A Splitting Frequencies-Based Wireless Power and Information Simultaneous Transfer Method

A splitting frequencies-based wireless power and information simultaneous transfer (SF-WPIT) method is proposed, and its power and information transfer performances are investigated theoretically and experimentally. First, the power and information transfer characteristics, including transmitting power, power efficiency, frequency bandwidth, and effective operating range, are investigated theoretically on the splitting frequencies of strongly coupled region in symmetric series-series resonant inductive link. The investigation result shows that the splitting frequencies have a good potential of realizing a high-performance power and information transfer. Second, the SF-WPIT system is configured and the factors that influence on the performance of this system are investigated theoretically. A method of tracing two splitting frequencies is presented. A response time calculation method of splitting frequencies is presented, and the influence of response times on the performance of the SF-WPIT system is clarified. Finally, an experimental prototype is constructed with a pair of planar coils of 75-mm mean radius, and the proposed theory and system performance are verified by experimental results. This prototype exhibits a 15 kb/s of data rate and a stable power transfer irrespective of distance change in its operating range of 0-120 mm.