Study on load adaptation of capacitive power transfer system with a four-plate compact capacitive coupler

This paper proposes an LCL-L compensated capacitive power transfer (CPT) system with a four-plate compact capacitive coupler to achieve load adaptation. The coupling principle of four plates is explained, and the formulas between the cross-coupling capacitances and port capacitances are deduced by establishing a two-port capacitive network model of the coupler. The resonant frequency is designed to be unchanged whether the pick-up is removed or moved back to simplify system control. The model of the coupler and AC impedance model of CPT system are established, and the parameter design method is given. Finally, the feasibility and effectiveness of the proposed topology and its parameter design method are verified by simulation and experimental results.