Patent Number: 6,674,248

Title: Electronic ballast

Abstract: An electronic ballast for driving a gas discharge lamp includes a rectifier, a valley-fill circuit, an inverter having first and second series-connected controllably conductive device having complementary duty cycles, a control circuit for controlling the controllably conductive device, and an independent cat ear power supply to provide power to the ballast control circuits. The result is a ballast having substantially improved THD, and current crest factor. In a preferred embodiment, the valley-fill circuit includes an energy storage device that stores energy in response to a controllably conductive device. In an especially preferred embodiment, the controllably conductive device of the valley-fill circuit is also one of the controllably conductive devices of the inverter.

Inventors: Newman, Jr.; Robert C. (Emmaus, PA), DeJonge; Stuart (Riegelsville, PA), Taipale; Mark (Harleysville, PA), Travaglini; Dominick (Doylestown, PA), Spira; Joel S. (Coopersburg, PA)

Assignee: Lutron Electronics Co., Inc.

International Classification: H05B 41/28 (20060101); H05B 41/282 (20060101); H05B 041/16 (); H05B 037/02 ()

Expiration Date: 01/06/2021