电源纹波抑制器的原理与设计

Principle and Design of Ripple Attenuator for AC-DC and DC-DC Converters

如何降低AC-DC和DC-DC变换器输出电压中的纹波和噪声,是所有设计和使用该类电源者较为关注的问题之一。介绍了一种综合运用有源滤波和无源滤波设计电源纹波抑制器的原理和方法。详细叙述了有源低通滤波的设计原理、计算方法和采用计算机仿真优化软件设计无源低通滤波器的元件参数的思路与方法。设计制作出的电源纹波抑制器具有体积小、重量轻等特点,可以从较低的频率开始对电源中的纹波和噪声进行有效的抑制,从而使得电源变换器输出电压中的纹波满足许多要求较高的应用场合。

How to reduce the ripple and switching noise in the output of AC-DC and DC-DC converter is one of the problems about which all the designers and users of AC-DC and DC-DC converter care. The principle and the method of designing ripple attenuator are introduced by combining both active and passive filtering. The principle and calculation method of designing active low pass filter （LPF）, and determination in parameters of the components in passive LPF by using simulation software were described in detail in this paper. Ripple attenuator featuring small volume and light weight was designed and prepared, which can attenuate the output ripple and switching noise effectively from very low frequency, and as a result, can be used in those applications with high requirements for ripple and switching noise of output voltage.