Research And Optimize Parameters Of The Wireless Charging System Based On Coupled Magnetic Resonances

With environmental degradation,energy shortage and the development of technology,electric vehicles have become a research hotspot with their own advantages.Although the electric car has developed rapidly in recent years,but the charging mode is still the traditional cable plug-in,this way not only pose a safety hazard,is not convenient,and can't meet the needs of future smart car,smart grid.Wireless charging technology can make up for these shortcomings,so the wireless charging technology plays an important role in the development of electric cars and future modes of transportation.This paper focuses on improving the system topology and optimizing system parameters to improve the transmission performance of the system.First of all,based on the theory of circuit was introduced in detail the principle of magnetic coupling resonant wireless power transmission.Then analyzed the four basic compensation,and according to the demand of transmission performance(high power,high efficiency)to determine the compound resonance structure can meet the demand.Then proposing a compound resonant structure:SPSP type resonant structure.A power matching method is used to determine the system parameters.Due to the large number of complex parameters,it is impossible to select a suitable set of parameter guarantee system to work in the ideal state.Then use particle swarm optimization algorithm to optimization of system.The characteristics of the system are analyzed by using the optimized parameters.Finally the results show that SPSP type structure performance is excellent,and suitable for electric vehicle charging.Finally,a three-coil topological structure is proposed to improve the transmission distance and reduce the loss of no-load.The value of compensation capacitance is determined according to the transformer equivalent principle and resonance theory,and the related characteristics of the system are investigated.Considering that different system parameters have different transmission performance,an improved shuffled frog leaping algorithm is proposed to optimize the system parameters.Then the results of optimization are applied to the system,the simulation analysis before and after optimization with working frequency,transmission efficiency and power load,the change of variables such as coupling coefficient curve,the result shows that the optimization of necessity.Finally,the transmission characteristics of the three-coils structure and SPSP structure are compared,and the three-coils structure is more suitable for high-power wireless charging.