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电路设计->电源电路图->其他电源电路图->12V密封铅酸电池双电平浮充充电器--Lead-acid battery charger

12V密封铅酸电池双电平浮充充电器--Lead-acid battery charger

作者:dolphin时间:2016-08-24

图为一个环境参数测试仪中的蓄电池充电器的实际应用电路。其中:电池的额定电压为12V,容量为7Ah,VIN=18V,VF=13.8V,Voc=15V,IMAX=500mA,IOCT=50mA。由于充电器始终接在蓄电池上,为防止蓄电池的输出电流流入充电器,应在串联调整管与输出端之间串入一只二极管。同时为了避免输入电源中断后蓄电池通过分压电阻R3放电,设计时将R3通过电源指示晶体管(7脚)连接到地。

  当18V输入电压加入后,串联的功率管TIP42C导通,开始大电流恒流充电,充电电流为500mA,这时充电电流保持不变,电池电压逐渐升高。当电池电压达到过充电压Voc的95%(即14.25V)时,电池转入过充电状态,此时充电电压维持在过充电电压,充电电流开始下降。当充电电流降到过充电终止电流(IOCT)时,UC3906的10脚输出高电平,比较器LM339输出低电平,蓄电池自动转入浮充状态。同时充足电指示发光管发光,指示蓄电池已充足电。

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