Automated Impedance Matching System for Robust Wireless Power Transfer via Magnetic Resonance Coupling

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. Howeve...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2013-09, Vol.60 (9), p.3689-3698
Main Authors: Teck Chuan Beh, Kato, M., Imura, T., Sehoon Oh, Hori, Y.
Format: Article
Language:English
Subjects:
Automated
Automation
Circuits
Coils
Couplings
Efficiency
Equations
Equivalent circuits
Impedance
Impedance matching
impedance matching (IM)
Joining
Magnetic resonance
maximum efficiency
Power transfer
resonance frequency
Resonant frequency
Resonators
Studies
Transmission
wireless power transfer (WPT)
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Summary: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.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2012.2206337