Power failure light and circuit therefor

Details Power failure light and circuit therefor Power failure light and circuit therefor

1978-09-29

1979-12-04

Padgett, Benjamin R.

Illumination

Automatic substitution of power supply or light source

362183, 362254, 315 86, F21V 1904

Patent

active

041775007

ABSTRACT:
A power failure light for monitoring a power line and for illumination upon the interruption of power therefrom includes a light bulb, a rechargeable battery, a power supply providing charging current for the battery, a pair of diodes connecting the battery across the power supply, a pair of cascaded transistors connecting the bulb across the battery with the base-emitter junctions of the transistors connected across the diodes to thereby sense the condition of the power line. The base-emitter junctions are reversed biased by the pulsating voltage across the diodes, and a timing network, including a resistor across the power supply and a capacitor across the diodes, maintains the reverse biased condition of the junctions between the voltage pulses.

REFERENCES:
patent: 2863038 (1958-12-01), Lombardo
patent: 3739226 (1973-06-01), Seiter et al.
patent: 4001803 (1977-01-01), Lombardo
patent: 4071749 (1978-01-01), Balogh

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