Leakage Magnetic Field Suppression Using Dual-Transmitter Topology in EV Wireless Charging

Guodong Zhu; Dawei Gao; Shulin Lin

Leakage Magnetic Field Suppression Using Dual-Transmitter Topology in EV Wireless Charging

Guodong Zhu

Dawei Gao

Shulin Lin

Vol. 19, No. 3, pp. 625-636, May 2019

10.6113/JPE.2019.19.3.625

Control strategy

Dual-transmitter

EV wireless charging

Finite element analysis

Leakage magnetic field

wireless power transfer

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Abstract

This paper proposes an active leakage magnetic field (LMF) suppression scheme, which uses the dual-transmitter (DT) topology, for EV wireless charging systems (EVWCS). The two transmitter coils are coplanar, concentric and driven by separate inverters. The LMF components generated by the three coils cancel each other out to reduce the total field strength. This paper gives a detailed theoretical analysis on the operating principles of the proposed scheme. Finite element analysis is used to simulate the LMF distribution patterns. Experimental results show that when there is no coil misalignment, 97% of the LMF strength can be suppressed in a 1kW prototype. These results also show that the impact on efficiency is small. The trade-off between LMF suppression and efficiency is revealed, and a control strategy to balance these two objectives is presented.

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Cite this article

[IEEE Style]

G. Zhu, D. Gao, S. Lin, "Leakage Magnetic Field Suppression Using Dual-Transmitter Topology in EV Wireless Charging," Journal of Power Electronics, vol. 19, no. 3, pp. 625-636, 2019. DOI: 10.6113/JPE.2019.19.3.625.

[ACM Style]

Guodong Zhu, Dawei Gao, and Shulin Lin. 2019. Leakage Magnetic Field Suppression Using Dual-Transmitter Topology in EV Wireless Charging. Journal of Power Electronics, 19, 3, (2019), 625-636. DOI: 10.6113/JPE.2019.19.3.625.