开关电源传导EMI分析及抑制方法研究  

Research on Power Conducted EMI Analysis and Suppression Methods

作　　者：陈宝祥 祝志博 黄俊硕 王永安 Chen Baoxiang;Zhu Zhibo;Huang Junshuo;Wang Yongan(Jiangsu Medical Device Inspection Institute,Nanjing 210012,China;Jiangsu Engineering Laboratory of Electrical Equipment Electromagnetic Compatibility,Nanjing Normal University,Nanjing 210023,China)

机构地区：[1]江苏省医疗器械检验所,江苏南京210012 [2]南京师范大学江苏省电气装备电磁兼容工程实验室,江苏南京210023

出　　处：《南京师范大学学报（工程技术版）》2019年第4期70-74,共5页Journal of Nanjing Normal University(Engineering and Technology Edition)

摘　　要：以开关电源中的CRM Boost PFC变换器为研究对象,研究了CRM下整流桥产生的电压变化率,阐述了交流电正负半周的差模、共模传导噪声的产生机理,分析了由于驱动电压过冲导致的传导电磁干扰问题,通过建立等效电路,提出了在整流桥电路加差模电容的电磁干扰抑制方法,该方法可有效降低传导电磁骚扰,为工程提供了实用的技术方案.In this paper,the CRM(Critical Conduction Mode)Boost PFC converter in power supply is taken as the research object,the voltage change rates of rectifier bridge under CRM are studied,the generation mechanism of differential mode and common mode conducted noise in positive and negative half cycle of AC is expounded,and the conducted electromagnetic interference caused by driving voltage overshoot is analyzed. By establishing equivalent circuit,a method of EMI suppression with capacitor in rectifier bridge circuit is proposed. This method can effectively reduce the conducted EMI and provide a practical technical scheme for engineering application.

关 键 词：开关电源 CRM Boost PFC变换器 传导电磁干扰 传导噪声抑制 

分 类 号：TM933[电气工程—电力电子与电力传动]