Battery discharge signaling devices. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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It is known that discharging a battery to a voltage level below the allowable voltage for each specific type leads to a decrease in its resource or can completely damage it. To prevent this from happening, it is necessary to periodically monitor the voltage on the battery, which is inconvenient, given that this requires a voltmeter.
Rice. 5.20. indicator light
The voltage level signaling circuits have been repeatedly published in magazines, however, the devices proposed in this article have fewer details and are characterized by low consumption.
The construction of the following circuits is based on the voltage level indicator on the transistor (VT1) operating in the microcurrent mode. At the same time, the transistor has a very high gain and when the supply voltage changes by 0,1 V, it switches from the locked state to the open one.
Rice. 5.21. Sound indicator
On fig. 5.20 shows a diagram that allows you to show (by the glow of the HL1 LED) a decrease in the voltage level on the batteries below the permissible norm. The LED can be of any type. The voltage level at which the signaling device is triggered is adjusted by resistor R2 (it is more convenient to use a multi-turn one, such as SP5-2).
But sometimes it is better to have an audible alarm, since the glow of the LED can be overlooked in time.
Rice. 5.22. The topology of the printed circuit board of the sound indicator (the piezo emitter is installed on the side of the printed conductors above the board)
On fig. 5.21 shows a diagram of an audible signaling device on a HF1 piezoelectric emitter (ЗП-1 or any similar). The level of the controlled voltage can be from 2 to 30 V, but when using a circuit with a voltage of more than 9 V, it is necessary to select the value of the resistor R5 so that the circuit, with a sufficient volume of the piezo sound, consumes no more than 1 ... 2 mA in the alarm mode . The sound frequency depends on the capacitor C1, and it can be changed.
Coil L1 contains 600 turns of PEV wire with a diameter of 0,08 mm (0,1 or 0,12 mm), wound on two rings glued with glue, size K10x6x3 mm, made of ferrite 600NM1 or 1000NM1. The topology of the printed circuit board is shown in fig. 5.22.
Publication: cxem.net
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