\u6bd4\u5982\u4f1a\u8bf4\u752820kHz PWM\u9a71\u52a8\u7535\u673a\u7b49\u3002\u4f46\u5b9e\u9645\u4e0a\uff0c\u8fd9\u4e2a20kHz\u4ec5\u4ee3\u8868PWM\u7684\u8109\u51b2\u5468\u671f\u662f50us\uff1a<\/p>\n

\n\t<\/p>\n

\n\t\u90a3\u4e48\u6240\u8c13\u768420kHz PWM\u5728\u9891\u57df\u4e0a\u7684\u9891\u7387\u70b9\u843d\u5728\u54ea\u91cc\u5462\uff0c\u5982\u4e0b\u516c\u5f0f\uff1a<\/p>\n

\n\t<\/p>\n

\n\t\u5bf9\u4e8e\u9636\u8dc3\u4fe1\u53f7\u6765\u8bf4\uff0c\u7531\u4e8e\u4e0a\u5347\u65f6\u95f4tr\u65e0\u7a77\u5c0f\uff0c\u5219\u9891\u7387f\u65e0\u7a77\u5927\u3002\u5f53\u9891\u7387\u9ad8\u4e86\u4e4b\u540e\uff0c\u5bc4\u751f\u53c2\u6570\u5219\u4e0d\u80fd\u5728\u5ffd\u7565\uff0c\u4f1a\u5f15\u53d1\u5f88\u591a\u8c10\u632f\u7684\u95ee\u9898\u3002<\/p>\n

\n\t\u4ece\u4fe1\u53f7\u4e0a\u6765\u770b\uff0c\u5c31\u662f\u5f88\u9661\u5ced\u7684\u9636\u8dc3\u4fe1\u53f7\u4f1a\u6709\u8fc7\u51b2\u548c\u632f\u8361\u7684\u95ee\u9898\u3002\u7b80\u5355\u6765\u8bf4\u5c31\u662f\u9891\u7387f\u8d8a\u5927\uff0c\u5219\u566a\u58f0\u6240\u5360\u7684\u9891\u7387\u5c31\u4f1a\u8d8a\u5bbd\u6cdb\uff0c\u5373EMC<\/u>\u7279\u6027\u5c31\u4f1a\u8d8a\u5dee\u3002<\/p>\n

\n\t\u4e94\u3001\u5982\u4f55\u5c06\u539f\u7406\u56fe\u548cPCB<\/u>\u5bf9\u5e94\u8d77\u6765<\/p>\n

\n\t\u7531\u4e8e\u7ec6\u5206\u5de5\u79cd\u7684\u95ee\u9898\uff0c\u539f\u7406\u56fe\u548cPCB\u88ab\u5272\u88c2\u5f00\u6765\uff0c\u7531\u4e24\u7ec4\u4eba\u8fdb\u884c\u5206\u5de5\u4f5c\u4e1a\uff1a<\/p>\n

\n\t<\/p>\n

\n\t\u4f8b\u5982\u5728\u539f\u7406\u56fe\u4e0a\u6709\u5982\u4e0b\u7684\u7535\u8def\uff1a<\/p>\n

\n\t<\/p>\n

\n\t\u5176\u9690\u542b\u4e00\u4e2a\u95ee\u9898\u5c31\u662f\u5728PCB\u4e0a\u5176\u5b9eV1\u7684\u8d1f\u6781\u548cC1\u7684\u8d1f\u6781\u662f\u6709\u4e00\u6761\u7ebf\uff08PCB layout\u5de5\u5177\u8f6f\u4ef6\u4e2d\u7528\u7684\u8bcd\u6bd4\u8f83\u51c6\u786e\uff0cTrace\uff0c\u8e2a\u8ff9\/\u8f68\u8ff9\uff09\u3002<\/p>\n

\n\t\u5f80\u5f80\u5728\u8bbe\u8ba1\u9636\u6bb5A-\u300bB-\u300bC\u662f\u90fd\u4f1a\u5173\u6ce8\u7684\u3002\u5982\u679cEMC\u51fa\u73b0\u95ee\u9898\uff0c\u9664\u4e86\u8981\u5728\u539f\u7406\u56fe\u4e0a\u67e5\u627e\u7535\u8def\u53c2\u6570\u7684\u95ee\u9898\uff0c\u8fd8\u9700\u8981\u7279\u522b\u5173\u6ce8C-\u300bD\uff0c\u5373\u56de\u6d41\u8def\u5f84\u3002<\/p>\n

\n\t<\/p>\n

\n\t\u5982\u679c\u56de\u6d41\u8def\u5f84\u4e0d\u987a\u7545\uff0c\u4f1a\u9020\u6210\u4fe1\u53f7\u7684\u7578\u53d8\uff1a<\/p>\n

\n\t<\/p>\n

\n\t\u6bd4\u5982\u5728EMC\u8bd5\u9a8c\u65f6\uff0cMCU<\/u>\u7684ADC<\/u>\u91c7\u96c6\u5230\u7684\u4fe1\u53f7\u88ab\u5e72\u6270\u5230\u4e86\uff0c\u5219\u9664\u4e86\u5728\u539f\u7406\u56fe\u4e0a\u5206\u6790\u5916\uff0c\u5728PCB\u4e0a\u8bb2\u8be5\u4fe1\u53f7\u9ad8\u4eae\u51fa\u6765\uff0c\u7136\u540e\u518d\u8010\u5fc3\u5bfb\u627e\u8be5\u4fe1\u53f7\u7684\u56de\u6d41\u8def\u5f84\u662f\u5426\u6709\u4e0d\u987a\u7545\u7684\u5730\u65b9\uff1a<\/p>\n

\n\t<\/p>\n

\n\t\u5bf9\u7740\u4fe1\u53f7\u7ebf<\/u>\u5934\u8111\u4e2d\u60f3\u8c61\u56de\u6d41\u8def\u5f84\uff0c\u6709\u70b9\u610f\u8bc6\u6d41\u7684\u611f\u89c9\u3002<\/p>\n

\n\t\u516d\u3001\u603b\u7ed3<\/p>\n

\n\t<\/p>\n","protected":false},"excerpt":{"rendered":"

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