Suppression of Leakage Magnetic Fields in Wireless Power Transfer Using a Sandwich Structure

This study proposes a wireless power transfer (WPT) system using a sandwich structure comprising two transmitter coils and two receiver coils with distinct magnetic field configuration modes. The primary objective of this research is to suppress leakage magnetic fields while maintaining high power t...

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Bibliographic Details
Published in:IEEE access 2024, Vol.12, p.103941-103948
Main Authors: Akiyama, Misato, Arai, Hiroaki, Sano, Hiroyasu, Obata, Teru, Arai, Ryujin, Suzuki, Yukihisa, Taki, Masao
Format: Article
Language:English
Subjects:
Coils
Efficiency
Electromagnetic fields
Electromagnetic interference
Magnetic field configurations
Magnetic field leakage
Magnetic fields
Magnetic flux leakage testing
Magnetic resonance
magnetic resonance methods
Magnetic shielding
Receivers
Sandwich structures
Transmission efficiency
Transmitters
Wireless power transfer
wireless power transfer (WPT)
Wireless power transmission
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Summary:This study proposes a wireless power transfer (WPT) system using a sandwich structure comprising two transmitter coils and two receiver coils with distinct magnetic field configuration modes. The primary objective of this research is to suppress leakage magnetic fields while maintaining high power transfer efficiency. The results of the electromagnetic field analysis and experimental tests demonstrated that the magnetic field leakage of the differential-differential (DD) mode of the sandwich structure was significantly lower than that of the conventional structure, which employs a single coil pair and the cumulative-cumulative (CC) mode of the sandwich structure. Compared to the conventional and CC modes, the leakage magnetic field of the DD mode decreased by 10.1-12.3 dB at 1 m from the coils. This corresponds to suppressing the magnetic field leakage by approximately 76.0% compared to the conventional mode and 68.7% compared to the CC mode. These reductions were attributed to antiphase magnetic fields canceling each other in the DD mode. Moreover, the power transfer efficiency in the DD mode exceeds 95%. The proposed system was shown to effectively suppress electromagnetic interference without compromising transmission efficiency.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2024.3433439