基于自激逆变器的无线电能传输系统

To decrease the complexity of the wireless power transfer (WPT) system, a novel self-excited inverter was proposed to design the AC power source. The self-excited inverter could realize the self-drive and soft-switching of the MOSFETs as well as the frequency tracking function without PWM generator and digital signal processor, which greatly simplified the structure of the AC source. In a WPT system, the series LC transmitter would exhibit a series resonant short circuit with a mutual inductance of M=0. Thus, the parallel-series (PS) topology was utilized and the constant voltage (CV) output characteristic of WPT system could be achieved. The working principles of the PS WPT system and the self-excited inverter were provided. The simulation results verified the self-excited inverter and the constant voltage output characteristic of the PS WPT system. The experimental results show that when the transmission distance is 7cm and the load resistor changes by 200%, the output voltage only fluctuates by 2.6%, which indicates that the output voltage of the PS WPT system is robust to load changes.