Multiload Wireless Power Transfer System With Constant Output Power and Efficiency

For a multiload wireless power transfer (WPT) system, it has always been a challenge to maintain constant output power with constant efficiency for each load when the coupling conditions change. Besides, the unbalanced power distribution and cross-coupling among loads are also the key issues. In ord...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2022-01, Vol.58 (1), p.1101-1114
Main Authors: Luo, Chengxin, Qiu, Dongyuan, Gu, Wenchao, Zhang, Bo, Chen, Yanfeng, Xiao, Wenxun
Format: Article
Language:English
Subjects:
Capacitors
Circuits
Coils
Constant output
Controllability
Couplings
Cross coupling
Efficiency
Electric power distribution
Integrated circuit modeling
multiple loads
parity-time symmetry
Power generation
Receivers
Resistance
Resonant frequencies
Resonant frequency
Symmetry
Time sharing
time-sharing control strategy
wireless power transfer (WPT)
Wireless power transmission
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Summary:For a multiload wireless power transfer (WPT) system, it has always been a challenge to maintain constant output power with constant efficiency for each load when the coupling conditions change. Besides, the unbalanced power distribution and cross-coupling among loads are also the key issues. In order to solve these problems, a novel multiload WPT system combining the parity-time (PT) symmetry principle and time-sharing control strategy is proposed. First, the multiload PT-symmetric WPT (PT-WPT) system with single natural resonant frequency is modeled and analyzed based on the circuit model. Then, a multiload PT-WPT system with time-sharing control strategy is constructed by adding a controllable resonant capacitor array at the transmitter. The time-sharing control strategy is realized by periodically turning on / off a controllable resonant capacitor selectively, which enables a single transmitter to supply power to multiple loads with different natural resonant frequencies, and each load realizes PT transmission characteristics. Further, using the time-sharing control strategy, the power distribution among multiple loads is realized by only controlling the duty cycle of each load. Finally, two dual-load PT-WPT experiments are designed and carried out. Experimental results show that each load can maintain constant output power with constant transfer efficiency about 90% in a wide coupling range, and realize power distribution at desired values simultaneously.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2021.3103493