Universal-battery-charger


Posted on Jun 4, 2012

When power is applied to the circuit, SCRl is off, so there is no bias-current path to ground; thus, L~317 acts as a current regulator. The LM317 is umnected to the battery through steering diode Dl, limiting resistor Rl, and bias resistor R2. The steering diode prevents the battery from discharging through the LED and the SCR when power is removed from the circuit.


Universal-battery-charger
Click here to download the full size of the above Circuit.

As the battery charges, the voltage across trip-point potentiometer R5 rises, and at some point, turns on the SCR. Then, current from the regulator can flow to ground, so the regulator now functions in the voltage mode. When the SCR turns on, it also provides LEDl with a path to ground through R3. So, when LEDl is on, the circuit is in the voltage-regulating mode; when LEDl is off, the circuit is in the current- regulating mode.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

12V stroboscope
Beam-break Detector For Camera Shutter or Flash Control
Light dimmer
Lead-Acid Battery Charger Circuit
Telephone line burglar alarm circuit diagram



Top