A Wideband Strongly Coupled Magnetic Resonance Wireless Power Transfer System and Its Circuit Analysis

Conventional strongly coupled magnetic resonance (SCMR) wireless power transfer (WPT) systems have high quality factor ( Q ), leading to limited system bandwidths. In practical applications, especially in human-involved environments, the resonant frequency of SCMR resonators will shift due to the ef...

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Bibliographic Details
Published in:IEEE microwave and wireless components letters 2018-12, Vol.28 (12), p.1152-1154
Main Authors: Zhou, Wenshen, Sandeep, Srikumar, Wu, Pengde, Yang, Peng, Yu, Wenwei, Huang, Shao Ying
Format: Article
Language:English
Subjects:
Bandwidths
Broadband
Circuit analysis
Circuits
Coils
Equivalent circuits
Integrated circuit modeling
Magnetic resonance
Q factors
Resonant frequencies
Resonators
strongly coupled magnet resonance (SCMR)
Wideband
wideband system
Wireless power transfer
wireless power transfer (WPT)
Wireless power transmission
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Summary:Conventional strongly coupled magnetic resonance (SCMR) wireless power transfer (WPT) systems have high quality factor ( Q ), leading to limited system bandwidths. In practical applications, especially in human-involved environments, the resonant frequency of SCMR resonators will shift due to the effect of highly dielectric human body. In this letter, a wideband four-coil SCMR WPT system is proposed by improving the coupling between the tx/rx coil and their corresponding resonators. The bandwidth is increased by over 100% compared to a conventional system without sacrificing the efficiency much. The wideband feature is demonstrated by both simulation and measurement. It is analyzed physically and by using an equivalent circuit analysis.
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2018.2876767