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高頻變壓器的EMI是怎么產(chǎn)生??</h3>
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<span>文章出處??a href=""><a >深圳市晨飛電子有限公??/a></a></span><span>網(wǎng)責(zé)任編輯：<a >NSW</a></span><span>作者：<a >NSW</a></span><span>人氣??span
id="cntrHits">-</span></span><span>發(fā)表時(shí)間??013-11-26 16:01:00</span>
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<p> 當(dāng)電源中的開(kāi)關(guān)管開(kāi)通后，高頻變壓器一次側(cè)電流逐漸增加，磁芯儲(chǔ)能也隨之增加。當(dāng)開(kāi)關(guān)管關(guān)斷后，二次側(cè)整流二極管導(dǎo)通，<strong><a href="http://linhang.com.cn/product/product-0001,0015.shtml">高頻變壓??/a></strong>儲(chǔ)能被耦合到二次側(cè)，給負(fù)載供電。在開(kāi)關(guān)電源中，輸入整流后的電流為尖脈沖電流，開(kāi)關(guān)開(kāi)通和關(guān)斷時(shí)變換器中電壓、電流變化率很高，這些波形中含有豐富的高頻諧波??/p>
<p> 另外，在主開(kāi)關(guān)管開(kāi)關(guān)過(guò)程和整流二極管反向恢復(fù)過(guò)程中，電路的寄生電感、電容會(huì)發(fā)生高頻振蕩，以上這些都是電磁干擾的來(lái)源。開(kāi)關(guān)電源中存在大量的分布電容，這些分布電容給電磁干擾的傳遞提供了通路，如??所示。圖2中，LISN為線性阻抗穩(wěn)定網(wǎng)絡(luò)，用于線路傳導(dǎo)干擾的測(cè)量。干擾信號(hào)通過(guò)導(dǎo)線、寄生電容等傳遞到變換器的輸入、輸出端，形成了傳導(dǎo)干擾,同時(shí)高頻變變壓器的各繞組之間也存在著大量的寄生電容??/p>
<p> 反激式開(kāi)關(guān)電源中，變壓器工作于連續(xù)模式時(shí)，開(kāi)關(guān)管VT導(dǎo)通后，B點(diǎn)電位低于A點(diǎn)，一次繞組匝間電容便會(huì)充電，充電電流由A流向B;VT關(guān)斷后，寄生電容反向充電，充電電流由B流向A。這樣，變壓器中便產(chǎn)生了差模傳導(dǎo)EMI。同時(shí)，電源元器件與大地之間的電位差也會(huì)產(chǎn)生高頻變化。由于元器件與大地、機(jī)殼之間存在著分布電容，便產(chǎn)生了在輸入端與大地、機(jī)殼所構(gòu)成回路之間流動(dòng)的共模傳導(dǎo)EMI電流??/p>
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