| Magnetic Coupling Wireless Power Transfer(MC-WPT)technology is based on the principle of electromagnetic induction,which uses magnetic coupling mechanism to transmit high-frequency magnetic field instead of traditional cable as transmission mode to realize the wireless transmission of energy.It has the advantages of flexible and simple use.It has been widely studied and applied in electric vehicles,industrial robots,biomedical devices,consumer electronics and other fields at home and abroad.With the in-depth research and application of MC-WPT technology,combined with the trend of the Internet of things(IOT)and 5G technology,the research on the communication method of the primary and secondary sides of the magnetic coupling mechanism of MC-WPT system has an urgent demand,which has become another important research direction in this fieldThis paper takes LCL-S type MC-WPT system as the research object and application equipment.Considering the demand of high-speed communication of multi-channel and multi frequency signals on the primary and secondary sides of the system,a communication solution based on parallel transmission,multi-channel filtering and independent DD coil antenna with the same physical position of power coupling mechanism is proposed,and the design method of circuit parameters and structure and modeling and simulation results of DD coil are given.The results show the feasibility of the scheme.For the high-speed and stable communication requirements of multi-channel signals,this paper introduces the existing energy signal synchronous transmission technology of MC-WPT system and the corresponding signal modulation technology,analyzes the advantages and disadvantages of the existing scheme,and then combines the existing technology,uses amplitude modulation(AM)technology modulates the analog signal,and at the same time,QAM(Quadrature Amplitude Modulation)and OFDM(Orthogonal Frequency Division Multiplexing)technology realize high-speed digital communication,and realize the generation of multi-channel multi frequency signal.For the transmission requirements of multi-channel and multi frequency signals,how to couple the multi-channel and multi frequency signal to the transmission circuit and separate and extract each signal is the focus of research.In this paper,the signal circuit is divided into two circuits: transmitting and receiving.Firstly,the parallel circuit is used to transmit multiple signals,then the filter circuit of each signal is designed by transformation method of the constant K-type filter model,and the mixed multi-channel multi frequency signal is separated by using the frequency characteristics of each filter.Finally,the three winding transformer is used to combine the receiving and transmitting circuits to improve the system integration.According to the design requirements of the coupling transceiver of multi frequency signals,considering the interference of energy and magnetic field in the communication environment,this paper adopts DD coil and filter to suppress and filter the noise.In this paper,COMSOL finite element simulation software is used to model DD coil,and then the electromagnetic wave physical field tool is used to analyze the radio frequency of DD coil.The coil impedance,S parameter,anti offset performance and radiation pattern of the designed DD coil in the working frequency band are obtained,and the design scheme of DD coil that meets the requirements could be obtained,which shows the effectiveness of the designed coil structure.Combined with theoretical research and simulation analysis,this paper firstly builds a comprehensive simulation model based on the proposed scheme to verify the effectiveness of the scheme.Then the system experiment platform is built to carry out the energy and signal synchronous transmission experiment.The result shows that the communication rate could reach 5.88MB/s under the power condition of 3.75 kw,which verifies the feasibility of this scheme. |
PDF Full Text Request