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Modeling of EMI Filter in Wide-band Frequency Range and Optimization of Filtering Characteristics
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Kaining FU  Member, CPSS1, 2, Zhenzhu LIAN1, Wei CHEN  Fellow, CPSS3
Journal of Power Supply | 2025, 23(4) : 350 - 359
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Journal of Power Supply | 2025, 23(4): 350-359
• EMI/EMC •
Modeling of EMI Filter in Wide-band Frequency Range and Optimization of Filtering Characteristics
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Kaining FU  Member, CPSS1, 2, Zhenzhu LIAN1, Wei CHEN  Fellow, CPSS3
Affiliations
  • 1.School of Electrical Engineering and Automation, Xiamen University of Technology, Xiamen 361024, China
  • 2.Xiamen Key Laboratory of High-end Power Equipment and Intelligent Control, Xiamen 361024, China
  • 3.College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
Published: 2025-07-30 doi: 10.13234/j.issn.2095-2805.2025.4.350
Outline
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The electromagnetic interference (EMI) filter is an effective approach to suppressing EMI. However, due to the influence of high-frequency parasitic parameters, EMI filters are difficult to effectively suppress high-frequency EMI noises. In this paper, the characteristics of high-frequency parasitic parameters of EMI filter components including common-mode (CM) inductor and X capacitor are analyzed, and a high-frequency model exhibiting the wide-band impedance characteristics of filter components is established. Moreover, the influence of frequency-varying permeability of ferrite cores on the parasitic parameter cancellation effect is analyzed. The extraction method for the equivalent parallel capacitance of the CM inductor is investigated, the selection of CM inductor cancellation capacitance is optimized, and the wide-band noise filtering of the CM inductor is realized. The wide-band noise filtering characteristics of the whole EMI filter are predicted by finite element simulation. Combined with the simulation and experimental test of insertion loss, the effectiveness of the proposed EMI filter frequency-domain modeling method and the selection basis of CM inductor cancellation capacitance considering the frequency variation of permeability was verified.

Electromagnetic interference (EMI) filter  /  parasitic parameter cancellation  /  insertion loss  /  frequency-domain modeling  /  high-frequency characteristics of magnetic core
傅恺宁中国电源学会会员, 连振珠, 陈为中国电源学会会士. EMI滤波器宽频段建模与滤波特性优化. 电源学报, 2025 , 23 (4) : 350 -359 . DOI: 10.13234/j.issn.2095-2805.2025.4.350
Kaining FU, Zhenzhu LIAN, Wei CHEN. Modeling of EMI Filter in Wide-band Frequency Range and Optimization of Filtering Characteristics[J]. Journal of Power Supply, 2025 , 23 (4) : 350 -359 . DOI: 10.13234/j.issn.2095-2805.2025.4.350
Funding
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  • National Natural Science Foundation of China(51777036)
  • Natural Science Foundation of Xiamen, China(3502Z202372043)
Appendix
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Year 2025 volume 23 Issue 4
63
17
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.4.350
  • Receive Date：2024-06-25
  • Online Date：2026-10-26
  • Published：2025-07-30
Article Data
Affiliations
History
  • Received：2024-06-25
  • Revised：2024-08-09
  • Accepted：2024-08-13
Funding
National Natural Science Foundation of China(51777036)
Natural Science Foundation of Xiamen, China(3502Z202372043)
Affiliations
    1.School of Electrical Engineering and Automation, Xiamen University of Technology, Xiamen 361024, China
    2.Xiamen Key Laboratory of High-end Power Equipment and Intelligent Control, Xiamen 361024, China
    3.College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
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