A Frequency Quadrupler Inverter Architecture for High-Power High-Frequency Capacitive Wireless Power Transfer Systems

This paper proposes a frequency quadrupler inverter architecture for high-power high-frequency capacitive wireless power transfer systems. The proposed architecture reduces the inverter transistors' switching frequency by a factor of four compared to a full-bridge inverter, thereby improving transistor switching performance and reducing high-frequency-dependent losses. The working of the frequency quadrupler architecture is discussed in detail and is supported by analytical and simulation results. Next, different high-frequency capacitive WPT systems are designed using a conventional inverter, frequency doubler inverter and the proposed inverter and the tradeoffs and optimizations between the system parameters are studied. Finally, the findings of this study are verified by a prototype 6.78-MHz 12-cm air-gap capacitive WPT system that transfers 300W dc power.