A Three-Channel M-Ary Simultaneous Wireless Power and Data Transfer System

To improve the communication speed and reliability of the transmitter and receiver of the wireless power transfer system, this article proposes a three-channel M-ary frequency shift keying simultaneous wireless power and data transfer system (SWPDT). The SWPDT system adopts a high-frequency carrier series injection method to ensure the independence of the power channel and information channel. By utilizing the characteristic of high-order circuits with multiple resonant points, three information channels have been constructed, which can achieve serial and parallel data encoding to improve the transfer capacity and reliability of information channels. The transmission characteristics and mutual interference of power and information channels are analyzed and center frequencies of the three information channels are determined in this article. The results show that the center frequency of the information channels is almost not affected by the mutual inductance of the power coupler coils. Finally, a 1 kW SWPDT prototype with 1.8 Mbps half-duplex communication is presented to demonstrate the proposed system.