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高頻變壓器為什么要留氣??</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??013-11-05 14:18:00</span>
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<p> 高頻變壓器開氣隙，是為了防止鐵芯磁飽合，因?yàn)閁PS中有高次詣波，但變壓器開氣隙的原理和電感是不一樣的。變壓器都是硅鋼片拼成的。兩個(gè)對(duì)著的硅鋼片之間的間隙叫氣隙。氣隙大了當(dāng)然磁阻就大了。變壓器留氣隙是為了防止在工作中產(chǎn)生磁飽?? 氣隙是在鐵芯交合處留的縫隙和繞線無關(guān)??/p>
<p> 高頻變壓器有了氣隙的確是增加了磁??但卻是有益的!氣隙的作用是減小磁導(dǎo)率，使線圈特性較少地依賴于磁芯材料的起始磁導(dǎo)率。氣隙可以避免在交流大信號(hào)或直流偏置下的磁飽和現(xiàn)象，更好地控制電感量。然而，在氣隙降低磁導(dǎo)率的情況下要求<strong><a href="http://linhang.com.cn/product/product-0001,0015.shtml">高頻變壓??/a></strong>的線圈圈數(shù)較多，相關(guān)的銅損也增加，所以需要適當(dāng)?shù)恼壑??/p>
<p> 高頻變壓器的磁體（就是磁鐵）大部分都是鐵氧體，磁鐵有一種現(xiàn)象叫磁飽和，就是導(dǎo)磁能力達(dá)到最大極限，這時(shí)反而導(dǎo)磁能力降低了，變壓器有氣隙就是不讓磁鐵達(dá)到磁飽和，這樣變壓器就能發(fā)揮最大效率，變壓器沒氣隙就會(huì)達(dá)到磁飽和，效率就會(huì)降低，所以變壓器都有氣隙，氣隙多大效率最高是通過試驗(yàn)來確定，一般經(jīng)??.5MM左右，也就是幾張白紙厚度??br />
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