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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2023-05-14
Electromagnetic Field Safety Analysis of a 7.7 kW Wireless Power Transfer System for Electric Vehicles
By
Songtao Liu,

    Dr. Songtao Liu

    Department of Environmental Science and Engineering

    North China Electric Power University

    China

    Homepage

Deguan Li,

    Mr. Deguan Li

    Department of Environmental Science and Engineering

    North China Electric Power University

    China

    Homepage

Chuanmin Chen,

    Prof. Chuanmin Chen

    Department of Environmental Science and Engineering

    North China Electric Power University

    China

    Homepage

Wenbo Jia,

    Dr. Wenbo Jia

    Department of Environmental Science and Engineering

    North China Electric Power University

    China

    Homepage

Kai Che,

    Dr. Kai Che

    State Grid Hebei Electric Power Co., Ltd

    China

    Homepage

Jinxing Yu

    Dr. Jinxing Yu

    State Grid Hebei Electric Power Co., Ltd

    China

    Homepage

Progress In Electromagnetics Research M, Vol. 117, 1-12, 2023
doi:10.2528/PIERM23030401 | Google Scholar

Abstract
The safety of the electromagnetic environment of wireless power transfer (WPT) systems is one of the prerequisites for the application of wireless charging technology for electric vehicles (EVs). The electromagnetic characteristics of a wireless charging EV with a new 7.7 kW WPT system were modeled and analyzed in this paper. Firstly, a complete model of the magnetic coupler was built as a source of electromagnetic radiation, and an external excitation source was added by coupling the resonant coils to the double inductor-capacitor-capacitor (LCC-LCC) topology circuit model. Secondly, the finite element analysis software COMSOL Multiphysics was used to solve for the magneto-quasi-static values to verify the electromagnetic safety of the wireless charging process. Then, two charging scenarios were investigated when the GA and VA aligned and misaligned, involving lateral offset and longitudinal offset cases. Finally, the simulation results were compared and analyzed, showing that the values of electromagnetic fields become higher as the offset distance increases. In worst-case scenarios, the highest magnetic flux density (1.1 μT) is observed in the virtual plane of the test on the left side of the vehicle, which occupies only 17.6% of the limits specified in ICNIRP 1998 (6.25 μT), indicating a good EMF safety performance of the wireless charging system.
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Citation
Songtao Liu, Deguan Li, Chuanmin Chen, Wenbo Jia, Kai Che, and Jinxing Yu, "Electromagnetic Field Safety Analysis of a 7.7 kW Wireless Power Transfer System for Electric Vehicles," Progress In Electromagnetics Research M, Vol. 117, 1-12, 2023.
doi:10.2528/PIERM23030401
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