EP2329686A1 - Procédé pour faire fonctionner un montage en série d au moins deux led - Google Patents

Procédé pour faire fonctionner un montage en série d au moins deux led

Info

Publication number
EP2329686A1
EP2329686A1 EP09783324A EP09783324A EP2329686A1 EP 2329686 A1 EP2329686 A1 EP 2329686A1 EP 09783324 A EP09783324 A EP 09783324A EP 09783324 A EP09783324 A EP 09783324A EP 2329686 A1 EP2329686 A1 EP 2329686A1
Authority
EP
European Patent Office
Prior art keywords
led
series circuit
control unit
leds
power
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.)
Withdrawn
Application number
EP09783324A
Other languages
German (de)
English (en)
Inventor
Josef Studniorz
Ralf Edelmeier
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.)
Hella GmbH and Co KGaA
Original Assignee
Hella KGaA Huek and Co
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 Hella KGaA Huek and Co filed Critical Hella KGaA Huek and Co
Publication of EP2329686A1 publication Critical patent/EP2329686A1/fr
Withdrawn legal-status Critical Current

Links

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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/58—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving end of life detection of LEDs
    • 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
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/23—Responsive to malfunctions or to light source life; for protection of two or more light sources connected in series

Definitions

  • the present invention relates to methods of operating a series connection of at least two LEDs.
  • DE 10 2005 008 100 B4 discloses a method for operating a series connection of at least two LEDs. In order to satisfy the need for continuous operation of the remaining LEDs in applications such as display panels or the like, it is proposed that in the case of a high-impedance failure of an LED, this LED be automatically detected and short-circuited by means of an electrical bypass line.
  • a predefined voltage Vx is applied to a load resistor Rx, while the voltage Vx becomes zero in the event of a failure of one of the LEDs.
  • the object of the present invention is to provide a method for operating a series connection of at least two LEDs, in which the high-impedance failure of an LED is reliably detected by conventional control devices and at the same time a continuation of the operation of the remaining LEDs is made possible.
  • a significant advantage of the method according to the invention is, in particular, that a high-impedance failure of an LED is reliably detected by conventional control devices and at the same time a continuation of the operation of the remaining LED's is possible.
  • the failure of at least one of the LEDs is indicated by the change of a voltage Vx at a load resistor Rx.
  • Vx a voltage at a load resistor
  • conventional control devices for example for use in motor vehicles, are designed to detect the high-impedance failure of light sources configured as incandescent lamps. This happens because in the case of a high-impedance failure of the incandescent lamp, the current flow fails, which is clearly identifiable as a fault in the control unit.
  • the inventive approach is now to realize an error detection of high-impedance failed LED's, which is analogous to the failure of a light bulb. This is achieved by a method according to claim 1.
  • the conventional, actually designed for incandescent control devices can also be used in LED's designed as light sources.
  • the method according to the invention can be used particularly advantageously in LED arrays in which the series connection is an LED branch of an LED array consisting of at least two LED branches and each of the LED branches is operated in the manner according to the invention.
  • Fig. An embodiment of a series connection of at least two LEDs for carrying out the method according to the invention.
  • the single FIGURE shows a series circuit 2 of at least two LEDs 4.
  • the series circuit 2 is part of a lighting device for a motor vehicle, not shown, and electrically connected to a power source 6 of a power grid 8.
  • the current source 6 is connected in a manner known to those skilled in the art to a control unit 7 in a signal-transmitting manner.
  • the series circuit 2 here has a total of 10 LED's 4, of which only four LED's 4 are shown for the sake of clarity. The remaining LEDs are indicated by a dashed line in the current path of the LEDs 4.
  • a switch 12 is electrically connected in parallel to each individual LED 4 of the series circuit 2 or to a respective group 10 with at least two LEDs 4.
  • a switch 12 is connected in parallel to the first and last LED 4 of the series circuit 2 in the direction of current flow; the remaining LEDs 4 are here combined in groups 10 to two LEDs 4, wherein each of the groups 10 only a single switch 12 is connected in parallel.
  • the remaining LEDs 4 are here combined in groups 10 to two LEDs 4, wherein each of the groups 10 only a single switch 12 is connected in parallel.
  • one or the other solution and the number of LEDs 4 in a group of economic and technical considerations is practical. For example, it makes sense to summarize LED's 4 with a smaller importance for the specific lighting function meaning to a group 10, while a separate switch 12 is connected in parallel to LED's 4 with greater importance.
  • the switches 12 can be selected by type, material and arrangement within wide suitable limits.
  • the series circuit 2 is connected in a manner known to those skilled in the art with a control unit 14 signal transmitting.
  • the control unit 14 is signal transmitting connected to the power source 6, a voltage measuring device 16 and the switches 12, which is symbolized by the solid and dashed arrows in the figure. - A -
  • the switches 12 are open. See the figure.
  • the voltage drop across the entire series circuit 2 is measured by means of the voltage measuring device 16 in the manner known to those skilled in the art and forwarded to the control unit 14 for further processing. Depending on the application, the measurement can be continuous or discontinuous. In normal operation, that is, when the voltage thus determined is below a predetermined threshold, the switches 12 remain open.
  • an LED 4 of the series circuit 2 fails with high resistance, ie if the current path with the LEDs 4 is interrupted, the voltage drop above the limit value increases.
  • the control unit 14 detects this and then switches off the current source 6 in a manner known to those skilled in the art, so that the LEDs 4 of the series circuit 2 are no longer energized.
  • This power cut is limited in time to a minimum and just long enough so that the controller 7 can safely detect the resulting reduced power consumption. In this way it is ensured that on the one hand, the failure, namely the failure of at least one LED 4 of the series circuit 2 is reliably detected. On the other hand, it is achieved that the complete shutdown of the LEDs 4 of the series circuit 2 to the user, here the road users, not noticeable.
  • the control unit 14 After the short-term complete shutdown for fault detection by the control unit 7, ie after the expiry of a predetermined shutdown period, recognizes the control unit 14 in a known manner, the at least one high-impedance failed LED 4 and bridges it by the automatic closing of this LED 4 or By the short circuiting of the at least one faulty LED 4, the current path is closed again and the control unit 14 switches the power supply to the group 10 in which the faulty LED 4 is included. source 6 again, so that the still functioning LEDs 4 of the series circuit 2 shine again.
  • the conventional control units which are actually designed for incandescent lamps, can also be used with light sources designed as LEDs.
  • the series circuit is an LED branch of an LED array consisting of at least two LED branches, each of which is operated in the aforementioned manner.
  • This embodiment is particularly advantageous in motor vehicles in order to achieve the luminous flux required for the respective lighting task, for example the illumination of the vehicle surroundings.
  • the inventive method can also be used advantageously for other lighting tasks and other uses.

Landscapes

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

Abstract

La présente invention concerne un procédé pour faire fonctionner un montage en série (2) comprenant au moins deux LED (4), le procédé comportant, dans la séquence indiquée, les étapes consistant à : - alimenter le montage en série (2) en courant au moyen d’une source de courant ou de tension (6) d’un réseau électrique (8), - mesurer la chute de tension sur tout le montage en série (2), - couper l’alimentation électrique à l’aide d’une unité de commande (14) lorsque la chute de tension mesurée dépasse une valeur limite définie au préalable, - détecter grâce à un appareil de commande (7) du réseau électrique (8) la panne d’au moins une des LED (4) en raison de la consommation réduite de courant, - détecter et court-circuiter la LED en panne (4) grâce à l’unité de commande (14).
EP09783324A 2008-09-24 2009-09-23 Procédé pour faire fonctionner un montage en série d au moins deux led Withdrawn EP2329686A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008048701.5A DE102008048701B4 (de) 2008-09-24 2008-09-24 Verfahren zum Betrieb einer Reihenschaltung von mindestens zwei LED's
PCT/EP2009/062319 WO2010034739A1 (fr) 2008-09-24 2009-09-23 Procédé pour faire fonctionner un montage en série d’au moins deux led

Publications (1)

Publication Number Publication Date
EP2329686A1 true EP2329686A1 (fr) 2011-06-08

Family

ID=41375850

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09783324A Withdrawn EP2329686A1 (fr) 2008-09-24 2009-09-23 Procédé pour faire fonctionner un montage en série d au moins deux led

Country Status (3)

Country Link
EP (1) EP2329686A1 (fr)
DE (1) DE102008048701B4 (fr)
WO (1) WO2010034739A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010005779U1 (de) * 2010-04-16 2010-08-05 Conwys Ag Anhängererkennungseinrichtung
EP2427033B1 (fr) * 2010-09-07 2014-11-12 Monolithic Power Systems, Inc. Circuit de dérivation pour diodes électroluminescentes couplées en série et procédés de fonctionnement associés
DE102014216085A1 (de) 2014-08-13 2016-02-18 Automotive Lighting Reutlingen Gmbh Überwachungseinheit für ein eine Halbleiterlichtquelle umfassendes Lichtmodul für eine Beleuchtungseinrichtung eines Kraftfahrzeugs
DE102017000324A1 (de) 2017-01-16 2018-07-19 Osram Gmbh Schaltungsanordnung und Verfahren zu deren Betrieb
DE102018213182A1 (de) * 2018-08-07 2020-02-13 Bayerische Motoren Werke Aktiengesellschaft Kontrollsystem für ein Kraftfahrzeug und Verfahren zur Fehlerdiagnose bei einem Kontrollsystem

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2778481B1 (fr) 1998-05-05 2000-06-23 Sagem Procede de gestion d'une source de lumiere de signalisation routiere
DE10243794B9 (de) 2002-09-20 2007-03-08 Osram Opto Semiconductors Gmbh Schaltungsanordnung mit einer LED-Anordnung
JP2004122913A (ja) 2002-10-01 2004-04-22 Koito Mfg Co Ltd 車両用灯具
JP4236894B2 (ja) * 2002-10-08 2009-03-11 株式会社小糸製作所 点灯回路
DE102004007278A1 (de) * 2003-03-27 2004-10-07 Goodrich Hella Aerospace Lighting Systems Gmbh Beleuchtungsvorrichtung, insbesondere für den Innenraum von Fahrzeugen
DE10358447B3 (de) * 2003-12-13 2005-05-25 Insta Elektro Gmbh Beleuchtungseinrichtung
DE102005008100B4 (de) 2005-02-22 2007-03-08 Mitsubishi Denki K.K. Redundanzschaltung für in Reihe angeschlossene Dioden
US7710050B2 (en) 2005-11-17 2010-05-04 Magna International Inc Series connected power supply for semiconductor-based vehicle lighting systems
DE102006018813A1 (de) * 2006-03-29 2007-10-04 Kompled Gmbh & Co. Kg Fahrzeugleuchtenanordnung
DE102006018575A1 (de) * 2006-04-21 2007-10-25 Tridonicatco Gmbh & Co. Kg Fehlererkennung von Leuchtdioden

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010034739A1 *

Also Published As

Publication number Publication date
DE102008048701B4 (de) 2020-06-04
DE102008048701A1 (de) 2010-03-25
WO2010034739A1 (fr) 2010-04-01

Similar Documents

Publication Publication Date Title
DE102004027676B4 (de) Verfahren und Vorrichtung zum Prüfen wenigstens eines LED-Strangs
EP2643194B1 (fr) Procédé permettant d'identifier une défaillance d'un interrupteur de commande servant à déclencher une fonction d'un véhicule et interrupteur de commande permettant la mise en oeuvre dudit procédé
DE102008048701B4 (de) Verfahren zum Betrieb einer Reihenschaltung von mindestens zwei LED's
EP2217475B1 (fr) Dispositif pour l'actionnement électrique d'un système critique pour la sécurité
DE112012002418B4 (de) Elektronische Schalteranordnung
DE102010003506B4 (de) LED-Clusterschaltung mit Fehlerdetektion, LED-Leuchte und Beleuchtungssystem
EP0992961B1 (fr) Circuit d'opération d'un panneau lumineux
DE102016122370A1 (de) Not-Befehlsgerät und Sicherheitseinrichtung mit einem Not-Befehlsgerät
DE3616506A1 (de) Verfahren und vorrichtung zur ueberwachung elektrischer verbraucher
EP1364459A2 (fr) Dispositif de commutation de securite
WO2008065018A1 (fr) Agencement de circuits et procédé de protection contre les pannes d'une chaîne de led ou de oled
DE60209677T2 (de) Lichtinformationseinrichtung zum Anzeigen des Betriebszustandes eines Systems, insbesondere für die Avionics
DE10019612B4 (de) Verfahren zur Diagnose des Schaltzustandes und der Belastung eines Halbleiterschalters
EP2866524B1 (fr) Système et procédé de surveillance de plusieurs rampes de DEL et éclairage à DEL doté d'un tel système
EP2648481B1 (fr) Adaptateur destiné au raccordement de lampes à DEL sur une alimentation en tension dotée d'une surveillance de fonction pour lampes à incandescence
DE102012102638A1 (de) Fahrzeugbeleuchtungssysteme mit Detektierung einer Störung in einer der Fahrzeugleuchten
AT500039B1 (de) Schaltungsanordnung mit einer led-anordnung
EP2547556B1 (fr) Procédé de détection d'un court-circuit vers le pôle positif de la batterie et dispositif de circuit pour mettre en uvre le procédé
DE10143792B4 (de) Fahrzeugrückleuchte
WO2017191280A1 (fr) Agencement de circuit et procédé de simulation d'un courant de charge à partir d'un réseau de bord
DE19930994B4 (de) Schaltungsanordnung zur Überwachung von Relais in Sicherheitsschaltungen mit mindestens 3 Relais
EP1986935B1 (fr) Dispositif de contrôle d'une platine électrotechnique avec une piste conductrice
DE2919356A1 (de) Vorrichtung zum ueberwachen und anzeigen der funktionsfaehigkeit von fahrzeugeinrichtungen
EP2469985B1 (fr) Dispositif et procédé pour garantir l'exploitation correcte de lampes à DEL en combinaison avec des ordinateurs de bord de véhicules
DE102014211981A1 (de) Überwachungsschaltung für einen elektrischen Schaltkreis und Kraftfahrzeug

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20110309

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

AX Request for extension of the european patent

Extension state: AL BA RS

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20131129

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20150108