Lutron Electronics Company, Inc.

Elster Solutions, LLC

Mark Charles Fischer

Mark Stephen Taipale

Dragan Veskovic

Jecko Arakkal

Brent M Gawrys

Kenneth C Shuey

Jecko J Arakkal

A linear transformer power supply is disclosed that extracts a high level of energy from a linear transformer during the full cycle of AC input voltage.

Linear transformer power supply

An electronic dimming ballast comprises a filament turn-off circuit for controlling the magnitudes of filament voltages supplied to the filaments of a gas discharge lamp. Each of a plurality of filament windings is directly coupled to one of the filaments and is operable to supply a small AC filament voltage to the filaments. The plurality of filament windings and a control winding are loosely magnetically coupled to a resonant inductor of an output circuit of the ballast. A controllably conductive device is coupled across the control winding. When the controllably conductive device is conductive, the voltage across the control winding and the filament windings falls to zero volts. The controllably conductive device is driven with a pulse-width modulated (PWM) signal so as to control the magnitudes of the filament voltages. The filament voltages are provided to the filaments before striking the lamp, and when dimming the lamp near low end.

Apparatus and method for controlling the filament voltage in an electronic dimming ballast

Growing community of inventors

Siler City, NC, United States of America

Mark Charles Fischer