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author:

Lan, Y. (Lan, Y..) [1] | Zeng, X. (Zeng, X..) [2] | Chen, W. (Chen, W..) [3] (Scholars:陈为) | Chen, Q. (Chen, Q..) [4] (Scholars:陈庆彬)

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Abstract:

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 electromagnetic field distribution inside common-mode chokes, a new high-frequency model is proposed. This new model, when considering inter-winding capacitance, divides the inductance of the differential-mode component of one winding into two equal parts based on existing terminal capacitance. Furthermore, a new inter-winding parasitic capacitance branch is added between the two parts of the inductance, in conjunction with the existing terminal capacitance branch, to simulate the complete inter-winding electric field characteristics. Setting the differential-mode inductance as a coupled inductance with a coupling coefficient of -1 can fully counteract its influence on the common-mode component. This proposed model accurately fits the insertion loss characteristics of the differential-mode component of common-mode chokes under the EN55017 testing standard's multiple resonance points. Secondly, an equivalent circuit model is established under different insertion loss tests. Utilizing principles such as star-to-delta transformation and the Wheatstone bridge balance principle, the equivalent circuit is simplified, and circuit expressions are derived. Then, a comprehensive process for extracting parasitic parameters within the new model is proposed.Experimental conclusions are as follows. (1) Setting the inductance model of the differential-mode component as a coupled inductance with k=—\ does not attenuate common-mode current. (2) Compared with traditional models, the proposed new model exhibits good fitting accuracy within the frequency ränge of 150 kHz to 30 MHz and effectively represents the multi-resonance characteristics of common-mode chokes. © 2025 China Machine Press. All rights reserved.

Keyword:

common-mode chokes Electromagnetic interference extraction of parasitic parameters filter modeling

Community:

  • [ 1 ] [Lan Y.]College of Electrical Engineering, Automation Fuzhou University, Fuzhou, 350108, China
  • [ 2 ] [Zeng X.]College of Electrical Engineering, Automation Fuzhou University, Fuzhou, 350108, China
  • [ 3 ] [Chen W.]College of Electrical Engineering, Automation Fuzhou University, Fuzhou, 350108, China
  • [ 4 ] [Chen Q.]College of Electrical Engineering, Automation Fuzhou University, Fuzhou, 350108, China

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Source :

电工技术学报

ISSN: 1000-6753

Year: 2025

Issue: 6

Volume: 40

Page: 1805-1815

Cited Count:

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ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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