📄 电磁干扰滤波电容器使用方法.htm
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<body lang=ZH-CN link=blue vlink=blue style='tab-interval:21.0pt;text-justify-trim:
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<div class=Section1 style='layout-grid:15.6pt'>
<p align=center style='text-align:center'><strong>电磁干扰滤波电容器使用方法</strong><span
lang=EN-US><o:p></o:p></span></p>
<p> 电容器是电路中最基本的元件之一，利用电容滤除电路上的高频骚扰和对电源解耦是所有电路设计人员都熟悉的。但是，随着电磁干扰问题的日益突出，特别是干扰频率的日益提高，由于不了解电容的基本特性而达不到预期滤波效果的事情时有发生。本文介绍一些容易被忽略的影响电容滤波性能的参数及使用电容器抑制电磁骚扰时需要注意的事项。<span
lang=EN-US><o:p></o:p></span></p>
<p><strong><span lang=EN-US>1电容引线的作用</span></strong><span lang=EN-US><o:p></o:p></span></p>
<p> 在用电容抑制电磁骚扰时，最容易忽视的问题就是电容引线对滤波效果的影响。电容器的容抗与频率成反比，正是利用这一特性，将电容并联在信号线与地线之间起到对高频噪声的旁路作用。然而，在实际工程中，很多人发现这种方法并不能起到预期滤除噪声的效果，面对顽固的电磁噪声束手无策。出现这种情况的一个原因是忽略了电容引线对旁路效果的影响。<span
lang=EN-US><o:p></o:p></span></p>
<p> 实际电容器的电路模型如图<span lang=EN-US>1所示，它是由等效电感（ESL）、电容和等效电阻（ESR）构成的串联网络。<o:p></o:p></span></p>
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