Power Control Method of Wireless Power Transfer System Using Matrix Converter for Electric Vehicles

Wireless power transfer technology is essential for the widespread use of electric vehicles. Conventional curcuit of wireless power transfer system needs two times power convertion, therefore it increases power loss. Also, wireless power transfer system which communicates controller and vehicles will be unstable when communication delay occurs because of high frequency power transfer. This paper proposes curcuit that realizes downsise and high efficiency using matrix converter as power converter for ground side. Furthrermore, it proposes a fast and safe power control method of no communication delay by detecting power of ground side. The effectiveness of the proposed control method is confirmed by experiments.