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Scheme for providing parity-time symmetry for low-frequency wireless power transfer below 20 kHz

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Abstract

We provided parity-time symmetry (PT symmetry) for a magnetic resonance wireless power transfer (WPT) system designed to operate below 20 kHz. A lightweight coil having a mass of 39.1 g and consisting of a Mn–Zn ferrite core and 0.6-mm-diameter copper wire is considered herein. The coil had a Q factor of 111.5 at 16.5 kHz. The proposed system oscillated at 16.5 kHz for a transmission distance of 15 mm. A transmission power of 7.6 W was achieved when the DC power supply voltage was 100 V. Under these conditions, the power efficiency between the two coils was 92.1%. The oscillation frequency was automatically tuned to the optimal frequency for obtaining the maximum efficiency for a changing transmission distance. The relationship between the transmission power and the transmission distance was very different from that of a conventional WPT system, and an effect of PT symmetry clearly appeared.

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Acknowledgements

The present research was supported in part by the Japan Society for the Promotion of Science, Kakenhi Grant Number 18K04115.

Funding

The Japan Society for the Promotion of Science, Kakenhi Grant Number 18K04115.

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Authors and Affiliations

  1. Department of Applied Physics, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama, 700-0005, Japan

    Hiroki Ishida

  2. National Institute of Technology, Toyama College, Hongo Campus, 13 Hongo-machi, Toyama city, Toyama, 939-8630, Japan

    Hiroto Furukawa

  3. National Institute of Technology, Toyama College, Imizu Campus, 1-2 Ebie-neriya, Imizu city, Toyama, 933-0293, Japan

    Tomoaki Kyoden

Authors
  1. Hiroki Ishida
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  2. Hiroto Furukawa
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  3. Tomoaki Kyoden
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Contributions

Hiroki Ishida: theoretical analysis and development of WPT coils. Contribution ratio: 60%. Hiroto Furukawa: development of electric circuit. Contribution ratio: 20%. Tomoaki Kyoden: theoretical analysis of CMT. Contribution ratio: 20%.

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Correspondence to Hiroki Ishida.

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Conflict of interest

The authors declare that they have no competing interests.

Availability of data and material

All data are available from the corresponding author on reasonable request.

Code availability

Visual studio 2017 (visual C + +), TopSpice Circuit Simulator, LTspice Circuit Simulator, JMAG-Designer, MS-office Excel.

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All authors have agreed to publish from Electrical Engineering.

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Ishida, H., Furukawa, H. & Kyoden, T. Scheme for providing parity-time symmetry for low-frequency wireless power transfer below 20 kHz. Electr Eng 103, 35–42 (2021). https://doi.org/10.1007/s00202-020-01041-3

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  • DOI: https://doi.org/10.1007/s00202-020-01041-3

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