Coupling Tracking and Control in the Dynamic Wireless Charging for Electric Vehicles

In the wireless charging for the moving electric vehicles (EV s), the unstable coupling that largely influences the output robustness is brought by the dynamic manner. In this paper, a control scheme based on a simple LC compensated dynamic wireless charging couplers is proposed, where the exact mutual inductance is extracted by monitoring the direct current (dc) current and voltage outputs. The maximum total efficiency is thus achieved by adjusting the voltage inputs for the transmitters (Txs). A 200mm*100mm Tx array is modeled, and the overlap area is 50% of the size in the simulation and experiment. The performance of the control strategy is proved by the experimental results, and the efficiency could be universally improved by 2.1 %~5.2%.