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:
Feb. 02, 2016
Filed:
Oct. 25, 2013
Koninklijke Philips N.v., Eindhoven, NL;
Berend Jan Willem Ter Weeme, Eindhoven, NL;
William Peter Mechtildis Marie Jans, Born, NL;
Theo Gerrit Zijlman, Tilburg, NL;
Gazi Akdag, Maaseik, BE;
Erik MartinusHubertus Petrus Van Dijk, Den Bosch, NL;
Paul Johannes Marie Julicher, Neer, NL;
Bertrand Johan Edward Hontele, Breda, NL;
KONINKLIJKE PHILIPS N.V., Eindhoven, NL;
Abstract
In a lighting device, sets of LEDs are employed using the natural characteristics of the LEDs to resemble incandescent lamp behavior when dimmed, thereby obviating the need for sophisticated controls. A first set of at least one LED produces light with a first color temperature, and a second set of at least one LED produces light with a second color temperature. The first set and the second set are connected in series, or the first set and the second set are connected in parallel, possibly with a resistive element in series with the first or the second set. The first set and the second set differ in temperature behavior, or have different dynamic electrical resistance. In various embodiments, the sum of the currents provided to the first and second sets may be substantially equal to a magnitude of an input current.