Device for automatic recharging of 12 volt batteries in an emergency power supply 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 power supply for lighting, signaling and other devices at many facilities is 12 V batteries. However, during operation they are discharged. The proposed device for automatic recharging of batteries in the emergency power system during operation is shown in the diagram.
The device is powered by an AC voltage of 127-220 V and operates as follows. While charging battery B, thyristor T1 is open. In this case, the voltage U on potentiometer R4 is lower than the threshold voltage (12-14 V) of zener diode D7, and thyristor T2 is closed.
When the battery voltage approaches the value of full charge, the thyristor T2 opens, 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 RЗ. 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 nominal capacity of the batteries in the emergency power system.
Publication: cxem.net
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