Application of Parity-Time Symmetry to Low-Frequency Wireless Power Transfer System

• Ishida Hiroki

  Department of Applied Physics, Okayama University of Science

• Kyoden Tomoaki

  National Institute of Technology, Toyama College

• Furukawa Hiroto

  National Institute of Technology, Toyama College

Abstract

In this study, parity-time symmetry (PTS) was applied to a wireless power transfer (WPT) system in the low-frequency range of 30-40kHz. A series-parallel topology was analyzed using the coupled mode theory. It was demonstrated that PTS can be preserved over a long transmission distance even at low frequencies by reducing the self-inductance of the receiver coil. The receiver solenoid coil (dimensions: 71 × 30 × 7.4mm, mass: 45.6g, self-inductance: 119µH) was able to maintain a transmission power of 23±1W and an efficiency of 83±1% within a distance of 12-40mm. In addition, the suitable coil orientation range was significantly increased from ±5° to ±65°. The power conversion efficiency of a switching-mode amplifier based on a class-D inverter reached 97% at low frequency. These results are expected to contribute to the expansion of PTS-WPT applications.

Journal

• IEEJ Journal of Industry Applications

  IEEJ Journal of Industry Applications 11 (1), 59-68, 2022-01-01

  The Institute of Electrical Engineers of Japan

Keywords

• wireless power transfer
• parity time symmetric
• low frequency
• magnetic induction

Details

• CRID: 1390853567321520128
• NII Article ID: 130008139332
• DOI: 10.1541/ieejjia.21002583
• ISSN: 21871108
• ISSN: 21871094
• NDL BIB ID: 031899082
• Web Site: http://id.ndl.go.jp/bib/031899082
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I031899082
• Web Site: https://www.jstage.jst.go.jp/article/ieejjia/11/1/11_21002583/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed