Design of A Wireless Power Transfer System for Constant Output Voltage Against Misalignment

In this paper, an LCC-S compensated wireless power transfer (WPT) system based on DC-link voltage control and variable inductor control is proposed to achieve output voltage regulation and high-power transfer efficiency against the mutual and self-inductance variation of coupled coils. On the transmitter side, the PFC rectifier is used to achieve output voltage regulation. On the receiver side, the variable inductor is used to achieve self-inductance compensation. With the presented control method, both output voltage regulation and zero voltage switching (ZVS) condition of high frequency inverter can be achieved. In order to verify the proposed WPT system, a 2 kW simulation study has been carried out under different coupling conditions.