A Uniform Voltage Gain Control for Alignment Robustness in Wireless EV Charging

Yabiao Gao, Kathleen Blair Farley and Zion Tsz Ho Tse
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Yabiao Gao: College of Engineering, University of Georgia, Athens, GA 30602, USA
Kathleen Blair Farley: Southern Company Services, Inc., Birmingham, AL 35291, USA
Zion Tsz Ho Tse: College of Engineering, University of Georgia, Athens, GA 30602, USA

Energies, 2015, vol. 8, issue 8, 1-16

Abstract: The efficiency of wireless power transfer is sensitive to the horizontal and vertical distances between the transmitter and receiver coils due to the magnetic coupling change. To address the output voltage variation and efficiency drop caused by misalignment, a uniform voltage gain frequency control is implemented to improve the power delivery and efficiency of wireless power transfer under misalignment. The frequency is tuned according to the amplitude and phase-frequency characteristics of coupling variations in order to maintain a uniform output voltage in the receiver coil. Experimental comparison of three control methods, including fixed frequency control, resonant frequency control, and the proposed uniform gain control was conducted and demonstrated that the uniform voltage gain control is the most robust method for managing misalignment in wireless charging applications.

Keywords: wireless power transfer; wireless charging; inductive power transfer; electric vehicles (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 complete reference list from CitEc
Citations: View citations in EconPapers (10)

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