Low Frequency Medium Power Capacitor-Free Self-Resonant Wireless Power Transfer

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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  • Daniel E. Gaona
  • Yanfeng Shen
  • Hui Zhao
  • K. T. Chau
  • Teng Long


Original languageEnglish
Journal / PublicationIEEE Transactions on Industrial Electronics
Publication statusOnline published - 4 Nov 2020
Externally publishedYes


With the rapid development of wireless power transfer (WPT), the self-resonant WPT system without using additional compensation capacitors has attracted attentions. However, most of reported self-resonant WPT systems have low power transfer (less than 100 W) and high operating frequencies at megahertz. In this paper, four multiple-layer, self-resonant WPT coil pads with different dielectrics are designed and experimentally validated. The aim is to increase the power rating and decrease the operating frequency for capacitor-free WPT system. Analysis of integrated compensation capacitance, inductance, and parasitic capacitance of the coil is provided. Finite Element Analysis (FEA) is used to evaluate four dielectric materials, mica, polypropylene, polyimide, and fiberglass. An experimental setup has been developed, which can achieve more than 360 W power transfer for a 120 mm air gap with an efficiency of 82% and an operating frequency of near 80 kHz.

Research Area(s)

  • Capacitance, capacitor-free, Capacitors, dielectrics, Inductance, Inductors, Receivers, self-resonant, Transmitters, Wireless power transfer