High-Bandwidth-Utilization Wireless Power and Information Transmission Based on DDPSK Modulation

Simultaneous wireless power and information transmission (WPIT) has attracted considerable attention in the area of wireless power transfer (WPT) technology. This paper proposes a high-bandwidth-utilization backward communication WPIT method based on dual-mode differential phase shift keying (DDPSK). By using semi-bridgeless active rectification (S-BAR) with dual-phase mode, the power and data transmission are integrated and controlled independently. Characteristics, including input impedance angle, output power, and efficiency, of the power transmission in the WPIT system, are modeled, and the features of the data channel and transient response are analyzed with different coupling coefficients and loads. The results show the information transmission operating robustly under various conditions without influencing power transmission. Meanwhile, the details about the design of the modulator and the demodulator of the WPIT system are carried out. Owing to the integrated data carrier into the power carrier with the same inductive link without modifying the circuit, the complexity and the cost are reduced significantly. A WPIT experimental prototype is established to verify this method, the data rate reaches up to 100 kb/s with 250-W power transmission, and the bandwidth utilization is as high as 1 bit/Hz.