| With the rapid development of electric vehicles,the development of both charging technology and charging devices is driven.At present,most electric vehicle charging equipments adopt the charging methods through manual plugging in the power and wired charging.Charging equipment is generally fixed and takes up with a large area.The way that the car can only be charged at a designated hazards has many problems including low efficiency,line aging and leaking.There are many advantages in wireless charging technology,such as convenient charging,no electrical hazards and high operability.It has broaden prospect of development in electric vehicle charging.Therefore,they are important research significance to study the factors that affect the efficiency of electricity vehicle wireless charging and design efficient wireless charging devices.Firstly,in this paper,the topological structure of wireless power transmission systems of the magnetic coupling resonant is analyzed.The influence of the SS topological structure and the SP topological structure on the wireless charging efficiency of electric vehicles are studied.Through the analysis of the simulation results,a topological structure,which can improve the coupling coefficient,is proposed.Secondly,in this paper,the primary and secondary coil model of electric vehicle wireless charging is established,and the influence of the coil shape and size in the wireless charging systems on the efficiency of electric vehicle wireless charging is analysis.Through the analysis of the simulation results,the coil structure of the charging device of the electric vehicles is optimized.Meanwhile,research and simulation analysis on the influence that the position change of the primary and secondary coils of wireless charging on the efficiency of wireless charging is conducted.The coil position offset threshold suitable for wireless charging of electric vehicles is given.Through the optimization analysis of the coil shape,size and position relationship,the structure of the wireless charging systems with the best charging efficiency is given.Finally,the coil self-alignment method of the wireless charging device is studied and both the software and hardware of the corresponding device is designed.The device uses STM32F103 as the main control chip.After the parking space detects that the vehicle is parked,the owner sends a charging request,and the charging device moves to the designated parking space along the track.Receiving the signal from the vehicle chassis and driving the stepper motor to adjust the position,the charging device aims to align the coil to achieve the maximum charging efficiency requirement. |
