The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 02, 2010
Filed:
Dec. 21, 2005
Jens Pollmann-retsch, Aachen, DE;
Jens Pollmann-Retsch, Aachen, DE;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A lighting assembly, a driver circuit, and a method of operating a discharge lamp are described. A discharge lamp () comprises a discharge vessel () with at least two electrodes () arranged at a distance d for generating an arc between the electrode (). Driver electronics () operate the lamp () with electrical power. In order to reduce electrode burn-back, the driver electronics operate the lamp according to a switch-off sequence, which includes a power ramp interval () where the lamp () is operated with increasing electrical power over time, and subsequently the lamp () is switched-off. Also, the driver electronics () operate the lamp according to a turn-on sequence upon turning on the lamp () with a first turn-on interval (), where the lamp is operated with electrical power increasing up to an initial maximum power value, and a power ramp interval () during which the lamp is operated with electrical power increasing over time from the initial maximum power value to nominal power P. The initial maximum power value is less than the nominal power value of the lamp.