Electric lamp and discharge devices: systems – Plural load device systems – Sequential starting
Patent
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.
Luchetta Julius Frank
Martin Chad
Rajan Ramkumar
Kinkead Arnold
MagneTek, Inc.
Pascal Robert
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