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http://dx.doi.org/10.6113/JPE.2018.18.2.533

Constant Output Power Control Methods for Variable-Load Wireless Power Transfer Systems  

Liu, Xu (School of Electrical and Power Engineering, China University of Mining and Technology)
Clare, Lindsay (Electrical Energy Management Research Group, University of Bristol)
Yuan, Xibo (School of Electrical and Power Engineering, China University of Mining and Technology)
Wang, Jun (Electrical Energy Management Research Group, University of Bristol)
Wang, Chonglin (School of Electrical and Power Engineering, China University of Mining and Technology)
Li, Jianhua (School of Electrical and Power Engineering, China University of Mining and Technology)
Publication Information
Journal of Power Electronics / v.18, no.2, 2018 , pp. 533-546 More about this Journal
Abstract
This study proposes a comprehensive mathematical model that includes coil-system circuit and loss models for power converters in wireless power transfer (WPT) systems. The proposed model helps in understanding the performance of WPT systems in terms of coil-to-coil efficiency, overall efficiency, and output power capacity and facilitates system performance optimization. Three methods to achieve constant output power for variable-load systems are presented based on system performance analysis. An optimal method can be selected for a specific WPT system by comparing the efficiencies of the three methods calculated with the proposed model. A two-coil 1 kW WPT system is built to verify the proposed mathematical model and constant output power control methods. Experimental results show that when the load resistance varies between 5 and $25{\Omega}$, the system output power can be maintained at 1 kW with a maximum error of 6.75% and an average error of 4%. Coil-to-coil and overall efficiencies can be maintained at above 90% and 85%, respectively, with the selected optimal control method.
Keywords
Constant output power; Optimized efficiency; System performance effect factors; Wireless power transfer systems;
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