Vertical Self-coupling Plates Design for Capacitive Power Transfer System

Capacitive power transfer (CPT) technology has become a research hotspot of wireless power transfer technology by the advantages of its low cost, lightweight, and no eddy current loss. In CPT systems, the port capacitance in parallel with the coupling capacitance contributes significantly to the reduction of system component voltage stresses and system inductance volume. However, the existing coupling mechanism suffers from small equivalent port capacitance values, low utilization of the coupling area of the port capacitance to the plate, and inability to be adjusted accurately, which constrains the development of CPT systems. In this paper, a vertical self-coupling mechanism is proposed, which improves the utilization of port capacitance to the coupling plate. Without external capacitors, it can generate a larger port capacitance by relying on its own structure and has a certain degree of adjustability, which provides a new solution to improve the value of port capacitance, and thus reduce the value of the system inductance and the voltage stress on the components.