电磁干扰滤波器中共模扼流圈的高频模型  

High-Frequency Model of Common-Mode Choke in Electromagnetic Interference Filters

作　　者：兰宇杰 曾晓辉 陈为[1] 陈庆彬[1] Lan Yujie;Zeng Xiaohui;Chen Wei;Chen Qingbin(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,福州350108

出　　处：《电工技术学报》2025年第6期1805-1815,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51777036);《台达电力电子科教发展计划》资助项目。

摘　　要：在电磁干扰(EMI)滤波器的设计和功率变换器的EMI噪声预测中,共模扼流圈的精确建模至关重要。然而,在高频下受共模扼流圈寄生参数的影响,现有模型难以准确表征其滤波特性。该文分析现有模型的缺点在于无法完整反映共模扼流圈的内部电场特性,因此根据共模扼流圈差模分量在高频下的插入损耗谐振点特性提出一种新的高频模型,该模型通过综合考虑端部和绕组中间寄生电容的影响从而完整表征差模分量的电场特性,并解析新模型电路结构给出模型中寄生参数的提取流程。实验结果表明,新模型在150 kHz~30 MHz下具有良好的拟合精度,证明了该模型的准确性。As power electronic power converters move towards higher frequencies,it exacerbates the electromagnetic interference(EMI)issues in power electronic systems.Accurate modeling of common-mode chokes is crucial in designing EMI filters and predicting EMI noise in power converter systems.However,existing models struggle to represent the complex parasitic parameter structure inside common-mode chokes accurately.It leads to significant discrepancies between the actual filtering characteristics of common-mode chokes operating at high frequencies and their ideal designs.Particularly concerning are the insertion loss characteristics at multiple resonance points,where existing models struggle to fit the multi-resonance characteristics of common-mode chokes and exhibit entirely different insertion loss trends at high frequencies.Common-mode chokes can be divided into common-mode and differential-mode components based on the flow path of their magnetic flux.This paper primarily focuses on the analysis and modeling of the differential-mode component.The impedance testing method of traditional common-mode choke differential-mode models does not comply with the EN55017 testing standard.The main difference is that traditional impedance testing typically involves shorting one port of the common-mode choke to measure the differential-mode component.However,shorting the port alters the actual path of the differential-mode current,thereby failing to accurately characterize the complete inter-winding capacitance distribution of common-mode chokes,resulting in different trends between the two testing methods above 10 MHz.Additionally,the traditional common-mode choke differential-mode model assumes ideal inductance.However,when connected in series with the common-mode component at high frequencies,this idealization alters the filtering characteristics of the model's common-mode component.Therefore,the proposed differential-mode model should not exhibit a counteracting effect on common-mode current. Firstly, by analyzing the electromagn

关 键 词：电磁干扰 滤波器 共模电感 寄生参数提取 建模 

分 类 号：TM614[电气工程—电力系统及自动化]