Relay circuit for providing power from a normal or emergency pow

Details Relay circuit for providing power from a normal or emergency pow Relay circuit for providing power from a normal or emergency pow

1997-06-24

1999-09-21

Wong, Don

Electric lamp and discharge devices: systems

Automatic substitution of the power supply

315160, 307 64, H05B 3700

Patent

active

059558431

ABSTRACT:
An apparatus and method for supplying emergency power to a lighting device, in particular, an HID lamp, when a failure occurs in a main power supply. The apparatus can include a rectifier circuit for converting an AC voltage signal provided by the main power supply to a DC voltage signal. A capacitive element can be coupled across the DC output terminals of the rectifier circuit and across a DC coil of a DC relay circuit. The amount of energy stored by the capacitor controls the DC relay to provide the voltage of the main power supply to the lamp circuit under normal conditions, and the voltage of an emergency power supply to the lamp circuit when the voltage of the main power supply falls below a predetermined level. Alternatively, an AC relay can be coupled directly to the main AC voltage power supply or emergency power supply and configured to perform a similar operation.

REFERENCES:
patent: 2997631 (1961-08-01), Moakler
patent: 3808451 (1974-04-01), Pittet
patent: 3904920 (1975-09-01), Griffith
patent: 4057750 (1977-11-01), Elms et al.
patent: 4686379 (1987-08-01), Ohnari
patent: 4686424 (1987-08-01), Nuckolls et al.
patent: 4890041 (1989-12-01), Nuckolls et al.
patent: 5047694 (1991-09-01), Nuckolls et al.

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