Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Cross-Shaped Magnetic Coupling Structure for Electric Vehicle IPT Charging Systems

  • Ren, Siyuan (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Xia, Chenyang (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Liu, Limin (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Wu, Xiaojie (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Yu, Qiang (School of Electrical and Power Engineering, China University of Mining and Technology)
  • Received : 2017.09.21
  • Accepted : 2018.03.01
  • Published : 2018.07.20
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Abstract

Inductive power transfer (IPT) technology allows for charging of electric vehicles with security, convenience and efficiency. However, the IPT system performance is mainly affected by the magnetic coupling structure which is largely determined by the coupling coefficient. In order to get this applied to electric vehicle charging systems, the power pads should be able to transmit stronger power and be able to better sustain various forms of deviations in terms of vertical, horizontal direction and center rotation. Thus, a novel cross-shaped magnetic coupling structure for IPT charging systems is proposed. Then an optimal cross-shaped magnetic coupling structure by 3-D finite-element analysis software is obtained. At marking locations with average parking capacity and no electronic device support, a prototype of a 720*720mm cross-shaped pad is made to transmit 5kW power at a 200mm air gap, providing a $1.54m^2$ full-power free charging zone. Finally, the leakage magnetic flux density is measured. It indicates that the proposed cross-shaped pad can meet the requirements of the International Commission on Non-Ionizing Radiation Protection (ICNIRP) according to the Australian Radiation Protection and Nuclear Safety Agency (ARPANSA).

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