Research on Simultaneous Wireless Power and Full-Duplex Data Transfer Using Multiple Coupled Coils

Magnetic-field coupled wireless power transfer (MC-WPT) systems require reliable power delivery as well as real-time bidirectional data communication. To satisfy this requirement, a simultaneous wireless power and full-duplex data transfer (SWPFDT) system based on a three-coupled bilateral LCC topology is proposed in this paper. In the proposed structure, the power coil, backward-signal coil, and forward-signal coil are implemented as a solenoid-type monopole coil, a solenoid-type bipolar coil, and a DD (double-D) coil, respectively. By utilizing the orthogonal relationship among the magnetic-field distributions of different coils, the desired coupling within each channel and mutual decoupling among the three coil sets are achieved, thereby structurally reducing inter-channel crosstalk. Based on this configuration, an equivalent circuit model of the system is established, through which the constant-current output characteristics, forward and backward signal transmission gains, signal crosstalk, and power-to-signal interference are analytically derived. In addition, the resonant parameters and wave-trapping networks are designed accordingly. A laboratory prototype is developed for experimental verification. Experimental results show that the proposed system can achieve 150 W power transfer with an efficiency of 88.7%. With a 19.2 kbps communication rate, the system can stably realize full-duplex data transmission with limited interference between the forward and backward channels, while maintaining constant-current output and reliable communication under dynamic load switching.