Research On Full-Duplex Signal Transmission Of MC-WPT System Based On Carrier Modulation

Magnetic Coupling Wireless Power Transfer(MC-WPT)technology is a research focus in Wireless Power Transfer(WPT)technology.It realizes wireless transmission of power from the primary side to the secondary side with the principle of magnetic resonance.With the deepening of research on MC-WPT technology and the requirement on the improvement of power transfer quality,the communication between primary side and secondary side is necessary.Especially,the full duplex signal transmission of the primary and secondary sides is necessary in some applications,which puts higher requirements on the communication of the MC-WPT system.In this paper,the full-duplex communication of parallel transmission of power and signal by sharing channel has been studied in MC-WPT system.Based on typical MCWPT structure,a novel topology is proposed for full-duplex communication on the condition of little influence on power transmission performance.The power transmission channel structure is the same as the typical MC-WPT system.And the magnetic coupler of power transfer is used as the signal magnetic coupler to consist the signal transmission channel.Signal transmission channels are built and signal resonance compensation networks are designed.The inherent structure of the system(the partial power resonance networks and signal circuit compensation networks)is used to achieve the function of wave trappers,and avoids the interaction between the power and signal transmission networks without additional wave trapper circuits.Under the condition of that,the mutual influence of power and signal transmission can be ignored.The power and signal transmission networks can be simplified into two independent systems,which greatly simplifies the complexity of system analysis.And the transmission gain expressions of power and signal are obtained by the simplified model.The double resonance point mathematical model of signal circuit topology is obtained by modeling the signal circuit topology.Then full-duplex communication is achieved by the using different signal carrier frequencies.The mathematical models of high-order complex circuit can be got by using Laplace transform.And then,the dynamic response in the time domain is obtained to realize the analysis of dynamic process during the signal switching process.So,the baud rate of signal is obtained.The interference expressions of signal forward and reverse transmission is got by analyzing the interference caused by power transfer and Inter-channels.And then the signal-to-noise ratio(SNR)is obtained.A parameter design method based on the premise of stable transmission of power and signal is proposed to optimize the performance of signal transmission.The correctness of the theoretical analysis is verified by simulation on the platform of MATLAB/Simulink.On this basis,an experimental platform is built according to the simulation parameters,and the practicability of the proposed method is verified.Finally,without obviously affecting the performance of power transfer,the parallel transmission of power and signal and the full-duplex communication are completed.