In this paper, the anti-offset performance and output characteristics of the interdigital electrode coupler for capacitive power transfer (CPT) system are optimized.  Interdigital electrode coupler is composed of four crossed plates. When the position of receiver changes, relay switch array is used to change interdigital electrode coupler structure in real time. To optimize output transfer efficiency and decrease output voltage stress of electronic component, two common topologies of series and double-sided LC are analyzed in detail. Compared with series topology, doble-sided LC topology has the characteristic of soft swich, which significantly decrease switch loss of inverter. In addition to this, doble-sided LC takes advantage of low output voltage stress, which is significant to production and design of electronic components at receiver side. Theory and simulation results show agreement with each other.

CPT;Interdigital electrode coupler;Series and doble-sided LC topology;Voltage stress;Anti-offset;Soft switch