Research And Develop Of 100% Low-Floor Light Rail Vehicle Battery Charger

This paper is the "11th Five-Year" plan national scientific and technological support issues "100% low-floor light rail vehicle" developed for the project background, the focus on the auxiliary power supply equipment in the battery charger (DC/DC converter) to do some research. Battery charger is not only charged with the task of rechargeable battery, but also for low-floor vehicles on-board equipment to provide power control circuit. Battery charger voltage and current output should strictly follow the rechargeable battery to design characteristic curve.Battery charger combines the most active and forefront research areas of the high-power soft-switching technology and digital control technology, based on the design of the phase-shifting digital control soft-switching full-bridge circuit switching frequency of 20kHz, and the basic theory, circuit topology, auxiliary switching power supply design, computer simulation, system integration and test, and a series of tasks.This paper first introduces battery charger on the history and development. Charger including the main circuit topology, control methods and recharging method of progress, focusing on soft-switching full-bridge converter the working principle and its main circuit improvements made meticulous research.This paper designs the auxiliary switching power supply of battery charger, the DPA-Switch series chip is introduced, and the corresponding design of a one-port flyback multiple-output switching power supply to the charger for the driving circuit power supply.This paper designs the charging characteristic curves and temperature compensation curve, the phase shifter control PWM pulse briefly principle of the formation of the charger and the drive circuit protection circuit to a certain research and experimental work, dedicated driver chip design based on the main switching device driver circuit.Using Matlab/Simulink to establish the simulation model of the main circuit, and according to the simulation parameters and results, a 8kW battery charger has been designed for experiment. The experimental results which accord with the principle and the simulation indicate that the validity of the design is verified and provide a foundation for practical application.