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</script> <script type="text/javascript"> var OBJ_TITLE = "高频变压器的基本绕法"; var OBJ_ID = "332"; var MARK = "news"; var ARR_AD_MARK = ["news_detail_1", "news_detail_2", "news_detail_3"]; var SID = "0001,0002,0006"; //权限ID var AUTHORITY_ID = ""; </script> <script src="/JS/Cls_jsPage.js"></script> <!--content:start--> <div class="content"> <div class="plc2"> 当前位置?a href="/">首页</a> » <a href="/news/">资讯中心</a> » <a href="/News/News-0001,0002,0006.shtml"> 晨飞资讯</a> » <a href="/Article/gaopinbianyaqidejibe_1.html">高频变压器的基本绕法</a></div> <div class="list4nr"> <div class="n_info_con" id="printableview"> <h3> 高频变压器的基本绕法</h3> <div class="info_con_tit"> <div class="info_con_tit"> <div class="n_tit"> <span>文章出处?a href=""><a href="http://cfdz.nsw888.com">深圳市晨飞电子有限公?/a></a></span><span>网责任编辑：<a href="http://cfdz.nsw888.com">NSW</a></span><span>作者：<a href="http://cfdz.nsw888.com">NSW</a></span><span>人气?span id="cntrHits">-</span></span><span>发表时间?014-07-10 15:23:00</span> <div class="newchang"> <!-- JiaThis Button BEGIN --> <div id="ckepop"> <a href="http://www.jiathis.com/share/?uid=899792" class="jiathis jiathis_txt jtico jtico_jiathis" target="_blank">分享到：</a> <a class="jiathis_button_qzone">QQ空间</a> <a class="jiathis_button_tsina"> 新浪微博</a> <a class="jiathis_button_tqq">腾讯微博</a> <a class="jiathis_button_tsohu">搜狐微博</a> <a class="jiathis_button_t163">网易微博</a> <a class="jiathis_button_tools_1"></a><a class="jiathis_button_tools_2"></a> </div> <script type="text/javascript"> var jiathis_config = { "data_track_clickback": true };</script> <script type="text/javascript" src="http://v2.jiathis.com/code/jia.js?uid=899792" charset="utf-8"></script> <!-- JiaThis Button END --> </div> </div> </div> </div> <div id="cntrBody"> <p>　　高频变压器三明治绕法可以减少变压器的漏感，而减少漏感带来的好处是电压尖峰会降低，使MOSFET的电压应力降低，还可以改善EMI：由MOSFET与散热片引起的共模干扰电流也可以降低，从而改善EMI;由于在初级中间加入了一个次级绕组，所以减少了变压器初级的层间分布电容，而层间电容的减少，就会使电路中的寄生振荡减少，同样可以降低MOSFET与次级整流管的电压电流应力，改善EMI?br /> <br /> <strong><a href="http://www.chenfeipower.com/">高频变压?/a></strong>的基本绕法分为三明治绕法和顺序绕法两种?br /> <br /> 1.三明治绕法：<br /> <br /> 三明治绕法久负盛名，几乎每个做电源的人都知道这种绕法，但真正对三明治绕法做过深入研究的人，应该不?br /> <br /> 相信很多人都吃过三明治，就是两层面包中间夹一层奶油。顾名思义，三明治绕法就是两层夹一层的绕法。由于被夹在中间的绕组不同，三明治又分为两种绕法：初级夹次级，次级夹初级?br /> <br /> 第一种，初级夹次级的绕法（也叫初级平均绕法）<br /> <br /> 1、可以有效降低铜损引起的温升：由于输出是低压大电流，故铜损对导线的长度较为敏感，绕在内侧的Ns/2可以有效较少绕线长度，从而降低此Ns/2绕组的铜损及发热。外层的Ns/2虽说绕线相对较长，但是基本上是在变压器的外层，散热良好故温度也不会太高?br /> <br /> 2、可以减少初级耦合至变压器磁芯高频干扰。由于初级远离磁芯，次级电压低，故引起的高频干扰小?br /> <br /> 2.普通顺序绕法：<br /> <br /> 一般的单输出电源，变压器分?个绕组，初级绕组Np,次级绕组Ns,辅助电源绕组Nb，绕制的顺序是：Np--Ns--Nb<br /> <br /> 此种绕法工艺简单，易于控制磁芯的各种参数，一致性较好，绕线成本低，适用于大批量的生产，但漏感稍大，而耦合电容小，EMI比较好故适用于对漏感不敏感的小功率场合，一般功率小?0~40W的电源中普遍实用这种绕法?br /> <br /> </p> </div> <div class="apage" id="showfenye"> <!--资讯分页:start--> <script type="text/javascript"> var pagecont=1; 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