A Cost-Effective Simultaneous Wireless Power and Data Transfer System With High-Rate Half-Duplex Communication

In simultaneous wireless power and data transfer (SWPDT) systems, which adopt coupling coils with taps, the selection of the tap position to obtain good performance of communication is a major problem. To solve the problem, this paper proposes a novel SWPDT system based on tapped coils with ferrite cores. The proposed system is cost-effective while achieving high-rate half-duplex communication and improving power transfer efficiency (PTE). In the proposed system, additional wave trappers and coupling coils are not needed, reducing the costs and size of the system. A double-sided LLCC compensation topology is employed to filter most of the highorder harmonics generated by the H-bridge inverter and rectifier, while suppressing common-mode (CM) current. Zero-voltage switching (ZVS) is considered in the compensation design to suppress electromagnetic interference (EMI). Amplitude-shift keying (ASK) technology, which is low-cost and easy to implement, is used for modulation. Additionally, this paper presents a comprehensive parameter design method by analyzing the data transmission gain and power interference. Finally, an experimental prototype was constructed to validate the proposed system. The prototype successfully achieved an output power of 545 W with a maximum PTE of 95.55% and a maximum data rate of 1.25 Mb/s.