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

Longzhao Sun, Houjun Tang and Yingyi Zhang
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Longzhao Sun: Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Houjun Tang: Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Yingyi Zhang: Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Energies, 2015, vol. 8, issue 9, 1-12

Abstract: 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.

Keywords: three-coil; wireless power transfer (WPT); frequency; load-independent output current (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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