New Insight of Maximum Transferred Power by Matching Capacitance of a Wireless Power Transfer System

Chunyan Xiao, Yufeng Liu, Dingning Cheng and Kangzheng Wei
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Chunyan Xiao: School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China
Yufeng Liu: School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China
Dingning Cheng: School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China
Kangzheng Wei: School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China

Energies, 2017, vol. 10, issue 5, 1-11

Abstract: Most research on wireless power transfer (WPT) has been focused on how to achieve a high-efficiency power transfer. Our study found that under the impedance matching for achieving maximum WPT efficiency, the power transferred to the load cannot reach the maximum when a WPT system is supplied by an AC voltage source with constant amplitude. However, the load power or the voltage across the load is essential for a low-power electric device such as the implanted medical device where the transfer efficiency is not the priority to be considered. The paper presents a method for achieving maximum power on the load by matching capacitance in a WPT system with given two-coupled-coils. Three sets of matching capacitances for extreme load power were deduced based on the circuit model considering the coil's resistance, and all these three matching make the WPT system operate at the resonant state. Two sets can make the system achieve the global maximum of load power. One set can make the system achieve the local maximum of load power and reach the power transfer efficiency next to 1. Experimental results verified the theoretical calculations. The results can contribute to the compensation design of a practical WPT system for transferring the maximum power to the load.

Keywords: matching capacitance; maximum load power; wireless power transfer; power transfer efficiency (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: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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