Electric Vehicle Lead-acid Battery Charger Developed

In order to achieve energy savings and ease pressure on the shortage of petroleum resources,development and utilization of new energy sources has been the theme of the world. Battery poweris treated as a new energy future, is widely used in the automotive industry. Battery power is treatedas a new energy future, is widely used in the automotive industry. Compared to conventional fuelvehicles, electric car is a huge advantage in terms of energy saving and environmental protection.Based on the characteristics of lead-acid battery charge and discharge, power lead-acid batterycharging current methods were analyzed, the principles three law of Maas and the polarizationphenomena of fast charging process is explained. First, a240W lead-acid battery charger isdesigned, it uses a three-stage charging mode. It is possible to charge the lead storage battery of48V.The Circuit uses a fly-back topology, and gave details of the conversion process works of the maincontrol circuit, high-frequency transformer design process and conversion of the feedback loop.Then, in order to achieve high current lead-acid battery fast charge, a550W switching powerconverter is developed that can provide maximum45A charge current for single12V lead-acidbatteries. The inverter main circuit design process is given, and using full-bridge topology, analysisof zero-voltage soft-switching technology in the phase-shifted full-bridge circuit, focuses on thework process resonant circuit in the circuit, resonant inductor and high-frequency transformer ofcalculation methods were introduced. A auxiliary power supply is designed. Power supplymaximum output power is24W. The design process of the auxiliary power supply is description.Regulation and load regulation of auxiliary power supply is tested. The charger control circuit isdesigned, which uses UCC28950controller chip, by adjusting the parameters specified controlcircuit to set different dead time and phase to achieve system stability. In addition, the chargerprotection circuit, the control circuit, the temperature detection circuit is designed.The circuit is simulation software. The simulation waveform is given, theoretical parametercalculation, the gradual completion of the charger schematic design, a prototype was designed.Experiment tested the performance of the circuit main power module, while the experimental resultsand the theoretical analysis of the simulation results were compared, and the48V lead-acid batterieswere charging experiment. Experimental results show that the charger is designed to achieve thedesired requirements.