Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Pulsating or a.c. supply to the cathode or heater circuit
Patent
1995-09-06
1997-01-07
Pascal, Robert
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Pulsating or a.c. supply to the cathode or heater circuit
315106, 315107, 315200R, 315209R, 315276, 315224, H05B 3900
Patent
active
055920543
ABSTRACT:
Disclosed is a power-level selection circuit in combination with a lamp circuit including a fluorescent lamp having first and second cathodes with resistive-heating filaments each spaced at a respective end of a lamp tube; first and second power leads for respectively connecting the cathodes to an a.c. power source whose power can be selectively enabled and interrupted by a main power switch; and a ballast inductor in serial circuit with one of the power leads and including a plurality of filament-heating windings for supplying power to the cathodes. The power-level selection circuit is interposed between a first cathode and a filament-heating winding, and includes a power-receiving circuit coupled to the filament-heating winding to receive power therefrom. Further included is a filament-supply circuit for continuously supplying available power to the first cathode. A selectable-impedance circuit is serially coupled between the first power lead and the first cathode and is responsive to a predetermined duration of interruption of power from the a.c. source to the power leads for selecting a different impedance of the selectable-impedance circuit, thereby selecting a different power level of the lamp.
REFERENCES:
patent: 4928038 (1990-05-01), Nerone
patent: 5250877 (1993-10-01), Fisher
patent: 5483125 (1996-01-01), Kachmarik et al.
Hammer Edward E.
Nerone Louis R.
Sanchez Maria
General Electric Company
Hawranko George E.
Pascal Robert
Philogene Haissa
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