Discharge lamp ballast
AssigneeAltex Scientific, Inc.
InventorsLudovic S. Filgas, Jr., Haakon T. Magnussen, Jr.
Life of this patent
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Abstract
Circuit for starting and operating a gas discharge lamp. The circuit includes a resonant circuit having a high Q during both starting and operating conditions of the lamp, thereby permitting a high lamp operating voltage to be obtained from a relatively low voltage power supply. The circuit comprises a power supply, an inductor-capacitor series-resonant circuit connected across the power supply terminals, and a lamp circuit connected in parallel with the capacitor of the series-resonant circuit, wherein the lamp circuit comprises a second capacitor connected in series with a gas discharge lamp.
Claims4
Apparatus for starting and operating a gas discharge lamp comprising:
- power supply means for supplying an alternating voltage across two power supply terminals;
- a series-resonant circuit, connected across the two power supply terminals, comprising an inductor and a first capacitor connected in series;
- and
- a lamp circuit, connected in parallel with the first capacitor, comprising a second capacitor connected in series with a gas discharge lamp, the second capacitor having a substantially smaller capacitance than the first capacitor.
Dependencies are inferred from the claim text.