EP0695112A1 - Lumineszenzdiodenvorrichtung - Google Patents

Lumineszenzdiodenvorrichtung Download PDF

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Publication number
EP0695112A1
EP0695112A1 EP95401760A EP95401760A EP0695112A1 EP 0695112 A1 EP0695112 A1 EP 0695112A1 EP 95401760 A EP95401760 A EP 95401760A EP 95401760 A EP95401760 A EP 95401760A EP 0695112 A1 EP0695112 A1 EP 0695112A1
Authority
EP
European Patent Office
Prior art keywords
emitting diodes
group
series
light
voltage
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.)
Granted
Application number
EP95401760A
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English (en)
French (fr)
Other versions
EP0695112B1 (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 circuit for mounting light-emitting diodes.
  • Light emitting diodes are used in particular for lighting display panels, keyboards, etc.
  • a mounting circuit is known in which the light-emitting diodes are grouped in series / parallel: 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 which also allows the luminance curve to be reproduced as a function of the supply voltage of a lamp circuit, in the case where only one variable DC voltage is available.
  • 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 R1 and two groups of diodes 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 R2 is furthermore arranged in series in one of the two groups, downstream of the group in the current flow direction, a third resistor R3 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 R2 and downstream of the group to which it belongs and a second point located downstream of the third resistor R3 and upstream of the group to which it belongs , said diode ensuring the series connection of the two groups when the voltage V2-V3 between said first point and said second point reaches the threshold voltage of said
  • FIG. 1 shows the mounting circuit according to the invention.
  • Figure 2 is a diagram equivalent to the circuit of Figure 1 during low voltage power supplies.
  • Figure 3 is the same circuit as that of Figure 1 but shown in a manner more clearly showing the series connection of the two groups of light-emitting diodes during power supplies at higher voltages, the diode being on.
  • FIG. 4 shows the luminance curve of the light-emitting diodes mounted in the circuit according to the invention as a function of the supply voltage V, compared with 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 R1.
  • the circuit is supplied between ground and a variable DC voltage from 0 to 28 volts.
  • a second resistor R2 is arranged in series downstream of the light-emitting diodes 3 of group 1 (considering the direction of current flow) and a third resistor R3 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 R2 and point 6 located between the third resistor R3 and the first light-emitting diode 3 of group 2.
  • each group comprises a chain of four light-emitting diodes 3 and that the threshold voltage of light-emitting diodes 3 and of diode 4 is 2 volts.
  • the diode 4 is blocked and the circuit is equivalent to a circuit of two groups 1 and 2 connected in parallel as shown in FIG. 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 across R bornes.
  • the voltage increases since the voltage drop is constant in the light-emitting diodes 3 and equal to approximately 8 volts.
  • the proposed circuit is equivalent to a circuit of two groups connected in parallel, which makes it possible to reduce the threshold voltage of each group of light-emitting diodes ( ⁇ 8 volts).
  • the diode 4 being blocked and when the supply voltage 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. 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.
  • the curve L in FIG. 4 schematically represents the luminance curve of a tube circuit as a function of the supply voltage.
  • the curves SP and S represent the luminance curve in the case of the present invention as a function of the supply voltage: the curve SP corresponds to the phase where the diode 4 is blocked and the curve S to the phase where the diode 4 is busy.
  • resistors R1, R2 and R3 make it possible to follow more or less the curve L of a tube circuit.
  • the number P can also be equal to 1.
  • they are connected by 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)
EP95401760A 1994-07-29 1995-07-25 Lumineszenzdiodenvorrichtung Expired - Lifetime EP0695112B1 (de)

Applications Claiming Priority (2)

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

Publications (2)

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

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2745458A1 (fr) * 1996-02-28 1997-08-29 Valeo Electronique Perfectionnement aux circuits d'illumination a diodes electroluminescentes, notamment pour vehicules automobiles, feu de signalisation et tableau de commande l'incorporant
WO2002028147A1 (fr) * 2000-09-29 2002-04-04 Thales Dispositif de commande de moyens d'eclairage
WO2002028148A3 (en) * 2000-09-29 2002-05-30 Aerospace Optics Inc Enhanced trim resolution voltage-controlled dimming led driver
FR2821520A1 (fr) * 2001-02-23 2002-08-30 Thomson Csf Dispositif de commande d'eclairage de diodes electroluminescentes
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
US6653798B2 (en) 2000-09-29 2003-11-25 Aerospace Optics, Inc. Voltage dimmable LED display producing multiple colors
WO2007129131A1 (en) * 2006-05-10 2007-11-15 Nokia Corporation Apparatus having supply voltage adaptive light emitting component circuitry country and method of controlling
WO2010038190A1 (en) * 2008-10-02 2010-04-08 Philips Intellectual Property & Standards Gmbh Led circuit arrangement with improved flicker performance
WO2010013173A3 (en) * 2008-07-30 2010-11-18 Philips Intellectual Property & Standards Gmbh Device with light-emitting diode circuits
US7906915B2 (en) 2008-04-19 2011-03-15 Aerospace Optics, Inc. Enhanced trim resolution voltage-controlled dimming LED driving circuit
US9000676B2 (en) 2010-10-19 2015-04-07 Koninklijke Philips N.V. LED circuit arrangement
WO2020035436A1 (en) * 2018-08-17 2020-02-20 Signify Holding B.V. Led driving circuit

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE102006029957A1 (de) * 2006-06-29 2008-01-03 Osram Opto Semiconductors Gmbh Beleuchtungseinrichtung

Citations (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

Patent Citations (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

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2745458A1 (fr) * 1996-02-28 1997-08-29 Valeo Electronique Perfectionnement aux circuits d'illumination a diodes electroluminescentes, notamment pour vehicules automobiles, feu de signalisation et tableau de commande l'incorporant
EP0793403A1 (de) * 1996-02-28 1997-09-03 Valeo Electronique Verbesserung von LED-Schaltungen, insbesondere für Kraftfahrzeuge, Stoplichter und Steuerungspanele
US6489728B2 (en) 2000-09-29 2002-12-03 Aerospace Optics, Inc. Power efficient LED driver quiescent current limiting circuit configuration
FR2814906A1 (fr) * 2000-09-29 2002-04-05 Thomson Csf Dispositif de commande de moyens d'eclairage
WO2002028148A3 (en) * 2000-09-29 2002-05-30 Aerospace Optics Inc Enhanced trim resolution voltage-controlled dimming led driver
WO2002028147A1 (fr) * 2000-09-29 2002-04-04 Thales Dispositif de commande de moyens d'eclairage
US6650064B2 (en) 2000-09-29 2003-11-18 Aerospace Optics, Inc. Fault tolerant led display design
US6653798B2 (en) 2000-09-29 2003-11-25 Aerospace Optics, Inc. Voltage dimmable LED display producing multiple colors
US6670776B2 (en) 2000-09-29 2003-12-30 Aerospace Optics, Inc. Enhanced trim resolution voltage-controlled dimming LED driver
US6737814B2 (en) 2000-09-29 2004-05-18 Aerospace Optics, Inc. Enhanced trim resolution voltage-controlled dimming LED driver
AU2001286138B2 (en) * 2000-09-29 2007-03-22 Aerospace Optics, Inc. Enhanced trim resolution voltage-controlled dimming led driver
FR2821520A1 (fr) * 2001-02-23 2002-08-30 Thomson Csf Dispositif de commande d'eclairage de diodes electroluminescentes
WO2003024158A1 (en) * 2001-09-07 2003-03-20 Aerospace Optics, Inc. Power efficient led driver quiescent current limiting circuit configuration
WO2007129131A1 (en) * 2006-05-10 2007-11-15 Nokia Corporation Apparatus having supply voltage adaptive light emitting component circuitry country and method of controlling
US7906915B2 (en) 2008-04-19 2011-03-15 Aerospace Optics, Inc. Enhanced trim resolution voltage-controlled dimming LED driving circuit
RU2563881C2 (ru) * 2008-07-30 2015-09-27 Конинклейке Филипс Электроникс Н.В. Устройство с цепями светоизлучающих диодов
CN102113411A (zh) * 2008-07-30 2011-06-29 皇家飞利浦电子股份有限公司 具有发光二极管电路的器件
US8466627B2 (en) 2008-07-30 2013-06-18 Koninklijke Philips N.V. Device with light-emitting diode circuits
WO2010013173A3 (en) * 2008-07-30 2010-11-18 Philips Intellectual Property & Standards Gmbh Device with light-emitting diode circuits
CN102113411B (zh) * 2008-07-30 2015-05-20 皇家飞利浦电子股份有限公司 具有发光二极管电路的器件
WO2010038190A1 (en) * 2008-10-02 2010-04-08 Philips Intellectual Property & Standards Gmbh Led circuit arrangement with improved flicker performance
CN102172102A (zh) * 2008-10-02 2011-08-31 皇家飞利浦电子股份有限公司 闪烁性能改进的led电路布置
US8492986B2 (en) 2008-10-02 2013-07-23 Koninklijke Philips N.V. LED circuit arrangement with improved flicker performance
RU2511714C2 (ru) * 2008-10-02 2014-04-10 Конинклейке Филипс Электроникс Н.В. Компоновка схемы светоизлучающих диодов с улучшенной рабочей характеристикой мерцания
CN102172102B (zh) * 2008-10-02 2014-06-25 皇家飞利浦电子股份有限公司 减少闪烁的电路及照明设备
US9000676B2 (en) 2010-10-19 2015-04-07 Koninklijke Philips N.V. LED circuit arrangement
WO2020035436A1 (en) * 2018-08-17 2020-02-20 Signify Holding B.V. Led driving circuit
CN112567891A (zh) * 2018-08-17 2021-03-26 昕诺飞控股有限公司 Led驱动电路
JP2021535543A (ja) * 2018-08-17 2021-12-16 シグニファイ ホールディング ビー ヴィSignify Holding B.V. Ｌｅｄ駆動回路
US11291094B2 (en) 2018-08-17 2022-03-29 Signify Holding B.V. LED driving circuit
JP7335324B2 (ja) 2018-08-17 2023-08-29 シグニファイ ホールディング ビー ヴィ Ｌｅｄ駆動回路
CN112567891B (zh) * 2018-08-17 2024-04-05 昕诺飞控股有限公司 Led驱动电路

Also Published As

Publication number Publication date
DE69512720D1 (de) 1999-11-18
EP0695112B1 (de) 1999-10-13
FR2723286A1 (fr) 1996-02-02
DE69512720T2 (de) 2000-06-08
FR2723286B1 (fr) 1996-09-13

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