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高頻變壓器直流損耗的產(chǎn)生和解決措??/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: 14px"> <a href="http://www.linhang.com.cn">高頻變壓??/a>在設計的時候要特別注意損耗的問題,一般損耗可分為直流和交流兩??其中直流損耗通常都是由于線圈的銅損耗造成的。高頻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><span style="font-size: 14px"> 高頻電流對導體的穿透能力與開關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。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。在設計的時候必須把漏感減至最小。因為漏感愈大，產(chǎn)生的尖峰電壓幅度愈高，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高頻變壓器，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，在制造工藝上將難于實現(xiàn)。減小漏感時可采取以下措施：</span></p>
<p> </p>
<p style="text-align: center"><span style="font-size: 14px"><img alt="高頻變壓器展?? width="168" height="168" src="/UploadFiles/FCK/高頻變壓??9).jpg" /></span></p>
<p> </p>
<p> </p>
<p><span style="font-size: 14px"> 1.減小初級繞組的匝數(shù)NP;</span></p>
<p> </p>
<p><span style="font-size: 14px"> 2.增加繞組的高、寬??</span></p>
<p> </p>
<p><span style="font-size: 14px"> 3.減小各繞組之間的絕緣??</span></p>
<p> </p>
<p><span style="font-size: 14px"> 4.增加繞組之間的耦合程度;</span></p>
<p> </p>
<p><span style="font-size: 14px"> 5.增大繞組的寬??例如選EE型磁芯，以增加骨架寬度b)??/span></p>
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關于??span><a target='_blank' href="/Search/news.aspx?kwd=%e9%ab%98%e9%a2%91%e5%8f%98%e5%8e%8b%e5%99%a8">高頻變壓??/a> </span>”的相關資訊</h4>
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