This is the Simple Battery operated emergency light Circuit Diagram.
This simple circuit providers battery operated emergency lighting
instantaneously upon failure of the regular ac service. When line power
is restored, the emergency light turns off and the battery recharges
automatically.
Simple Battery operated emergency light Circuit Diagram
The circuit is ideal for use in elevator cars, corridors and similar places where loss of light due to power failure would be undesirable. Completely static in operation, the circuit requires no maintenance. With ac power on, capacitor CI charges through rectifier CRI and resistor Rl to develop a negative voltage at the gate of the C106Y SCR . By this means, the SCR is prevented from being triggered, and the emergency light stays off. At the same time, the battery is kept fully charged by rectifier CR2 and resistor R2.
Should the ac power fail, CI discharges and the SCR is triggered on by
battery power through resistor R3. The SCR then energizes the emergency
light. Reset is automatic when ac is restored, because the peak ac line
voltage biases the SCR and turns it off.
Sourced By: Strempowers
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