Research And Implementation Of A Battery Charger For Urban Rail Vehicle

With the constant advance of China’s urbanization,urban rail transit construction attracts more and more attention.while as an important part of urban rail transit,metro’s independent development is also being promoted rapidly.The battery charger undertakes the task of providing stabilized power supply for the control circuit,metro door,on-board signal,direct current illumination,and communication device of the subway system,as well as storages battery charging.Therefore,it has great practical application value and research significance to enhance the charge characteristic study of metro vehicles’ storage battery and the performance optimization of battery charger.On the background of the research and development of metro vehicles’ battery charger,firstly the merit and demerit of existing DC-DC circuit topology is analysed,On the background of the research and development of metro vehicles’ battery charger,firstly the merit and demerit of existing DC-DC circuit topology is analyzed,the phase-shifted full-bridge ZVS circuit is confirmed as main circuit topology,the working process of phase-shifted full-bridge ZVS circuit and the problems existed in the circuit are analyzed,the innovation design is made for main circuit,and the characteristics of the battery are analyzed,the two-stage PID control algorithm is designed.Secondly,according to the power level of battery charger and other requirements,the parameter design for the switching tube in the circuit,blocking condenser,main transformer,resonant inductance capacitance,and filter circuit is completed.Then,on the basis of theoretical calculation,circuit model is set up by utilizing Matlab software,in the condition of load change and input voltage fluctuation,simulated analysis on the circuit is conducted,and the feasibility of scheme is verified.Lastly,the control circuit of DSP+FPGA frame is designed,the battery charger system’s hardware circuit and software program design are finalized,some control systems’ hardware circuit and software flow diagram are provided,25kW experimental prototype are set up,and routine test is carried out with its result reaching the design requirement.