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在設(shè)計(jì)開關(guān)電源變壓器時(shí)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(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??014-04-22 13:46:00</span>
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<p> <span style="font-size: 16px">當(dāng)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(shì)仍在繼續(xù)，因此，設(shè)計(jì)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?cè)谠O(shè)計(jì)</span><strong><a href="http://linhang.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(shí)候必須把漏感減至最小。其實(shí)，國內(nèi)變壓器的交流損耗是由高頻電流的趨膚效應(yīng)以及磁芯的損耗引起的。高頻電流通過導(dǎo)線時(shí)總是趨向于從表面流過，這會(huì)使導(dǎo)線的有效流通面積減小，并使導(dǎo)線的交流等效阻抗遠(yuǎn)高于銅電阻??/span></p>
<p> </p>
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<p> </p>
<p><span style="font-size: 16px"> 高頻電流對(duì)導(dǎo)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(dǎo)線半徑不得超過高頻電流可達(dá)深度??倍。舉例說明，當(dāng)f=100kHz時(shí)，導(dǎo)線直徑理論上可??phi;0.4mm。但為了減小趨膚效應(yīng)，實(shí)際可用更細(xì)的導(dǎo)線多股并繞，而不用一根粗導(dǎo)線繞制??/span></p>
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<p><span style="font-size: 16px"> 把漏感減至最小的原因是因?yàn)槁└杏?，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(dǎo)致電源效率降低。對(duì)于一個(gè)符合絕緣及安全性標(biāo)準(zhǔn)的開關(guān)電源變壓器，其漏感量應(yīng)為次級(jí)開路時(shí)初級(jí)電感量的1%??%。要想達(dá)??%以下的指標(biāo)，在制造工藝上將會(huì)難于實(shí)現(xiàn)??/span></p>
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