Effect of Coupling Between Multiple Transmitters or Multiple Receivers on Wireless Power Transfer

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The operation of wireless power transfer systems with multiple transmitters (TXs) or receivers (RXs) is investigated. With multiple TXs or RXs in a limited space, couplings occur between TXs or between RXs. The frequency conditions for maximum efficiency and power transfer under such couplings are proposed. Effective resonant frequency of the TXs or the RXs is changed due to such couplings, and driving and/or resonant frequencies should therefore be adjusted accordingly. The amount and type of the required adjustments are provided. The efficiencies in these conditions are discussed. These concepts are supported by experiments with couplings between TXs or between RXs. Using the proposed frequency adjustments, 51-65-W power is transferred with 45%-57% efficiency, even with very low coupling coefficients of 0.025-0.063 from TX to RX. This improvement is significant compared to the unadjusted cases where less than 4 W is transferred with only 5%-33% efficiency.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2013-07
Language
English
Article Type
Article
Keywords

CONTACTLESS BATTERY CHARGER; TRANSMISSION-SYSTEM; ENERGY-TRANSFER; MAGNETIC RESONANCES; DESIGN; RESONATORS; IMPLANTS; LINKS

Citation

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, v.60, no.7, pp.2602 - 2613

ISSN
0278-0046
DOI
10.1109/TIE.2012.2196902
URI
http://hdl.handle.net/10203/174507
Appears in Collection
EE-Journal Papers(저널논문)
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