3V battery under-voltage alarm circuit

The utility model discloses a 3V battery under-voltage alarm circuit which is composed of a boost voltage stabilizing circuit, a comparison and oscillation circuit and an alarm circuit. One input end of the comparison and oscillation circuit is connected with a reference voltage, the reference voltage is realized by dividing 5V output by the voltage boosting and stabilizing circuit, the other input end of the comparison and oscillation circuit is connected with the voltage output by the battery, and the output of the comparison and oscillation circuit is connected with the alarm circuit. According to the utility model, a conventional working voltage comparator is used for an undervoltage alarm circuit when the voltage of a 3V battery is lower than 2.2 V, and the undervoltage alarm circuit has the advantages of simple circuit, reliable work, low cost and the like. 本实用新型公开了一种3V电池欠压报警电路，该电路由升压稳压电路、比较和振荡电路以及报警电路组成；所述比较和振荡电路的一个输入端连接基准电压，该基准电压通过将升压稳压电路输出的5V经过分压后实现，比较和振荡电路的另一输入端连接电池输出的电压，其输出连接报警电路。本实用新型利用常规工作电压比较器针对