| Non-contact power transmission is a new and innovative technology in the field of power transmission,which has become a hot spot in the field of modern power transmission.It has got rid of the restraint that must be connected by wire in the traditional way,extends the range of the electrical equipment's activities and avoids the safety problems caused by wire aging and electric spark.However,only the non-contact power transmission can not to meet the current requirements of the information age.In most applications,hybrid transmission of power and signal is often required,such as oil drilling,implantable medical devices,rotating joints of robots and the like,to provide power for the electrical equipment,at the same time,complete the signal feedback and control.Aiming at the problem of full-duplex signal transmission in the process of power transmission,a hybrid transmission system of non-contact power and signal is studied and designed in this thesis.The main work of this thesis is as follows:1.The scheme design and principle derivation of full-duplex signal transmission in non-contact power transmission system.Based on the structure of the inductively coupled power transmission system,a AM modulation scheme of changing the input voltage amplitude by the gating switch to forward the signal and adjusting the secondary compensation capacitor to change the system resonant voltage to reverse signal transmission is proposed,realize full-duplex signal transmission during power transmission.Four basic compensation structures are introduced in this thesis.The characteristics of the SP compensation structure are analyzed.Establish a mutual inductance model for the system loop,column write loop equation,analysis system impedance.The principle of full-duplex transmission of this scheme is discussed in detail.2.Construction of joint simulation system.The finite element simulation software Maxwell is used to model and simulate the barrel-type loose coupling transformer,the improvement is made to reduce the leakage flux and the coupling coefficient is increased from 0.507 to 0.572.Use simplorer to build a system-level simulation of the transmission scheme,the Maxwell transformer model is imported,the simulation circuit is controlled by Simulink,so as to achieve the joint simulation of the three.The simulation result is analyzed to verify the feasibility of the transmission scheme.3.System hardware circuit design and controller settings.According to the proposed architecture of full-duplex transmission of signal in inductive coupling system,device selection and schematic design of modulation power supply,modulation signal driver circuit,full-bridge driver circuit,power supply circuit and signal demodulation circuit are respectively carried out.Draw the circuit board and debug the circuit parameters.The controller module chooses STM32,carries on the debugging under Keil MDK development environment,drives the full-bridge circuit and the signal modulation circuit.Set up the system circuit platform,measure the relevant experimental waveforms and verify the experimental results,which are in good agreement with the theoretical analysis and simulation results.The full-duplex transmission of signals during power transmission is realized,and the error rate can reach less than 2/10000 when the signal transmission rate is 400 bps. |
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