Research On Modeling And Electromagnetic Compatibility Of Wireless Charging System For Electric Vehicles

As an important direction for the transformation and upgrading of the global automotive industry and the resolution of energy shortages and environmental pollution,electric vehicles are increasingly valued and vigorously developed by various countries and regions.With the continuous promotion,popularization and application of electric vehicles,more and more technical links encountered bottlenecks,charging technology is one of them,and the application of wireless charging methods in electric vehicles solves a series of problems of traditional wired charging methods: electrical isolation avoids the potential safety hazards caused by plugging in and solves infrastructure building space,better coping with extremely complex environments,matching with intelligence and completely solving the shackles of batteries with dynamic wireless charging,etc.The application of electric vehicle wireless charging systems is conducive to accelerating the faster and better application and development of electric vehicles.However,in the design and application of electric vehicle wireless charging technology,how to quickly analyze and model complex systems,as well as system performance degradation caused by electromagnetic compatibility problems and radiation hazards to the human body have become issues that need to be studied in the future.With the support of related projects and the above issues,this paper has carried out the following research work:The principle of the inductively coupled energy transmission system is analyzed,the two-port network model is used to unify the compensation structure,and the transmission power and transmission efficiency of the system under the four basic compensation structures are compared and analyzed,and the situation of the composite compensation network is introduced.Finally,how to use the two-port network to quickly calculate the transmission characteristics of the system is given.Based on the theoretical analysis,the coil structure of the coupling mechanism is selected,and the different factors that affect the coil parameters are analyzed: coil radius,coil turns,coupling distance,offset,and the presence or absence of a magnetic core.The co-simulation function validates the results of theoretical analysis,at the same time,the two-port network is simulated and compared,and the magnetic field distribution of the coupling coil and the magnetic energy density cloud map are derived to obtain a wireless charging system with an output power of6 kW and a transmission efficiency of more than 90%.Finally,the shielding principle of the coupling coil and the influence mechanism of the electromagnetic environment on the human body are analyzed.The general electromagnetic compatibility performance of the system under the shielding condition is comprehensively analyzed,including the improvement of the system performance and the safety of human radiation.It is obtained that the system meets the radiation standard limits.