电源学报2025，Vol.23Issue(2)：298-306,9.DOI:10.13234/j.issn.2095-2805.2025.2.298
单管正激变换器传导共模EMI特性分析
Analysis of Conducted Common-mode EMI Characteristics of Single-switch Forward Converter
摘要
Abstract
To study the conducted common-mode(CM)electromagnetic interference(EMI)characteristics of a single-switch forward converter and reduce its CM noise,the analysis of the transmission mechanism of conducted CM noise in the single-switch forward converter is necessary.On this basis,a CM noise transmission path model is established,and a calculation method is proposed to determine the specific external capacitance to reduce the CM noise.In addition,aimed at the defects of the traditional calculation model of induced charge on the secondary side,an improved calculation model is put forward,and simulation results show that the accuracy of the improved model is higher under ideal conditions.Afterwards,the balanced winding method was used to reduce the CM noise flowing through the transformer,and a prototype of single-switch forward converter power supply was used for experimental verification.Results show that the method of calculating the external capacitance was effective,and the accuracy of charge calculated by the improved calculation model was higher when the windings were close or when the number of turns per unit length was relatively large.关键词
电磁干扰/正激变换器/传导共模EMI特性/共模噪声抵消Key words
Electromagnetic interference(EMI)/forward converter/conducted common-mode(CM)EMI characteristics/CM noise offset分类
信息技术与安全科学引用本文复制引用
彭长川,陈为,林苏斌..单管正激变换器传导共模EMI特性分析[J].电源学报,2025,23(2):298-306,9.基金项目
国家自然科学基金资助项目(51777036) （51777036）
福建省自然科学基金资助项目(2022J01565)This work is supported by National Natural Science Foundation of China under the grant 51777036 （2022J01565）
Natural Science Foundation of Fujian Province under the grant 2022J01565 （）
