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:
Apr. 15, 2008
Filed:
Nov. 14, 2002
Applicant:
Oscar Jan Deurloo, Eindhoven, NL;
Inventor:
Oscar Jan Deurloo, Eindhoven, NL;
Assignee:
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B 37/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method for dimming a gas discharge lamp, such as an HID lamp including an MH lamp, includes operating the lamp at nominal power with commutating DC current having a current magnitude I=αI, α being equal to 1 or less than 1. The current magnitude Iis reduced, but the lamp still is operated at commutating DC current, until α reaches a predetermined value β. Then, the lamp is operated at DC current, and the current magnitude is reduced further, thus achieving a lower dimming level.