EP 2499881 B1 20190109 - METHOD AND CIRCUIT FOR GENERATING OF MIXED LED LIGHT HAVING A PREDETERMINED COLOUR
Title (en)
METHOD AND CIRCUIT FOR GENERATING OF MIXED LED LIGHT HAVING A PREDETERMINED COLOUR
Title (de)
VERFAHREN UND SCHALTUNGSANORDNUNG ZUR ERZEUGUNG VON LED-MISCHLICHT VORBESTIMMTER FARBE
Title (fr)
PROCÉDÉ ET CIRCUITERIE PERMETTANT DE PRODUIRE UNE LUMIÈRE LED MIXTE D'UNE COULEUR PRÉDÉFINIE
Publication
Application
Priority
- DE 102009052390 A 20091109
- EP 2010058479 W 20100616
Abstract (en)
[origin: WO2011054547A1] The invention relates to a method for operating a range of LEDs preferably fed with constant current, which range of LEDs generates preferably white mixed light with at least two LED types of different spectrum, wherein the movement of the color locus of the mixed light, which is caused by the different negative gradients of the temperature dependencies of the intensity of at least two different LED types, is reduced by circuitry without using measurements and feedback variables.
IPC 8 full level
H05B 44/00 (2022.01)
CPC (source: EP US)
H05B 45/20 (2020.01 - EP US)
Citation (examination)
- WO 2004047498 A1 20040603 - FRIIS DAN [DK]
- US 2007171159 A1 20070726 - LEE DONG WOO [KR]
- EP 2471347 A1 20120704 - CREE INC [US] & WO 2011037774 A1 20110331 - CREE INC [US], et al
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
DOCDB simple family (publication)
DE 102009052390 A1 20110512; CN 102668699 A 20120912; CN 102668699 B 20150902; EP 2499881 A1 20120919; EP 2499881 B1 20190109; US 2012248995 A1 20121004; US 9137871 B2 20150915; WO 2011054547 A1 20110512
DOCDB simple family (application)
DE 102009052390 A 20091109; CN 201080050675 A 20100616; EP 10726063 A 20100616; EP 2010058479 W 20100616; US 201013508282 A 20100616