Device for automatic recharging of batteries in the emergency power system. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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The emergency lighting power source at many facilities is 12 V batteries. However, during operation, they are discharged, and the illumination decreases. The proposed device for automatic recharging of batteries in the emergency power system during operation is shown in Fig.1.
The device is powered by AC voltage 127-220 V and operates as follows. While the battery B is charging, the thyristor T1 is open. In this case, the voltage U on the potentiometer R4 is below the threshold voltage (12-14 V) of the zener diode D7, and the thyristor T2 is closed.
When the battery voltage approaches the value of full charge, the thyristor T2 is unlocked, and through the voltage divider R6-R7, a blocking voltage of negative polarity is applied to the control electrode of the thyristor T1. Thyristor T1 closes, the battery is discharged and goes into the recharging mode with a small current, determined by the resistance value of resistors R1, R2 and R3. The charge current value can be set by resistor R2.
The value of the charging current of the battery can be measured with an ammeter connected instead of jumper P. Recharging of the battery starts automatically when its voltage drops so much that the thyristor T2 closes.
When you first turn on the circuit, you must configure it. This is achieved by changing the resistance of the resistor R4 to such a value until a current appears in the battery circuit and the thyristor T1 opens. In the future, the circuit does not need to be adjusted and works automatically. The device not only recharges, but also maintains the commemorative capacity of the batteries in the emergency power system.
Literature:
- V.G.Bastanov. 300 practical tips. Moscow worker, 1986.
Publication: N. Bolshakov, rf.atnn.ru
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