Battery charger. Encyclopedia of radio electronics and electrical engineering

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

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The scheme of the automatic battery charger is simple.

Thyristor VS2 performs the functions of a half-wave rectifier that charges the battery. VS2 opens when pulses of positive polarity arrive through a chain consisting of resistor R1 and diode VD1 At this time, thyristor VS1 is closed. It opens when the voltage on the potentiometer R4 reaches the breakdown voltage of the Zener diode VD2. Then the control electrode VS2 is shorted to ground and the battery charging is automatically stopped.

The engine of the variable resistor R4 is set so that the thyristor VS1 fires at the moment when the battery is fully charged.

To indicate the end of the charge in parallel with the thyristor VS2, you can turn on an additional chain consisting of a diode, resistor and LED. When VS2 is closed, the LED is on, and when VSXNUMX is open, the LED is off.

Author: Shelestov I.P.

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