Design And Research Of A 3.3kW Electric Vehicle Wireless Charging System

With the increasing problems of air pollution and energy shortages,people began to explore and look for an environment-friendly,green,energy-saving way of travel,and it could replace the existing traditional car.Electric vehicles have the characteristic of without pollution,low power consumption,which the public gradually paid attention to.Finding such a business opportunity,the major auto manufacturers invest a lot of money,research and launch their own brand of electric vehicles.However,in the process of promotion of electric vehicles,because of the most fundamental problems,charging problem and battery life problem,have not been resolved adequately,and the problems leading to the development of electric vehicles has been a great hindrance.In this paper,we find a way to solve the problems,recommended a more innovative charging technology-electric vehicle wireless charging technology.Due to there is no need of wire connection,a wireless charging system occupys less area,provides a simpler way to charge and in the meantime,maintains high safety.In daily use,there is no need to worry about forgetting of charging,which sovles the problem of charging inconvenience.The research topic of this thesis is the design and research of the wireless charging system of 3.3kW electric vehicle.The entire charging system includes DC-AC full-bridge high-frequency inverter part,high-frequency rectifier part and LC filter,sampling and control circuit,Compensation network and charging board(transmission coils and magnetic core).The energy transmission method is realized by magnetic resonance,that is,using two transmission coils at the same resonant frequency with the resonance principle to achieve.The compensation network use double LCC compensation structure,and through the use of Linear Technology simulation software LT Spice,we could achieve simulation and design.Charging board and coil structure is designed and optimized by the electromagnetic simulation software ANSYS 17.0.And Hardware circuit design is used by electronic circuit design software Altium Designer 10.After the design and hardware and software debugging process,the result is:the input voltage 346.8V,and the output voltage 330V,92.4%efficiency of the 3.3kW wireless charger,the charge plate round launch disc diameter of 550mm,round Shaped to receive disk diameter of 450mm,between the board air gap is 150mm,allowing the maximum horizontal offset tolerance of 100mm.