Research on An Anti-Offset Wireless Power Transfer System With Auxiliary Resonant Circuit

Aiming at the issue of unstable output voltage and rapid efficiency degradation caused by coil offset during the wireless power transfer (WPT) process, an anti-offset WPT system with auxiliary resonant circuit is presented. The WPT system employs the high- order compensation network and an auxiliary resonant circuit composed of an auxiliary coupling coil and a resonant capacitor. The coupler of the system adopts the traditional four-coil BP coupler. By adjusting the resonant inductance value of the LCC network, the magnetic coupler can accommodate different scenarios with varying equivalent mutual inductance (MI) fluctuation requirements. Finally, a 1-kW prototype was developed to validate the strong anti-offset characteristics of the proposed WPT system.