The closed-loop design of inverse Class-E power amplifier for wireless energy transmission system

This paper presents an optimal design methodology and a closed-loop control strategy for inverse Class-E power amplifier. An inverse Class-E power amplifier being utilized as the wireless energy transmitter makes the system more miniature and efficient. The load impedance is considered as a variable, and the inverse Class-E amplifier keeps operating in the optimal state when the load network changes by adjusting the duty cycle and frequency of the switching voltage. Corresponding closed-loop control circuits are designed with the process of SMIC 0.18μm 3.3V. Simulation results verify the closed-loop design and show that with a 20 % tolerance range of the output load network, the inverse Class-E amplifier can keep working in the optimal state.