基于电场耦合的电能信号并行传输系统串扰抑制方法

Crosstalk Suppression Method for Electric-Field Coupled Power and Signal Parallel Transmission System

针对较大功率电场耦合无线电能传输系统信号双向高速传输的需求,该文提出一种基于部分能量通道的电能与信号并行传输系统的串扰抑制方法。通过对所提出的系统拓扑进行分析,给出了电能传输增益表达式与电能串扰增益表达式,并分析了阻波电路参数变化对电能串扰增益的影响;基于交流阻抗法及香农定理分别给出了信号传输增益及信道容量表达式,分析了信号支路参数对信道容量的影响;在综合考虑信号传输增益、信道容量及阻波电路参数敏感性的情况下,给出系统信号支路参数的设计方法。该方法能保证系统在较大功率下降低电能串扰,保障信号稳定传输,实现信号的双向高速传输。通过仿真与实验验证了所提出的拓扑和参数设计方法的有效性。搭建的实验装置实现了传输530.4 W的电能,23.28 Mbit/s信号正向传输速度和24.2428 Mbit/s信号反向传输速度。

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.