Multiple lamp ballast control circuit

Details Multiple lamp ballast control circuit Multiple lamp ballast control circuit

2008-04-01

2008-04-01

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Plural load device systems

C315S224000, C315S244000, C315S291000

Reexamination Certificate

active

11056748

ABSTRACT:
A ballast control circuit for multiple lamps comprising a ballast control circuit for driving two series connected switches of a lamp ballast connected across a supply potential and having a switched node between the switches; the switched node adapted to be connected to an output circuit comprising a plurality of parallel connected lamps; the control circuit comprising an oscillator, the output circuit comprising the plurality of parallel connected lamps including inductive and capacitive components and having a resonance frequency that is dependent on the number of lamps in the output circuit; a lamp output voltage being developed across the output circuit; further comprising a feedback circuit for controlling the oscillator whereby the oscillator sweeps from a first frequency above resonance to a lower frequency closer to resonance such that the output voltage increases to a potential above a lamp ignition threshold, thereby igniting at least one lamp; the feedback circuit controlling the oscillator whereby the oscillator frequency reduces each time a lamp ignites, causing the output voltage across the output voltage circuit to increase above the threshold, thereby igniting another of the lamps.

REFERENCES:
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patent: 6362575 (2002-03-01), Chang et al.
patent: 7061118 (2006-06-01), Masuda
patent: 7109665 (2006-09-01), Green

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