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US 5,497,052 AGranted
Isolated constant wattage lamp ballast
AssigneeMagneTek, Inc.
InventorPaul J. Buckley, II
Life of this patent
Estimating the term…
Abstract
A constant wattage ballast transformer of the isolated type permitting the electrical grounding of a mounting shell of the lamp it powers in which a primary, secondary and auxiliary winding are provided with the primary winding inducing voltage into the auxiliary and secondary windings while being electrically isolated from both these windings and the auxiliary winding electrically connected to the secondary winding to add its induced voltage to that directly induced in the secondary winding from the primary winding.
Claims16
An isolated constant wattage autotransformer ballast for an HID lamp comprising:
- a primary winding for connection to a source voltage,
- a secondary winding,
- means for magnetically coupling said primary winding to said secondary winding to induce a voltage into said secondary winding from said primary winding, said primary and secondary windings being electrically isolated,
- an auxiliary winding electrically isolated from said primary winding and positioned with respect to said magnetic coupling means to be closely coupled to said primary winding so as to induce a voltage from said primary winding to said auxiliary winding, and
- means for electrically connecting one end of said auxiliary winding to one end of said secondary winding to add the voltage induced in said auxiliary winding from said primary winding to the voltage induced in said secondary winding from said primary winding, the additive voltage of said auxiliary winding and said secondary winding present between the other ends of said auxiliary and secondary windings being available to operate the HID lamp.
2 more elements
Dependencies are inferred from the claim text.