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高頻變壓器的基本繞法</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)表時間??014-07-10 15:23:00</span>
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<p> 高頻變壓器三明治繞法可以減少變壓器的漏感，而減少漏感帶來的好處是電壓尖峰會降低，使MOSFET的電壓應(yīng)力降低，還可以改善EMI：由MOSFET與散熱片引起的共模干擾電流也可以降低，從而改善EMI;由于在初級中間加入了一個次級繞組，所以減少了變壓器初級的層間分布電容，而層間電容的減少，就會使電路中的寄生振蕩減少，同樣可以降低MOSFET與次級整流管的電壓電流應(yīng)力，改善EMI??br />
<br />
<strong><a href="http://linhang.com.cn/">高頻變壓??/a></strong>的基本繞法分為三明治繞法和順序繞法兩種??br />
<br />
1.三明治繞法：<br />
<br />
三明治繞法久負(fù)盛名，幾乎每個做電源的人都知道這種繞法，但真正對三明治繞法做過深入研究的人，應(yīng)該不??br />
<br />
相信很多人都吃過三明治，就是兩層面包中間夾一層奶油。顧名思義，三明治繞法就是兩層夾一層的繞法。由于被夾在中間的繞組不同，三明治又分為兩種繞法：初級夾次級，次級夾初級??br />
<br />
第一種，初級夾次級的繞法（也叫初級平均繞法）<br />
<br />
1、可以有效降低銅損引起的溫升：由于輸出是低壓大電流，故銅損對導(dǎo)線的長度較為敏感，繞在內(nèi)側(cè)的Ns/2可以有效較少繞線長度，從而降低此Ns/2繞組的銅損及發(fā)熱。外層的Ns/2雖說繞線相對較長，但是基本上是在變壓器的外層，散熱良好故溫度也不會太高??br />
<br />
2、可以減少初級耦合至變壓器磁芯高頻干擾。由于初級遠(yuǎn)離磁芯，次級電壓低，故引起的高頻干擾小??br />
<br />
2.普通順序繞法：<br />
<br />
一般的單輸出電源，變壓器分??個繞組，初級繞組Np,次級繞組Ns,輔助電源繞組Nb，繞制的順序是：Np--Ns--Nb<br />
<br />
此種繞法工藝簡單，易于控制磁芯的各種參數(shù)，一致性較好，繞線成本低，適用于大批量的生產(chǎn)，但漏感稍大，而耦合電容小，EMI比較好故適用于對漏感不敏感的小功率場合，一般功率小??0~40W的電源中普遍實(shí)用這種繞法??br />
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