Fundamental Discussion on a Wireless Power Transfer System Equipped with a Common Secondary Coil During Parking and Driving

Since electric vehicles (EVs) suffer from a long charging time and a short mileage, they have not yet formed a full-scale market. A dynamic wireless power transfer system that can supply electric power to the vehicles during driving has been expected as an effective means to solve the above issues. When the primary coils are connected in series, the dynamic wireless power transfer system becomes the same in equivalent circuit as a stationary wireless power transfer system. As a result, the dynamic system is of great advantage for the common use of the secondary coils for parking and driving. This paper provides a fundamental discussion on the dynamic wireless power transfer system with focus on the secondary coils, along with experimental results.