A Constant-Voltage and Constant-Current Capacitive Power Transfer System Based on Transmitter’s Parameter Prediction

To address the issues of high latency and poor reliability caused by the reliance on wireless communication feedback in traditional capacitive power transfer (CPT) systems, this paper proposes a prediction algorithm for the output voltage and current of the receiver based on the electrical parameters of the transmitter. This algorithm can accurately estimate the output state of the receiver using only real-time measurement information from the transmitter. Based on this prediction result, an autonomous constant-voltage (CV) and constant-current (CC) control strategy without feedback from the receiver is further implemented. An experimental prototype is constructed, and constant output voltage of 25.2V and constant output current of 2A are achieved at different transfer distances, with the maximum efficiency 91.4%. This verifies the accuracy of the proposed prediction algorithm and the feasibility and effectiveness of the proposed CV and CC control strategy.