LAUSR

Communication between the primary and secondary sides is of critical significance in wireless power transfer (WPT) systems. In this brief, a novel cost-effective implementation of independent data and power transmission channels is proposed. Based on the typical WPT systems structure, the capacitance between metal shield plates provides naturally an independent capacitive channel for data transmission. Considering the parasitic capacitance between coil and plate, a concentric design for metal plate division is used to form a six-plate capacitive coupling mechanism with symmetrical misalignment tolerance ability, and meanwhile, the magnetic shielding function of the metal plate is maintained. Furthermore, there is no direct line connection between power and data transmission channels, and the parasitic capacitances between coil and plate sections on the same side are almost equal, resulting in virtually no interference between the power and data transmission. Compared with conventional simultaneous power and data transmission methods, additional wave trappers and coupling structures are not needed, which significantly reduces the overall cost and size of WPT systems. Finally, a 50W experimental prototype, with closed-loop output voltage control using 9600bps data transfer rate, validates the feasibility of the proposed method.