Research On Wireless Charging Technology Of Electric Vehicle

With the increasing proportion of environmental economy in the total economic volume year by year,green industry is expected to play a decisive role in the future development.As a new energy industry,electric vehicles have attracted much attention.However,as far as the current situation is concerned,problems such as insufficient charging time,low charging efficiency,and actual environmental limitations on different types of vehicles have gradually emerged.In order to alleviate the problem that electric vehicles are limited by charging in people's daily life,this paper proposes a three-coil compensation method to improve the impact of the above problems.Firstly,the main types of vehicles,charging characteristics and application requirements in current cities are analyzed.Then,the functions of each component of wireless charging system are elaborated.According to the three main forms of electromagnetic induction,electromagnetic radiation and magnetic coupling resonance,a comparative analysis is made.A new type of vehicle wireless charging structure is proposed.Through the analysis and research of each part of the structure,the circuit structure and function realization of the transmitter and receiver parts are defined.In addition,the preliminary theoretical analysis and simulation validation of the three-coil compensation structure for the coupling part in static state are carried out by using MATLAB,and the situation of peak power and efficiency is obtained.Then,ANSYS Maxwell and Simplorer software platform is used to simulate,analyze and compare the dynamic coupling part of the system,and the step-by-step fixed condition method is adopted to analyze.It is clear that when all coils are square,the effect of power transmission is the best.On this basis,the coil winding mode is adjusted,and different types of magnetic cores are added to the transmitting and receiving coils.According to the magnetic field distribution cloud and mutual inductance curve,the coupling situation is analyzed,and the receiving device in the x-axis is obtained.The moving state in the direction is extended to the three-coil coupling structure with compensation coil,and the magnetic variation curves in the Y and Z directions are obtained by simulation analysis.From this,it can be seen that the three-coil magnetic core structure can indeed increase the coupling coefficient and transmission distance.Finally,apply the method of structural transition,through the analysis of transmission characteristics of each offset of two coils by using the software of matlab,it is found that the influence of the change of axial distance on the coupling effect is greater than that of the radial distance and rotation angle;the analysis of four-coil system shows that when the four-coil structure is evolved into three-coil structure under the SSSP structure,the same is true for the four-coil structure to evolve into three-coil structure.It can have all the advantages of four-coil coupling system,which also demonstrates the comprehensiveness of three-coil coupling structure from the side.At the same time,ANSYS Maxwell and Simplorer software is used to analyze the relationship between distance and efficiency of three-coil coupling system,and the influence of different coil shapes on transmission efficiency.In conclusion,a new type of coupling device is proposed in this paper.The three-coil structure composed of square coil and magnetic core is the optimum structure.Under static and dynamic charging conditions,it can meet the charging requirements of various chassis heights of various types of vehicles seen in daily life,and at the same time,to alleviate the current plight of limited charging of electric vehicles in cities.