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When the battery is fully charge charging stops automatically.
Automatic emergency light circuit rechargeable battery. When ldr light dependent resistor is in light the resistance of ldr is very low. Once the power is restored back to this emergency rechargeable light circuit t2 is switched off the battery starts charging and the cycle repeats. This happens because the minimum forward voltage required to light up white leds is around 3 5 volts plus series voltage drop.
When the power fails the white led s which are connected mosfet will glow based on the light condition till the battery shuts down. The charger power supply section is built around. A 6v 4 5ah rechargeable battery is connected to the array of leds through a relay.
However when power. We have used relay here to automate this. It has its own battery charger.
Note that in a common capacitive power supply there s a zener diode to limit its output voltage whereas this circuit just uses the sla battery to provide a low impedance clamp. While charging diode d5 pulls the base of the led driver transistor t1 down to turn off the light source led2. The second part of the emergency light circuit consist the main functionality that is to automatically switch on the emergency light array of white leds on power failure.
The light turns on automatically when mains supply fails and turns off when mains power resumes.
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