Multi-coil high efficiency wireless power transfer system against misalignment

Chen Xu, Yuan Zhuang, Hongjian Han, Chaoyun Song, Yi Huang, Jiafeng Zhou

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Citations (Scopus)


The power transfer efficiency of magnetic-resonance coupled wireless power transfer (WPT) systems is sensitive to the alignment of coils. In this paper, a novel multi-coil WPT system is proposed to enhance power transfer efficiency. It can overcome the misalignment problem and maintain high power transfer efficiency. The proposed coil loop structure can provide a strong magnetic resonance coupling between the Tx and Rx coils. There are four induvial resonators applied in the system and it demonstrates that at least a pair of coupled resonators in several misaligned conditions could realize high power transfer efficiency over a misaligned distance. The experimental results show that the proposed multi-loop WPT system can achieve 90.2% peak efficiency when the coils are well aligned. Mean-while, this WPT system maintains over 70% efficiency over a misalignment distance from 0 to 55 mm, which is about 66% of the length of the Rx board. The proposed WPT system could be used either in implant devices for biomedical healthcare and treatment or for electric vehicles charging systems.
Original languageEnglish
Title of host publication2018 IEEE MTT-S International Wireless Symposium (IWS)
ISBN (Electronic)9781538663462
Publication statusPublished - 2 Jul 2018
Event2018 IEEE MTT-S International Wireless Symposium - Chengdu, China
Duration: 6 May 201810 May 2018


Conference2018 IEEE MTT-S International Wireless Symposium
Abbreviated titleIWS 2018


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