DE102005036692A1 - Lighting device for vehicle lamp, has LED matrix, in which LEDs are arranged in parallel/serial circuit, and one light emitting diode, which is not part of network and attached to failure recognizing detector that is connected to matrix - Google Patents

Lighting device for vehicle lamp, has LED matrix, in which LEDs are arranged in parallel/serial circuit, and one light emitting diode, which is not part of network and attached to failure recognizing detector that is connected to matrix Download PDF

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Publication number
DE102005036692A1
DE102005036692A1 DE102005036692A DE102005036692A DE102005036692A1 DE 102005036692 A1 DE102005036692 A1 DE 102005036692A1 DE 102005036692 A DE102005036692 A DE 102005036692A DE 102005036692 A DE102005036692 A DE 102005036692A DE 102005036692 A1 DE102005036692 A1 DE 102005036692A1
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Prior art keywords
emitting diode
light
leds
matrix
led matrix
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DE102005036692A
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German (de)
Inventor
Arne Meinel
Stephan Schröder
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Hella GmbH and Co KGaA
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Hella KGaA Huek and Co
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Priority to DE102005036692A priority Critical patent/DE102005036692A1/en
Priority to EP06118231A priority patent/EP1753267A1/en
Publication of DE102005036692A1 publication Critical patent/DE102005036692A1/en
Withdrawn legal-status Critical Current

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    • 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

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  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

The device has a light emitting diode matrix, in which a several light emitting diodes are arranged in a combined parallel/serial circuit. One light emitting diode is provided, which is not a part of the light emitting diode network, and a failure recognizing detector is attached to that light emitting diode and LED matrix. The detector measures current through the LED matrix or through a respective serial LED circuit to recognize failure of LEDs.

Description

Die Erfindung bezieht sich auf eine Beleuchtungseinrichtung für Fahrzeugleuchten mit Leuchtdioden (LEDs) als Lichtquelle. Der Einsatz von Leuchtdioden bei Fahrzeugheckleuchten zur Realisierung von verschiedenen Lichtfunktionen (Blink-, Brems-, Schlusslicht) ist bereits weit verbreitet. Dabei sind zur Erreichung der erforderlichen Lichtwerte für die jeweiligen Lichtfunktionen oftmals eine Vielzahl von Leuchtdioden notwendig.The The invention relates to a lighting device for vehicle lights with light-emitting diodes (LEDs) as the light source. The use of light emitting diodes in vehicle tail lights for the realization of various lighting functions (Flashing, brake, tail light) is already widespread. there are to achieve the required light levels for each Light functions often a variety of light emitting diodes necessary.

Aus der DE 697 06 586 T2 ist eine gattungsgemäße Beleuchtungseinrichtung mit einem Leuchtdiodennetz bekannt, wobei in dem Leuchtdiodennetz eine Vielzahl von Leuchtdioden in kombinierter Parallel-/Reihenschaltung angeordnet ist. Eine solches Leuchtdiodennetz in kombinierter Parallel-/Reihenschaltung wird auch LED-Matrixschaltung oder einfach LED-Matrix genannt. Eine LED-Matrix von N LEDs hat gegenüber einer reinen Reihenschaltung von N LEDs den Vorteil, dass auch beim Ausfall einer oder einzelner LEDs die Stromversorgung – und damit das Leuchten – der übrigen, intakten (N-1) LEDs über die Vernetzung der Stromzweige in der Matrix weiter sichergestellt ist, während bei einer Reihenschaltung der Ausfall einer einzelnen LED den Ausfall sämtlicher LEDs zur Folge hat. Gegenüber einer reinen Parallelschaltung sämtlicher LEDs hat eine LED-Matrix den Vorteil, dass der Schaltungs- und Ansteuerungsaufwand geringer ist.From the DE 697 06 586 T2 a generic lighting device with a light-emitting diode network is known, wherein in the light-emitting diode network, a plurality of light-emitting diodes is arranged in a combined parallel / series circuit. Such 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. Compared to a pure parallel connection of all LEDs, an LED matrix has the advantage that the circuit and control effort is less.

Für bestimmte Lichtfunktionen ist es wünschenswert, den Fahrer über den Ausfall dieser Lichtfunktion bzw. der entsprechenden Leuchte zu informieren. Für das Blinklicht ist dies sogar gesetzlich vorgeschrieben. Zu diesem Zweck ist es seit langem bekannt, den Ausfall eines Blinklichts mit einer konventionellen Glühlampe über einen der Glühlampe zugeordneten Ausfallerkennungsdetektor zu erkennen, der den Strom durch die Glühlampe überwacht.For certain Lighting functions it is desirable the driver over the failure of this light function or the corresponding lamp to inform. For the flashing light is even required by law. To this Purpose, it has long been known the failure of a flashing light with a conventional light bulb over one associated with the light bulb Detect failure detection detector, which monitors the current through the light bulb.

Bei einem Blinklicht, dass nicht mit einer einzigen Glühlampe, sondern mit einer Vielzahl von Leuchtdioden realisiert wird, ist die Ausfallerkennung problematischer, da nicht nur eine Lichtquelle vorhanden ist, sondern eine Vielzahl.at a flashing light that does not have a single bulb, but is realized with a variety of light-emitting diodes is Failure detection is more problematic because not just a light source exists but a variety.

Aus der DE 197 34 750 A1 ist ein Blinklicht mit einer LED-Matrix bekannt, der ein Ausfallerkennungsdetektor zugeordnet ist. Dort wird also mit einem Ausfallerkennungsdetektor die LED-Matrix insgesamt überwacht, indem der Spannungsabfall über der LED-Matrix oder der Strom durch die LED-Matrix insgesamt gemessen wird. Ein Nachteil dabei ist, dass die Überwachung einer LED-Matrix mit einem einzigen Ausfallerkennungsdetektor nicht sehr empfindlich ist, da der Ausfall einzelner LEDs in der LED-Matrix nur zu einer geringen Änderung der von dem Ausfallerkennungsdetektor registrierten Spannungs- oder Stromwerte führt. Meist wird der Ausfall der LED-Matrix erst dann erkannt, wenn eine komplette LED-Zeile der LED-Matrix ausgefallen ist, da dann der Stromfluß durch die LED-Matrix unterbrochen ist.From the DE 197 34 750 A1 a flashing light with an LED matrix is known, which is associated with a failure detection detector. There, 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. Usually, 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.

Aufgrund der konstruktiven Anordnung der einzelnen LEDs innerhalb LED-Matrix liefern die einzelnen LEDs nicht den gleichen Beitrag zur gewünschten (oder sogar gesetzlich vorgeschriebenen) Lichtverteilung, insbesondere bei Berücksichtigung unterschiedlicher Betrachtungswinkel. Vielmehr ist es so, dass bestimmte LEDs einen größeren Beitrag zur Lichtverteilung liefern. In der DE 197 34 750 A1 finden sich keine Angaben darüber, dass die Beiträge einzelner LEDs der LED-Matrix zur Lichtverteilung unterschiedlich sein können.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.

Fällt nun eine der LEDs aus, deren Beitrag im Vergleich zu den anderen LEDs der LED-Matrix bedeutender ist, kann es sein, dass die LED-Matrix die Anforderungen an die gewünschte Lichtverteilung schon nicht mehr erfüllt, obwohl der Ausfallerkennungsdetektor gemäß DE 197 34 750 A1 noch keinen Ausfall detektieren würde.If one of the LEDs now fails, whose contribution is more significant compared to the other LEDs in the LED matrix, 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.

Aufgabe der Erfindung ist es daher, in kostengünstiger Weise eine zuverlässige Ausfallerkennung für Beleuchtungseinrichtungen von Fahrzeugleuchten zu schaffen, die eine LED-Matrix umfassen.task The invention is therefore, in a cost effective manner a reliable failure detection for lighting equipment to create vehicle lights that include an LED matrix.

Erfindungsgemäß wird diejenige LED (oder diejenigen LEDs), die einen besonderen (unverzichtbaren) Beitrag zur gewünschten Lichtverteilung leistet aus der LED-Matrix herausgelöst und in einem Einzelzweig- unabhängig von der LED-Matrix – angeordnet. Dieser mindestens einen LED wird dann ein eigenständiger Ausfallerkennungsdetektor zugeordnet. Auf diese Weise wird die Ausfallerkennung in kostengünstiger Weise sehr gezielt dort eingesetzt, wo sie unverzichtbar ist. Gleichzeitig können die LEDs, deren Ausfall einzeln für sich betrachtet für die Lichtverteilung nicht kritisch ist, weiterhin in vorteilhafter Weise in einer LED-Matrix angeordnet sein.According to the invention that LED (or those LEDs) that have a special (indispensable) Contribution to the desired Light distribution dissolves out of the LED matrix and into a single branch independent from the LED matrix - arranged. This at least one LED then becomes an independent failure detection detector assigned. In this way, the failure detection is cheaper Very purposefully used where it is indispensable. simultaneously can the LEDs, whose failure individually considered for the light distribution is not critical, further advantageously in an LED matrix be arranged.

Die mindestens eine kritische LED wird vorzugsweise parallel zur LED-Matrix geschaltet. Da der Ausfall einzelner LEDs der LED-Matrix unkritisch ist und der Ausfall der LED-Matrix insgesamt aufgrund der vorteilhaften Matrixverschaltung unwahrscheinlich ist, ist es in einer ersten Ausführungsform sogar vorgesehen, der LED-Matrix mit den unkritischen LEDs gar keinen Ausfallerkennungsdetektor zuzuordnen, sondern nur der mindestens einen kritischen LED. Durch den Verzicht auf den Ausfallerkennungsdetektor für die LED-Matrix wird die Beleuchtungseinrichtung insgesamt kostengünstiger.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 illumination overall cheaper.

In einer weiteren Ausführungsform, dort wo die Anforderungen an die Zuverlässigkeit der Ausfallerkennung besonders hoch sind, ist es vorgesehen, dass sowohl der LED-Matrix als auch der mindestens einen LED, die nicht Teil der LED-Matrix ist, ein Ausfallerkennungsdetektor zugeordnet ist. In diesem Fall ist der Ausfall der LED-Matrix insgesamt auch wieder als kritisch zu betrachten.In another embodiment, where the requirements for reliability of failure detection are particularly high, it is intended that both the LED matrix as well as the at least one LED that is not part of the LED matrix is associated with a failure detection detector. In this case is the failure of the LED matrix as a whole also again as critical consider.

In einer weiteren Ausführungsform ist es zwar ebenfalls vorgesehen, sowohl für die LED-Matrix als auch der für die mindestens eine LED, die nicht der Teil LED-Matrix ist, eine Ausfallerkennung vorzunehmen, wobei allerdings nur ein Ausfallerkennungsdetektor vorgesehen ist, der wahlweise im Umschaltbetrieb der LED-Matrix oder der mindestens einen kritischen LED zugeordnet werden kann.In a further embodiment Although it is also provided for both the LED matrix and the at least an LED, which is not part of the LED matrix, to make a failure detection, although only one failure detection detector is provided, optionally in switching mode of the LED matrix or at least a critical LED can be assigned.

In der Regel weist eine Beleuchtungseinrichtung für Fahrzeugleuchten mehr als eine kritische LED auf. In diesem Fall ist es vorgesehen, diese LEDs in einer Reihenschaltung anzuordnen, die ebenfalls nicht Teil der LED-Matrix ist, und dieser Reihenschaltung dann einen Ausfallerkennungsdetektor zuzuordnen. Der Ausfall einer einzelnen kritischen LED würde dann in der Reihenschaltung zu einem einfach zu detektierenden Ausfall der gesamten Reihe führen. Die Reihenschaltung der kritischen LEDs wird vorzugsweise parallel zur LED-Matrix geschaltet.In usually has a lighting device for vehicle lights more than a critical LED on. In this case, it is provided these LEDs to arrange in a series circuit, which is also not part of LED matrix is, and assign this series circuit then a failure detection detector. The failure of a single critical LED would then be in series lead to an easily detectable failure of the entire series. The Series connection of the critical LEDs is preferably parallel to LED matrix switched.

Falls beispielsweise die Zahl der kritischen LEDs so groß ist, dass eine einzige Reihenschaltung aller kritischen LEDs wegen der Addition der Flußspannungen und der begrenzten Höhe der Versorgungsspannung nicht möglich ist, so ist es vorgesehen, die kritischen LEDs auf zwei oder mehr Reihenschaltungen aufzuteilen, denen jeweils ein separater Ausfallerkennungsdetektor zugeordnet ist. Die Reihenschaltungen sind vorzugsweise parallel zur LED-Matrix geschaltet.If For example, the number of critical LEDs is so large that a single series of all critical LEDs because of the addition the flux voltages and the limited height the supply voltage is not possible is, so it is intended, the critical LEDs to two or more Divide series circuits, each having a separate failure detection detector assigned. The series circuits are preferably parallel switched to the LED matrix.

Auch für den Fall der Reihenschaltung(en) der kritischen LEDs ist es vorgesehen, nur einen einzigen Ausfallerkennungsdetektor einzusetzen, der im Multiplexbetrieb zwischen der LED-Matrix und der (den) Reihenschaltung(en) geschaltet wird.Also for the Case of series connection (s) of the critical LEDs is provided use only a single failure detection detector in multiplex mode between the LED matrix and the series circuit (s) is switched.

Anhand der beigefügten 1 soll ein Ausführungsbeispiel der Erfindung nachfolgend näher erläutert werden.Based on the attached 1 an embodiment of the invention will be explained in more detail below.

1 zeigt eine Beleuchtungseinrichtung für Fahrzeugleuchten, mit einer Parallelschaltung aus einer LED-Matrix mit unkritischen LEDs und zwei Reihenschaltungen mit kritischen LEDs. Die LED-Matrix und die Reihenschaltungen werden von der Fahrzeugbordnetzspannung (VCC) versorgt. Die LED-Matrix besteht aus 3 Zeilen und 4 Spalten. 1 shows a lighting device for vehicle lights, with a parallel circuit of a 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). The LED matrix consists of 3 rows and 4 columns.

In der dargestellten Ausführungsform ist sowohl der LED-Matrix als auch jeder Reihenschaltung mit kritischen LEDs ein Ausfallerkennungsdetektor zugeordnet. Die Ausfallerkennungsdetektoren messen den Strom durch die LED-Matrix bzw. durch die jeweilige Reihenschaltung, um einen Ausfall zu erkennen.In the illustrated embodiment is both the LED matrix and each series circuit with critical LEDs 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.

Die Ausgangssignale der Ausfallerkennungsdetektoren werden einer Auswerteeinheit zugeführt, die für den Fall, dass einer der Ausfallerkennungsdetektoren einen Ausfall erkennt ein optisches und/oder akustisches Warnsignal erzeugt. Dabei ist es in einer Ausführungsform vorgesehen, dass das Warnsignal unterschiedlich ist, und zwar in Abhängigkeit davon, welcher Ausfallerkennungsdetektor (LED-Matrix oder Reihenschaltung) einen Ausfall meldet und/oder in Abhängigkeit davon, ob alle Ausfallerkennungsdetektoren einen Ausfall melden oder nur einer.The Output signals of the failure detection detectors become an evaluation unit supplied the for the case that one of the failure detection detectors a failure detects an optical and / or audible warning signal generated. there it is in one embodiment provided that the warning signal is different, namely in dependence of 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 just one.

Dabei bedeutet i.O. in Ordnung und n.i.O. nicht in Ordung.there means i.O. okay and n.i.O. not in order.

Claims (6)

Beleuchtungseinrichtung für Fahrzeugleuchten umfassend ein Leuchtdiodennetz, in dem eine Vielzahl von Leuchtdioden in kombinierter Parallel-/Reihenschaltung angeordnet ist, dadurch gekennzeichnet, dass mindestens eine Leuchtdiode vorgesehen ist, die nicht Teil des Leuchtdiodennetzes ist, wobei dieser Leuchtdiode ein Ausfallerkennungsdetektor zugeordnet ist.Lighting device for vehicle lights comprising a light-emitting diode network in which a plurality of light-emitting diodes is arranged in a combined parallel / series circuit, characterized in that at least one light-emitting diode is provided which is not part of the light emitting diode network, said light emitting diode is associated with a failure detection detector. Beleuchtungseinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass dem Leuchtdiodennetz ein LED-Matrix-Ausfallerkennungsdetektor zugeordnet ist.Lighting device according to claim 1, characterized characterized in that the LED network, an LED matrix failure detection detector assigned. Beleuchtungseinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die mindestens eine Leuchtdiode, die nicht Teil des Leuchtdiodennetzes ist, parallel zum Leuchtdiodennetz geschaltet ist.Lighting device according to claim 1 or 2, characterized characterized in that the at least one light emitting diode that is not Part of the light-emitting diode network is connected in parallel to the light-emitting diode network is. Beleuchtungseinrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass mindestens eine Reihenschaltung von zwei oder mehr Leuchtdioden vorgesehen ist, die nicht Teil des Leuchtdiodennetzes sind, wobei der Reihenschaltung dieser Leuchtdioden ein Ausfallerkennungsdetektor zugeordnet ist.Lighting device according to one of the preceding Claims, characterized in that at least one series circuit of two or more light-emitting diodes is provided which are not part of the light-emitting diode network are, wherein the series connection of these LEDs a failure detection detector assigned. Beleuchtungseinrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die mindestens eine Reihenschaltung der nicht zum Leuchtdiodennetz gehörenden Leuchtdioden parallel zum Leuchtdiodennetz geschaltet ist.Lighting device according to claim 4, characterized in that the at least one Series connection of not belonging to the light emitting diode network LEDs is connected in parallel to the LED network. Beleuchtungseinrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass nur ein Ausfallerkennungsdetektor vorgesehen ist, der wahlweise dem Leuchtdiodennetz, der mindestens einen Leuchtdiode und/oder einer Reihenschaltung zugeordnet wird.Lighting device according to one of the preceding Claims, characterized in that only one failure detection detector is provided, the optional light-emitting diode network, the at least one light-emitting diode and / or a series connection is assigned.
DE102005036692A 2005-08-04 2005-08-04 Lighting device for vehicle lamp, has LED matrix, in which LEDs are arranged in parallel/serial circuit, and one light emitting diode, which is not part of network and attached to failure recognizing detector that is connected to matrix Withdrawn DE102005036692A1 (en)

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DE102005036692A DE102005036692A1 (en) 2005-08-04 2005-08-04 Lighting device for vehicle lamp, has LED matrix, in which LEDs are arranged in parallel/serial circuit, and one light emitting diode, which is not part of network and attached to failure recognizing detector that is connected to matrix
EP06118231A EP1753267A1 (en) 2005-08-04 2006-08-01 Lighting device for vehicle lamps

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DE102005036692A DE102005036692A1 (en) 2005-08-04 2005-08-04 Lighting device for vehicle lamp, has LED matrix, in which LEDs are arranged in parallel/serial circuit, and one light emitting diode, which is not part of network and attached to failure recognizing detector that is connected to matrix

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DE102011011699A1 (en) 2011-02-18 2012-08-23 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Lighting device for vehicles
EP2783915A1 (en) * 2013-03-26 2014-10-01 Odelo GmbH Method for generating a diagnosis signal of a motor vehicle light with a plurality of lamps and motor vehicle light
DE102013110840A1 (en) * 2013-10-01 2015-04-02 Hella Kgaa Hueck & Co. Device and method for diagnosing LEDs in a LED array system

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DE102011113080A1 (en) * 2011-02-18 2012-08-23 Volkswagen Aktiengesellschaft Method for diagnosing e.g. tail light unit, of e.g. passenger car, involves detecting voltage potential at diagnostic port terminal of evaluation device, and generating diagnosis information based on detected potential
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DE102013110840A1 (en) * 2013-10-01 2015-04-02 Hella Kgaa Hueck & Co. Device and method for diagnosing LEDs in a LED array system
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