EP 0695112 B1 19991013 - Circuit containing light emitting diodes
Title (en)
Circuit containing light emitting diodes
Title (de)
Lumineszenzdiodenvorrichtung
Title (fr)
Circuit de montage de diodes électroluminescentes
Publication
Application
Priority
FR 9409429 A 19940729
Abstract (en)
[origin: EP0695112A1] The circuit includes two groups (1,2) of LEDs (3). The group (1) has the LEDs preceding a series resistor (R2) and group (2) is preceded by a series resistor (R3). The two groups of LEDs are bridged together at points (5,6) by a forward biassed diode (4). The voltage supply is typically 0-28 V. At low supply voltages, the leds operate in parallel. When the potential difference across the diode (4) passes the bias threshold, all the leds are placed in series. The change in intensity with voltage enables the array to follow the graph for a filament lamp by suitable choice of resistance (R1, R2, R3). <IMAGE>
IPC 1-7
IPC 8 full level
H05B 44/00 (2022.01)
CPC (source: EP US)
H05B 45/10 (2020.01 - EP US); H05B 45/44 (2020.01 - EP US)
Designated contracting state (EPC)
DE FR IT
DOCDB simple family (publication)
EP 0695112 A1 19960131; EP 0695112 B1 19991013; DE 69512720 D1 19991118; DE 69512720 T2 20000608; FR 2723286 A1 19960202; FR 2723286 B1 19960913
DOCDB simple family (application)
EP 95401760 A 19950725; DE 69512720 T 19950725; FR 9409429 A 19940729