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In this article, an underwater simultaneous wireless power and data transfer (SWPDT) system with 1-Mbps full-duplex communication link is proposed. The communication channel shares the coupler with the power channel without using additional communication coils. The transducers inject and extract high-frequency data carriers through the taps of the coupling coils to send and receive data. The proposed method for constructing a full-duplex communication channel no longer pursues the resonant relationship between inductance and capacitance. It takes advantage of the inherent characteristics of the higher-order circuit to simplify the circuit structure and maintain a high degree of design freedom. In addition, the center frequencies of the two communication channels do not shift with the change in the transmission distance, realizing the capability of misalignment tolerance. To improve the utilization efficiency of the communication frequency bands and achieve a high data rate, the system uses the minimum shift keying (MSK) modulation and coherent demodulation implemented by Xilinx Zynq-7000 FPGA. A 1-kW underwater SWPDT prototype with 1-Mbps full-duplex communication is presented to demonstrate the proposed system.

This letter proposes an undersea simultaneous wireless power and data transfer (SWPDT) system with extended communication distance and 1-Mb/s full-duplex communication. The proposed system operates in inductive power transfer-electric field communication mode, thus reducing the crosstalk between the power channel and communication channel. This letter proposes a novel communication channel construction method based on the single capacitor coupling principle, which can effectively extend the communication distance without additional mechanisms. The extended communication distance enables precommunication before charging and maintaining communication after completing charging, which is critical for undersea dynamic equipment. The resonant condition and transmission characteristics of the communication channel are analyzed. Two MHz communication bands are constructed to achieve full-duplex communication based on frequency division duplexing. Finally, the proposed undersea SWPDT prototype has a maximum output power of 1.2 kW and can maintain 1-Mb/s full-duplex communication within a range of 50 cm.

An LC filter rectifier with a diode bridge is widely used in an inductive power transfer (IPT) system. However, when the load resistance reduces, the rectifier input impedance becomes capacitive. In addition, the filtered inductor is not infinite, and its harmonic currents cause the input impedance to be biased inductively. In order to solve the above two problems, a novel LC filter rectifier is proposed in this article, which achieves zero input impedance angle of the rectifier. First, the mechanism of the traditional LC rectifier filter is analyzed in detail, and an accurate circuit model is proposed. Then, an improved LC filter rectifier is analyzed and designed, and the input impedance angle of the rectifier is zero. Finally, a prototype with the load of 8–120 Ω is built, which verified the correctness and feasibility of the improved rectifier. Compared with the traditional rectifier, the efficiency of the IPT system with an improved rectifier is increased by 1.10%, and the output voltage fluctuation is smaller.