Miniaturization Design of Y-capacitor-free Isolated Switching Power Supply EMI Filter

LIN Subin; WANG Jinpeng; HUANG Liangyu; WANG Lixiang; CHEN Wei

doi:10.13334/j.0258-8013.pcsee.252331

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Miniaturization Design of Y-capacitor-free Isolated Switching Power Supply EMI Filter

更新时间：2026-10-19

- Miniaturization Design of Y-capacitor-free Isolated Switching Power Supply EMI Filter
- Vol. 46, Issue 17, Pages: 6422-6432(2026)
- 作者机构：
  
  福州大学电气工程与自动化学院,福建省,福州市,350108
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.252331
  CLC：
- Published：2026
- 稿件说明：
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LIN Subin, WANG Jinpeng, HUANG Liangyu, et al. Miniaturization Design of Y-capacitor-free Isolated Switching Power Supply EMI Filter[J]. 2026, 46(17): 6422-6432.
DOI：

LIN Subin, WANG Jinpeng, HUANG Liangyu, et al. Miniaturization Design of Y-capacitor-free Isolated Switching Power Supply EMI Filter[J]. 2026, 46(17): 6422-6432. DOI： 10.13334/j.0258-8013.pcsee.252331.

摘要

现有的无Y电容电磁干扰(electromagnetic interference，EMI)滤波器设计方法存在体积大、成本高的问题，为了实现小型化设计，以PFC+QR反激电路的无Y电容EMI滤波器为研究对象，在噪声传输机理分析基础上，建立考虑高频寄生参数和噪声源内阻抗的无Y电容EMI滤波器插入损耗数学模型；其次，明确噪声源内阻抗、共模电感、差模电感的耦合系数是影响无Y电容EMI滤波器插入损耗特性的关键影响因素；然后，基于插入损耗数学模型，通过差、共模滤波能力协调性分析，提出基于共模噪声源内阻抗优化结合磁集成差模电感的无Y电容EMI滤波器设计方法，并给出磁集成差模电感的设计准则；最后，实验验证所提出的EMI滤波器设计方法可有效实现无Y电容EMI滤波器的小型化设计。

Abstract

Existing Y-capacitor-free electromagnetic interference (EMI) filter design methods suffer from large volume and high cost. To achieve miniaturization

this study focuses on the Y-capacitor-free EMI filter of the PFC+QR flyback circuit. Based on the analysis of noise transmission mechanism

a mathematical model of insertion loss for the Y-capacitor-free EMI filter considering high-frequency parasitic parameters and noise source internal impedance is established. It is clarified that the noise source internal impedance

common-mode inductor

and coupling coefficient of differential-mode inductor are the key factors affecting the insertion loss characteristics of the Y-capacitor-free EMI filter. Drawing on the insertion loss mathematical model

through the coordination analysis of differential and common-mode filtering capabilities

a Y-capacitor-free EMI filter design method based on optimization of the common-mode noise-source internal impedance combined with magnetically integrated differential-mode inductor is proposed

and the design criteria for the magnetically integrated differential-mode inductor are given. Finally

experimental results verify that the proposed EMI filter design method can effectively achieve the miniaturization of the Y-capacitor-free EMI filter.

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Related Author

ZHAI Guo-fu

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LIN Subin

ZHOU Yun

ZHANG Liping

CHEN Wei

Related Institution

Military Apparatus Research Institute, Harbin Institute of Technology

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