Design of Ultrasonic Isolation Wireless Power Supply for Gate Drive Circuit of Module Multi-level Converter

This paper designs an ultrasonic isolated wireless power supply for the gate drive circuit of multi-level converter H-bridge inverter, basing on ultrasonic wireless power transmission (USWPT) technology. Firstly, COMSOL model is used to simulate the coupling transmission medium and its size. Then loss circuit model is used to calculate and predict the USWPT receiving side output voltage. Finally, the experiment proves that the resonant compensation circuit designed can effectively improve the output power of USWPT system. The designed ultrasonic isolated wireless power supply can stably provide about 15V DC voltage for 180 Ω~250 Ω load when it works at 43.7 kHz.