Study On Modeling Of Wireless Charging System For Electric Automotive And Electromagnetic Safety

With the degradation of the environment and the aggravation of the energy crisis,electric vehicle has become a research hotspot becauseof its exceptional advantages. But the transfer of electric power is a key factor which hinders its development. Most of the electric vehicles still need to be plugged in for recharging. This way of charging can not only be affected by the weather easily but also inconvenient. The emergence of wireless charging can overcome these shortcomings, this kind of charging is more convenient,flexible and available. So the study for wireless charging method is much valuable, and application is more significant.The wireless power transfer for electric vehicles mainly based on two types—electromagnetic induction and Magnetic resonant coupling. People started to do research on the way of power transfer which based on electromagnetic induction more than a decade ago. Since the research group in MIT proposed wireless power transfer techniques based on magnetic resonances in 2007, more attention has been shifted to the research of the wireless power transfer based on magnetic resonant coupling. In just ten years, wireless power transfer based on magnetic resonant coupling has been developed rapidly.This paper supported by the Natural Science Fund Project " Study on the transmission characteristics and the spatial magnetic field effects on the human body to magnetic resonance type radio "(51477014),the researcher mainly conducted the following studies:(1) Though the comparison and analysis of four methods of compensation on magnetic resonant coupling from the view point of transmission capability, the method of series compensation is finally defined.(2) Modeled the wireless power transfer system of electric vehicle based on series compensation. Using the finite element simulation software to analyze the transmission power and efficiency. From the aspect of electromagnetic fields, the paper introduces the electromagnetic distribution that surround coils, and found further evidence in the analysis of electromagnetic energy and magnetic field lines to support the energy transmission capability in the system. The output power of the system is 3790.81 W,and efficiency up to 87.53% in the end. The system meets the requirements of the power and efficiency level of SAE, and can be realized in practice.(3) On the basis of the above wireless power transfer system, the paper further analyzes the electromagnetic security. The researcher constructed 3D body model and finite element model of complete vehicles separately, then simulated and analyzed the electromagnetic absorption of human organs when human exposure to the resonant system and vehicle charging system. Compared with the ICNIRP derived standards and national standard of China, the author evaluated the electromagnetic safety of the system.