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开关电源纹波产生的原因分析</h3>
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<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
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<p><a href="http://www.chenfeipower.com"><strong>开关电?/strong></a>设计时经常会出现噪声，也就是输出波纹，那么开关电源产生波纹的原因是什么呢？由于波纹的存在会对开关电源的正常工作产生影响，因此我们必须抑制波纹的产生，但是我们只有对产生波纹的原因进行了解分析了，我们才可能找到解决的办法，本文就是为大家先介绍开关电源波纹产生的原因进行了分析。具体的情况请看下面具体的分析?/p>
<p> </p>
<p style="text-align: center;"><img src="http://www.chenfeipower.com/UploadFiles/Product/20120703160354_67923.jpg" alt="开关电源变压器" title="ER40高频变压器立? /></p>
<p style="text-align: center;"> </p>
<p>随着SWITCH的开关，电感L中的电流也是在输出电流的有效值上下波动的。所以在输出端也会出现一个与SWITCH同频率的纹波，一般所说的纹波就是指这个。它与输出电容的容量和ESR有关系。这个纹波的频率与开关电源相同，为几十到几百KHz?/p>
<p> </p>
<p>另外，SWITCH双极晶体管或MOSFET的一般选择，不管是哪一种，在其带领的截止时间，会有一个上升时间和下降时间。此时在电路中会出现与开关上升时间相同或频率为奇 数的频率的噪音，通常为几十兆赫。在反向恢复的瞬间，等效电路的电阻电容和电感串联，将导致共振，噪声频率也为几十兆赫。这2种噪声通常被称为高频噪声， 而振幅通常远大于纹波?/p>
<p> </p>
<p>如果是AC／DC变换器，除了上述两种纹波(噪声)以外，还有AC噪声，频率是输入AC电源的频率，?0?0Hz左右。还有一种共模噪声，是由于很多开关电源的功率器件使用外壳作为散热器，产生的等效电容导致的?/p>
<p> </p>
<p>开关电源的波纹有什么要求呢？主要是看产品的设计以及对负载的需? 现在做一个好点的电源，输出纹波电压控制在以下200mV，小?0mV 如果一个小信号模拟和数字控制电路，特别是模拟电路，电源纹波要求非常干净，对其他应用程序，如发光二极管驱动电源，纹波是一点点也没有太大的影响</p>
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mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">以上就是小编为大家总结的关于开关电源波纹产生的原因的分析，以供大家参考?span style="color:gray">如果还有什么问题或者了解更多关于高频变压器的知识，需要学习资料的朋友，本网站每周会更新一，两篇相关的文章在这个专题，为了方便大家查看，可</span></span>收藏本网站。如果你还想了解本站更多的相关文章，可以点击<a href="http://www.chenfeipower.com/news/"><strong>高频变压器知?/strong></a>解答?/p>
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