Original scientific paper
https://doi.org/10.1080/00051144.2022.2102513
Efficiency improvement of a three-coil WPT system with rectified load based on a selected compensation capacitor
Han Liu
; College of Energy and Electrical Engineering, Hohai University, Nanjing, People’s Republic of China
Jing Lu
; Changzhou Power Supply Branch, State Grid Jiangsu Electric Power Co., Ltd., Changzhou, People’s Republic of China
Abstract
In the existing pieces of literature about the three-coil wireless power transfer (WPT) system, a three-coil structure is proposed to increase the efficiency compared to the two-coil WPT system. The cross-coupling among three coils, compensation capacitor of the repeating coil (RPC) and the rectified load are considered incompletely. The circuit model of a three-coil WPT system with rectified load is developed by taking the cross-coupling of all coils and the compensation capacitor of RPC into consideration in this paper. The relationship among system efficiency, compensation level, and rectifier load is deduced. The detailed mathematical analysis and compensation capacitor selection of RPC are investigated to improve the system efficiency. An experimental study demonstrates that the selected compensation capacitor of RPC achieves a higher efficiency than resonant compensation in a three-coil WPT system with different cross-coupling conditions and rectifier load conditions. System efficiency is promoted from 73.9% (resonant compensation capacitor for RPC) to 84.2% (selected compensation capacitor for RPC).
Keywords
Wireless power transfer; compensation capacitor selection; rectified load; cross-coupling
Hrčak ID:
287946
URI
Publication date:
7.9.2022.
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