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12Volts A Turn-off battery Cricuit

This 12V auto turn-off battery charger consequently separates from mains to quit charging when the battery is completely energized. It serves to charge the battery of our vehicle, utilizing the 120/240 VAC (exchanging current), that we12Volts A  have in our home.

On the off chance that we have this circuit we abstain from setting off to a specific workshop to play out the charge.



How the 12V Auto turn-off battery charger works?

The 12V Auto turn-off battery charger comprises of a full-wave rectifier (diodes D1 and D2). The yield voltage of the rectifier is throbbing ("m" molded) and is applied straightforwardly to the battery to be charged through the thyristor (SCR1).

12V Auto turn-off Battery Charger 


At the point when the battery begins charging (it is released), the thyristor (SCR2) is in the cut-off express (the thyristor resembles an open circuit). This implies the SCR1 thyristor door has enough voltage to trigger the thyristor and to convey current to the battery. The present important to trigger the SCR gets through the resistor R1.

At the point when the battery charge begins (the battery is released) the voltage at the potentiometer slider is low. This voltage is too little to "even consider reversing inclination" the 11 volt zener diode. In this manner the zener diode resembles an12Volts A  open circuit and SCR2 is kept in the cut state.



As the battery charges, the battery voltage increments, as the voltage at the potentiometer slider. Inevitably this voltage is sufficient to "switch predisposition" the zener diode and it triggers the SCR2 thyristor which presently resembles a short out.

At the point when the SCR2 thyristor conducts a voltage division is made with R1 and R3 resistors. This voltage division causes the voltage at the anode of diode D3 to be extremely little and SCR1 thyristor doesn't conducts, halting the present stream into the battery. At the point when this happens the battery is completely energized. In the event that the battery is released once more, the procedure begins naturally.

Capacitor C is utilized, to forestall the thyristor SCR2 from activating for undesired reasons. 


Rundown of 12V Auto turn-off battery charger parts

1 5 amps or more thyristor (SCR1)

1 amps thyristor (SCR2) 

3 47 Ω (ohms) resistors, 2 watts (R1, R2, R3)

1 750 Ω (ohms) potentiometer, 2 watts

1 Kω resistor (kilohm) (R4) 

1 50 uF, 25 volts electrolytic capacitor, (uF = microfarads) (C) 

3 amps rectifier diodes (D1, D2, D3)




1 11 volt zener diode, 1 watt (Z) 

1 110/220 VAC to 24 VAC focus tapped12Volts A  transformer, 4 amps

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