Method for pre-heating a gas-discharge lamp

Details Method for pre-heating a gas-discharge lamp Method for pre-heating a gas-discharge lamp

1993-12-22

1995-06-13

Pascal, Robert J.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

315209R, 315224, 315307, 315DIG5, 315DIG7, 315106, H05B 3900

Patent

active

054246113

ABSTRACT:
Two methods are disclosed for providing a warm-up or pre-heat period for a gas-discharge lighting system, such as a fluorescent light. One method provides current to the lamp for a predetermined period of time to heat the filaments therein without significant ionization of the lamp. The second method provides current to the lamp to heat the filaments without significant ionization of the lamp until the voltage across the filament reaches a predetermined voltage. After the lamp is pre-heated, the current is increased to ionize the lamp.

REFERENCES:
patent: 4949013 (1990-08-01), Zuchtriegel
patent: 4952842 (1990-08-01), Bolhuis et al.
patent: 5049790 (1991-09-01), Herfurth et al.
patent: 5122712 (1992-06-01), Hirschmann
"Telefunken Application Note", (Date Unknown) pp. 1 through 6.
"Electronic Ballasts", PCIM, Apr. 1987, R. J. Haver, Motorola, Inc., pp. 52 through 56 and 58.
"International Rectifier Application Note 973", (Date Unknown) Peter N. Wood, pp. 229 through 236.
"1.9 Electronic ballast for flourescent lamps", Siemens (?), (Date Unknown) p. 34.

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