Low battery indicator. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Low battery indicator

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Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells

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The diagram of the battery discharge indicator with a rated voltage of 12,6 V is shown in the figure. The threshold for its operation is chosen equal to 11,3 V. The DA1 microcircuit ensures stable operation of the indicator due to the reference voltage source included in it (7,15 V), whose changes in the temperature range of 0 ... 75 ° C do not exceed 15 mV. The output of this source (pin 6 DA1) is connected to the non-inverting input (pin 5) of the microcircuit comparator. Its inverting input (pin 4) is supplied with voltage from the battery through the divider R1R2. The resistances of the divider resistors are chosen in such a way that when the supply voltage drops to the threshold level, the voltage on the pin. 4 microcircuits turned out to be equal to the reference voltage. If the voltage on the pin. 4 decreases below the reference, the comparator changes its state and the signal that appears at the same time on the pin. 9 of the DA1 chip, includes an indication unit (VT1, R4, HL1).

Low battery indicator

You can adjust the indicator using any laboratory stabilized power supply. It should be connected to a voltage indicator instead of a battery (+12 V). The voltage of the power supply must be regulated within the range of 10 to 15 V, it should be controlled with a digital voltmeter. When the voltage drops to the threshold value, the HL1 LED should light up. If this does not happen, it is necessary to change the value of one of the divider resistors R1R2, or connect an additional resistor with a resistance of 50 ... 500 kOhm in parallel to one of them. Connecting such a resistor in parallel with resistor R1 will lower the indicator threshold, and in parallel with R2 it will increase it.

At the nominal battery voltage (12 V), the LED does not light up, the indicator consumes no more than 2 mA.

The device can use KR142EN14 or mA723 microcircuits, KT3102 series transistors with any letter indices, AL307BM LEDs.

Author: M. Kroszka

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