Buck变换器共模电流分析研究  

An Analysis of Common Mode Current of Buck Converter

作　　者：唐剑飞[1] Tang Jianfei(Naval Representatives Office in Ship Development and Design Center,Wuhan 430064,China)

机构地区：[1]中国舰船研究设计中心军事代表室,武汉430064

出　　处：《船电技术》2020年第1期8-11,共4页Marine Electric & Electronic Engineering

摘　　要：为了满足电磁兼容标准,需要在Buck变换器中加入共模滤波器。在某些场合,输出侧的电磁干扰也是需要测试的,因此也需要在Buck变换器输出端接入共模滤波器。论文分析了Buck变换器产生共模电流的机理,得到了共模电流的传导路径,对比了在输入端接共模滤波器和输入输出都接共模滤波的情况下的共模电流干扰,发现后者的共模电流干扰异常。仿真结果也表明输入输出都接共模滤波情况下共模电流非常大,应尽可能采用带隔离型的Buck变换器。In order to mitigate the electromagnetic compatibility(EMC)standards,the common mode(CM)filter is a necessary part in the Buck converter.In some applications,the EMI level of the output terminal is also required to test,leading to the CM filter insertion at the output terminal.The generation mechanism of CM current is analyzed in this paper,and the propagation paths of CM current is presented.CM currents with only the CM filter at the input side is compared to those with CM filters at both input and output sides.The simulation results show that the magnitude of the CM current is very large with CM filters at both sides.For applications,the isolated Buck converter is needed to join so as to reduce the CM current.

关 键 词：BUCK 变换器 共模滤波器 共模电流 

分 类 号：TM46[电气工程—电器]