A Conformal Split-Ring Loop as a Self-Resonator for Wireless Power Transfer

A conventional printed spiral coil (PSC) has a self-resonant frequency and its equivalent circuit is a parallel inductor-capacitor (LC) circuit. It is desirable to use PSCs in wireless power transfer (WPT) applications; however, these are most commonly constituted by a series-primary and series- or...

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Bibliographic Details
Published in:IEEE access 2020, Vol.8, p.911-919
Main Authors: Wang, Jingchen, Leach, Mark Paul, Lim, Eng Gee, Wang, Zhao, Jiang, Zhenzhen, Pei, Rui, Huang, Yi
Format: Article
Language:English
Subjects:
Equivalent circuits
Impedance
Inductors
LC circuits
Magnetic resonance
magnetic resonance coupling
near fields
Optimization
printed spiral coils
Resonance
Resonant frequencies
Resonant frequency
Resonators
RLC circuits
Spirals
split-ring resonators
Wireless power transfer
Wireless power transmission
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Summary:A conventional printed spiral coil (PSC) has a self-resonant frequency and its equivalent circuit is a parallel inductor-capacitor (LC) circuit. It is desirable to use PSCs in wireless power transfer (WPT) applications; however, these are most commonly constituted by a series-primary and series- or parallel-secondary circuit. This paper proposes a printed conformal split-ring loop with the characteristic of a series LC circuit at its resonance frequency. Regarding the loop as a self-resonator, a magnetic-resonance coupled (MRC) WPT system with series-primary and secondary operating at 433 MHz in the industrial scientific and medical (ISM) band is presented. The maximum measured power transfer efficiency is 87.9% at a transfer distance of 22 mm, the best-reported result for such a configuration.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2019.2918640