Research And Design Of Electromagnetic Resonant Wireless Power Transmission System

Wireless power transmission(WPT)technology is an emerging power supply technology.It is an effective method to solve the power access problem in some special environments.Compared with traditional power transmission methods,it is safe,reliable,and flexible.At present,electromagnetic resonance WPT technology is the mainstream of research on WPT technology.It has the characteristics of long transmission distance,high transmission efficiency,little harm to the environment and human body,and it has been rapidly developed and applied in many fields.Based on the enormous application value of WPT,this subject has conducted theoretical and experimental research on electromagnetic resonant WPT technology.First,the mathematical modelling of the WPT system is performed using coupled mode theory and circuit theory.The preconditions for the realization of the energy-maximizing transmission of the WPT system are summarized through the coupled mode theory.The mathematical expressions of the output power and the transmission efficiency of the system are derived using the circuit theory,and the theory and working mechanism of the electromagnetic resonance WPT technology are deeply studied.Secondly,using MATLAB to simulate the analysis of the frequency performance,distance performance,directional performance,load performance,resonance coil parameter performance and other performance of the impact of power transmission performance.On this basis,the phenomenon of frequency splitting is studied,and the research idea of suppressing frequency splitting by rotating the receiving coil to improve transmission efficiency is proposed.Then,the various types of circuits and devices in the electromagnetic resonant WPT system were selected,and the design of the overall hardware circuit was completed,mainly including the high frequency inverter circuit,the resonant coupling circuit,the rectifier voltage regulator circuit,and the simulation was performed using SABER software,verify the correctness of circuit design.Finally,an experimental platform was set up to use mobile phone charging as an application background.Experimental analysis was performed on the designed WPT device.The resonant frequency of the system designed in this thesis is 1.2MHZ,the coil diameter is 10cm,the WPT distance can reach 15cm,and the function of using the electromagnetic resonant WPT device to charge the mobile device is realized.