{"id":1803,"date":"2018-12-17T06:18:09","date_gmt":"2018-12-17T06:18:09","guid":{"rendered":""},"modified":"2018-12-17T14:18:27","modified_gmt":"2018-12-17T06:18:27","slug":"dc-dc+%e5%bc%80%e5%85%b3%e7%94%b5%e6%ba%90+emi+%e5%88%86%e6%9e%90%e4%b8%8e%e4%bc%98%e5%8c%96%e8%ae%be%e8%ae%a1","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=1803","title":{"rendered":"DC-DC \u5f00\u5173\u7535\u6e90 EMI \u5206\u6790\u4e0e\u4f18\u5316\u8bbe\u8ba1"},"content":{"rendered":"

\u73b0\u4ee3\u7535\u529b\u7535\u5b50\u7cfb\u7edf\u901a\u5e38\u5728\u5f00\u5173\u6a21\u5f0f\u4e0b\u5de5\u4f5c\uff0c\u4ea7\u751f\u4e86\u8f83\u5927\u7684\u7535\u78c1\u5e72\u6270\uff08EMI\uff09\uff0cEMI\u95ee\u9898\u4e00\u76f4\u662f\u7535\u529b\u7535\u5b50\u5de5\u7a0b\u5e08\u5934\u75bc\u7684\u95ee\u9898\uff0c\u89e3\u51b3EMI\u95ee\u9898\u662f\u4e00\u9879\u65e2\u56f0\u96be\u53c8\u8017\u65f6\u7684\u5de5\u4f5c\uff0c\u672c\u6587\u5c06\u4ecb\u7ecdEMI\u662f\u5982\u4f55\u4ea7\u751f\u3001\u4f20\u64ad\u4ee5\u53ca\u5982\u4f55\u4f18\u5316\u89e3\u51b3\u3002

\n

\n\u5e38\u89c1\u7f29\u7565\u8bed\uff1a<\/span><\/span>

\n•<\/span><\/span> EMC\uff08Electromagnetic Compatibility\uff09\uff1a\u7535\u78c1\u517c\u5bb9\u6027<\/span><\/span>

\n•<\/span><\/span> EMI\uff08Electromagnetic Interference\uff09\uff1a\u7535\u78c1\u5e72\u6270<\/span><\/span>

\n•<\/span><\/span> EMS\uff08Electromagnetic Susceptibility\uff09\uff1a\u7535\u78c1\u6297\u6270\u5ea6<\/span><\/span>

\n•<\/span><\/span> IEC\uff08International Electrotechnical Commission\uff09\uff1a\u56fd\u9645\u7535\u5de5\u59d4\u5458\u4f1a<\/span><\/span>

\n• <\/span><\/span>FCC\uff08Federal Communication Commission\uff09\uff1a\u7f8e\u56fd\u8054\u90a6\u901a\u4fe1\u59d4\u5458\u4f1a<\/span><\/span>

\n•<\/span><\/span> CISPR\uff1a\u56fd\u9645\u65e0\u7ebf\u7535\u5e72\u6270\u7279\u522b\u59d4\u5458\u4f1a<\/span><\/span>

\n•<\/span><\/span> CE\uff1a\u5b57\u6bcd“CE”\u662f\u6cd5\u6587\u53e5\u5b50\u7684\u7f29\u5199\uff0c\u610f\u6307\u6b27\u76df<\/span><\/span>

\n•<\/span><\/span> CCC\uff08China Compulsory Certificate\uff09\uff1a\u4e2d\u56fd\u5f3a\u5236\u6027\u4ea7\u54c1\u8ba4\u8bc1\u5236\u5ea6\uff0c\u53c8\u79f03C\u8ba4\u8bc1\u3002

\n

\n\u7535\u78c1\u517c\u5bb9\u6027\uff08EMC\uff09\u662f\u6307\u8bbe\u5907\u6216\u7cfb\u7edf\u5728\u7535\u78c1\u73af\u5883\u4e2d\u7b26\u5408\u8981\u6c42\u8fd0\u884c\u5e76\u4e0d\u5bf9\u5176\u73af\u5883\u4e2d\u7684\u4efb\u4f55\u8bbe\u5907\u4ea7\u751f\u65e0\u6cd5\u5fcd\u53d7\u7684\u7535\u78c1\u5e72\u6270\u80fd\u529b\uff0c\u7535\u78c1\u517c\u5bb9\uff08EMC\uff09\u5305\u542b\u7535\u78c1\u5e72\u6270\uff08EMI\uff09\u548c\u7535\u78c1\u6297\u6270\u5ea6\uff08EMS\uff09\u3002\u5176\u5305\u542b\u7684\u6d4b\u8bd5\u9879\u76ee\u5982\u56fe1\u6240\u793a\u3002<\/span><\/span>

\n
<\/p>\n

\n\t<\/div>\n
\n\t \u56fe1  EMC\u6d4b\u8bd5\u9879<\/span><\/span><\/div>\n



\n\u7535\u78c1\u5e72\u6270\u9650\u5236\u53ef\u5206\u4e3a\u4e24\u4e2a\u57fa\u672c\u5e94\u7528\u8303\u7574\uff1a<\/span><\/span>

\n• <\/span><\/span>A\u7c7b\uff1a\u9002\u7528\u4e8e\u5546\u4e1a\u6216\u5de5\u4e1a\u88c5\u7f6e\u73af\u5883\uff0c\u76f8\u5e94\u9650\u5236\u8f83\u4e3a\u8f7b\u677e\u3002<\/span><\/span>

\n•<\/span><\/span> B\u7c7b\uff1a\u9002\u7528\u4e8e\u5bb6\u7528\u6216\u4f4f\u5b85\u88c5\u7f6e\uff0c\u76f8\u5e94\u9650\u5236\u8f83\u4e3a\u4e25\u683c\u3002

\n

\nB\u7c7b\u9650\u5236\u7ea6\u6bd4A\u7c7b\u9650\u5236\u4f4e10dB\uff0c\u5373\u53d1\u5c04\u632f\u5e45\u4e4b\u6bd4\u7ea6\u4e3a1:3(20×log(3)≈10dB)\u3002\u5e02\u573a\u9500\u552e\u7684\u4ea7\u54c1\u8fd8\u9700\u8981\u6ee1\u8db3\u4e00\u4e9b\u91cd\u8981\u7684\u5b89\u89c4\u6807\u51c6\u3002\u5728\u8bb8\u591a\u56fd\u5bb6\uff0c\u7535\u78c1\u517c\u5bb9\u6807\u51c6\u548c\u5b89\u89c4\u6807\u51c6\u7edf\u4e00\u7528\u4e00\u4e2a\u533a\u57df\u8ba4\u8bc1\u6807\u5fd7\u6765\u8868\u793a\uff0c\u5982CE\u6807\u5fd7\u5373\u6b27\u6d32\u8ba4\u8bc1\u6807\u5fd7\uff0cCCC\u6807\u5fd7\u5373\u4e2d\u56fd\u5f3a\u5236\u8ba4\u8bc1\u6807\u5fd7\u3002\u8be5\u6807\u5fd7\u8868\u793a\u4ea7\u54c1\u7b26\u5408\u7535\u78c1\u517c\u5bb9\u6807\u51c6\u548c\u5b89\u89c4\u6807\u51c6\u3002

\n

\n\u5386\u53f2\u4e0a\u666e\u904d\u63a5\u53d7\u7684\u56fd\u9645\u7535\u78c1\u5e72\u6270\u6807\u51c6\u662fCISPR-22\uff0c\u7f8e\u56fd\u7684\u7535\u78c1\u5e72\u6270\u6807\u51c6\u662fFCC\uff0cCISPR-22\u4e0eFCC\u6709\u6240\u4e0d\u540c\uff0c\u4f46\u4e00\u822c\u6765\u8bf4\u5982\u679c\u7535\u6e90\u7b26\u5408CISPR-22\u6807\u51c6\uff0c\u90a3\u4e48\u5b83\u4e5f\u7b26\u5408FCC\u6807\u51c6\u3002\u603b\u4e4bCISPR-22\u6807\u51c6\u5df2\u7ecf\u6210\u4e3a\u5168\u4e16\u754c\u90fd\u9075\u5b88\u7684\u57fa\u672c\u6807\u51c6\u3002\u6c7d\u8f66\u4e0a\u7684\u7535\u78c1\u5e72\u6270\u6807\u51c6\u662fCISPR-25\uff0c\u76f8\u5bf9CISPR22\u6765\u8bf4CISPR-25\u6807\u51c6\u9650\u5236\u503c\u66f4\u4f4e\u5e76\u4e14\u989d\u5916\u5bf9FM\u9891\u6bb5\u505a\u4e86\u5f88\u4e25\u7684\u9650\u5236\u8981\u6c42\u3002\u5177\u4f53\u4f20\u5bfc\u6d4b\u8bd5\u9650\u5236\u8981\u6c42\u5982\u56fe2\u6240\u793a\u3002<\/span><\/span>

\n
<\/p>\n

\n\t<\/div>\n
\n\t \u56fe2  \u4f20\u5bfc\u6d4b\u8bd5\u6807\u51c6<\/span><\/span><\/div>\n



\n\u5982\u56fe3\u6240\u793a\u7535\u78c1\u5e72\u6270\u7684\u8f90\u5c04\u6d4b\u8bd5\u666e\u904d\u91c7\u7528\u5929\u7ebf\u63a5\u6536\u6cd5\u6d4b\u8bd5\uff0c\u76f8\u6bd4\u4e8eCISPR22\u6765\u8bf4CISPR25\u989d\u5916\u589e\u52a0\u4e86150KHz ~ 30MHz\u7684\u8f90\u5c04\u6d4b\u8bd5\uff0c\u8fd9\u90e8\u5206\u6d4b\u8bd5\u9891\u6bb5\u8986\u76d6\u4e86DCDC\u7684\u5de5\u4f5c\u9891\u7387\u8303\u56f4\uff0c\u662f\u8f90\u5c04\u6d4b\u8bd5\u7684\u96be\u70b9\u3002\u53e6\u5916CISPR-25\u8f90\u5c04\u6d4b\u8bd5\u91c7\u75281M\u6cd5\u5929\u7ebf\u8ddd\u79bb\u66f4\u8fd1\uff0c\u6d4b\u8bd5\u63a5\u6536\u7684\u4fe1\u53f7\u66f4\u5f3a\u3002<\/span><\/span>

\n
<\/p>\n

\n\t<\/div>\n
\n\t\u56fe3  \u8f90\u5c04\u6d4b\u8bd5\u6807\u51c6<\/span><\/span><\/div>\n



\n\u5bf9\u4e8e\u8bbe\u5907\u6765\u8bf4DCDC\u5f00\u5173\u7535\u6e90\u662f\u6700\u5e38\u89c1\u7684\u566a\u58f0\u6e90\uff0c\u800c\u901a\u5e38\u53c8\u4e0d\u6613\u53d7\u5e72\u6270\uff0c\u6240\u4ee5DCDC\u7684EMC\u95ee\u9898\u4e3b\u8981\u5c31\u662fEMI\u95ee\u9898\u3002\u4ee5Buck\u7535\u6e90\u4e3a\u4f8b\uff0cDCDC\u82af\u7247\u5f00\u5173\u8fc7\u7a0b\u4e2d\u4ea7\u751f\u7535\u538b\u548c\u7535\u6d41\u7684\u53d8\u5316\uff0c\u5305\u542b\u4e86\u8f83\u5feb\u7684di\/dt\u548cdv\/dt\u566a\u58f0\u5206\u91cf\uff0c\u5176\u5f00\u5173\u566a\u58f0\u4e0d\u4ec5\u5305\u542b\u5f00\u5173\u6b21\u548c\u500d\u9891\u9891\u7387\u6bb5\u7684\u566a\u58f0\uff0c\u53e6\u5916\u5176\u5f00\u5173\u901f\u5ea6\u8d8a\u4f4e\uff0c\u9ad8\u9891\u566a\u58f0\u5206\u91cf\u8870\u51cf\u8d8a\u5927\u3002\u566a\u58f0\u5206\u4e3a\u5dee\u6a21\u566a\u58f0\u548c\u5171\u6a21\u566a\u58f0\uff0c\u5dee\u6a21\u566a\u58f0\u662fLN\u7ebf\u4e4b\u95f4\u7684\u7535\u4f4d\u5dee\uff0c\u5171\u6a21\u566a\u58f0\u662f\u5f85\u6d4b\u96f6\u90e8\u4ef6\u7684LN\u7ebf\u548c\u53c2\u8003\u5730\u4e4b\u95f4\u7684\u7535\u4f4d\u5dee\u3002DCDC\u7535\u6e90EMI\u4e3b\u8981\u6765\u6e90\u4e8e\u7535\u6d41\u548c\u7535\u538b\u8df3\u53d8\uff0c\u901a\u8fc7\u5171\u6a21\u548c\u5dee\u6a21\u7684\u5f62\u5f0f\u8026\u5408\u5230\u63a5\u6536\u5668\u4e0a\u3002

\n

\n\u5982\u56fe4\u6240\u793a\u662fBuck\u5f00\u5173\u7535\u6e90\u7684\u566a\u58f0\u4ea7\u751f\u548c\u8026\u5408\u8def\u5f84\uff0c\u4ece\u4f20\u5bfc\u8def\u5f84\u6765\u8bf4\u5f00\u5173\u8282\u70b9\u4ea7\u751f\u7684\u5dee\u6a21\u5e72\u6270\u901a\u8fc7\u8f93\u5165\u7535\u5bb9\u6ee4\u6ce2\u540e\u4f1a\u76f4\u63a5\u4f20\u5230\u8f93\u5165\u7aef\uff0c\u5171\u6a21\u5e72\u6270\u901a\u8fc7\u5f00\u5173\u8282\u70b9\u5bf9\u5730\u7684\u8026\u5408\u518d\u901a\u8fc7LISN\u7aef\u68c0\u6d4b\u5230\u3002\u4ece\u8f90\u5c04\u7684\u8def\u5f84\u6765\u770b\u4e3b\u8981\u662f\u5dee\u6a21\u7684\u529f\u7387\u7535\u6d41\u56de\u8def\u4ea7\u751f\u7684\uff0c\u5f53\u7136\u5171\u6a21\u5e72\u6270\u4e5f\u4f1a\u4ea7\u751f\u90e8\u5206\u8f90\u5c04\u5e72\u6270\u3002\u56e0\u6b64\u5728\u8bbe\u8ba1\u7535\u8def\u65f6\u51cf\u5c0f\u529f\u7387\u5f00\u5173\u7535\u6d41\u56de\u8def\u5bf9\u4f20\u5bfc\u8f90\u5c04\u5e72\u6270\u6709\u5f88\u5927\u7684\u5e2e\u52a9\u3002<\/span><\/span>

\n
<\/p>\n

\n\t<\/div>\n
\n\t\u56fe4  DCDC\u566a\u58f0\u6e90\u53ca\u8026\u5408\u8def\u5f84<\/span><\/span><\/div>\n



\n\u65e2\u7136\u6709\u4e86\u4e0a\u9762\u5bf9EMI\u4ea7\u751f\u7684\u539f\u56e0\u5206\u6790\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u6309\u7167\u5982\u4e0b\u51e0\u70b9\u5bf9EMI\u8fdb\u884c\u4f18\u5316\uff1a<\/span><\/span>

\n•<\/span><\/span> \u8f93\u5165\u7aef\u589e\u52a0EMI\u6ee4\u6ce2\u5668

\nEMI\u6ee4\u6ce2\u5668\u53ef\u4ee5\u6291\u5236\u6d41\u7ecfLISN\u7684\u5dee\u6a21\u548c\u5171\u6a21\u7535\u6d41\uff0c\u8fd9\u5728\u4f20\u5bfc\u6d4b\u8bd5\u4e2d\u5c24\u5176\u5173\u952e\uff0c\u6839\u636e\u5bf9\u566a\u58f0\u7684\u5927\u5c0f\u7684\u8870\u51cf\u6bd4\u4f8b\u53ef\u4ee5\u8ba1\u7b97\u51faEMI\u6ee4\u6ce2\u5668\u7684\u53c2\u6570\u5927\u5c0f\u3002\u5e38\u89c1\u7684EMI\u6ee4\u6ce2\u5668\u53c2\u6570\u5982\u56fe5\u6240\u793a\u3002<\/span><\/span>

\n
<\/p>\n

\n\t<\/div>\n
\n\t \u56fe5  \u5e38\u89c1EMI\u6ee4\u6ce2\u5668\u8bbe\u8ba1\u53c2\u6570<\/span><\/span><\/div>\n



\n•<\/span><\/span> \u8f93\u5165\u8f93\u51fa\u7535\u5bb9\u4f4d\u7f6e\u8981\u9760\u8fd1\u82af\u7247\u653e\u7f6e

\n\u5728\u529f\u7387\u5f00\u5173\u56de\u8def\u4e2ddi\/dt\u73af\u8def\u4f1a\u4ea7\u751f\u78c1\u573a\uff0c\u5e76\u4e14\u78c1\u573a\u5f3a\u5ea6\u4e0e\u7535\u6d41\u548c\u73af\u8def\u9762\u79ef\u6210\u6b63\u6bd4\u5173\u7cfb\u3002\u51cf\u5c0f\u73af\u8def\u9762\u79ef\u80fd\u5927\u5e45\u5ea6\u51cf\u5c0f\u5bf9\u5916\u8f90\u5c04\u3002\u5982\u56fe6\u6240\u793a\u901a\u8fc7\u5c06\u8f93\u5165\u7535\u5bb9C2\u9760\u8fd1\u82af\u7247\u53ef\u4ee5\u663e\u8457\u51cf\u5c0f\u78c1\u573a\u8f90\u5c04\u7a0b\u5ea6\u3002<\/span><\/span>

\n
<\/p>\n

\n\t<\/div>\n
\n\t \u56fe6  \u8f93\u5165\u7535\u5bb9\u4f4d\u7f6e\u5bf9EMI\u7684\u5f71\u54cd<\/span><\/span><\/div>\n



\n•<\/span><\/span> LC\u6ee4\u6ce2\u5668\u8981\u4e0e\u8fdc\u79bbDCDC\u9ad8\u9891\u7535\u6d41\u73af\u8def

\n\u6240\u6709\u7684LC\u6ee4\u6ce2\u5668\u90fd\u662f\u4ee5\u7535\u611f\u7ed3\u675f\uff0c\u5e76\u4e14\u8981\u8fdc\u79bbDCDC\u7684\u9ad8\u9891\u73af\u8def\u3002\u9632\u6b62\u7535\u6d41\u73af\u8def\u7684\u8fd1\u573a\u78c1\u573a\u6548\u5e94\u5bf9\u8f93\u5165\u6ee4\u6ce2\u5668\u7684\u5f71\u54cd\u3002<\/span><\/span>

\n

\n• <\/span><\/span>\u5bf9\u79f0\u8bbe\u8ba1\u82af\u7247\u548c\u5bf9\u79f0\u7535\u5bb9\u8bbe\u8ba1

\n\u5982\u56fe7\u6240\u793a\uff0c\u5bf9\u79f0\u7535\u5bb9\u8bbe\u8ba1\u80fd\u660e\u663e\u62b5\u6d88\u78c1\u573a\uff0c\u5982\u679c\u7535\u5bb9\u96c6\u6210\u5230\u82af\u7247\u5185\u90e8\u7684\u8bdd\u5bf9\u4f20\u5bfc\u548c\u8f90\u5c04\u7684\u9ad8\u9891\u5e72\u6270\u90fd\u80fd\u8d77\u5230\u6781\u5927\u7684\u6291\u5236\u4f5c\u7528\uff0cMPS\u7684MPQ4491M\u5c31\u662f\u4e00\u6b3e\u9ad8\u5ea6\u96c6\u6210\u7684\u8f66\u8f7d\u5145\u7535\u82af\u7247\u65b9\u6848\uff0c\u5185\u90e8\u96c6\u6210\u4e86\u7535\u5bb9\uff0c\u5177\u6709\u826f\u597d\u7684EMI\u6027\u80fd\u3002<\/span><\/span>

\n
<\/p>\n

\n\t<\/div>\n
\n\t\u56fe7  \u5bf9\u79f0\u7535\u5bb9\u8bbe\u8ba1<\/span><\/span><\/div>\n



\n•<\/span><\/span> \u6539\u7528\u4e00\u4f53\u6210\u578b\u7535\u611f

\n\u73af\u5f62\u7535\u611f\u7684\u6f0f\u78c1\u8f83\u5927\uff0c\u4f53\u79ef\u4e5f\u6bd4\u8f83\u5927\uff0c\u5bf9\u5927\u5730\u4e5f\u6709\u6bd4\u8f83\u5927\u7684\u8026\u5408\u7535\u5bb9\uff0c\u56e0\u6b64\u5176\u5bf9\u5916\u7684\u8f90\u5c04\u66f4\u5927\uff0c\u5982\u56fe8\u6240\u793a\u5c06\u73af\u5f62\u7535\u611f\u66ff\u6362\u4e3a\u8d34\u7247\u7535\u611f\u540e\u6574\u4f53\u7684EMI\u5c31\u4f1a\u4e0b\u964d\u5f88\u591a\u3002<\/span><\/span>

\n
<\/p>\n

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