| At present,wireless power transmission technology is a hot research topic.There are various transfer forms for WPT including laser,microwaves,electromagnetic induction and electromagnetic resonance.The transmission distance of WPT range from millimeter to kilometer,and the frequency range from thousands of k Hz class to a few GHz.It has a wide application prospect in transportation,human body area network,consumer electronics,space station,electric vehicle and some specific application.In this paper,the MCR-WPT system and its load characteristics are analyzed in detail.The effect of load parameters,which is on the performance of the system is analyzed.And the resonances of multi-load coils are studied.The results provide a theoretical basis for solving the problem of maximum energy efficiency and load-side reliability when the load changes in the real environment.Guidance and experimental basis,the specific research content is as follows:Firstly,the principle of energy transfer in non-destructive oscillation system is described based on the coupled-mode theory,and the energy transfer process in resonant wireless power transmission system is analyzed.Based on the principle of the circuit,the transmission model of the two-coil structure and the four-coil structure are established.The influence of the coil quality factor and frequency and coupling coefficient on the system transmission characteristics are studied.Secondly,based on the equivalent circuit principle,the paper analyzes the load condition of the maximum transmission efficiency of the wireless energy transmission system.In the case of two-coil and four-coil structure,when the load is pure resistive,capacitive and inductive,influence of Parameter Variation on System Transmission is researched.The capacitive and inductive are used to increase the transmission efficiency.The coil model is designed and constructed,and the experimental platform is set up.The experimental results verify the correctness of the theoretical deduction.Finally,The effect of load switching on the transmission efficiency and output voltage of the system is studied in the case of tight coupling and loosely coupling basing on the principle of the circuit analysis of the multi-load transmission characteristics.By adjusting the supply voltage to meet the load on the output voltage and power requirements.The electromagnetic field finite element software Maxwell and the multi-physics simulation software The software of Simplorer is used to simulate the coupling field.The simulation results is verified by simulation.The multi-load coil model is built and the experiment platform was established. |
PDF Full Text Request