Two light level ballast

Details Two light level ballast Two light level ballast

2006-08-01

2006-08-01

Phan, Tho (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S307000, C315S308000, C315S291000, C315S272000

Reexamination Certificate

active

07084579

ABSTRACT:
An electronic ballast (100) for powering at least one gas discharge lamp (30) at two light levels includes a full-wave rectifier circuit (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), but that is substantially unaffected by typical X capacitances that are present between the hot and neutral input connections of the ballast.

REFERENCES:
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: 5491624 (1996-02-01), Levran et al.
patent: 5831395 (1998-11-01), Mortimer et al.
patent: 6137239 (2000-10-01), Wu et al.
patent: 6177769 (2001-01-01), Bezdon et al.

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