基于屏蔽-对消法的反激变换器共模传导噪声抑制方法研究  

Shielding-cancellation Method for Suppressing Common Mode Conducted Noise in a Flyback Converter

作　　者：杨唯俊 董纪清[1] YANG Wei-jun;DONG Ji-qing(College of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学电气工程与自动化学院,福建福州350108

出　　处：《电气开关》2024年第2期48-53,58,共7页Electric Switchgear

摘　　要：分析了反激变换器共模(common mode,CM)噪声的特点,并基于屏蔽法与平衡法原理,提出了屏蔽-对消法,在变压器中加入屏蔽-对消绕组层,与原边CM噪声互相抵消的同时,也屏蔽了变压器副边至原边的噪声耦合路径,抑制了变压器内部CM噪声的传导。建立了反激变换器CM噪声传导路径模型,通过实验对比了无屏蔽层、采用全屏蔽铜箔与使用了屏蔽-对消绕组三种变压器结构样机的CM噪声,实验结果验证了屏蔽-对消绕组在反激变换器中抑制CM噪声的有效性。In this paper,the common mode(CM)noise characteristics of a flyback converter is analyzed,based on shielding method and equilibrium method,this paper proposes a shielding cancellation scheme which adds a layer of shielding cancellation winding in the transformer.This winding can not only cancel the common mode noise on the primary side,but also cut off the coupling path of transformer to suppress the conduction of common mode noise in transformer.A CM noise conduction path model of the flyback converter is bulit and the CM noise of three different transformer including without shielding,with fully shielded copper foil and shielding cancellation winding are compared.The experimental results reveal the effectiveness of shielding cancellation winding in suppressing CM noise in the flyback converter.

关 键 词：反激变换器 电磁干扰 共模噪声抵消 屏蔽-对消绕组 

分 类 号：TN624[电子电信—电路与系统]