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

Gongjun Liu, Bo Zhang, Wenxun Xiao, Dongyuan Qiu, Yanfeng Chen and Jiu Guan
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Gongjun Liu: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
Bo Zhang: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
Wenxun Xiao: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
Dongyuan Qiu: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
Yanfeng Chen: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
Jiu Guan: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China

Energies, 2018, vol. 11, issue 4, 1-16

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.

Keywords: coupled mode model; magnetically coupled resonant; omnidirectional; rotary coil; wireless power transfer (WPT) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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