Research On Wireless Power Transfer Based On Magnetic Coupling Resonance

The magnetic resonance wireless energy transfer is a new field of Wireless Power Transfer technology,and it has become hot spot of the research because of its remote,high-power,high efficiency and penetration.At present,many scientists have done a lot of research on it,but there are still many key problems unsolved,for instance,power supply for mobile devices and electromagnetic shielding.Based on these problems,this paper studied the system,and the main research work is as follows:First,with the help of the coupled-mode theory and circuit theory,we analyzed the factors affecting system transmission performan ce,which is derived from a formula between the efficiency,power and the load voltage by establishing the mathematical model.Then,we simplified the parameters of circuit model of transmission system,derived the formula,ideally,load normalized receive voltage formula,and based on the formula,we draw variation curve of the load normalized receive voltage formula.According to the curve we knew the effective transfer area of magnetically coupled resonant wireless energy transmission and the necessary c ondition in frequency splitting.Through the MATLAB,we studied the 7 basic characteristics,the process of transmission(including transmission frequency and resonant frequency)characteristic,distance(axial distance and radial distance)characteristics,direction characteristics,harmonic characteristics,the characteri stics of the coupling coil,characteristics of primary and secondary coupling coil resonant state and load characteristic,in magnetically coupled resonant wireless energy transmission,and through these characteristics we can have a qualitative understan ding.Again,there is a detailed elaboration of the selection of main modular circuit and device in magnetic coupled resonant wireless power transmission,mainly include the selection and design of high frequency inverter circuit,the inverter control circuit,coupling coil topology road and the rectifying filter circuit,and determined the selection of devices and circuits required in this paper.Then,we built a set of magnetic coupled resonant wireless power transmission device to realize the wireless power transmission.When the system is equal to the resonant frequency and the transmission frequency of two coil axial transmission distance is 20 cm,the maximum output power is 80 W,the transmission efficiency is about 73%.At the same time,the system is used to the system is used to test the transmission characteristics of the system.Finally,on the basis of the work already done,we established a set of mobile car wireless power supply device,the axial distance between the emission device and receiving coil is 10 cm,the car can be smoothly supplied by this device in the 1m diameter circular run way ran wireless power supply,the entire system is stable and the transmission efficiency is about 61%.This technology will provide theoretical and technical support for wireless power supply of mobile devices.