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US 4,233,541 AGranted
Start winding for solenoidal electric field discharge lamps
AssigneeGeneral Electric Company
InventorArmand P. Ferro
Life of this patent
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Abstract
Efficient starting of solenoidal electric field discharge lamps is effected with a start winding disposed on the same core with the ballast reactance. This placement of the start winding possesses certain advantages over other methods of lamp starting, and in particular it facilitates hot restart of the lamp.
Claims8
A solenoidal electric field lamp apparatus comprising:
- a light-transmissive evacuable envelope containing an ionizable gaseous medium and having a phosphor disposed on said envelope for absorption of electromagnetic radiation at a first optical frequency from said medium and reradiation of electromagnetic radiation at a second optical frequency;
- a magnetic lamp core electromagnetically coupled to said medium, said core having a conductive winding thereon;
- an electronic ballast circuit for supplying radio frequency energy;
- means for providing ballast reactance for said ballast circuit;
- a transformer having a core, a primary winding electromagnetically coupled to said ballast circuit and a secondary winding coupled to said lamp core;
- and
- a start winding disposed on a magnetic core and connected to act as an autotransformer with said transformer secondary winding and being futher connected to a starting electrode disposed proximal to said gaseous medium.
4 more elements
Dependencies are inferred from the claim text.