Two light level ballast

Details Two light level ballast Two light level ballast

2007-05-15

2007-05-15

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S279000, C315S276000, C315S274000

Reexamination Certificate

active

11139068

ABSTRACT:
A ballast (100) for powering at least one gas discharge lamp (30) at two selectable light levels includes a sensing transformer (120) and a detector circuit (200). Detector circuit (200) provides an output voltage that is dependent on the states of two on-off switches (S1,S2) interposed between the ballast (100) and a conventional AC source (20). The output voltage of the detector circuit (200) is used to control the illumination level of the lamp (30).

REFERENCES:
patent: 4052751 (1977-10-01), Shepard
patent: 5177409 (1993-01-01), Nilssen
patent: 5194781 (1993-03-01), Konopka
patent: 5373218 (1994-12-01), Konopka et al.
patent: 5475285 (1995-12-01), Konopka
patent: 5831395 (1998-11-01), Mortimer et al.

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