Research On Magnetic Coupling Resonant Wireless Power Supply System

Magnetic coupling resonant wireless power supply technology is a kind of advanced contactless power supply technology,which not only overcomes the limitation of the transmission of the wired power,but also overcomes the inherent shortcomings of the inductive and radiation wireless electrical energy transmission,which has become a hot research topic.The magnetic coupling resonant wireless power supply system mainly depends on the magnetic coupling between the coils to transmit power.The transmission process does not involve any wire connection,so it can be very good to avoid the interference of external environmental factors.Compared with other transmission methods,it has the obvious superiority in the transmission characteristic,and can well realize the promotion and the application of wireless power supply technology.In this paper,the basic principle and transmission characteristics of the magnetically coupled resonant wireless power supply system are studied.Based on the basic principle,the four basic topologies of the magnetic coupling resonance wireless power supply system are established.The system transmission efficiency under the four basic structures is analyzed theoretically.At the same time,the effects of coupling coefficient,loss coefficient,quality factor,frequency on the transmission characteristics are analyzed.The relationship between the parameters is simulated by MATLAB simulation software,and the relationship between the parameters and the transmission efficiency is obtained.Through the study of these characteristics,the coupling mode analysis of the magnetic coupling resonance power supply system with the relay coil is given.In theory,adding relay coil can effectively improve the transmission distance and transmission efficiency of the system,and improve the transmission characteristics of the system.According to the analysis and research,the components and modules of the system design requirements is determined,and then the system hardware is built.Then the output voltage of each module of the hardware circuit before and after adding the relay coil,the transmission efficiency and the distance between the coils are tested.Finally,the test results prove the feasibility of the design system and the increase of transmission distance and transmission efficiency by adding the relay coil.