开关电源有源共模EMI滤波器研究及其应用

Research and Application of an Active Common-mode EMI Filter for Switch-mode Power Supply

由于开关电源的高功率密度、高开关工作频率和紧凑结构,因此对其电磁兼容提出了更高的要求。分析了传统无源电磁干扰(Electromagnetic Interference,简称EMI)滤波器的缺点,提出有源共模滤波器的设计思想,并分析了其工作原理。以一台反激式开关电源为研究对象,具体设计出其有源共模滤波器。最后通过电路仿真和实验,验证了该方案的有效性和可行性。

High power density, high operation frequency and compact size requirements of switch-mode power supply （SMPS） introduce great challenge for its electromagnetic compatibility solution.This paper reviews the limits of passive EMI filtes firstly,then proposes a new active common-mode filter（ACMF） for SMPS,and also designs an ACMF for flyback converter as an example.The simulation and experiment verified the proposed ACMF.