EP 2201821 A2 20100630 - OPERATING CIRCUIT FOR LIGHT-EMITTING DIODES AND METHOD FOR OPERATING LIGHT-EMITTING DIODES
Title (en)
OPERATING CIRCUIT FOR LIGHT-EMITTING DIODES AND METHOD FOR OPERATING LIGHT-EMITTING DIODES
Title (de)
BETRIEBSSCHALTUNG FÜR LEUCHTDIODEN UND VERFAHREN ZUM BETRIEB VON LEUCHTDIODEN
Title (fr)
CIRCUIT PERMETTANT DE FAIRE FONCTIONNER DES DIODES ÉLECTROLUMINESCENTES ET PROCÉDÉ PERMETTANT DE FAIRE FONCTIONNER DES DIODES ÉLECTROLUMINESCENTES
Publication
Application
Priority
- EP 2008008729 W 20081015
- DE 102007049533 A 20071016
Abstract (en)
[origin: WO2009049876A2] The present invention relates to an operating circuit for at least one light-emitting diode (7), having a switched-mode regulator circuit, which is supplied with a DC voltage and uses a switch (5) clocked by a control unit (13) to provide a supply voltage for the at least one light-emitting diode (7), and a current sensor (6, 12), connected to the control unit (13), for sensing the current flowing through the at least one light-emitting diode (7) during the turned-on phase (E) of the switch (5), the control unit (13) determining the period (toff) between the switch (5) being turned off and subsequently turned on on the basis of the current sensed by means of the current sensor (6, 12) during the turned-on phase (E). The present invention also relates to a method for operating at least one light-emitting diode (7).
IPC 8 full level
H05B 44/00 (2022.01)
CPC (source: AT EP US)
H05B 45/14 (2020.01 - AT EP US); H05B 45/3725 (2020.01 - AT EP US)
Citation (search report)
See references of WO 2009049876A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA MK RS
DOCDB simple family (publication)
DE 102007049533 A1 20090423; DE 102007049533 B4 20170223; AT 516957 A5 20161015; AT 516957 B1 20161015; CN 101828428 A 20100908; EP 2201821 A2 20100630; EP 2201821 B1 20170913; WO 2009049876 A2 20090423; WO 2009049876 A3 20090723; WO 2009049876 A9 20090611
DOCDB simple family (application)
DE 102007049533 A 20071016; AT 93222008 A 20081015; CN 200880112068 A 20081015; EP 08840612 A 20081015; EP 2008008729 W 20081015