Electronic ballast for discharge lamps

Details Electronic ballast for discharge lamps Electronic ballast for discharge lamps

1997-10-27

1999-07-06

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315307, 315209R, 315244, 315DIG4, 363157, G05F 100

Patent

active

059201550

ABSTRACT:
An electronic ballast for discharge lamps comprises a main resonance circuit for applying a voltage necessary for operating of a discharge lamp having filaments to both ends of the discharge lamp and a filament resonance circuit for supplying a filament current to the filaments, wherein the main resonance circuit and filament resonance circuit have resonance circuits having different resonance characteristics in an output path leading to the discharge lamp and also change their outputs depending on an operating frequency of switching elements. Thereby a filament current and a voltage across the discharge lamp can be set at suitable one of respective operational modes of the discharge lamp according to an operational state of the discharge lamp.

REFERENCES:
patent: 4933605 (1990-06-01), Quazi et al.
patent: 5063490 (1991-11-01), Maehara et al.
patent: 5434479 (1995-07-01), Ohnishi et al.

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