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Energies 2017, 10(1), 135; doi:10.3390/en10010135

A High Efficiency Charging Strategy for a Supercapacitor Using a Wireless Power Transfer System Based on Inductor/Capacitor/Capacitor (LCC) Compensation Topology

School of Electrical Engineering, Beijing Jiaotong University, No. 3 Shangyuancun, Beijing 100044, China
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Author to whom correspondence should be addressed.
Academic Editor: Hongjian Sun
Received: 14 October 2016 / Revised: 22 December 2016 / Accepted: 12 January 2017 / Published: 21 January 2017
(This article belongs to the Special Issue Wireless Power Transfer 2016)
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Abstract

In the application of rail transit vehicles, when using typical wireless power transfer (WPT) systems with series–series (SS) compensation supply power for supercapacitors, the output current is in an approximately inverse relationship with the duty cycle in a wide range. This renders the typical buck circuit control inappropriate. In order to help resolve the above issues, this paper designs inductor/capacitor/capacitor (LCC) compensation with new compensation parameters, which can achieve an adjustable quasi-constant voltage from the input of the inverter to the output of the rectifier. In addition, the two-port network method is used to analyze the resonant compensation circuit. The analysis shows that LCC compensation is more suitable for the WPT system using the supercapacitor as the energy storage device. In the case of LCC compensation topology combined with the charging characteristics of the supercapacitor, an efficient charging strategy is designed, namely first constant current charging, followed by constant power charging. Based on the analysis of LCC compensation, the system has an optimal load, by which the system works at the maximum efficiency point. Combined with the characteristics of the constant voltage output, the system can maintain high efficiency in the constant power stage by making constant output power the same as the optimal power point. Finally, the above design is verified through experiments. View Full-Text
Keywords: wireless power transfer; inductor/capacitor/capacitor (LCC) compensation; supercapacitor load; quasi-constant voltage gain; charging strategy wireless power transfer; inductor/capacitor/capacitor (LCC) compensation; supercapacitor load; quasi-constant voltage gain; charging strategy
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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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Geng, Y.; Li, B.; Yang, Z.; Lin, F.; Sun, H. A High Efficiency Charging Strategy for a Supercapacitor Using a Wireless Power Transfer System Based on Inductor/Capacitor/Capacitor (LCC) Compensation Topology. Energies 2017, 10, 135.

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