Battery discharge control indication circuit diagram

The figure below is the battery discharge control indication circuit. It consists of R1, RP, VDw, VT1 and J to form an over-discharge control circuit: R3, C2, VT2 and VT3 form an over-discharge indication circuit. When switch S is turned on, the battery voltage R1, RP The voltage breakdown VDw causes VT1 to saturate and conduct, the relay J works, the 1.3 normally open contact is connected, the green LED2 emits light, and the load R1 is powered to work. When the battery voltage drops to the originally set 10~10.5V, R1 and RP The partial voltage cannot breakdown VDw, so that VT1 cannot be saturated and conductive, and relay J stops working. The 1.3 normally open contact is disconnected, the 1.2 normally closed contact is connected, the green LED2 goes out, and the load R2 stops working. The battery voltage passes through R3 to charge C2 (the charging time is determined by R3 and C1), causing VT2 and VT3 to conduct intermittently. The red LED1 flashes to remind the user that the battery is under voltage at this time and the battery should be charged to avoid over-discharge of the battery. And damaged.

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