Design and implementation of a high-frequency inverter with wide soft-switching range for dynamic wireless charging of electric vehicles

To solve the problem that wireless power transfer (WPT) systems with multiple transmitters require more inverters and involve complex phase synchronization control between inverters, a dual-output zero-voltage switching (ZVS) inverter is proposed. It can generate two identical output voltages to realize synchronous driving of two transmitter coils, thereby reducing the number of inverters and switches required by the system, and simplifying system control. The output voltage gain characteristics of the inverter are analyzed and compared with those of existing typical inverters in WPT systems. The equivalent mathematical model of the system is constructed, and the output power characteristics are analyzed. Meanwhile, the operating states for soft-switching are analyzed and calculated. Theoretical analysis and experimental results indicate that the WPT system based on the proposed inverter can maintain high transmission efficiency during the movement of the receiver coil, with the maximum efficiency exceeding 90%.