功率因数校正电路杂散磁场对传导干扰发射作用的分析研究  

ANALYSIS ON THE EMI EFFECT OF STRAY MAGNETIC FIELD FROM MAIN CIRCUIT OF A PFC SWITCHED MODE POWER SUPPLY

作　　者：和军平[1] 陈为 姜建国[1] 

机构地区：[1]清华大学电机工程系,北京市海淀区100084 [2]台达能源技术(上海)有限公司,上海市浦东区201209

出　　处：《中国电机工程学报》2005年第14期151-157,共7页Proceedings of the CSEE

基　　金：福建省自然科学基金项目(A0210011)~~

摘　　要：开关电源主电路产生的强杂散电磁场会影响EMI滤波器的衰减性能。在细致分析功率因数校正(PFC)开关电源电感产生的杂散磁场特性和电源电磁干扰(EMI)滤波器共模电感的磁场敏感性基础上,实验考察了PFC电感和EMI共模滤波器间的磁耦合作用,建立了包含磁场耦合效应的PFC开关电源差模传导干扰高频模型。利用该模型,分析了空间耦合差模干扰成分的比例,阐明了电源差模干扰发射异常的原因;说明了因感应电压造成的火线、中性线传导干扰发射不均衡现象;根据磁耦合机理,提出了几种改善电源的差模干扰发射的措施,并进行了验证。The attenuation characteristic of on board EMI filter may be deteriorated greatly by the stray magnetic field produced by main circuit of switched mode power supply. The magnetic coupling effect between a PFC inductor and an EMI common mode choke is studied by experiments after analyzing the stray magnetic field distribution characteristic of PFC inductor and the sensitivity of common mode choke. A differential mode EMI model of this PFC converter is built up,which includes the magnetic coupling effect. Based on this model, the coupling EMI component is distinguished. The unequal EMI emission phenomena on L and N line is explained too. In the end, several measures are proposed to decrease DM emission and verified by experiments.

关 键 词：电力电子 电磁兼容 功率因数校正 磁耦合 共模电感磁敏感性 传导干扰模型 传导干扰发射不均衡 

分 类 号：TM153[电气工程—电工理论与新技术]