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Energies 2018, 11(4), 878; https://doi.org/10.3390/en11040878

Omnidirectional Wireless Power Transfer System Based on Rotary Transmitting Coil for Household Appliances

School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
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Received: 1 March 2018 / Revised: 22 March 2018 / Accepted: 22 March 2018 / Published: 10 April 2018
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Abstract

An omnidirectional magnetically coupled resonant wireless power transfer (WPT) system based on rotary transmitting coil is presented. The proposed scheme can ease the variations of the transfer efficiency and output power caused by the deviation of transfer direction, and improve the unbalanced power distribution phenomenon between the receivers, which are still not fully achieved in current WPT systems. The modified coupled-mode model is built first to describe the non-rotary multi-receiver WPT system. The analysis indicates that the transfer efficiency and output power of the system can be expressed as functions of the deviation angle between the transmitting coil and receiving coil, which has a non-negligible influence on the system performances. Then, the modified high order coupled-mode model containing time-varying parameters about the deviation angle is derived for the proposed omnidirectional WPT system. Theoretical analysis and simulated results indicate that this system can transfer power to multiple receivers around the transmitter synchronously and evenly, which is very suitable for wireless charging for household appliances indoors. The scheme feasibility and theoretical analysis are verified by experimental results. View Full-Text
Keywords: coupled mode model; magnetically coupled resonant; omnidirectional; rotary coil; wireless power transfer (WPT) coupled mode model; magnetically coupled resonant; omnidirectional; rotary coil; wireless power transfer (WPT)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Liu, G.; Zhang, B.; Xiao, W.; Qiu, D.; Chen, Y.; Guan, J. Omnidirectional Wireless Power Transfer System Based on Rotary Transmitting Coil for Household Appliances. Energies 2018, 11, 878.

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