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Analysis and Experiment for Wireless Power Transfer Systems with Two Kinds Shielding Coils in EVs

Author

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  • Yushan Wang

    (School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
    Key Laboratory for Unmanned Underwater Vehicle, Northwestern Polytechnical University, Xi’an 710072, China)

  • Baowei Song

    (School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China)

  • Zhaoyong Mao

    (School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
    Key Laboratory for Unmanned Underwater Vehicle, Northwestern Polytechnical University, Xi’an 710072, China)

Abstract

Electric vehicles (EVs) with wireless power transfer (WPT) systems are convenient, but WPT technology will produce a strong stray electromagnetic field (EMF) in the surrounding space when the system works with high power. Shielding coils can reduce stray EMF efficiently without additional control, and they have advantages of being simple, light, and cheap. In this paper, the series-opposing structure is compared systematically with the inductive structure based on circuit theory and electromagnetic field theory. Simplified circuit models are proposed to give an intuitive and comprehensive analysis of transfer efficiency. Electric field analysis and finite element analysis (FEA) is used to explain the functional principles of shielding coils and to compare the EMF distribution excited by two structures. The simulation results show that both structures decrease the mutual inductance and perform better than the system without shielding coils when they have the same transfer efficiency. Further, the inductive structure system performs best. The most important between two structures is that the shielding effects is independent of turns of shielding coils for inductive structure, while it can be adjusted by changing turns of shielding coils for the series-opposing structure. The experimental results show that the EMF is reduced by 65% for the inductive structure and 40% for the series-opposing structure. The theoretical analysis is confirmed by experimental results.

Suggested Citation

  • Yushan Wang & Baowei Song & Zhaoyong Mao, 2020. "Analysis and Experiment for Wireless Power Transfer Systems with Two Kinds Shielding Coils in EVs," Energies, MDPI, vol. 13(1), pages 1-18, January.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:1:p:277-:d:305627
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    References listed on IDEAS

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    1. Linlin Tan & Jiacheng Li & Chen Chen & Changxin Yan & Jinpeng Guo & Xueliang Huang, 2016. "Analysis and Performance Improvement of WPT Systems in the Environment of Single Non-Ferromagnetic Metal Plates," Energies, MDPI, vol. 9(8), pages 1-16, July.
    2. Feng Wen & Xueliang Huang, 2016. "Optimal Magnetic Field Shielding Method by Metallic Sheets in Wireless Power Transfer System," Energies, MDPI, vol. 9(9), pages 1-15, September.
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    Cited by:

    1. Changsheng Li & Wenjie Dong & Libo Ding & He Zhang & Hang Sun, 2020. "Transfer Characteristics of the Nonlinear Parity-Time-Symmetric Wireless Power Transfer System at Detuning," Energies, MDPI, vol. 13(19), pages 1-15, October.

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