Technology trends of wireless power transfer systems for electric vehicle and plug-in hybrid electric vehicle

A wireless power transfer system is desirable for the recharging of electric vehicles. The system for electric vehicles requires a high efficiency, a large air gap, and a good tolerance to lateral misalignment and needs to be compact and lightweight. This paper describes the characteristics of wireless power transfer system, the subject and solution in the case of applying to electric vehicles. Especially, the difference of characteristics of single-sided winding transformer and double-sided winding transformer is detailed. And new trends of the wireless power transfer system for electric vehicles are introduced.