基于电场耦合的电能信号并行传输系统串扰抑制方法

doi:10.19595/j.cnki.1000-6753.tces.230058

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Abstract

In practical engineering application scenarios, in order to achieve better power transmission effect, achieve closed-loop control and improve system robustness and system efficiency, the Electric-field Coupled Wireless Power Transfer (EC-WPT) system requires real-time communication between the power transmitter and the load receiver. In addition, in some applications, the power transmitter needs to transmit some information such as control instructions to the power receiver, and the power receiver also needs to transmit a large amount of data to the power transmitter, such as underwater robots, drones and other wireless power supply systems. At present, many scholars have carried out research on the parallel transmission of electric energy and signal in EC-WPT system and put forward some solutions. However, there are few studies on the bidirectional high-speed transmission of signals in EC-WPT system with large power transmission.
This paper proposes a crosstalk suppression method with LC resistance wave circuit for parallel transmission system of electric energy and signal. Based on the AC impedance analysis method, the expressions of power transmission gain, power crosstalk gain and signal transmission gain are given. By analyzing the power transmission model and the power crosstalk model, the parallel LC resistance wave circuit is proposed to isolate the crosstalk of the energy to the signal, and the influence of the parameter change of the resistance wave circuit on the power crosstalk gain is analyzed. According to the expression of power crosstalk gain and signal transmission gain, the channel capacity model is established by using Shannon theorem, and the influence of signal branch parameters on channel capacity is analyzed. A channel parameter design method considering signal transmission gain, channel capacity and the sensitivity of LC resistance wave circuit parameters is proposed.
The simulation model is established based on the Matlab simulation platform. The simulation results show that the proposed method can effectively reduce the power crosstalk under large power transmission, ensure stable signal transmission, and realize bidirectional high-speed signal transmission. Finally, the experimental prototype is built. When the output power reaches 530.4W, the power transmission efficiency reaches 85.54 %, the signal forward transmission speed reaches 23.28Mbps and the signal reverse transmission speed reaches 24.24Mbit/s. The power crosstalk gain G_ps1 is 1.5 %, G_ps2 is 0.54 %, and the power crosstalk is well suppressed. When there is no signal transmission circuit, the power transmission efficiency is about 87.69 %, and when there is signal transmission circuit and signal transmission, the power transmission efficiency is about 85.54 %, which indicates that there is little effect of signal transmission 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 proposed in the current literature, the crosstalk suppression method proposed in this paper can effectively suppress the power crosstalk when the power transmission is large, and realize the bidirectional high-speed stable transmission of the signal. It can also effectively suppress the crosstalk of signal transmission to power transmission and ensure the reliable transmission of power.

Key words： Electric-field coupled wireless power transfer signal bidirectional transmission power crosstalk parameter design

Received: 13 January 2023

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TM724

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	Su Yugang
	Deng Chenlin
	Hu Hongsheng
	Sun Yue
	Li Yumeng
	Deng Renwei

Cite this article:

Su Yugang,Deng Chenlin,Hu Hongsheng等. Crosstalk Suppression Method for Electric-Field Coupled Power and Signal Parallel Transmission System[J]. Transactions of China Electrotechnical Society, 0, (): 9010-10.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.230058 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/9010

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