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Open AccessArticle

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
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Author to whom correspondence should be addressed.
Academic Editor: K. T. Chau
Energies 2015, 8(9), 9719-9730; https://doi.org/10.3390/en8099719
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)
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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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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