Program start ballast

Details Program start ballast Program start ballast

2007-05-11

2008-12-02

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S244000, C315S224000, C315S360000, C315S2090SC, C315S128000, C315SDIG002, C315SDIG002

Reexamination Certificate

active

07459867

ABSTRACT:
A ballast (10) for powering at least one gas discharge lamp (70) in a program start mode comprises an inverter (200), a resonant output circuit (400), and a control circuit (600). During operation of ballast (10), control circuit (600) monitors a voltage within resonant output circuit (400). When the monitored voltage reaches a first specified level that is indicative of sufficient filament preheating, control circuit (600) maintains the inverter operating frequency at a first present value for a preheating period so as to provide preheating of lamp filaments (72,74). Following completion of the preheating period, control circuit (600) allows the inverter operating frequency to decrease. When the monitored voltage reaches a second specified level that is indicative of sufficient ignition voltage, control circuit (600) maintains the inverter operating frequency at a second present value for an ignition period so as to provide ignition of lamp (70).

REFERENCES:
patent: 5049790 (1991-09-01), Herfurth et al.
patent: 5650694 (1997-07-01), Jayaraman et al.
patent: 5945788 (1999-08-01), Li et al.
patent: 6720739 (2004-04-01), Konopka
patent: 7312588 (2007-12-01), Yu et al.

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