Abstract
Low efficiency is the key factor restricting the development of EV wireless charging systems in recent years. In order to improve the efficiency, the main circuit of the system is simplified by removing the DC/DC circuit and replacing full bridge inverter with half bridge inverter. And the output power control strategy is optimized by changing the duty cycle of PWM that controls the inverter. Besides, the peaks are reduced by changing the frequency of the system, and the output power can also be controlled by changing frequency. The performance of two most common magnetic couplers is compared and a direction of how to select couplers is given. The methods are all verified by simulations and experiments. By optimizing of the circuit and control strategy, the efficiency and the safety of the system are all improved.
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