Analysis and control of capacitive-coupled wireless power transmission system

Electric field-coupled wireless power transmission utilizes the electric field applied between the physically separated metal plates. In this application, how to provide the regulated output voltage through the resonant LC link are challenging task. In this paper, analysis and control design of such system are investigated. Following small signal and high Q approximation, transfer function of the overall power stage including the transmitter and receiver circuit is extracted and the control loop is designed in the frequency domain. The theoretical results are verified by PSIM simulation for a 10V/0.5A prototype system.