Research On High Efficiency Integrated Resonance Charger Based On DSP

The exhaust emission of fuel vehicles powered by oil and gas is an important source of air pollution,and the emission reduction of fuel vehicles has become an effective method to curb air pollution.The new energy pure electric vehicle of zero-emission becomes the perfect substitute for fuel vehicle,and the charging system of pure electric vehicle becomes the guarantee of its effective work.The high frequency,miniaturization and wide output voltage of high frequency resonant circuit can be used as the main circuit topology of the on-board charger.This thesis mainly studies the highly efficient conversion of resonant charger,repectively researchs and optimizes issues of highly integrated LLC topological structure,optimization of control methods,loss problem of magnetic components,harmonic effect.Based on these researches,the overall conversion effciency of on-board charger is improved.First of all,the transformer integrated scheme,double closed loop digital PI control strategy and seven-stage compensation charging control algorithm are proposed for the miniaturization of the on-board charging machine;In order to improve efficiency,the Z source PFC scheme is proposed;The composition principle of the magnetic components is analyzed,and the specific optimization of the resonant soft switch is made based on the combined control scheme and the resonant circuit theory.Secondly,simulation verification is carried out using Matlab/Simulink simulation platform,and the simulation verification provides the parameter basis for the experimental prototype construction.Finally,based on the above researches,an experimental prototype with 220 V input ac mains,0V?100 V adjustable output voltage and 0A?18 A adjustable output current is designed.The maximum output power of this prototype is 1.2 KW.The control circuit and power circuit of the prototype are designed by Altium Designer,they are designed to match the driving circuit,sampling circuit and power circuit of the prototype,etc.The control circuit uses TMS320F28027 as the main control chip to carry out the generation of the driving signal and the realization of the control algorithm.An experimental test is carried out on the built prototype,the theoretical analysis of the experimental data proves the feasibility and correctness of the project's theory and simulation,and the research provides a reference direction for the optimization of charging system of pure electric vehicles.