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Energies 2015, 8(8), 8355-8370; doi:10.3390/en8088355

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

1
College of Engineering, University of Georgia, Athens, GA 30602, USA
2
Southern Company Services, Inc., Birmingham, AL 35291, USA
*
Author to whom correspondence should be addressed.
Academic Editor: K. T. Chau
Received: 2 July 2015 / Revised: 27 July 2015 / Accepted: 28 July 2015 / Published: 7 August 2015
(This article belongs to the Special Issue Wireless Power Transfer)
View Full-Text   |   Download PDF [2334 KB, uploaded 7 August 2015]   |  

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. View Full-Text
Keywords: wireless power transfer; wireless charging; inductive power transfer; electric vehicles wireless power transfer; wireless charging; inductive power transfer; electric vehicles
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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

Gao, Y.; Farley, K.B.; Tse, Z.T.H. A Uniform Voltage Gain Control for Alignment Robustness in Wireless EV Charging. Energies 2015, 8, 8355-8370.

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