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Analysis and Improvement of Magnetic Field Leakage in Toroidal Inductor
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Zhiyong QIU  Student Member, CPSS1, Kaining FU  Member, CPSS1, 3, Wei CHEN  Fellow, CPSS2
Journal of Power Supply | 2025, 23(4) : 360 - 368
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Journal of Power Supply | 2025, 23(4): 360-368
• EMI/EMC •
Analysis and Improvement of Magnetic Field Leakage in Toroidal Inductor
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Zhiyong QIU  Student Member, CPSS1, Kaining FU  Member, CPSS1, 3, Wei CHEN  Fellow, CPSS2
Affiliations
  • 1.School of Electrical Engineering and Automation, Xiamen University of Technology, Xiamen 361024, China
  • 2.College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
  • 3.Xiamen Key Laboratory of Frontier Electric Power Equipment and Intelligent Control, Xiamen 361024, China
Published: 2025-07-30 doi: 10.13234/j.issn.2095-2805.2025.4.360
Outline
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Different winding schemes for a toroidal inductor can affect its magnetic field leakage, which will intensify the near-filed coupling of an electromagnetic interference (EMI) filter. First, the effect of equivalent radial current and tangential current on magnetic field leakage was studied by using the partial element equivalent circuit method, and it was found that the equivalent current loop composed of tangential current was the main source of axial magnetic field leakage in the toroidal inductor. Then, a winding scheme was proposed, in which a PCB was sandwiched by two magnetic cores to generate reverse current loops above and below the PCB for magnetic field cancellation. In the experimental link, three-dimensional finite element simulation was conducted to demonstrate that the proposed scheme can further reduce the axial magnetic field leakage while maintaining a similar inductance as the traditional scheme. The impedance and insertion loss tests of the EMI filter were conducted, and it was verified that compared with the traditional scheme, the novel scheme can weaken the influence of high-frequency parasitic parameters on the inductor’s impedance characteristic, thereby further optimizing the high-frequency filtering performance of the EMI filter.

Toroidal inductor  /  magnetic field leakage  /  electromagnetic interference (EMI) filter  /  insertion loss
邱智勇中国电源学会学生会员, 傅恺宁中国电源学会会员, 陈为中国电源学会会士. 环形电感磁场泄漏分析与改善. 电源学报, 2025 , 23 (4) : 360 -368 . DOI: 10.13234/j.issn.2095-2805.2025.4.360
Zhiyong QIU, Kaining FU, Wei CHEN. Analysis and Improvement of Magnetic Field Leakage in Toroidal Inductor[J]. Journal of Power Supply, 2025 , 23 (4) : 360 -368 . DOI: 10.13234/j.issn.2095-2805.2025.4.360
Funding
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  • National Natural Science Foundation of China(51777036)
Appendix
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Year 2025 volume 23 Issue 4
58
8
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.4.360
  • Receive Date：2023-09-05
  • Online Date：2026-10-26
  • Published：2025-07-30
Article Data
Affiliations
History
  • Received：2023-09-05
  • Revised：2024-01-07
  • Accepted：2024-01-28
Funding
National Natural Science Foundation of China(51777036)
Affiliations
    1.School of Electrical Engineering and Automation, Xiamen University of Technology, Xiamen 361024, China
    2.College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
    3.Xiamen Key Laboratory of Frontier Electric Power Equipment and Intelligent Control, Xiamen 361024, China
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多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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