Electric lamp and discharge devices: systems – With automatic shunt and/or cutout
Patent
1997-01-17
2000-02-29
Vu, David H.
Electric lamp and discharge devices: systems
With automatic shunt and/or cutout
315123, 315276, 307132R, H05B 3700
Patent
active
060313358
ABSTRACT:
An electrical power system to provide a selected voltage to a load such as a fluorescent lighting system is characterized by a winding 3 having a positive end connected to a positive rail and is tapped at a predetermined position for supplying an output terminal with a selected voltage. A first relay contact can electrically connect a neutral end of the winding to a neutral rail to provide one selected voltage or a second relay contact can electrically short-circuit a predetermined number of turns of the winding in response to a request for a second selected voltage. When a fault condition is monitored, a third relay contact can electrically short-circuit the neutral end of the winding to the predetermined position to put the system into a failsafe condition which prevents turns of the winding being open circuit.
REFERENCES:
patent: 4189664 (1980-02-01), Hirschfeld
patent: 4201938 (1980-05-01), Neumann
patent: 4237403 (1980-12-01), Davis
patent: 4513224 (1985-04-01), Thomas
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