Research And Design On Resonance Compensation Topology Of Wireless Power Supply System For Electric Vehicles

With the rapid development of society,the number of electric vehicles is gradually increasing.In order to solve the problem of short cruising range,the use of Inductive Contactless Power Transfer(ICPT)to dynamically power electric vehicles has become a kind of new directions for development.Based on the inductive non-contact power transmission technology,this paper studies the related problems of the resonance compensation topology in the dynamic wireless power supply system of electric vehicles.Firstly,this paper analyzes the characteristics of three types of inverters and selects the inverter structure suitable for this subject.The performance and inferior performance of multiple resonant compensation circuits are analyzed.At the same time,the loose coupling transformer is analyzed,and the mutual inductance model of the loosely coupled transformer is established.Based on this,the mutual inductance equivalent model of the loose coupling transformer with multiple primary structures is established.Secondly,based on the resonant topology of LCL circuit,the circuit characteristics of the system under constant current and constant voltage conditions are analyzed.The relationship between the ratio of the third harmonic current peak to the fundamental peak and the ratio of quality factor to inductance is obtained.Then,the structural model and equivalent circuit model of the primary parallel dual parallel mobile wireless power supply system are established.The method of simplifying the mutual inductance is used to simplify the derivation process of the reflection impedance in this model,and the design of each parameter in the primary and secondary circuits is completed.And realize the stability of the system output voltage.On this basis,the influence of system parameters on the characteristics of the primary and secondary sides under load variation conditions is analyzed.Thirdly,in order to analyze the influence of the original and secondary coil structure design on the mutual inductance stability,this paper uses Ansoft software to establish the magnetic field simulation model of the wireless power supply system of the primary side double parallel coil,and analyzes the change of the primary side parallel coil spacing and the inflow primary coil.The influence of current direction and other factors on the magnetic field strength between the primary and secondary sides.In addition,in order to verify the correctness of the parameters design of the original and secondary side resonance compensation circuits,the Simulink model of the primary side double parallel mobile wireless power supply system is established,and the designed parameters of the primary and secondary circuits are brought into the design.The model analyzes the simulation of the system voltage output waveform and the load variation and the simulation of the coil error.In addition,the relationship between system output characteristics and the ratio of the original and secondary inductances is analyzed.Through the simulation analysis,the correctness of the theoretical derivation and analysis of this paper is verified,and the correctness and feasibility of the subject are verified.Finally,in order to complete the experimental model construction of the wireless power supply system,this paper designs an improved full-bridge inverter,including the design of the main circuit and the design of the control program.Based on this,the simulation experiment platform is designed.