Since EV has the subject that a vehicles price with the long charging time with short mileage is high, it has not resulted in full-scale spread. The dynamic contactless power transfer system which performs an electric power supply on the vehicles under drive is expected as a means to solve the subject of EV. There are some problems resulting from the loop coil being used for the dynamic contactless power transfer system. The first problem is that it is incompatible with the stationary contactless power transfer system. In the stationary contactless power transfer system, since the ground coil of a different type from a loop coil is adopted, the vehicles must install two coils, under parking and driving. The space reservation for installing a coil by passenger car is difficult, and is not practical. The second problem is that the leakage flux and the radiation noise become large. The third problem is that a construction period and a repair period become long. In this paper, the dynamic contactless power transfer system which has the following features is proposed and a simulation and an experimental result show the validity. The feature of the system to propose is as follows. The ground coil of a proposal system is the same as that of the stationary contactless power transfer system, and electric supply becomes possible also while parking also driving. The proposal system consists of same ground side coil as the stationary contactless power transfer system, and a vehicles side coil, and leakage flux and a radiation noise are small. Since a proposal system vacates an interval and installs a ground coil, construction period shortening and price reduction of a system of it are attained.
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