Stepped dimming ballast for fluorescent lamps

Details Stepped dimming ballast for fluorescent lamps Stepped dimming ballast for fluorescent lamps

2007-08-21

2007-08-21

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S194000, C315S2090SC, C315SDIG002

Reexamination Certificate

active

11435841

ABSTRACT:
A stepped dimming ballast comprising a filter and rectifier circuit (1), a DC high voltage stabilizing circuit (2), a frequency control and switch circuit (3), a load current feedback circuit (5), a voltage signal processing circuit (6) and a voltage signal sampling circuit (7). The present invention is adapted for use in conjunction with a silicon controlled rectifier dimmer and/or a regular light switch whereby it is novel in structure and able to effect dimming in two predetermined and reliable operation modes.

REFERENCES:
patent: 5471119 (1995-11-01), Ranganath et al.
patent: 5754036 (1998-05-01), Walker
patent: 5872429 (1999-02-01), Xia et al.
patent: 6486616 (2002-11-01), Liu et al.
patent: 2005/0134196 (2005-06-01), Cook et al.

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