摘 要电动自行车是绿色节能的交通工具，在节能环保的进展进程中电动自行车满足了消费者出行半径增大的需求。另外，电动车电瓶采纳锂电池越来越多。利用开关电源实现对锂电池高效率充电是目前的进展趋势。本设计通过仔细调查锂电池充电注意事项，电动车用锂电池充电过程和充电曲线，综合运用了反激式开关电源技术，对电动车用锂电池充电器做了具体设计。电路主要包括整流滤波电路、功率变换电路、稳压电路、恒流电路，充电指示电路，实现对锂电池分四个阶段高效率安全充电。充电过程分微弱电流调节充电阶段，恒流充电阶段，恒压充电。主电源部分采纳线性光耦改变电流型 PWM 控制集成芯片UC3842 中误差放大器的输入误差电压，实现稳压充电。恒流电路实现对锂电池恒流充电。电路设计满足客户要求，成本低廉。关键词：反激式开关电源；锂电池充电器；UC3842；恒流充电AbstractElectric bike is a green energy-saving means of transport, energy-saving environmental protection in the process of development of electric bike to meet the consumer demand for travel radius.In addition, the electric bike battery using lithium batteries is increasing. Use of switching power supply to achieve high efficiency on the lithium battery charge is the current trend.The rechargeable lithium battery design through careful investigation note, lithium batteries for electric vehicle charging process and charge curves of the integrated use of a flyback switching power supply technology, lithium battery charger for electric vehicles to do a specific design.Circuit includes a rectifier filter circuit, power converter, voltage regulator circuit, the current circuit, the charging indicator circuit, charging in four phases of the lithium batteries safely and efficiently. Charging process comprises weak charge current regulation phase, constant current charging phase, constant voltage charging. The main power to change the input error voltage of the error amplifier in Current-mode PWM control IC UC3842 t...
