EP0695112B1 - Lumineszenzdiodenvorrichtung - Google Patents

Lumineszenzdiodenvorrichtung Download PDF

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Publication number
EP0695112B1
EP0695112B1 EP95401760A EP95401760A EP0695112B1 EP 0695112 B1 EP0695112 B1 EP 0695112B1 EP 95401760 A EP95401760 A EP 95401760A EP 95401760 A EP95401760 A EP 95401760A EP 0695112 B1 EP0695112 B1 EP 0695112B1
Authority
EP
European Patent Office
Prior art keywords
group
series
voltage
resistor
emitting diodes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95401760A
Other languages
English (en)
French (fr)
Other versions
EP0695112A1 (de
Inventor
Bernard Bardy
Vincent Thouzeau
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vibrachoc SAS
Original Assignee
Vibrachoc SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vibrachoc SAS filed Critical Vibrachoc SAS
Publication of EP0695112A1 publication Critical patent/EP0695112A1/de
Application granted granted Critical
Publication of EP0695112B1 publication Critical patent/EP0695112B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light

Definitions

  • the present invention relates to a mounting circuit light emitting diodes.
  • Light emitting diodes are used especially for lighting display panels, keyboards etc.
  • n chains are placed in parallel each comprising p light-emitting diodes placed in series.
  • the assembly is supplied with 28 volts direct current and, for control, there is also a variable DC voltage from 0 to 28 volts.
  • This control voltage supplies an electronic circuit whose output serves to polarize the base of a transistor put in series in each chain. With this command, the luminance curve, as a function of the supply voltage, of a tube circuit is roughly reproduced.
  • the present invention provides a circuit for mounting light emitting diodes for reproducing also the luminance curve as a function of the voltage supply to a tube circuit, in the case where no has only one variable DC voltage.
  • the present invention thus relates to a circuit for mounting light-emitting diodes supplied between a variable DC voltage from 0 to V volts and ground, characterized in that it comprises, connected in series, a first resistor R 1 and two groups of light emitting diodes connected in parallel, each group comprising at least one chain comprising P light emitting diodes connected in series, P possibly being equal to 1, in that a second resistor R 2 is furthermore arranged in series in one of the two groups, downstream of the group in the current flow direction, a third resistor R 3 being arranged in series in the other group, upstream of said group and in that a diode is connected between a first point located upstream of said second resistor R 2 and downstream of the group to which it belongs and a second point located downstream of the third resistor R 3 and upstream of the group to which it belongs, said diode assu rant the placing in series of the two groups when the voltage V 2 -V 3 between said first point and said second point reaches the threshold voltage of said dio
  • Figure 1 shows the assembly circuit according to the invention.
  • Figure 2 is a diagram equivalent to the circuit of the Figure 1 during low voltage power supplies.
  • Figure 3 is the same circuit as in Figure 1 but shown in a way more clearly showing the series of two groups of diodes electroluminescent when powering at higher high voltages, the diode being on.
  • Figure 4 shows the diode luminance curve electroluminescent mounted in the circuit according to the invention as a function of the supply voltage V, compared to that of a tube circuit.
  • FIG. 5 represents a preferred embodiment of the invention.
  • This circuit therefore comprises two groups 1 and 2 of light-emitting diodes 3 placed in series in each of the two groups.
  • the two groups connected in parallel, are arranged in series with a first resistance R 1 .
  • the circuit is supplied between ground and a variable DC voltage from 0 to 28 volts.
  • a second resistor R 2 is arranged in series downstream of the light-emitting diodes 3 of group 1 (considering the direction of current flow) and a third resistor R 3 is arranged in series, upstream of the light-emitting diodes 3 of group 2.
  • a diode 4 is connected between point 5 located between the last light-emitting diode 3 of group 1 and the second resistor R 2 and point 6 located between the third resistor R 3 and the first light-emitting diode 3 of group 2.
  • each group has a chain of four light emitting diodes 3 and that the voltage of threshold for light emitting diodes 3 and diode 4 is of 2 volts.
  • diode 4 At low supply voltages, diode 4 is blocked and the circuit is equivalent to a circuit of two groups 1 and 2 connected in parallel as shown in figure 2.
  • the voltage at point 6 remains practically constant at 8 volts (4 x 2 volts ) as soon as the threshold voltage of the light-emitting diodes 3 is reached.
  • the intensity increases in the single chain of group 2 and the voltage drop increases at the terminals of R 3 .
  • the voltage increases since the voltage drop is constant in the light-emitting diodes 3 and equal to approximately 8 volts.
  • the circuit proposed is equivalent to a circuit of two mounted groups in parallel, which reduces the threshold voltage of each group of light-emitting diodes ( ⁇ 8 volts).
  • Diode 4 being blocked and when the voltage power supply becomes higher and up to 28 volts, the circuit is equivalent to a circuit of two groups 1 and 2 in series ( Figure 3). Consumption is thus limited. The diode 4 is then on.
  • the characteristics of the luminance curve are adjusted to get as close as possible to the luminance curve of a tube circuit.
  • Curve L in Figure 4 shows schematically the luminance curve of a tube circuit as a function of the supply voltage.
  • the curves S-P and S represent the curve of luminance in the case of the present invention as a function of the supply voltage: the S-P curve corresponds to the phase where diode 4 is blocked and curve S at phase where LED 4 is on.
  • the choice of the value of the resistors R 1 , R 2 and R 3 makes it possible to follow more or less the curve L of a tube circuit.
  • the number P can moreover be equal to 1.
  • transverse links 9 ensuring a grid of all the chains of the group.

Landscapes

  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Claims (2)

  1. Lumineszenzdiodenvorrichtung (3), die mit einer zwischen 0 bis 28 V variablen Gleichstromspannung gegenüber der Erdung gespeist wird,
    dadurch gekennzeichnet,
    daß sie einen in Serie geschalteten ersten Widerstand R1 und zwei parallel angeschlossene Gruppen (1, 2) von Lumineszenzdioden umfaßt, von denen jede Gruppe mindestens eine Kette aufweist, die P in Serie geschaltete Lumineszenzdioden (3) umfaßt, wobei P gleich 1 sein kann, daß darüber hinaus ein in Serie geschalteter zweiter Widerstand R2 in einer der zwei Gruppen in Stromrichtung hinter der Gruppe vorgesehen ist, ein dritter Widerstand R3 in Serie in der anderen Gruppe vor dieser Gruppe vorgesehen ist, und daß eine Diode (4) zwischen einem ersten Punkt (5), der sich vor dem zweiten Widerstand R2 und hinter der Gruppe befindet, zu der der Widerstand gehört, und einem zweiten Punkt (6) geschaltet ist, der sich hinter dem dritten Widerstand R3 und vor der Gruppe befindet, zu der der Widerstand gehört, wobei diese Diode (4) die Serienschaltung der zwei Gruppen (1, 2) gewährleistet, wenn die Spannung V2-V3 zwischen dem ersten Punkt (5) und dem zweiten Punkt (6) die Grenzspannung dieser Diode (4) erreicht.
  2. Lumineszenzdiodenvorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, daß jede Gruppe n parallel geschaltete Ketten umfaßt.
EP95401760A 1994-07-29 1995-07-25 Lumineszenzdiodenvorrichtung Expired - Lifetime EP0695112B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9409429A FR2723286B1 (fr) 1994-07-29 1994-07-29 Circuit de montage de diodes electroluminescentes
FR9409429 1994-07-29

Publications (2)

Publication Number Publication Date
EP0695112A1 EP0695112A1 (de) 1996-01-31
EP0695112B1 true EP0695112B1 (de) 1999-10-13

Family

ID=9465892

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95401760A Expired - Lifetime EP0695112B1 (de) 1994-07-29 1995-07-25 Lumineszenzdiodenvorrichtung

Country Status (3)

Country Link
EP (1) EP0695112B1 (de)
DE (1) DE69512720T2 (de)
FR (1) FR2723286B1 (de)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2745458B1 (fr) * 1996-02-28 1998-04-10 Valeo Electronique Perfectionnement aux circuits d'illumination a diodes electroluminescentes, notamment pour vehicules automobiles, feu de signalisation et tableau de commande l'incorporant
US6885035B2 (en) * 1999-12-22 2005-04-26 Lumileds Lighting U.S., Llc Multi-chip semiconductor LED assembly
DE10032840A1 (de) * 2000-07-06 2002-01-17 Sick Ag Optoelektronischer Sensor
FR2814906B1 (fr) * 2000-09-29 2003-06-27 Thomson Csf Dispositif de commande de moyens d'eclairage
US6653798B2 (en) 2000-09-29 2003-11-25 Aerospace Optics, Inc. Voltage dimmable LED display producing multiple colors
US6489728B2 (en) * 2000-09-29 2002-12-03 Aerospace Optics, Inc. Power efficient LED driver quiescent current limiting circuit configuration
US6650064B2 (en) 2000-09-29 2003-11-18 Aerospace Optics, Inc. Fault tolerant led display design
US6323598B1 (en) 2000-09-29 2001-11-27 Aerospace Optics, Inc. Enhanced trim resolution voltage-controlled dimming led driver
FR2821520B1 (fr) * 2001-02-23 2003-08-29 Thomson Csf Dispositif de commande d'eclairage de diodes electroluminescentes
WO2007129131A1 (en) * 2006-05-10 2007-11-15 Nokia Corporation Apparatus having supply voltage adaptive light emitting component circuitry country and method of controlling
DE102006029957A1 (de) * 2006-06-29 2008-01-03 Osram Opto Semiconductors Gmbh Beleuchtungseinrichtung
US7906915B2 (en) 2008-04-19 2011-03-15 Aerospace Optics, Inc. Enhanced trim resolution voltage-controlled dimming LED driving circuit
US8466627B2 (en) 2008-07-30 2013-06-18 Koninklijke Philips N.V. Device with light-emitting diode circuits
KR101618583B1 (ko) * 2008-10-02 2016-05-09 코닌클리케 필립스 엔.브이. 플리커 성능이 개선된 ｌｅｄ 회로 장치
WO2012052893A1 (en) 2010-10-19 2012-04-26 Koninklijke Philips Electronics N.V. Led circuit arrangement
EP3837926B1 (de) * 2018-08-17 2023-11-15 Signify Holding B.V. Led-ansteuerungsschaltung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3622025C1 (en) * 1986-07-01 1987-10-15 Tele Security Foto Ueberwachun Infrared luminaire

Also Published As

Publication number Publication date
FR2723286A1 (fr) 1996-02-02
DE69512720D1 (de) 1999-11-18
DE69512720T2 (de) 2000-06-08
EP0695112A1 (de) 1996-01-31
FR2723286B1 (fr) 1996-09-13

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