High Speed Signal Transmission Technology Based on Partial Power Channel for Capacitive Power Transfer System

In order to increase the signal transmission speed and reduce the interference between power transmission and signal transmission in Capacitive Power Transfer (CPT) system, this paper proposes a high-speed signal transmission method based on partial power channel by using orthogonal frequency division multiplexing (OFDM) modulation and demodulation technology. The circuit model of the system is established, and mathematical expressions of power interference voltage and signal voltage are deduced. The parameter design method of the CPT system is presented to reduce the interference and improve the speed of signal transmission without reducing power transmission capacity. The system experimental setup achieves signal transmission speed of 80Mbps with little interference to power transmission, which verifies the validity of the proposed method.