Patent · US Active

Electronic ballast and method for operating an electric lamp

US7863830B2 · kind B2 · utility

1Cited by

4References

19Claims

0Family size

Assignee

OSRAM Gesellschaft mit beschraenkter Haftung · DE

Inventors

Bernhard Schemmel · Weßling, DE
Kay Schmidtmann · Birkenfeld, DE

Key dates

Filing date	Oct 12, 2006
Grant date	Jan 4, 2011
Priority date	—
Expiry date	Jan 19, 2028

Classification

Technology area (CPC H)Electricity
CPC primaryH05B41/295
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The invention relates to an electronic ballast device for operating an electric lamp (2), comprising a first (21) and a second lamp filament (22), wherein the lamp filaments (21, 22) are electrically connected to a heating circuit (3) during a pre-warming phase for the electric lamp (2) said heating circuit (3) being of such a form that the heating current generated by the heating circuit (3) during an operational phase of the electric lamp (2) amounts to between 20% and 60% of the lamp current of said electric lamp (2). The invention further relates to a method for operation of an electric lamp with an electronic ballast device.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.