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

Linlin Tan, Jiacheng Li, Chen Chen, Changxin Yan, Jinpeng Guo and Xueliang Huang
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Linlin Tan: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Jiacheng Li: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Chen Chen: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Changxin Yan: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Jinpeng Guo: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Xueliang Huang: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China

Energies, 2016, vol. 9, issue 8, 1-16

Abstract: 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.

Keywords: wireless power transfer; resonator; metal; impedance model; ferrite cores (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (10)

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