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Energies 2016, 9(8), 576;

Analysis and Performance Improvement of WPT Systems in the Environment of Single Non-Ferromagnetic Metal Plates

Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Jiangsu Key Laboratory of Smart Grid Technology and Equipment, Zhenjiang 212009, China
State Grid Jiangsu Economic Research Institute, Nanjing 210096, China
Author to whom correspondence should be addressed.
Academic Editor: Sheldon S. Williamson
Received: 29 March 2016 / Revised: 28 June 2016 / Accepted: 28 June 2016 / Published: 25 July 2016
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Wireless power transfer (WPT) is greatly affected when the transmission channel is surrounded by non-ferromagnetic metallic objects and the alternating magnetic field interacts with the metal conductor, which is more of an issue in wirelessly charged electric vehicle (EV) applications. This paper analyses the performances of a WPT system in an environment with a non-ferromagnetic metal plate. The impedance model of the WPT system in the metal environment is established. Moreover the variation law of a coil’s equivalent inductance and resistance is deduced when the coil is surrounded by the non-ferromagnetic metal plate. Meanwhile, simulations, theory and experiments all confirm that the model is correct. Finally, since the system performance of a wireless charging system is influenced by non-ferromagnetic metals, this paper puts forward a method to improve the performance, that is, to place ferrite cores between the receiving coil and a metal plate. Experiments are carried out to verify the method, and the desired results are achieved. View Full-Text
Keywords: wireless power transfer; resonator; metal; impedance model; ferrite cores wireless power transfer; resonator; metal; impedance model; ferrite cores

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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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Tan, L.; Li, J.; Chen, C.; Yan, C.; Guo, J.; Huang, X. Analysis and Performance Improvement of WPT Systems in the Environment of Single Non-Ferromagnetic Metal Plates. Energies 2016, 9, 576.

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