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| Crosstalk Suppression Method for Electric-Field Coupled Power and Signal Parallel Transmission System |
| Su Yugang1,2, Deng Chenlin1, Hu Hongsheng1,2, Sun Yue1,2, Li Yumeng1, Deng Renwei1 |
1. School of Automation Chongqing University Chongqing 400043 China;
2. China National Center for International Research on Wireless Power Transfer Technology Chongqing 400043 China |
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Abstract In practical engineering applications, Electric-field Coupled Wireless Power Transfer (EC-WPT) systems require real-time communication between the power transmitter and the load receiver to achieve better power transmission effect, enable closed-loop control, and enhance system robustness and efficiency. In certain applications, the power transmitter needs to transmit control instructions to the power receiver, while the power receiver needs to transmit a large amount of data back to the power transmitter, such as underwater robots and drones. Although numerous studies have explored the parallel transmission of electric energy and signals in EC-WPT systems, there are few studies on bidirectional high-speed signal transmission in EC-WPT systems with large power transmissions.
This paper proposes a crosstalk suppression method with an LC resistance wave circuit for parallel electric energy transmission systems. Based on the AC impedance analysis method, expressions for power transmission gain, power crosstalk gain, and signal transmission gain are given. The parallel LC resistance wave circuit is proposed to isolate energy crosstalk to signals by analyzing the power transmission model and the power crosstalk model. The influence of resistance wave circuit parameters on power crosstalk gain is analyzed. According to expressions of power crosstalk gain and signal transmission gain, the channel capacity model is established using the Shannon theorem, and the influence of signal branch parameters on channel capacity is analyzed. A channel parameter design method is proposed considering signal transmission gain, channel capacity, and the sensitivity of LC resistance wave circuit parameters.
The simulation model is established using the Matlab simulation platform. The results show that the proposed method can effectively reduce the power crosstalk during large power transmissions, ensuring stable signal transmission and realizing bidirectional high-speed signal transmission. Finally, an experimental prototype is built. At an output power of 530.4 W, the power transmission efficiency reaches 85.54%, with a forward signal transmission speed of 23.28 Mbit/s and a reverse signal transmission speed of 24.24 Mbit/s. The power crosstalk gain Gps1 is 1.5%, Gps2 is 0.54%, indicating successful suppression of power crosstalk. Power transmission efficiency is about 87.69% and 85.43% without and with signal transmission circuit and signal transmission, respectively, indicating minimal effect on power transmission. Simulation and experiment verify the effectiveness and correctness of the proposed method.
Compared with the EC-WPT energy signal parallel transmission system, the proposed method can effectively suppress the power crosstalk during significant power transmission, realizingbidirectional high-speed stable transmission of signals. It can also effectively suppress the crosstalk of signal transmission to power transmission and ensure reliable power transmission.
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Received: 13 January 2023
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2024, Vol. 39 
