Optimization And Research Of Transmission Efficiency Of Magnetically Coupled Resonant Wireless Power Transmission System

Wireless power transmission technology has given new impetus to the mode of transmission of electrical energy.Because the traditional wired transmission mode hidden wear,aging and other dangers,especially in the field of medical,underwater and mine,and wired transmission mode in other special occasions,therefore,there is an urgent need for people to study more convenient wireless transmission.Compared with the type of electromagnetic induction wireless power transmission technology,the magnetic coupled resonant wireless power transmission technology has the advantages of longer transmission distance and higher transmission efficiency,and quickly became a hot spot of research institutions at home and abroad in recent years.However,the realization of higher power,higher efficiency and longer distance radio transmission has reached the bottleneck of the rapid development of wireless power transmission technology.To solve this problem,firstly,this thesis introduces the development background of radio transmission technology,contrasts three kinds of advantages and disadvantages and the application fields of wireless power transmission mode,analyzes the research status of wireless power transmission technology at home and abroad.Secondly,this paper expounds the transmission mechanism of transmission system of the magnetic coupled resonant wireless power by using the coupled mode theory,additionally,a circuit model of magnetically coupled resonant wireless power transmission system is established by using circuit theory,and the current and system transmission efficiency and the load received power of each circuit in the circuit model are analyzed.Then,this paper analyzes the method of determining the resonant frequency of the magnetically coupled resonant wireless power transmission system and the frequency splitting phenomenon of the magnetically coupled resonant wireless power transmission system.The influence of frequency splitting on the transmission performance of the system is analyzed and the critical coupling state,the over coupling state and the under coupling state of the system are determined through the simulation calculation of the scattering parameters of the resonator,and a frequency matching strategy based on system power optimization and system efficiency optimization is proposed respectively.Then,the influence of resonator quality factor,coupling coefficient,space position and composite structure of resonant coil on the system efficiency is analyzed,and the transmission distance of the load to obtain the maximum power is determined.Furthermore,a load matching strategy based on system power optimization and system efficiency optimization is proposed respectively.Finally,the experimental prototype is built on the above a series of strategies of power optimization and efficiency optimization system based on verified,and the design of the low power wireless supplied track trolley achieve the purpose of the car power supply during driving.This paper provides theoretical support for the optimization of transmission power and system efficiency of magnetically coupled resonant wireless power transmission systems.