A Simultaneous Power and Data Transfer Method for Dynamic Wireless Charging Electric Vehicles
Xiaofei Li, Fan Zheng, Heshou Wang, Yue Sun, Xin Dai, Jiefeng Hu
Abstract
This article proposes a new method for simultaneous dynamic wireless power and data transfer (SDWPDT). When the receiver is moving, both power and data transfer channels are dynamically switched ON/OFF according to the receiver’s position. In essence, data are transmitted through the high-frequency electric field (EF) generated by the parasitic capacitances of the coupling coils and the metal shield plates, while power is transmitted through the relatively low-frequency magnetic field (MF) generated by coupling coils. By doing this, mutual interference between two transfer channels (i.e., power and data transfer channels) is relatively small. First, the interference from power to data can be greatly reduced due to the absence of a direct electrical wire-based connection. Second, the power loss caused by the data transfer channel in the power link is very small, so it can be ignored. In addition, the implementation of real-time communication facilitates the establishment of closed-loop control within the system. This mechanism guarantees consistent power output during dynamic movement, even in the presence of fluctuations in load or input voltage. Laboratory prototype-based experimental findings substantiate the feasibility of the proposed approach.