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Dynamic impedance compensation for WPT using a compensator in a three-coil wireless power transfer system

Suqi Liu (Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, China and School of Mechanical and Electrical Engineering, Central South University, Changsha, China)
Jianping Tan (Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, China and School of Mechanical and Electrical Engineering, Central South University, Changsha, China)

Circuit World

ISSN: 0305-6120

Article publication date: 13 August 2018

Issue publication date: 18 October 2018

193

Abstract

Purpose

The purpose of this paper is to study the wireless power transfer (WPT) system that always achieves the maximum output power at a fixed angular frequency using the dynamic impedance compensation and also the maximum transfer efficiency.

Design/methodology/approach

An efficient topology of the WPT system is proposed which states that the functions of the relay are transformed into the functions of the compensator in the three-coil WPT system.

Findings

Increasing the ratio of the frequency detuning factor of the compensator relative to the frequency detuning factor of the compensator also causes the curves of the normalized output power and the transfer efficiency to move toward the high frequency direction.

Practical implications

The scheme of the dynamic compensation for the WPT using a compensator is convenient to obtain the dynamic impedance compensation by adding or removing the capacitances or inductances from the compensator.

Originality/value

The functions of the relay are transformed into the functions of the compensator in the three-coil WPT system.

Keywords

Acknowledgements

The work was supported by National Key Basic Research Program of China (2014CB049405).

Citation

Liu, S. and Tan, J. (2018), "Dynamic impedance compensation for WPT using a compensator in a three-coil wireless power transfer system", Circuit World, Vol. 44 No. 4, pp. 171-177. https://doi.org/10.1108/CW-04-2018-0022

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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