Reverse Simultaneous Wireless Data / Power Transfer Method Based on OFDM

The stable operation of the wireless power transmission system is inseparable from the data transmission technology. In this paper, a new method based on Orthogonal Frequency Division Multiplexing (OFDM) technology is proposed to realize the reverse simultaneous transmission of data and power on account of the problems on coupling interference and low spectrum utilization in the shared channel transmission of data and power. The power carrier is equated as the data carrier loaded with all 1 information, data is decoupled synchronously and transmitted reliably at high speed by using OFDM technology and the crosstalk generated by the power transmission process to the data transmission process can be reduced in this method. In order to stabilize the output voltage when the load varies within a certain range, the Series LCC Circuit (S/LCC) compensation topology is adopted by the power transmission channel. As a shared channel for data and power transmission, loosely coupled transformer could simultaneously and reversely transmit two different frequency carriers of data and power. The structure of the system and the basic principle of OFDM are firstly introduced in this paper; Secondly, mathematical modeling of the system is carried out to analysis the transmission characteristics; and then the design methods of data modulation and demodulation are given; Finally, an experimental platform with 20 W power and 85 kbit/s data transmission has been built to verify the validation of the proposed method.