Automated impedance matching system for robust wireless power transfer via magnetic resonance coupling

Teck Chuan Beh, Masaki Kato, Takehiro Imura, Sehoon Oh, Yoichi Hori

Research output: Contribution to journalArticle

260 Citations (Scopus)


Recently, a highly efficient midrange wireless transfer technology using electromagnetic resonance coupling has been proposed and has received much attention due to its practical range and efficiency. The resonance frequency of the resonators changes as the gap between the resonators changes. However, when this technology is applied in the megahertz range, the usable frequency is bounded by the industrial, scientific, and medical (ISM) band. Therefore, to achieve maximum power transmission efficiency, the resonance frequency has to be fixed within the ISM band. In this paper, an automated impedance matching (IM) system is proposed to increase the efficiency by matching the resonance frequency of the resonator pair to that of the power source. The simulations and experiments verify that the IM circuits can change the resonance frequency to 13.56 MHz (in the ISM band) for different air gaps, improving the power transfer efficiency. Experiments also verified that automated IM can be easily achieved just by observing and minimizing the reflected wave at the transmitting side of the system.

Original languageEnglish
Article number6226848
Pages (from-to)3689-3698
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Issue number9
Publication statusPublished - 1 Jan 2013



  • Automation
  • impedance matching (IM)
  • maximum efficiency
  • resonance frequency
  • wireless power transfer (WPT)

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