预防蓄电池过放电保护电路

A Protection Circuit for Batteries Overwork

用蓄电池做后备电源的系统 (或设备 ) ,常因过放电导致电池提前报废而造成设备故障 .根据电池电压随容量变化的规律 ,利用电压比较器和电压基准源设计制作了电池放电保护电路 ,当电池放电量接近容量的 5 0 %时 ,启动预警信号 ;当电池放电量达到容量的 80 %时 ,电路自动切断负载 ,防止电池过度放电 ,延长电池寿命 ,保证系统 (或设备 )在供电恢复正常后能正常运行 .

The rechargeble batteries are used for backup power internal electrically equipments and instruments.But batteries lifetime usually is shorten by overwork and then malfunctions of equipment are induced.To avoid the complexion described above,the protection circuit against overwork is designed.It is based upon the voltage comparator and regulator.It will light up a red LED when the volume of the batteries discharged close upon 50%;It will switch off the load automatically when it discharged closing to 80% of their energy capacity,thus overwork of batteries can be avoided and lifetime may be extended.