反激式开关电源共模传导发射模型的分析与应用  

Analysis and Application of Common-mode EMI Model of a Flyback Switch Mode Converter

作　　者：林思聪[1] 陈为[1] 

机构地区：[1]福州大学电气工程及自动化学院,350002

出　　处：《电气应用》2005年第2期119-122,76,共5页Electrotechnical Application

基　　金：福建省自然科学基金(A0210011)资助项目

摘　　要：以反激式开关电源为研究对象,分析了其共模传导噪声的干扰源、传输通道以及变压器分布电容参数对共模噪声的作用,建立相应的共模传导发射分析模型和变压器分布电容模型;重点分析了二次侧干扰源的影响及其作用机理,提出了一种简单但有效降低共模传导噪声的方法,并进行了实验验证。Common-mode ( CM ) noise sources and its conduction paths of a flyback switch mode power supply areanalyzed. The influence of stray capacitances of the transformer on CM noise is also analyzed in details. Based on above analysis, models of C M emission and stray capacitance of transformer are built respectively. More attention is paid on the effect of secondary side noise source and its mechanism. A simple but effective method to reduce CM noise is introduced. The above analysis and models have been verified by experiments.

关 键 词：反激式开关电源 共模传导发射模型 干扰源 电磁干扰 

分 类 号：TN86[电子电信—信息与通信工程]