A Simultaneous Power and Downlink Data Transfer System With Pulse Phase Modulation

This brief presents a pulse phase modulation scheme for simultaneous wireless power and downlink data transfer system through the same inductive link. It is proved that the impact of data transfer on power transfer can be minimized when using the proposed pulse phase modulation. A prototype is built up with 1-MHz resonant frequency for power transfer. It shows that the data can be successfully transferred while achieving a data rate of 125 kb/s, which is 1/8 of carrier frequency, and a bit error rate (BER) of 4.5×10-6. Furthermore, compared with the case without data transfer, the input powers and the output powers are almost unchanged, respectively.