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Energies 2015, 8(9), 9719-9730; doi:10.3390/en8099719

Determining the Frequency for Load-Independent Output Current in Three-Coil Wireless Power Transfer System

Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Author to whom correspondence should be addressed.
Academic Editor: K. T. Chau
Received: 29 July 2015 / Revised: 25 August 2015 / Accepted: 31 August 2015 / Published: 9 September 2015
(This article belongs to the Special Issue Wireless Power Transfer)
View Full-Text   |   Download PDF [1184 KB, uploaded 9 September 2015]   |  


Conditions for load-independent output voltage or current in two-coil wireless power transfer (WPT) systems have been studied. However, analysis of load-independent output current in three-coil WPT system is still lacking in previous studies. This paper investigates the output current characteristics of a three-coil WPT system against load variations, and determines the operating frequency to achieve a constant output current. First, a three-coil WPT system is modeled by circuit theory, and the analytical expression of the root-mean-square of the output current is derived. By substituting the coupling coefficients, the quality factor, and the resonant frequency of each coil, we propose a method of calculating the frequency for load-independent output current in a three-coil WPT system, which indicates that there are two frequencies that can achieve load-independent output current. Experiments are conducted to validate these analytical results. View Full-Text
Keywords: three-coil; wireless power transfer (WPT); frequency; load-independent output current three-coil; wireless power transfer (WPT); frequency; load-independent output current

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sun, L.; Tang, H.; Zhang, Y. Determining the Frequency for Load-Independent Output Current in Three-Coil Wireless Power Transfer System. Energies 2015, 8, 9719-9730.

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