Research On Power Supply And Receiving Coils Of Wireless Power Supply System For Electric Vehicles

As the fossil energy that can be exploited and utilized is becoming less and less,and the environmental pollution is becoming more and more serious,the development of human society is seriously affected.One of the main causes of environmental pollution is automobile exhaust emissions.To solve this problem,governments It began to call for the use of new energy vehicles to reduce the environmental pollution caused by vehicle emissions.In the field of new energy vehicles,the development of electric vehicles is the most eye-catching,because cars have become the main means of transportation for families and are closely related to people's lives.In recent years,electric vehicle technology has developed rapidly,but most electric vehicles are still charged by cable plug-in charging,that is,contact charging.This charging method has many drawbacks,such as long charging time,limited charging location,large wear of charging equipment,and certain safety hazards.In addition,the old batteries of electric vehicles not only have their own weight,but also the new environmental pollution is still serious due to aging replacement.These shortcomings are also affecting people's car experience and attracting widespread attention.In order to solve the shortcomings of current electric vehicles,many researchers use the principle of Inductive Coupled Power Transfer(ICPT)to transfer electric energy in the power grid to the car through contactless means.The operation of the car.This can solve many of the drawbacks of contact charging.This paper mainly studies the problems that arise in the dynamic charging process of electric vehicles.When the power transmitting coils used are segmented cascaded,the on-board energy harvesting coils have problems of voltage and charging efficiency degradation caused by the mutual inductance drop at the rail cascade.In-depth research,based on the existing research,proposes a four-step phase-embedded electric energy transmitting coil structure,and combines the theory to optimize and improve the structure.A large number of software simulation experiments and experimental verification are carried out on the design scheme.Based on COMSOL Multiphysics electromagnetic simulation software and MATLAB operation software,the electromagnetic coupling simulation between the running domain and the switching domain is carried out on the rectangular vehicle energy acquisition coil.The turns ratio between the switching domain compensation coil and the running domain coil is obtained through theoretical calculation.The simulation software builds a 3D simulation model,continuously optimizes the adjustment parameter structure,compares the experimental mutual inductance value with the magnetic field distribution,and obtains the optimal theoretical model.On this basis,the size and energy acquisition efficiency of the energy acquisition coil In-depth study is carried out to obtain the optimal energy acquisition coil parameters,and the lateral offset tolerance and the efficiency of the entire power supply system are obtained for the energy acquisition coil simulation.Finally,the experimental object was verified by the research object.Set up an experimental platform consistent with the simulation parameters,test the voltage and current of the energy acquisition coil,calculate the efficiency of the wireless power supply and compare it with the existing research results.The experimental results show that the four-step phase embedded electric energy transmitting coil and the rectangular vehicle energy acquisition coil designed in this paper have good feasibility and practicability.