EP1945006B1 - LED-circuit having series-connected groups of parallel-connected LED-strings. - Google Patents

LED-circuit having series-connected groups of parallel-connected LED-strings. Download PDF

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Publication number
EP1945006B1
EP1945006B1 EP08100163.8A EP08100163A EP1945006B1 EP 1945006 B1 EP1945006 B1 EP 1945006B1 EP 08100163 A EP08100163 A EP 08100163A EP 1945006 B1 EP1945006 B1 EP 1945006B1
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EP
European Patent Office
Prior art keywords
groups
current source
group
path
current
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Application number
EP08100163.8A
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German (de)
French (fr)
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EP1945006A2 (en
EP1945006A3 (en
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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Publication of EP1945006A2 publication Critical patent/EP1945006A2/en
Publication of EP1945006A3 publication Critical patent/EP1945006A3/en
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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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix

Definitions

  • the invention relates to a light emitting diode circuit arrangement comprising groups of parallel branches, wherein the groups are arranged in series, wherein in at least a first group at least one first branch at least one light emitting diode and at least one second branch does not comprise a light emitting diode and wherein the branches in the other groups at least each comprise a light emitting diode.
  • a circuit arrangement of this kind is for example from the publication with the publication number DE 697 09 206 T2 known.
  • a circuit arrangement for light emitting diodes is disclosed in which in the second branch of the first group, that is the branch without light emitting diode, a resistance element is arranged.
  • the resistance element can be combined with a diode in particular also with a Zener diode.
  • the light-emitting diode circuit arrangement described above is to be developed such that even if the light-emitting diode in the first branch of the first group fails, the remaining light-emitting diodes in the remaining branches can continue to be operated at full power. This is intended to maintain the function of the circuit even if the light emitting diode in the first branch fails.
  • the first controlled current source is intended to adjust the current through the first branch and through the light-emitting diode arranged in the first branch.
  • the adjustment of the current through the first light-emitting diode can be effected independently of the current through the remaining light-emitting diodes.
  • a first resistance component is arranged as a measuring resistor in the first branch of the first group, which is connected to the first controlled current source for regulating the current through the first branch.
  • a circuit arrangement according to the invention may comprise a plurality of first branches in the first group.
  • the circuit arrangement according to the invention can have a further controlled current source.
  • This second controlled current source is preferably arranged in the second branch of the first group.
  • a second resistance component can then be arranged as a measuring resistor. This second resistance device interacts with the second controlled current source. This makes it possible to regulate the current through the series connection of the groups.
  • the current through the branches of the further groups and through the second branch of the first group is essentially predetermined by the second controlled current source
  • the current through the first branch is set by the first current source. The current through the first branch can thus be adjusted independently of the currents through the remaining branches.
  • the current through the first branch of the first group can be adjusted to a desired current of the light-emitting diode of the first branch by means of the first controlled current source.
  • the current through the series connection of the groups can be set so that the same current flows through each branch, in particular the branches of the further groups.
  • an operation of the circuit arrangement according to the invention in case of failure ie when selecting the LEDs in the first branch so possible that by means of the second controlled current source, the current through the series circuit of the other groups is set so that the current through the branches of the other groups as well is great as in trouble-free operation.
  • the failure of the light-emitting diode in the first branch thus has no effect on the light-emitting diode current of the remaining light-emitting diodes. The light emitted by the other LEDs thus remains unaffected.
  • the circuit arrangement according to the invention has a connection VCC for the positive potential of the voltage supply and a connection GND for the negative potential of the supply voltage.
  • VCC for the positive potential of the voltage supply
  • GND for the negative potential of the supply voltage.
  • the circuit arrangement essentially comprises six branches 1, 2, 3, 4, 5, 6 belonging to three groups 1, 2; 3, 4; 5, 6 are summarized with two branches.
  • the two branches of a group are connected in parallel and the groups are connected in series.
  • the first group 1, 2 comprises the two parallel branches 1, 2, which are connected to the connection VCC for the positive potential of the voltage source with the interposition of a resistor element R2sens.
  • the third group 5, 6 comprises the two parallel-connected branches 5, 6, which are connected to the negative potential GND of the voltage source.
  • the second group 3, 4 comprises the two parallel branches 3, 4 which is arranged between the first group 1, 2 and the third group 5, 6.
  • a resistance element R1 sens, a controlled current source lq1 and a light emitting diode D1 is used.
  • the resistance element R1sens serves as a measuring resistor for the controlled current source Iq1.
  • the current, the current source Iq1 is adjusted so that a current flows through the first branch, which corresponds to the nominal current of the light emitting diode D1.
  • a controlled current source lq2 is also provided in the second branch 2 of the first group 1, 2.
  • the second branch 2 comprises no further components.
  • the second controlled current source Iq2 is connected to the second resistance element R2sens.
  • the second resistance element R2sens serves as the second controlled current source Iq2 as a measuring resistor. With the second controlled current source Iq2, a current through the first, second and third group of the circuit arrangement is set.
  • a light-emitting diode D3, D4, D5, D6 is arranged in each case.
  • the second resistance element R2sens and the second controlled current source lq2 are coordinated or adjusted to one another such that the same current flows through all the light-emitting diodes.
  • the second controlled current source lq2 ensures that the remaining light-emitting diodes D3 to D6 are supplied with the same current uninfluenced. As a result, the light emission is maintained.

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

Description

Die Erfindung betrifft eine Leuchtdiodenschaltungsanordnung umfassend Gruppen von parallelen Zweigen, wobei die Gruppen in Reihe angeordnet sind, wobei in zumindest einer ersten Gruppe zumindest ein erster Zweig zumindest eine Leuchtdiode und zumindest ein zweiter Zweig keine Leuchtdiode umfasst und wobei die Zweige in den weiteren Gruppen zumindest je eine Leuchtdiode umfassen.The invention relates to a light emitting diode circuit arrangement comprising groups of parallel branches, wherein the groups are arranged in series, wherein in at least a first group at least one first branch at least one light emitting diode and at least one second branch does not comprise a light emitting diode and wherein the branches in the other groups at least each comprise a light emitting diode.

Eine Schaltungsanordnung dieser Art ist beispielsweise aus der Druckschrift mit der Veröffentlichungsnummer DE 697 09 206 T2 bekannt. In der genannten Druckschrift ist eine Schaltungsanordnung für Leuchtdioden offenbart, bei welcher in dem zweiten Zweig der ersten Gruppe, das ist der Zweig ohne Leuchtdiode, ein Widerstandselement angeordnet ist. Das Widerstandselement kann mit einer Diode insbesondere auch mit einer Zehnerdiode kombiniert sein. Durch die in dieser Druckschrift beschriebene Schaltungsanordnung ist es möglich, eine Anzahl von N Leuchtdioden in N-Zweigen anzuordnen, wobei die Reihenschaltung der Gruppen insgesamt jedoch M-Zweige mit M größer als N umfasst. Der Nachteil der in der genannten Druckschrift offenbarten Schaltungsanordnung ist jedoch, dass eine symmetrische Stromverteilung innerhalb der Zweige der hintereinander geschalteten Gruppen behindert und damit eine gleichmäßige Stromregelung und in Folge dessen eine gleichmäßige Helligkeitsregelung aller Leuchtdioden erschwert ist.A circuit arrangement of this kind is for example from the publication with the publication number DE 697 09 206 T2 known. In the cited document, a circuit arrangement for light emitting diodes is disclosed in which in the second branch of the first group, that is the branch without light emitting diode, a resistance element is arranged. The resistance element can be combined with a diode in particular also with a Zener diode. By the circuit arrangement described in this document, it is possible to arrange a number of N light-emitting diodes in N branches, wherein the series connection of the groups, however, comprises a total of M branches with M greater than N. The disadvantage of the circuit arrangement disclosed in the cited publication, however, is that a symmetrical current distribution within the branches of the series-connected groups is hindered and thus a uniform current regulation and as a consequence a uniform brightness control of all the LEDs is made more difficult.

Vor dem Hintergrund der Nachteile des Standes der Technik soll die eingangs beschriebene Leuchtdiodenschaltungsanordnung so fortgebildet werden, dass auch bei einem Ausfall der Leuchtdiode in dem ersten Zweig der ersten Gruppe die verbleibenden Leuchtdioden in den übrigen Zweigen weiterhin mit voller Leistung betrieben werden können. Damit soll auch bei Ausfall der Leuchtdiode im ersten Zweig die Funktion der Schaltungsanordnung aufrecht erhalten bleiben.Against the background of the disadvantages of the prior art, the light-emitting diode circuit arrangement described above is to be developed such that even if the light-emitting diode in the first branch of the first group fails, the remaining light-emitting diodes in the remaining branches can continue to be operated at full power. This is intended to maintain the function of the circuit even if the light emitting diode in the first branch fails.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass in dem ersten Zweig der ersten Gruppe in Reihe zu der Leuchtdiode eine erste gesteuerte Stromquelle angeordnet ist.This object is achieved in that in the first branch of the first group in series with the light emitting diode, a first controlled current source is arranged.

Bei einer erfindungsgemäßen Schaltungsanordnung ist die erste gesteuerte Stromquelle dazu gedacht, den Strom durch den ersten Zweig und durch die in dem ersten Zweig angeordnete Leuchtdiode einzustellen. Das Einstellen des Stroms durch die erste Leuchtdiode kann dabei unabhängig von dem Strom durch die übrigen Leuchtdioden erfolgen. Vorteilhaft ist in dem ersten Zweig der ersten Gruppe ein erstes Widerstandsbauelement als Messwiderstand angeordnet, der mit der ersten gesteuerten Stromquelle zur Regelung des Stroms durch den ersten Zweig verbunden ist. Eine erfindungsgemäße Schaltungsanordnung kann mehrere erste Zweige in der ersten Gruppe umfassen.In a circuit arrangement according to the invention, the first controlled current source is intended to adjust the current through the first branch and through the light-emitting diode arranged in the first branch. The adjustment of the current through the first light-emitting diode can be effected independently of the current through the remaining light-emitting diodes. Advantageously, a first resistance component is arranged as a measuring resistor in the first branch of the first group, which is connected to the first controlled current source for regulating the current through the first branch. A circuit arrangement according to the invention may comprise a plurality of first branches in the first group.

Zusätzlich zu der ersten gesteuerten Stromquelle kann die erfindungsgemäße Schaltungsanordnung eine weitere gesteuerte Stromquelle aufweisen. Diese zweite gesteuerte Stromquelle ist vorzugsweise in dem zweiten Zweig der ersten Gruppe angeordnet. In einer zu den in Reihe angeordneten Gruppen führenden Leitung kann dann ein zweites Widerstandsbauelement als Messwiderstand angeordnet sein. Dieses zweite Widerstandsbauelement wirkt mit der zweiten gesteuerten Stromquelle zusammen. Dadurch ist es möglich, den Strom durch die Reihenschaltung der Gruppen zu regeln.In addition to the first controlled current source, the circuit arrangement according to the invention can have a further controlled current source. This second controlled current source is preferably arranged in the second branch of the first group. In a line leading to the groups arranged in series, a second resistance component can then be arranged as a measuring resistor. This second resistance device interacts with the second controlled current source. This makes it possible to regulate the current through the series connection of the groups.

Während der Strom durch die Zweige der weiteren Gruppen und durch den zweiten Zweig der ersten Gruppe im Wesentlichen durch die zweite gesteuerte Stromquelle vorgegeben wird, wird der Strom durch den ersten Zweig durch die erste Stromquelle eingestellt. Der Strom durch den ersten Zweig kann somit unabhängig von den Strömen durch die übrigen Zweige eingestellt werden.While the current through the branches of the further groups and through the second branch of the first group is essentially predetermined by the second controlled current source, the current through the first branch is set by the first current source. The current through the first branch can thus be adjusted independently of the currents through the remaining branches.

Im störungsfreien Betrieb kann mittels der ersten gesteuerten Stromquelle der Strom durch den ersten Zweig der ersten Gruppe auf einen Sollstrom der Leuchtdiode des ersten Zweigs eingestellt werden. Im störungsfreien Betrieb wird ferner mittels der zweiten gesteuerten Stromquelle der Strom durch die Reihenschaltung der Gruppen eingestellt. Der Strom durch die Reihenschaltung der Gruppen kann dabei so eingestellt werden, dass durch jeden Zweig, insbesondere die Zweige der weiteren Gruppen der gleiche Strom fließt.In trouble-free operation, the current through the first branch of the first group can be adjusted to a desired current of the light-emitting diode of the first branch by means of the first controlled current source. In trouble-free operation is further by means of second controlled current source of the current set by the series connection of the groups. The current through the series connection of the groups can be set so that the same current flows through each branch, in particular the branches of the further groups.

Dagegen ist ein Betrieb der erfindungsgemäßen Schaltungsanordnung im Störungsfall, d. h. bei Auswahl der Leuchtdioden im ersten Zweig so möglich, dass mittels der zweiten gesteuerten Stromquelle der Strom durch die Reihenschaltung der weiteren Gruppen so eingestellt wird, so dass der Strom durch die Zweige der weiteren Gruppen genauso groß ist wie im störungsfreien Betrieb. Der Ausfall der Leuchtdiode im ersten Zweig hat somit keine Auswirkung auf den Leuchtdiodenstrom der übrigen Leuchtdioden. Das von den übrigen Leuchtdioden emittierte Licht bleibt somit unbeeinflusst.In contrast, an operation of the circuit arrangement according to the invention in case of failure, ie when selecting the LEDs in the first branch so possible that by means of the second controlled current source, the current through the series circuit of the other groups is set so that the current through the branches of the other groups as well is great as in trouble-free operation. The failure of the light-emitting diode in the first branch thus has no effect on the light-emitting diode current of the remaining light-emitting diodes. The light emitted by the other LEDs thus remains unaffected.

Anhand der beigefügten Zeichnung wird die Erfindung nachfolgend näher erläutert. Es zeigt

Fig. 1
ein Schaltbild des Beispiels für eine erfindungsgemäße Schaltungsanordnung.
Reference to the accompanying drawings, the invention is explained in more detail below. It shows
Fig. 1
a circuit diagram of the example of a circuit arrangement according to the invention.

Die erfindungsgemäße Schaltungsanordnung weist einen Anschluss VCC für das positive Potential der Spannungsversorgung und einen Anschluss GND für das negative Potential der Versorgungsspannung auf. Über diese Anschlüsse VCC, GND ist die erfindungsgemäße Schaltungsanordnung an eine Spannungsquelle, zumeist ein Kraftfahrzeugbordnetz angeschlossen.The circuit arrangement according to the invention has a connection VCC for the positive potential of the voltage supply and a connection GND for the negative potential of the supply voltage. About these connections VCC, GND circuit arrangement according to the invention to a voltage source, usually a motor vehicle electrical system is connected.

Die Schaltungsanordnung umfasst im Wesentlichen sechs Zweige 1, 2, 3, 4, 5, 6, die zu drei Gruppen 1, 2; 3, 4; 5, 6 mit je zwei Zweigen zusammengefasst sind. Die beiden Zweige einer Gruppe sind parallel zueinander geschaltet und die Gruppen sind in Reihe geschaltet.The circuit arrangement essentially comprises six branches 1, 2, 3, 4, 5, 6 belonging to three groups 1, 2; 3, 4; 5, 6 are summarized with two branches. The two branches of a group are connected in parallel and the groups are connected in series.

Die erste Gruppe 1, 2 umfasst die beiden parallel geschalteten Zweige 1, 2, die unter Zwischenschaltung eines Widerstandselements R2sens mit dem Anschluss VCC für das positive Potential der Spannungsquelle verbunden sind. Die dritte Gruppe 5, 6 umfasst die beiden parallel geschalteten Zweige 5, 6, die mit dem negativen Potential GND der Spannungsquelle verbunden sind. Die zweite Gruppe 3, 4 umfasst die beiden parallel geschalteten Zweige 3, 4 die zwischen der ersten Gruppe 1, 2 und der dritten Gruppe 5, 6 angeordnet ist.The first group 1, 2 comprises the two parallel branches 1, 2, which are connected to the connection VCC for the positive potential of the voltage source with the interposition of a resistor element R2sens. The third group 5, 6 comprises the two parallel-connected branches 5, 6, which are connected to the negative potential GND of the voltage source. The second group 3, 4 comprises the two parallel branches 3, 4 which is arranged between the first group 1, 2 and the third group 5, 6.

In dem ersten Zweig 1 der ersten Gruppe 1, 2 ist ein Widerstandselement R1 sens, eine gesteuerte Stromquelle lq1 und eine Leuchtdiode D1 eingesetzt. Das Widerstandselement R1sens dient als Messwiderstand für die gesteuerte Stromquelle Iq1. Der Strom, der Stromquelle Iq1 wird so eingestellt, dass durch den ersten Zweig ein Strom fließt, der dem Soll- beziehungsweise Nennstrom der Leuchtdiode D1 entspricht.In the first branch 1 of the first group 1, 2, a resistance element R1 sens, a controlled current source lq1 and a light emitting diode D1 is used. The resistance element R1sens serves as a measuring resistor for the controlled current source Iq1. The current, the current source Iq1 is adjusted so that a current flows through the first branch, which corresponds to the nominal current of the light emitting diode D1.

In dem zweiten Zweig 2 der ersten Gruppe 1, 2 ist ebenfalls eine gesteuerte Stromquelle lq2 vorgesehen. Neben dieser zweiten gesteuerten Stromquelle lq2 umfasst der zweite Zweig 2 keine weiteren Bauelemente. Die zweite gesteuerte Stromquelle lq2 ist mit dem zweiten Widerstandselement R2sens verbunden. Das zweite Widerstandselement R2sens dient der zweiten gesteuerten Stromquelle lq2 als Messwiderstand. Mit der zweiten gesteuerten Stromquelle lq2 wird ein Strom durch die erste, zweite und dritte Gruppe der Schaltungsanordnung eingestellt.In the second branch 2 of the first group 1, 2, a controlled current source lq2 is also provided. In addition to this second controlled current source Iq2, the second branch 2 comprises no further components. The second controlled current source Iq2 is connected to the second resistance element R2sens. The second resistance element R2sens serves as the second controlled current source Iq2 as a measuring resistor. With the second controlled current source Iq2, a current through the first, second and third group of the circuit arrangement is set.

In den Zweigen 3 bis 6 der zweiten und der dritten Gruppe ist jeweils eine Leuchtdiode D3, D4, D5, D6 angeordnet. Das zweite Widerstandselement R2sens und die zweite gesteuerte Stromquelle lq2 sind so aufeinander abgestimmt beziehungsweise eingestellt, dass durch alle Leuchtdioden der gleiche Strom fließt.In the branches 3 to 6 of the second and the third group, a light-emitting diode D3, D4, D5, D6 is arranged in each case. The second resistance element R2sens and the second controlled current source lq2 are coordinated or adjusted to one another such that the same current flows through all the light-emitting diodes.

Bei einem Ausfall der Leuchtdiode D1 im ersten Zweig 1 der ersten Gruppe sorgt die zweite gesteuerte Stromquelle lq2 dafür, dass die übrigen Leuchtdioden D3 bis D6 unbeeinflusst mit dem gleichen Strom versorgt werden. Dadurch wird die Lichtemittierung aufrecht erhalten.In the event of a failure of the light-emitting diode D1 in the first branch 1 of the first group, the second controlled current source lq2 ensures that the remaining light-emitting diodes D3 to D6 are supplied with the same current uninfluenced. As a result, the light emission is maintained.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

VCCVCC
Anschluss für das positive Potential der SpannungsquelleConnection for the positive potential of the voltage source
GNDGND
Anschluss für das negative Potential der SpannungsquelleConnection for the negative potential of the voltage source
R1sensR1sens
erster Messwiderstandfirst measuring resistor
R2sensR2sens
zweiter Messwiderstandsecond measuring resistor
lq1LQ1
erste gesteuerte Stromquellefirst controlled current source
lq2LQ2
zweite gesteuerte Stromquellesecond controlled current source
D1D1
Leuchtdioden des ersten Zweigs der ersten GruppeLEDs of the first branch of the first group
D2 bis D6D2 to D6
Leuchtdiode der Zweige der weiteren GruppenLED of branches of further groups
1 bis 61 to 6
Zweige der SchaltungsanordnungBranches of the circuit arrangement

Claims (8)

  1. Light diode circuitry arrangement comprising groups (1, 2; 3, 4; 5, 6) of parallel paths (1 to 6), wherein the groups (1, 2; 3, 4; 5, 6) are arranged in series, wherein at least in a first group (1, 2) at least a first path (1) comprises at least one light diode (D1), and at least one second path (2) comprises no light diode, and wherein the paths (3 to 6) in the further groups (3,4; 5, 6) comprise at least one light diode (D3 to D6) each,
    characterized in that
    in the first path (1) of the first group (1, 2) a first controlled current source (Iq1) is arranged in series relative to the light diode (D1).
  2. Light diode circuitry arrangement according to Claim 1, characterized in that in the first path (1) of the first group (1,2) a first resistor element (R1sens) is arranged as a measuring resistor being connected with the first controlled current source (Iq1) for the control of the current by means of the first path (1).
  3. Light diode circuitry arrangement according to Claim 1 or 2, characterized in that a second controlled current source (Iq2) is arranged in the second path (2) of the first group (1, 2).
  4. Light diode circuitry arrangement according to Claim 3, characterized in that in a line leading to the groups (3, 4; 5, 6) arranged in series, a second resistor element (R2sens) is arranged as measuring resistor being connected with the second controlled current source (Iq2) for the control of the current by means of a series-connection of the groups (1, 2; 3, 4; 5, 6).
  5. Procedure for the operation of a light diode circuitry arrangement according to one of the Claims 1 to 4, characterized in that in fault-free operation, the current is adjusted to a set current of the light diode (D1) of the first path (1) by the first path (1) of the first group (1; 2) by means of the first controlled current source (Iq1).
  6. Procedure according to Claim 5, characterized in that in fault-free operation, the current is adjusted by the series connection of the groups (1, 2; 3, 4; 5, 6) by means of the second controlled current source (Iq2).
  7. Procedure according to Claim 6, characterized in that the current is adjusted by the series connection of the groups (1, 2; 3, 4; 5, 6) so that the same current flows through each path (1 to 6) especially of the further groups (3, 4; 5, 6).
  8. Procedure according to one of the Claims 5 to 7, characterized in that in case of a failure of the light diode (D1) of the first path (1), the current is adjusted by the series connection (3, 4; 5, 6) of the further groups by means of the second controlled current source (Iq2) so that the current flowing through the paths (3 to 6) of the further groups (3, 4; 5, 6) is as large as during fault-free operation.
EP08100163.8A 2007-01-11 2008-01-07 LED-circuit having series-connected groups of parallel-connected LED-strings. Active EP1945006B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007001716.4A DE102007001716B4 (en) 2007-01-11 2007-01-11 Light-emitting diode circuit arrangement and method for operating a light-emitting diode circuit arrangement

Publications (3)

Publication Number Publication Date
EP1945006A2 EP1945006A2 (en) 2008-07-16
EP1945006A3 EP1945006A3 (en) 2013-12-04
EP1945006B1 true EP1945006B1 (en) 2015-02-25

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EP08100163.8A Active EP1945006B1 (en) 2007-01-11 2008-01-07 LED-circuit having series-connected groups of parallel-connected LED-strings.

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DE (1) DE102007001716B4 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105493629B (en) 2013-08-28 2018-05-15 艾尔默斯半导体股份公司 For the device at least one customer offer electric energy or for providing electrical power at least one customer
DE102014012789B4 (en) 2014-08-27 2023-08-24 Elmos Semiconductor Se Device for regulating the operating current of an LED lighting unit
DE102014012790B4 (en) 2014-08-27 2023-08-24 Elmos Semiconductor Se Process for controlling the operating current of a bridge circuit
DE102014012787A1 (en) 2014-08-27 2016-03-17 Elmos Semiconductor Aktiengesellschaft Method for controlling the operating current of an LED lamp unit

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9313820U1 (en) * 1993-09-13 1994-01-20 Gebensleben, Enno, 22547 Hamburg Bicycle lights
US5765940A (en) * 1995-10-31 1998-06-16 Dialight Corporation LED-illuminated stop/tail lamp assembly
FR2745458B1 (en) 1996-02-28 1998-04-10 Valeo Electronique IMPROVEMENT ON ILLUMINATION CIRCUITS WITH LIGHT EMITTING DIODES, PARTICULARLY FOR MOTOR VEHICLES, SIGNALING LIGHT AND CONTROL PANEL INCORPORATING THE SAME
DE10025810B4 (en) * 2000-05-24 2014-01-23 SMR Patents S.à.r.l. Luminaire unit, in particular for exterior rearview mirrors of vehicles, preferably motor vehicles
JP2004090858A (en) * 2002-09-03 2004-03-25 Toyoda Gosei Co Ltd Stop lamp
US7202608B2 (en) * 2004-06-30 2007-04-10 Tir Systems Ltd. Switched constant current driving and control circuit

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Publication number Publication date
DE102007001716A1 (en) 2008-07-17
EP1945006A2 (en) 2008-07-16
DE102007001716B4 (en) 2015-11-05
EP1945006A3 (en) 2013-12-04

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