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Energies 2015, 8(10), 10664-10683; doi:10.3390/en81010664

Design Considerations for Wireless Charging Systems with an Analysis of Batteries

1
Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, China
2
College of Automotive Studies, Tongji University, Shanghai 201804, China
*
Author to whom correspondence should be addressed.
Academic Editor: K. T. Chau
Received: 31 July 2015 / Revised: 27 August 2015 / Accepted: 22 September 2015 / Published: 25 September 2015
(This article belongs to the Special Issue Wireless Power Transfer)

Abstract

Three criteria, including charging time, effective charging capacity and charging energy efficiency, are introduced to evaluate the CC (constant current) and CC/CV (constant current/constant voltage) charging strategies. Because the CC strategy presents a better performance and most resonant topologies have the CC characteristic, the CC strategy is more suitable for the design of wireless charging systems than the CC/CV strategy. Then, the state space model of the receiver is built to study the system dynamic characteristics, and the design of nonuse output filter capacitors is proposed, which can improve the system power density and avoid the drop in efficiency caused by capacitor degradation. At last, an electrochemical impedance spectrum (EIS) based analysis method is introduced to validate that the design without output filter capacitors has no effects on the battery characteristics when the charging frequency is higher than 460 Hz. A prototype is fabricated to verify our research results. View Full-Text
Keywords: wireless charging system; charging strategy; state space model; EIS wireless charging system; charging strategy; state space model; EIS
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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Wang, Z.; Wei, X. Design Considerations for Wireless Charging Systems with an Analysis of Batteries. Energies 2015, 8, 10664-10683.

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