Electric lamp and discharge devices: systems – Automatic substitution of the power supply
Patent
1985-01-28
1987-07-21
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Automatic substitution of the power supply
307 64, 307 66, 362 20, 362183, H05B 3700, H05B 4114
Patent
active
046820787
ABSTRACT:
A circuit is disclosed herein for use in series with a fluorescent lamp and a conventional ballast for supplying operating current to the lamp when the main line source of power has been interrupted. The circuit includes a sensor for detecting the lamp current and utilizes the lamp current for charging a storage battery via a battery charger. An inverter ballast circuit is normally maintained in an "OFF" condition by the sensor and is responsive to the sensor when the power source to the lamp has been interrupted so that the power from the battery is applied to the inverter ballast to turn it to the "ON" condition. Conduction of the inverter ballast circuit provides AC voltage to energize the fluorescent lamp through the conventional ballast.
REFERENCES:
patent: 3688123 (1972-08-01), Walker
patent: 3833817 (1974-09-01), Patel
patent: 4117373 (1978-09-01), Alley
patent: 4144462 (1979-03-01), Sieron et al.
patent: 4177500 (1979-12-01), Nicholl et al.
patent: 4297614 (1981-10-01), Chandler
patent: 4323820 (1982-04-01), Teich
patent: 4454452 (1984-06-01), Feldstein
Chatmon Saxfield
Marrs Roger A.
Radiant Illumination, Inc.
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