Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1994-09-15
1995-08-22
Pascal, Robert J.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315209M, 315227R, 315242, 315220, 315289, H05B 3702
Patent
active
054443342
ABSTRACT:
A ballast circuit arrangement with hot restrike capabilities includes an input transformer having a primary winding receptive of line power and a secondary winding over which an output voltage is made available. A first capacitor coupled across the secondary winding of the input transformer develops a voltage charge thereon. A resistor and a second capacitor are series connected to one another and are parallel coupled across the first capacitor. A starting aid device is coupled to the secondary winding of the input transformer and produces an output voltage of a predetermined magnitude. The output voltage of the starting aid is coupled to a spark gap device having first, second and third electrodes associated therewith. A first spark gap formed between the second and third electrode is first fired by the output voltage of the starting aid which in turn triggers the firing of a second spark gap formed between the first and second electrodes. A pulse transformer having a primary winding coupled between the spark gap device and the series connection between the resistor and second capacitor provides a discharge path for the second capacitor. Upon the firing of the second spark gap, the primary winding of the pulse transformer produces a starting pulse through a secondary winding of the pulse transformer. The starting pulse is effective for starting the discharge lamp under predetermined conditions including a condition where it is desired to restart the discharge lamp immediately following the discharge lamp being extinguished.
REFERENCES:
patent: 4169445 (1979-10-01), Gerry
patent: 4369757 (1983-01-01), Anzai
patent: 5084800 (1992-01-01), Hijikata
Kiefer George E.
Speaker Lawrence W.
Corwin Stanley C.
General Electric Company
Hawranko George E.
Pascal Robert J.
Ratliff Reginald A.
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