Research On Key Technology Of Magnetic Charging Resonant Electric Vehicle Wireless Charging System

Magnetic coupling resonant electric vehicle wireless charging technology transfer energy byh the resonance technology,and energy transmission medium is the electromagnetic field.This technology is a new technology which has been researched in recent years.Compared to other wired transmissions,electric vehicle wireless charging technology does not require wire connection,and can avoid security risks caused by exposure,wear and rain leakage.Magnetic coupling resonant electric vehicle wireless charging technology have many advantages,for example,good transmission performance,strong penetrating power,small radiation and high safety factor.In addition,the magnetic coupling resonant type can also be used in some harsh environments,for example underwater,desert and so on.Therefore,the magnetic coupling resonant electric vehicle wireless charging technology has attracted the attention of domestic and foreign research institutions,and has gradually become one of the electric vehicle wireless charging technology research hotspots.This paper descripts the magnetic coupling resonant wireless energy transmission technology’ theoretical basis,introduces the structure of the wireless charging system and explains its energy transfer mechanism in detail.The system equivalent circuit model is constructed,and the theory of circuit mutual inductance is deduced.In the end,obtain the expression of output power and output efficiency of magnetic coupling resonant electric vehicle wireless charging technology.On the basis of theoretical analysis,this paper designs the driving circuit and the receiving circuit of the magnetic coupling resonant electric vehicle wireless charging system.The circuit of the experimental device is tested and actual output power and output efficiency are obtained.The experimental device can complete the experimental requirements.According to the expression of the system output power and output efficiency,we can concluds: the system output power and output efficiency are related to mutual inductance M,frequency f,quality factor Q,load R and so on.According to the formula,the effect of each factor on the transmission performance of the system is simulated by MATLAB software,and the results are compared with the experimental results.It can be found that the two results are almost same.Finally,it is proved that the parameter optimization method of the system is feasible.