Highly effective leakage magnetic field suppression by using a reactive coil in perfectly aligned EV wireless charging systems

Guodong Zhu; Dawei Gao

Highly effective leakage magnetic field suppression by using a reactive coil in perfectly aligned EV wireless charging systems

Guodong Zhu

Dawei Gao

Vol. 20, No. 1, pp. 11-21, Jan. 2020

10.1007/s43236-019-00007-4

DC-to-DC efficiency

EV wireless charging

Finite element analysis

Leakage magnetic field

Reactive coil · Wireless power transfer

Abstract

Using a reactive coil to suppress the leakage magnetic field (LMF) in wireless power transfer is practical, but the suppression capability reported in the literature is still limited. This paper proposes several methods for improving the suppression capability of this scheme. Three conditions are required to realize this goal, namely (1) a good LMF proportionality, (2) an equation regarding the LMF coefficients and mutual inductances, and (3) an equation regarding the impedance of the reactive coil loop. Coil geometry optimization is performed to meet condition (2), and coil reactance is compensated by a capacitor to meet condition (3). Given the trade-off between LMF suppression capability and efficiency, a control strategy based on a switching capacitor array is adopted. In the experiments, a 97.5% reduction in the LMF strength is achieved on the measurement point with slight effects on efficiency.

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Cite this article

[IEEE Style]

G. Zhu and D. Gao, "Highly effective leakage magnetic field suppression by using a reactive coil in perfectly aligned EV wireless charging systems," Journal of Power Electronics, vol. 20, no. 1, pp. 11-21, 2020. DOI: 10.1007/s43236-019-00007-4.

[ACM Style]

Guodong Zhu and Dawei Gao. 2020. Highly effective leakage magnetic field suppression by using a reactive coil in perfectly aligned EV wireless charging systems. Journal of Power Electronics, 20, 1, (2020), 11-21. DOI: 10.1007/s43236-019-00007-4.