Universal input warm-start linear ballast

Details Universal input warm-start linear ballast Universal input warm-start linear ballast

1998-02-12

2000-02-29

Philogene, Haissa

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315224, 315209R, 315DIG7, 361 57, G05F 100

Patent

active

060313420

ABSTRACT:
An electronic ballast for a fluorescent lamp which includes a frequency sweep circuit for driving a ballast controller IC at different operating frequencies depending on the operating mode of the fluorescent lamp. The sweep circuit monitors the operating mode of the lamp (e.g., preheat, ignite, running, shutdown) and automatically generates an appropriate variable voltage offset for controlling the lamp. The offset is added to a constant voltage supplied to an input of the ballast controller IC, resulting in a corresponding change in the frequency output by the ballast controller IC (and thus the lamp power). The electronic ballast also includes fault protection logic which monitors signals from the lamp resonant circuit and shuts down the ballast in the event of a fault condition. The fault protection logic also resets the frequency sweep circuit so that the lamp can restart automatically when the fault is corrected.

REFERENCES:
patent: 4210846 (1980-07-01), Capewell et al.
patent: 4907116 (1990-03-01), Aschwanden et al.
patent: 5410221 (1995-04-01), Mattas et al.
patent: 5545955 (1996-08-01), Wood

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