EP1753267A1 - Dispositif d'éclairage pour lampes de véhicule - Google Patents

Dispositif d'éclairage pour lampes de véhicule Download PDF

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Publication number
EP1753267A1
EP1753267A1 EP06118231A EP06118231A EP1753267A1 EP 1753267 A1 EP1753267 A1 EP 1753267A1 EP 06118231 A EP06118231 A EP 06118231A EP 06118231 A EP06118231 A EP 06118231A EP 1753267 A1 EP1753267 A1 EP 1753267A1
Authority
EP
European Patent Office
Prior art keywords
light
emitting diode
led matrix
led
leds
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Withdrawn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
EP06118231A
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German (de)
English (en)
Inventor
Arne Meinel
Stephan Schröder
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 EP1753267A1 publication Critical patent/EP1753267A1/fr
Withdrawn legal-status Critical Current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]
    • H05B45/50—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
    • 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
    • H05B47/21—Responsive to malfunctions or to light source life; for protection of two or more light sources connected in parallel
    • H05B47/22—Responsive to malfunctions or to light source life; for protection of two or more light sources connected in parallel with communication between the lamps and a central unit

Definitions

  • the invention relates to a lighting device for vehicle lights with light emitting diodes (LEDs) as a light source.
  • LEDs light emitting diodes
  • the use of light-emitting diodes in vehicle tail lights for the realization of various light functions (flashing, brake, tail light) is already widespread. In this case, a plurality of light-emitting diodes are often necessary to achieve the required light values for the respective lighting functions.
  • a generic lighting device with a light-emitting diode network wherein in the light-emitting diode network, a plurality of light-emitting diodes is arranged in a combined parallel / series circuit.
  • a light-emitting diode network in combined parallel / series connection is also called LED matrix circuit or simply LED matrix.
  • An LED matrix of N LEDs has the advantage over a purely series connection of N LEDs that even if one or one of the LEDs fails, the power supply - and thus the illumination - of the remaining, intact (N-1) LEDs via the networking of the current branches in the matrix is further ensured, while in a series connection of the failure of a single LED has the failure of all LEDs result.
  • an LED matrix has the advantage that the circuit and control effort is less.
  • a flashing light with an LED matrix is known, which is associated with a failure detection detector.
  • a failure detection detector monitors the LED matrix as a whole by measuring the voltage drop across the LED matrix or the current through the LED matrix as a whole.
  • a disadvantage is that the monitoring of an LED matrix with a single failure detection detector is not very sensitive, since the failure of individual LEDs in the LED matrix leads only to a small change in the voltage or current values registered by the failure detection detector.
  • the failure of the LED matrix is only recognized when a complete LED row of the LED matrix has failed, because then the current flow through the LED matrix is interrupted.
  • the individual LEDs Due to the structural arrangement of the individual LEDs within the LED matrix, the individual LEDs do not provide the same contribution to the desired (or even prescribed by law) light distribution, in particular when different viewing angles are taken into account. Rather, it is the case that certain LEDs provide a greater contribution to the distribution of light. In the DE 197 34 750 A1 there are no indications that the contributions of individual LEDs of the LED matrix to the light distribution can be different.
  • the LED matrix may no longer meet the requirements for the desired light distribution, even though the failure detection detector according to FIG DE 197 34 750 A1 still would not detect a failure.
  • the object of the invention is therefore to provide in a cost effective manner a reliable failure detection for lighting devices of vehicle lights, which include an LED matrix.
  • that LED (or those LEDs) which makes a special (indispensable) contribution to the desired light distribution is removed from the LED matrix and arranged in a single branch independently of the LED matrix.
  • This at least one LED is then assigned an independent failure detection detector.
  • the failure detection is used in a cost effective manner very targeted where it is indispensable.
  • the LEDs, the failure of which individually is not critical for the light distribution can furthermore advantageously be arranged in an LED matrix.
  • the at least one critical LED is preferably connected in parallel with the LED matrix. Since the failure of individual LEDs of the LED matrix is not critical and the failure of the LED matrix is unlikely due to the advantageous matrix interconnection, it is even provided in a first embodiment, the LED matrix with uncritical LEDs to associate no failure detection detector, but only the at least one critical LED. By dispensing with the failure detection detector for the LED matrix, the lighting device is overall more cost effective.
  • both the LED matrix and the at least one LED, which is not part of the LED matrix a failure detection detector is assigned.
  • the failure of the LED matrix as a whole is again to be regarded as critical.
  • both for the LED matrix and for the at least one LED which is not the part LED matrix to make a failure detection, but only a failure detection detector is provided, which optionally in the switching operation the LED matrix or the at least one critical LED can be assigned.
  • a lighting device for vehicle lights has more than one critical LED.
  • it is provided to arrange these LEDs in a series circuit, which is also not part of the LED matrix, and then associate this series circuit with a failure detection detector.
  • the failure of a single critical LED would then result in the series connection to an easy to detect failure of the entire series.
  • the series connection of the critical LEDs is preferably connected in parallel with the LED matrix.
  • the critical LEDs are divided into two or more series circuits, one for each a separate failure detection detector is assigned.
  • the series circuits are preferably connected in parallel to the LED matrix.
  • Figure 1 shows a lighting device for vehicle lights, with a parallel circuit of an LED matrix with uncritical LEDs and two series circuits with critical LEDs.
  • the LED matrix and the series circuits are powered by the vehicle electrical system voltage (VCC).
  • VCC vehicle electrical system voltage
  • the LED matrix consists of 3 rows and 4 columns.
  • both the LED matrix and each series circuit with critical LEDs is assigned a failure detection detector.
  • the Failure detection detectors measure the current through the LED matrix or through the respective series connection to detect a failure.
  • the output signals of the failure detection detectors are fed to an evaluation unit, which generates an optical and / or audible warning signal in the event that one of the failure detection detectors detects a failure. It is provided in one embodiment that the warning signal is different, depending on which failure detection detector (LED matrix or series connection) reports a failure and / or depending on whether all failure detection detectors report a failure or only one.

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  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP06118231A 2005-08-04 2006-08-01 Dispositif d'éclairage pour lampes de véhicule Withdrawn EP1753267A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005036692A DE102005036692A1 (de) 2005-08-04 2005-08-04 Beleuchtungseinrichtung für Fahrzeugleuchten

Publications (1)

Publication Number Publication Date
EP1753267A1 true EP1753267A1 (fr) 2007-02-14

Family

ID=37206894

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06118231A Withdrawn EP1753267A1 (fr) 2005-08-04 2006-08-01 Dispositif d'éclairage pour lampes de véhicule

Country Status (2)

Country Link
EP (1) EP1753267A1 (fr)
DE (1) DE102005036692A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009019752A1 (de) 2009-05-02 2009-12-24 Daimler Ag Beleuchtungssystem für ein Fahrzeug
CN107347224A (zh) * 2016-05-04 2017-11-14 法雷奥照明公司 对车辆上的一组光源的局部和/或总体故障的检测

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011011699A1 (de) 2011-02-18 2012-08-23 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Beleuchtungseinrichtung für Fahrzeuge
DE102011113080A1 (de) * 2011-02-18 2012-08-23 Volkswagen Aktiengesellschaft Verfahren und Vorrichtung zur Diagnose von Leuchtmitteln in einem Fahrzeug
EP2783915B1 (fr) * 2013-03-26 2015-08-05 odelo GmbH Procédé de génération d'un signal de diagnostic d'une lampe de véhicule automobile dotée de plusieurs moyens d'éclairage et lampe de véhicule automobile
DE102013110840B4 (de) * 2013-10-01 2023-12-21 HELLA GmbH & Co. KGaA Vorrichtung und Verfahren zur Diagnose von LED's in einem LED-Array-System

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19708659C1 (de) * 1997-03-04 1998-05-20 Hella Kg Hueck & Co Blinklichtsignalanlage für Kraftfahrzeuge
DE19734750A1 (de) 1997-08-12 1999-02-18 Reitter & Schefenacker Gmbh Heckleuchte von Kraftfahrzeugen
DE69706586T2 (de) 1996-02-28 2002-07-11 Valeo Electronique, Creteil Beleuchtungsschaltung mit LEDs, insbesondere für Fahrzeuge, Stoplichter und Steuerungspanel
DE10115388A1 (de) * 2001-03-28 2002-10-10 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Ansteuerschaltung für ein LED-Array
EP1286571A2 (fr) * 2001-05-02 2003-02-26 Garufo GmbH Alimentation avec protection électronique pour un circuit et dispositif d'affichage des informations variables
EP1341402A2 (fr) * 2002-02-27 2003-09-03 Osram Opto Semiconductors GmbH Dispositif d' éclairage à module-LED

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10131824B4 (de) * 2001-06-30 2011-09-29 Hella Kgaa Hueck & Co. Schaltungseinrichtung für die Ausfallerkennung von Leuchtdioden in einem Kraftfahrzeug
DE10236862B4 (de) * 2002-08-12 2008-10-02 Hella Kgaa Hueck & Co. Schaltungsanordnung zur Stromversorgung und zum Steuern von Leuchtdiodenanordnungen, insbesondere in Fahrzeugleuchten
JP2004356000A (ja) * 2003-05-30 2004-12-16 Seiwa Electric Mfg Co Ltd Ｌｅｄ駆動回路

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69706586T2 (de) 1996-02-28 2002-07-11 Valeo Electronique, Creteil Beleuchtungsschaltung mit LEDs, insbesondere für Fahrzeuge, Stoplichter und Steuerungspanel
DE19708659C1 (de) * 1997-03-04 1998-05-20 Hella Kg Hueck & Co Blinklichtsignalanlage für Kraftfahrzeuge
DE19734750A1 (de) 1997-08-12 1999-02-18 Reitter & Schefenacker Gmbh Heckleuchte von Kraftfahrzeugen
DE10115388A1 (de) * 2001-03-28 2002-10-10 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Ansteuerschaltung für ein LED-Array
EP1286571A2 (fr) * 2001-05-02 2003-02-26 Garufo GmbH Alimentation avec protection électronique pour un circuit et dispositif d'affichage des informations variables
EP1341402A2 (fr) * 2002-02-27 2003-09-03 Osram Opto Semiconductors GmbH Dispositif d' éclairage à module-LED

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009019752A1 (de) 2009-05-02 2009-12-24 Daimler Ag Beleuchtungssystem für ein Fahrzeug
CN107347224A (zh) * 2016-05-04 2017-11-14 法雷奥照明公司 对车辆上的一组光源的局部和/或总体故障的检测
EP3242533B1 (fr) * 2016-05-04 2020-07-15 Valeo Iluminacion Détection de défaillance partielle et/ou totale d'un groupe de sources lumineuses d'un véhicule

Also Published As

Publication number Publication date
DE102005036692A1 (de) 2007-02-08

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