Hybrid sequence start ballast for an instant start discharge lam

Details Hybrid sequence start ballast for an instant start discharge lam Hybrid sequence start ballast for an instant start discharge lam

1995-02-24

1998-03-24

Pascal, Robert

Electric lamp and discharge devices: systems

Plural load device systems

Sequential starting

315289, 315DIG5, 315119, 315227R, H05B 4114

Patent

active

057316678

ABSTRACT:
In accordance with the present invention, a hybrid sequence start circuit is provided for operating a plurality of instant start lamps. The circuit utilizes two coils, a primary and a secondary, and an electronic switch to start a plurality of series-connected, instant start lamps in sequence. When the circuit is energized, the electronic switch causes open circuit voltage to be applied to a first lamp by placing a low impedance across the other lamps, causing the first lamp to strike. The first lamp then conducts current, causing a starting capacitor in parallel with a second lamp to be charged, eventually, causing the second lamp to strike. The current through the second lamp shunts current away from the switch, and when this current drops below a predefined threshold level, the switch opens, effectively removing both the low impedance and the starting capacitor from the circuit.

REFERENCES:
patent: 4006384 (1977-02-01), Elms et al.
patent: 4145638 (1979-03-01), Kaneda
patent: 4211958 (1980-07-01), Bickford et al.
patent: 4425530 (1984-01-01), Hammer et al.
patent: 4547705 (1985-10-01), Hirayama et al.
patent: 4562381 (1985-12-01), Hammer et al.

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