Ballast control circuit

Details Ballast control circuit Ballast control circuit

2006-11-02

2008-10-14

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S224000, C315S2090SC

Reexamination Certificate

active

07436127

ABSTRACT:
A ballast control circuit having a bridge driver for driving a transistor bridge of a ballast circuit coupled to a resonant ballast output stage including a lamp, the ballast control circuit comprising a circuit for setting a minimum oscillation frequency and a voltage controlled oscillation circuit having a first input, wherein as a voltage at the first input increases, modes of the circuit change from a preheat mode where the frequency of oscillation moves from a first frequency to a lower preheat frequency and continues at a substantially constant preheat frequency for a set duration of preheat time, to an ignition mode where the frequency moves lower towards a resonance frequency of the ballast output stage until the lamp ignites, and to a run mode where the frequency stops decreasing and stays at the minimum set frequency.

REFERENCES:
patent: 5742134 (1998-04-01), Wacyk et al.
patent: 6008590 (1999-12-01), Giannopoulos et al.
patent: 6020689 (2000-02-01), Gradzki et al.
patent: 6211623 (2001-04-01), Wilhelm et al.
patent: 6531831 (2003-03-01), Chou et al.
patent: 6717375 (2004-04-01), Noguchi et al.
patent: 7239094 (2007-07-01), Radzinski et al.

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