Estimation and Positioning Control of Lateral Displacement Using Coil Current in Dynamic Wireless Power Transfer with Rectangular Coil on Dynamic Bench

Dynamic wireless power transfer has been studied to extend the cruising distance of the electric vehicles. However, the lateral displacement between coils decreases the efficiency. Previous research has proposed methods to keep the mutual inductance high by estimating the displacement and eliminating it by moving the vehicle sideways to deal with this problem. However, the proposed method in the previous research cannot be applied to dynamic wireless power transfer with rectangular coils. This paper proposes a method to deal with the lateral displacement in the dynamic wireless power transfer system with rectangular coils by estimating the lateral displacement from the receiver side DC current and moving the vehicle toward the center of the transmitter coils. In the experiment on a dynamic bench, nine cases of lateral displacements were all eliminated, and the efficiency was improved up to 12.4% when the lateral displacement was 75mm.