EP 0948241 A3 20001227 - Method and apparatus for supplying power to light emitting diodes
Title (en)
Method and apparatus for supplying power to light emitting diodes
Title (de)
Verfahren und Vorrichtung zum Betreiben von Leuchtdioden
Title (fr)
Procédé et appareil pour alimenter des diodes électroluminescentes
Publication
Application
Priority
FI 980717 A 19980330
Abstract (en)
[origin: EP0948241A2] The invention relates to a method and an apparatus for supplying power to light emitting diodes connected to a light emitting diode matrix (MN) comprising one or more parallel connected light emitting diodes or a series connection thereof. The method comprises repeated phases where the amount of current in the main circuit formed of a series connection of the light emitting diode matrix (MN), a switching element (K1) and an inductance (N1) is monitored, the main circuit is opened by the switching element (K1) when the current of the main circuit reaches a predetermined value, whereby the current starts flowing through a zero diode circuit formed of a zero diode (D1) arranged on a circuit, the amount of current in the zero diode circuit is monitored, and the main circuit is closed by the switching element (K1) when the zero diode circuit current reaches a predetermined value. <IMAGE>
IPC 1-7
IPC 8 full level
H05B 33/08 (2006.01); H05B 44/00 (2022.01)
CPC (source: EP US)
H05B 45/382 (2020.01 - EP US)
Citation (search report)
- [Y] DE 4022498 A1 19920116 - STAHL R SCHALTGERAETE GMBH [DE]
- [Y] FR 2751805 A1 19980130 - SCHNEIDER ELECTRIC SA [FR]
- [Y] EP 0439151 A1 19910731 - HUGHES AIRCRAFT CO [US]
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0948241 A2 19991006; EP 0948241 A3 20001227; FI 104034 B1 19991029; FI 104034 B 19991029; FI 980717 A0 19980330; FI 980717 A 19991001
DOCDB simple family (application)
EP 99660053 A 19990325; FI 980717 A 19980330