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在設計開關(guān)電源變壓器時要把漏感減至最??/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)責任編輯：<a >NSW</a></span><span>作者：<a >NSW</a></span><span>人氣??span
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<p> <span style="font-size: 16px">當代，電子技術(shù)飛速發(fā)展，許多電子產(chǎn)品都在追求減小體積以及改善效率。提高電子電路的工作頻率是滿足此要求的最便捷的方法，由于使用鐵氧體磁芯制作的變壓器可以工作于較高的頻率，且隨著磁性材料工藝的發(fā)展這一趨勢仍在繼續(xù)，因此，設計用在更高頻率工作的鐵氧體磁芯變壓器的使用比例是越來越大??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 而我們在設計</span><strong><a href="http://m.cmqp.com.cn/product/"><span style="font-size: 16px">開關(guān)電源變壓器</span></a></strong><span style="font-size: 16px">的時候必須把漏感減至最小。其實，國內(nèi)變壓器的交流損耗是由高頻電流的趨膚效應以及磁芯的損耗引起的。高頻電流通過導線時總是趨向于從表面流過，這會使導線的有效流通面積減小，并使導線的交流等效阻抗遠高于銅電阻??/span></p>
<p> </p>
<p style="text-align: center"><span style="font-size: 16px"><img width="168" height="168" alt="" src="/UploadFiles/FCK/123123(5).jpg" /></span></p>
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<p><span style="font-size: 16px"> 高頻電流對導體的穿透能力與開關(guān)頻率的平方根成反比，為減小交流銅阻抗，導線半徑不得超過高頻電流可達深度??倍。舉例說明，當f=100kHz時，導線直徑理論上可??phi;0.4mm。但為了減小趨膚效應，實際可用更細的導線多股并繞，而不用一根粗導線繞制??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 把漏感減至最小的原因是因為漏感愈大，產(chǎn)生的尖峰電壓幅度是愈高，漏極鉗位電路的損耗就愈大，這必然導致電源效率降低。對于一個符合絕緣及安全性標準的開關(guān)電源變壓器，其漏感量應為次級開路時初級電感量的1%??%。要想達??%以下的指標，在制造工藝上將會難于實現(xiàn)??/span></p>
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