Patent · US Active

Electronic ballast and method for operating an electrical lamp

US8558459B2 · kind B2 · utility

1Cited by

5References

20Claims

0Family size

Assignee

OSRAM Gesellschaft mit beschraenkter Haftung · DE

Inventors

Olaf Busse · Munich, DE
Bernhard Schemmel · Weßling, DE

Key dates

Filing date	Mar 5, 2007
Grant date	Oct 15, 2013
Priority date	—
Expiry date	Apr 17, 2029

Classification

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

Abstract

An electronic ballast for an electrical lamp (2) provided with a first (21) and a second filament (22), includes a heating device which is used to heat the filaments (21, 22) and includes a resonance circuit (5), and an evaluation unit (11) designed for the evaluation of at least one measuring value of an electrical parameter during pre-determinable adjustments of operating conditions of the resonance circuit (5). The number of filaments (21, 22) of the electrical lamp (2) in electrical contact with the electronic ballast (1) can be identified according to the measuring value, and the electrical lamp (2) can be switched on by the electronic ballast (1) according to the identified number. A method for operating an electrical lamp by an electronic ballast is also described.

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