Research Of Magnetic Coupling Resonant Wireless Power Transfer System For Electric Vehicle

As a new technology,wireless power transfer(WPT)technology of electric vehicles is attracting more and more attention.Based on the magnetic coupling resonant WPT technology,this paper uses the integrated LCC compensation topology of the wireless power transfer system to achieve the transmitter coil and output current independent of the load and coupling distance characteristics,but also to achieve high-power and high-efficiency wireless energy transmission.The research work of this paper is as follows:The compensation topology of wireless power transfer system is analyzed by using basic circuit analysis method.In the traditional LC compensation topology,the topological characteristics of the topology are analyzed by using SS compensation topologies.In the complex compensation topologies,the characteristics of the topology are analyzed by an example of an integrated LCC compensation topological topology.Through the simulation of two topological systems,we analyze its advantages in the application of electric vehicles and then determine the system using integrated LCC compensation topology.The working principle of compensation topologies,parameter matching and the relationship between component voltage and current and parameters are studied.By introducing T-type immittance converter,the principle of the integrated LCC compensation topology is studied.Based on this,the parameter matching method of the topology is studied in detail.The theoretical current formula of the circuit element is derived,and the numerical simulation method is used to study its numerical value and trends.The experimental platform of wireless power transmission system for electric vehicles is set up.According to the actual voltage and power requirements of electric vehicle batteries,appropriate inverter circuit and rectifier circuit are designed.The main work includes the selection of the circuit topology,power device selection,driver chip selection.Based on the simulation results,a lot of work has been finished,including the material selection and coil winding of the primary and secondary coil,selection of compensation circuit capacitor and circuit production.At last,the experimental verification of the system is finished.The voltage and current waveform in different situation are obtained by experiment and we compare them to simulation curve to verify the theoretical analysis in this paper.Finally,we achieve the transmission power of 3.3KW,the efficiency of 94% to complete the wireless power transmission.