A magnetic coupled resonance WPT system design method of double-end impedance converter networks with Class-E amplifier

Magnetic coupled resonance Wireless Power Transfer (MCR-WPT) system has many advantages in mid-range power transfer applications. Class-E amplifier is a suitable high frequency power source for MCR-WPT system because it has merits of simple circuit structure and high conversion efficiency. However, the power transfer efficiency drops rapidly and class-E amplifier works in bad conditions because the load and transfer distance always change in practical applications. In order to solve this problem, a method adopted L-type double-end impedance converter networks to MCR-WPT system has been proposed in this paper. This method can make the system transfer efficiency higher and keep class-E amplifier working in ZVS and ZDS conditions simultaneously. Finally, simulation results verified the effectiveness of this double-end impedance converter networks.