EP3525552A1 - Circuit arrangement for switching on and off at least two light strands for a vehicle headlight electrically connected in parallel - Google Patents

Circuit arrangement for switching on and off at least two light strands for a vehicle headlight electrically connected in parallel Download PDF

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Publication number
EP3525552A1
EP3525552A1 EP18155962.6A EP18155962A EP3525552A1 EP 3525552 A1 EP3525552 A1 EP 3525552A1 EP 18155962 A EP18155962 A EP 18155962A EP 3525552 A1 EP3525552 A1 EP 3525552A1
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EP
European Patent Office
Prior art keywords
light
parallel
circuit arrangement
strands
light string
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EP18155962.6A
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German (de)
French (fr)
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EP3525552B1 (en
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Christian Guth
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ZKW Group GmbH
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ZKW Group GmbH
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Priority to EP18155962.6A priority Critical patent/EP3525552B1/en
Priority to CN201910103130.0A priority patent/CN110139421A/en
Publication of EP3525552A1 publication Critical patent/EP3525552A1/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
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • 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]
    • 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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits

Definitions

  • the invention relates to a circuit arrangement for alternately switching on and off at least two electrically parallel-connected light strands for a vehicle headlamp, comprising a parallel circuit, comprising at least two electrically connected light strands, each luminous strand consists of a number of electrically connected in series light sources, at least one energy source for supplying the parallel circuit, wherein a first of the at least two electrically paralleled light strands having a work area with a lower voltage limit and an upper voltage limit for operation of the first light string, and wherein a second of the at least two electrically connected in parallel lighting strands a work area with a lower voltage limit and an upper voltage limit Operation of the second light string, wherein the upper voltage limit of the first light string below the lower voltage limit of second light string, wherein the first light string is connected in series with a switching element.
  • the invention relates to a lighting device with a circuit arrangement according to the invention and a vehicle headlight with a lighting device according to the invention.
  • the parallel circuit is connected to the power source and / or the power source is designed such that in a conductive state of the switching element, the voltage applied to the parallel circuit voltage within the working range of the first Luminous strand is located and thereby the first light string is turned on and the second light string is turned off, and that raised in a non-conductive state of the switching element, the voltage applied to the parallel circuit voltage to the working area of the second light string and thus turned off the first light string and the second light string is turned on.
  • a number of in the context of this disclosure, unless otherwise stated, means a number which may, for example, be one, two, three, four or more, in particular six, eight, ten, twelve or more than twelve. The person skilled in the art is able to select the number of the respective light sources according to the intended use of the circuit arrangement.
  • all light sources of the light strands LEDs are of identical construction and, in particular, are equipped with a defined forward voltage.
  • the number of LEDs connected in series in the light strands deviates from one another, wherein it may be provided, in particular, that the LEDs of all the light strands are identical in construction. This way you can be very efficient and easy way light strands are created, which have different work areas in terms of their operating voltage.
  • the number of LEDs connected in series in the at least two light strands is the same, the forward voltages of the LEDs of the two light strands differing from one another in such a way that the voltage upper limit of the first light stripe is below the lower voltage limit the second light string is located.
  • the energy source is a constant current source.
  • the strings may have the same rated current, and the output current of the constant current source may be rated current, so that only one string at a time can be supplied.
  • the switching element is a relay or a transistor, in particular a MOSFET or a bipolar transistor.
  • the switching voltage of the switching element is between 5 V and 24V.
  • the voltage applied to the parallel circuit by the energy source is between 2 and 60 V, in particular between 5 and 24V. This operating range is particularly advantageous for use in the automotive sector.
  • the invention further relates to lighting device, comprising at least one circuit arrangement according to the invention, and a vehicle headlight, in particular a motor vehicle headlight, comprising a lighting device according to the invention.
  • FIG. 1 shows a circuit arrangement 1 according to the invention.
  • the circuit arrangement 1 is arranged for the mutual switching on and off of at least two electrically parallel switched light strands 2 and 3 for a vehicle headlamp and comprises a parallel circuit 4, comprising at least two electrically parallel light strands, namely a first light stripe 2 and a second light stripe 3, and at least an energy source 5 for supplying the parallel circuit 4.
  • the first light string 2 has a work area with a lower voltage limit and an upper voltage limit to the operation of the first light string, by the sums of lower voltage limits or voltage upper limits of the series-connected light sources 7, in particular can be designed as LEDs are given.
  • the second light string 3 has a relation to the first light string 2 increased number of light sources and thus the lower voltage limit and upper limit voltage for operation of the second light string 3 is correspondingly higher than in the first light string 2.
  • the number and voltage values of the lighting means are selected so that the lower voltage limit of the second light string 3 is above the upper voltage limit of the first light string 2.
  • the first light string 2 is connected in series with a switching element 6, which is adapted to be switched via an external switching signal S ext between an electrically conductive and an electrically blocking state.
  • the parallel circuit 4 is so connected to the power source 5 and / or the power source 5 is designed such that in a conductive state of the switching element 6, the voltage applied to the parallel circuit 4 U p is within the working range of the first light string 2 and thereby the first light string 2 turned on and the second light string 3 is turned off, and that raised in a non-conductive state of the switching element 6 applied to the parallel circuit voltage Up 4 to the working area of the second light string 3 and thus the first light string 2 off and the second light string 3 is turned on.
  • the switching on of the switching element 6 causes the voltage of the constant current source to adjust such that the rated current flows into the first string 2.
  • the voltage will therefore be between 13.5 V and 17.5 V and will not exceed this value, since the rated current I N is already flowing. Only in the case of switching off the switching element 6, this will interrupt the connection with the first light string 2, whereby the voltage Up is increased until the rated current I N flows through the second strand 3. The voltage Up is now within the working range of the second light string 3.

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

Abstract

Die Erfindung betrifft eine Schaltungsanordnung (1) zum wechselseitigen Ein- und Ausschalten zumindest zweier elektrisch parallel geschalteter Leuchtstränge für einen Fahrzeugscheinwerfer, umfassend eine Parallelschaltung, aufweisend zumindest zwei elektrisch parallel geschaltete Leuchtstränge, wobei jeder Leuchtstrang aus einer Anzahl miteinander elektrisch in Serie geschalteten Lichtquellen (7) besteht, zumindest eine Energiequelle (5) zur Versorgung der Parallelschaltung (4), wobei die Parallelschaltung (4) mit der Energiequelle (5) dergestalt verbunden ist und/oder die Energiequelle (5) dergestalt ausgelegt ist, dass in einem leitenden Zustand des Schaltelements (6) die an der Parallelschaltung (4) anliegende Spannung innerhalb des Arbeitsbereichs des ersten Leuchtstranges (2) liegt und dadurch der erste Leuchtstrang (2) eingeschaltet und der zweite Leuchtstrang (3) ausgeschaltet ist, und dass in einem nichtleitenden Zustand des Schaltelements (6) die an der Parallelschaltung (4) anliegende Spannung hin zu den Arbeitsbereich des zweiten Leuchtstranges (3) angehoben und damit der erste Leuchtstrang (2) ausgeschaltet und der zweite Leuchtstrang (3) eingeschaltet ist.The invention relates to a circuit arrangement (1) for mutually switching on and off at least two electrically parallel-connected light strands for a vehicle headlamp, comprising a parallel circuit comprising at least two light strands connected electrically in parallel, each luminous strands being composed of a number of light sources (7) connected electrically in series ), at least one energy source (5) for supplying the parallel circuit (4), wherein the parallel circuit (4) to the power source (5) is connected in such and / or the energy source (5) is designed such that in a conductive state of the Switching element (6) which is connected to the parallel circuit (4) voltage within the working range of the first light string (2) and thereby the first light string (2) turned on and the second light string (3) is turned off, and that in a non-conductive state of the switching element (6) connected to the parallel circuit (4 ) applied voltage to the working area of the second light string (3) and thus the first light string (2) turned off and the second light string (3) is turned on.

Description

Die Erfindung betrifft eine Schaltungsanordnung zum wechselseitigen Ein- und Ausschalten zumindest zweier elektrisch parallel geschalteter Leuchtstränge für einen Fahrzeugscheinwerfer, umfassend eine Parallelschaltung, aufweisend zumindest zwei elektrisch parallel geschaltete Leuchtstränge, wobei jeder Leuchtstrang aus einer Anzahl miteinander elektrisch in Serie geschalteten Lichtquellen besteht, zumindest eine Energiequelle zur Versorgung der Parallelschaltung, wobei ein erster der zumindest zwei elektrisch parallel geschalteten Leuchtstränge einen Arbeitsbereich mit einer Spannungsuntergrenze und einer Spannungsobergrenze zum Betrieb des ersten Leuchtstranges aufweist, und wobei ein zweiter der zumindest zwei elektrisch parallel geschalteten Leuchtstränge einen Arbeitsbereich mit einer Spannungsuntergrenze und einer Spannungsobergrenze zum Betrieb des zweiten Leuchtstranges aufweist, wobei die Spannungsobergrenze des ersten Leuchtstranges unterhalb der Spannungsuntergrenze des zweiten Leuchtstranges liegt, wobei der erste Leuchtstrang mit einem Schaltelement in Serie geschaltet ist.The invention relates to a circuit arrangement for alternately switching on and off at least two electrically parallel-connected light strands for a vehicle headlamp, comprising a parallel circuit, comprising at least two electrically connected light strands, each luminous strand consists of a number of electrically connected in series light sources, at least one energy source for supplying the parallel circuit, wherein a first of the at least two electrically paralleled light strands having a work area with a lower voltage limit and an upper voltage limit for operation of the first light string, and wherein a second of the at least two electrically connected in parallel lighting strands a work area with a lower voltage limit and an upper voltage limit Operation of the second light string, wherein the upper voltage limit of the first light string below the lower voltage limit of second light string, wherein the first light string is connected in series with a switching element.

Weiters betrifft die Erfindung eine Leuchtvorrichtung mit einer erfindungsgemäßen Schaltungsanordnung sowie einen Fahrzeugscheinwerfer mit einer erfindungsgemäßen Leuchtvorrichtung.Furthermore, the invention relates to a lighting device with a circuit arrangement according to the invention and a vehicle headlight with a lighting device according to the invention.

Aus dem Stand der Technik sind Schaltungsanordnungen bekannt geworden, bei denen jedem Lichtquellenstrang ein Schaltelement zum Ein- und Ausschalten desselben zugeordnet ist. Um einen Lichtwechsel von einem Strang auf einen anderen Strang zu bewerkstelligen, war es bisher erforderlich, dass zwei Signale übertragen werden müssen, nämlich ein erstes Schaltsignal zum Deaktivieren des Schaltelements eines ersten Stranges und ein zweites Schaltsignal zum Aktivieren des Schaltelements eines zweiten Stranges. Alternative Bauweisen, die z.B. durch Wechselschalter umfassen könnten, sind entweder für Fahrzeugscheinwerferanwendungen ungeeignet, oder kostenintensiv.Circuit arrangements have become known from the prior art in which each light source strand is assigned a switching element for switching it on and off. In order to effect a light change from one strand to another strand, it has hitherto been necessary for two signals to be transmitted, namely a first switching signal for deactivating the switching element of a first strand and a second switching signal for activating the switching element of a second strand. Alternative designs, which could include, for example, change-over switches, are either unsuitable for vehicle headlamp applications or costly.

Eine Aufgabe der Erfindung besteht daher darin, eine zuverlässige und kostengünstige Schaltungsanordnung zu schaffen, die es ermöglicht anhand des Vorliegens lediglich eines einzigen Schaltsignals einen Wechsel des Betriebs zumindest zweier Stränge zu bewirken.It is therefore an object of the invention to provide a reliable and cost-effective circuit arrangement which makes it possible to effect a change in the operation of at least two strings on the basis of the presence of only a single switching signal.

Diese Aufgabe wird durch eine Schaltungsanordnung der eingangs genannten Art gelöst, bei der erfindungsgemäß die Parallelschaltung mit der Energiequelle dergestalt verbunden ist und/oder die Energiequelle dergestalt ausgelegt ist, dass in einem leitenden Zustand des Schaltelements die an der Parallelschaltung anliegende Spannung innerhalb des Arbeitsbereichs des ersten Leuchtstranges liegt und dadurch der erste Leuchtstrang eingeschaltet und der zweite Leuchtstrang ausgeschaltet ist, und dass in einem nichtleitenden Zustand des Schaltelements die an der Parallelschaltung anliegende Spannung hin zu den Arbeitsbereich des zweiten Leuchtstranges angehoben und damit der erste Leuchtstrang ausgeschaltet und der zweite Leuchtstrang eingeschaltet ist.This object is achieved by a circuit arrangement of the type mentioned, in which according to the invention the parallel circuit is connected to the power source and / or the power source is designed such that in a conductive state of the switching element, the voltage applied to the parallel circuit voltage within the working range of the first Luminous strand is located and thereby the first light string is turned on and the second light string is turned off, and that raised in a non-conductive state of the switching element, the voltage applied to the parallel circuit voltage to the working area of the second light string and thus turned off the first light string and the second light string is turned on.

Dadurch kann auf das Vorsehen eines zweiten Schaltelements verzichtet werden, indem ermöglicht wird, bereits durch ein einziges Schaltelement, das lediglich zwischen den Zuständen "leitend" und "nicht leitend" geschaltet werden kann, das wechselweise Schalten zwischen zumindest zwei Strängen zu ermöglichen, wobei zur Ansteuerung lediglich eine einzige Signalleitung, die sich auf ein Bezugspotential bezieht (z.B. Massepotential in einem Fahrzeug) ausreicht.This makes it possible to dispense with the provision of a second switching element by making it possible already by a single switching element, which can be switched only between the states "conductive" and "non-conductive", the alternating switching between at least two strands, wherein the Control only a single signal line, which refers to a reference potential (eg ground potential in a vehicle) is sufficient.

Unter dem Ausdruck "eine Anzahl von" wird im Rahmen dieser Offenbarung - sofern nicht anders angegeben - eine Anzahl verstanden, die beispielsweise eins, zwei, drei, vier oder mehr, insbesondere sechs, acht, zehn, zwölf oder mehr als zwölf betragen kann. Der Fachmann ist in der Lage, die Anzahl der jeweiligen Lichtquellen angepasst an den Einsatzweck der Schaltungsanordnung entsprechend zu wählen.The term "a number of" in the context of this disclosure, unless otherwise stated, means a number which may, for example, be one, two, three, four or more, in particular six, eight, ten, twelve or more than twelve. The person skilled in the art is able to select the number of the respective light sources according to the intended use of the circuit arrangement.

Vorzugsweise kann vorgesehen sein, dass sämtliche Lichtquellen der Leuchtstränge LEDs baugleich und insbesondere mit festgelegter Durchlassspannung ausgestattet sind.It can preferably be provided that all light sources of the light strands LEDs are of identical construction and, in particular, are equipped with a defined forward voltage.

Zudem kann vorgesehen sein, dass die Anzahl der in den Leuchtsträngen in Serie geschalteten LEDs voneinander abweicht, wobei insbesondere vorgesehen sein kann, dass die LEDs sämtlicher Leuchtstränge baugleich sind. Auf diese Weise können auf sehr effiziente und einfache Weise Leuchtstränge geschaffen werden, die unterschiedliche Arbeitsbereiche hinsichtlich ihrer Betriebsspannung aufweisen.In addition, it can be provided that the number of LEDs connected in series in the light strands deviates from one another, wherein it may be provided, in particular, that the LEDs of all the light strands are identical in construction. This way you can be very efficient and easy way light strands are created, which have different work areas in terms of their operating voltage.

Alternativ dazu kann vorgesehen sein, dass die Anzahl der in den zumindest zwei Leuchtsträngen in Serie geschalteten LEDs gleich ist, wobei die Durchlassspannungen der LEDs der zwei Leuchtstränge voneinander abweichen, und zwar auf eine Weise, dass die wobei die Spannungsobergrenze des ersten Leuchtstranges unterhalb der Spannungsuntergrenze des zweiten Leuchtstranges liegt.Alternatively, it can be provided that the number of LEDs connected in series in the at least two light strands is the same, the forward voltages of the LEDs of the two light strands differing from one another in such a way that the voltage upper limit of the first light stripe is below the lower voltage limit the second light string is located.

Zudem kann vorgesehen sein, dass Energiequelle eine Konstantstromquelle ist. Auf diese Weise kann z.B. eine Anordnung besonders einfach realisiert werden, in der im Falle eines Einschaltens des ersten Stranges der gesamte durch die Energiequelle gelieferte Strom durch den ersten Strang aufgenommen wird und dementsprechend die an der Parallelschaltung anliegende Spannung im Arbeitsbereich des ersten Stranges liegt. Beispielsweise können die Stränge gleichen Nennstrom aufweisen, und der Ausgangsstrom der Konstantstromquelle kann Nennstrom betragen, sodass immer nur ein Strang zur selben Zeit versorgt werden kann.In addition, it can be provided that the energy source is a constant current source. In this way, e.g. an arrangement can be realized in a particularly simple manner, in which, in the case of switching on the first strand of the entire supplied by the power source current is absorbed by the first strand and, accordingly, the voltage applied to the parallel circuit voltage in the working range of the first strand. For example, the strings may have the same rated current, and the output current of the constant current source may be rated current, so that only one string at a time can be supplied.

Günstigerweise kann vorgesehen sein, dass das Schaltelement ein Relais oder ein Transistor, insbesondere ein MOSFET- oder ein Bipolar-Transistor, ist.Conveniently, it can be provided that the switching element is a relay or a transistor, in particular a MOSFET or a bipolar transistor.

Zudem kann vorgesehen sein, dass die Schaltspannung des Schaltelements zwischen 5 V und 24V beträgt.In addition, it can be provided that the switching voltage of the switching element is between 5 V and 24V.

Zudem kann vorgesehen sein, dass die durch die Energiequelle zur Verfügung gestellte an der Parallelschaltung anliegende Spannung zwischen 2 und 60 V, insbesondere zwischen 5 und 24V, beträgt. Dieser Betriebsbereich ist insbesondere für die Anwendung im Automobilbereich vorteilhaft.In addition, it can be provided that the voltage applied to the parallel circuit by the energy source is between 2 and 60 V, in particular between 5 and 24V. This operating range is particularly advantageous for use in the automotive sector.

Die Erfindung betrifft ferner Leuchtvorrichtung, umfassend zumindest eine erfindungsgemäße Schaltungsanordnung, sowie einen Fahrzeugscheinwerfer, insbesondere einen Kraftfahrzeugscheinwerfer, umfassend eine erfindungsgemäße Leuchtvorrichtung.The invention further relates to lighting device, comprising at least one circuit arrangement according to the invention, and a vehicle headlight, in particular a motor vehicle headlight, comprising a lighting device according to the invention.

Die Erfindung ist im Folgenden anhand einer beispielhaften und nicht einschränkenden Ausführungsform näher erläutert, die in der Figur veranschaulicht ist. Darin zeigt

  • Figur 1 eine schematische Darstellung einer erfindungsgemäßen Schaltungsanordnung.
The invention is explained in more detail below with reference to an exemplary and non-limiting embodiment, which is illustrated in the figure. It shows
  • FIG. 1 a schematic representation of a circuit arrangement according to the invention.

Figur 1 zeigt eine Schaltungsanordnung 1 gemäß der Erfindung. Die Schaltungsanordnung 1 ist zum wechselseitigen Ein- und Ausschalten zumindest zweier elektrisch parallel geschalteter Leuchtstränge 2 und 3 für einen Fahrzeugscheinwerfer eingerichtet und umfasst eine Parallelschaltung 4, aufweisend zumindest zwei elektrisch parallel geschaltete Leuchtstränge, nämlich eines ersten Leuchtstranges 2 und eines zweiten Leuchtstranges 3, und zumindest eine Energiequelle 5 zur Versorgung der Parallelschaltung 4. Der erste Leuchtstrang 2 weist einen Arbeitsbereich mit einer Spannungsuntergrenze und einer Spannungsobergrenze zum Betrieb des ersten Leuchtstranges auf, die durch die Summen der Spannungsuntergrenzen bzw. Spannungsobergrenzen der in dem Strang in Serie geschalteten Lichtquellen 7, die insbesondere als LEDs ausgeführt sein können, gegeben sind. FIG. 1 shows a circuit arrangement 1 according to the invention. The circuit arrangement 1 is arranged for the mutual switching on and off of at least two electrically parallel switched light strands 2 and 3 for a vehicle headlamp and comprises a parallel circuit 4, comprising at least two electrically parallel light strands, namely a first light stripe 2 and a second light stripe 3, and at least an energy source 5 for supplying the parallel circuit 4. The first light string 2 has a work area with a lower voltage limit and an upper voltage limit to the operation of the first light string, by the sums of lower voltage limits or voltage upper limits of the series-connected light sources 7, in particular can be designed as LEDs are given.

Gleiches trifft in analoger Weise auf den zweiten Leuchtstrang 3 zu, wobei der zweite Leuchtstrang eine gegenüber dem ersten Leuchtstrang 2 erhöhte Anzahl von Lichtquellen aufweist und damit die Spannungsuntergrenze und Spannungsobergrenze zum Betrieb des zweiten Leuchtstrangs 3 entsprechend höher als bei dem ersten Leuchtstrang 2 ist. Konkret sind Anzahl und Spannungswerte der Leuchtmittel so gewählt, dass die Spannungsuntergrenze des zweiten Leuchtstranges 3 oberhalb der Spannungsobergrenze des ersten Leuchtstranges 2 liegt.The same applies in an analogous manner to the second light string 3, wherein the second light string has a relation to the first light string 2 increased number of light sources and thus the lower voltage limit and upper limit voltage for operation of the second light string 3 is correspondingly higher than in the first light string 2. Specifically, the number and voltage values of the lighting means are selected so that the lower voltage limit of the second light string 3 is above the upper voltage limit of the first light string 2.

Der erste Leuchtstrang 2 ist mit einem Schaltelement 6 in Serie geschaltet, das dazu eingerichtet ist, über ein externes Schaltsignal Sext zwischen einen elektrisch leitendenden und einen elektrisch sperrenden Zustand geschaltet zu werden.The first light string 2 is connected in series with a switching element 6, which is adapted to be switched via an external switching signal S ext between an electrically conductive and an electrically blocking state.

Die Parallelschaltung 4 ist mit der Energiequelle 5 dergestalt verbunden und/oder die Energiequelle 5 ist dergestalt ausgelegt, dass in einem leitenden Zustand des Schaltelements 6 die an der Parallelschaltung 4 anliegende Spannung Up innerhalb des Arbeitsbereichs des ersten Leuchtstranges 2 liegt und dadurch der erste Leuchtstrang 2 eingeschaltet und der zweite Leuchtstrang 3 ausgeschaltet ist, und dass in einem nichtleitenden Zustand des Schaltelements 6 die an der Parallelschaltung 4 anliegende Spannung Up hin zu den Arbeitsbereich des zweiten Leuchtstranges 3 angehoben und damit der erste Leuchtstrang 2 ausgeschaltet und der zweite Leuchtstrang 3 eingeschaltet ist. Beispielsweise kann bei Verwendung von fünf LED Lichtquellen im ersten Leuchtstrang 2 die Summenvorwärtsspannung, also der Arbeitsbereich des ersten Leuchtstranges 2, zwischen 13,5 V und 17,5 V (die Spannungsuntergrenze beträgt hier demnach 13,5 V und die Spannungsobergrenze beträgt demnach 17,5 V) betragen und bei Verwendung von zehn LED Lichtquellen im zweiten Leuchtstrang 3 der Arbeitsbereich des zweiten Leuchtstranges entsprechend zwischen 27 V und 35V (die Spannungsuntergrenze beträgt hier demnach 27 V und die Spannungsobergrenze beträgt demnach 35 V) liegen. Werden solche Stränge z.B. über eine Konstantstromquelle versorgt, dessen Ausgangsstrom gleich dem Nennstrom eines Stranges ist, so bewirkt ein Durchschalten des Schaltelements 6, dass sich die Spannung der Konstantstromquelle derart einstellt, dass der Nennstrom in den ersten Strang 2 fließt. Die Spannung wird daher zwischen 13,5 V und 17,5 V betragen und diesen Wert nicht übersteigen, da bereits der Nennstrom IN fließt. Erst im Falle eines Ausschaltens des Schaltelements 6 wird dieses die Verbindung mit dem ersten Leuchtstrang 2 unterbrechen, wodurch die Spannung Up erhöht wird, bis der Nennstrom IN durch den zweiten Strang 3 fließt. Die Spannung Up liegt nun innerhalb des Arbeitsbereichs des zweiten Leuchtstranges 3.The parallel circuit 4 is so connected to the power source 5 and / or the power source 5 is designed such that in a conductive state of the switching element 6, the voltage applied to the parallel circuit 4 U p is within the working range of the first light string 2 and thereby the first light string 2 turned on and the second light string 3 is turned off, and that raised in a non-conductive state of the switching element 6 applied to the parallel circuit voltage Up 4 to the working area of the second light string 3 and thus the first light string 2 off and the second light string 3 is turned on. For example, when using five LED light sources in the first light string 2, the sum forward voltage, ie the working range of the first light string 2, between 13.5 V and 17.5 V (the voltage lower limit is therefore 13.5 V and the upper voltage limit is therefore 17, 5 V) and when using ten LED light sources in the second light string 3, the working range of the second light string corresponding to between 27 V and 35V (the lower voltage limit is therefore 27 V and the upper voltage limit is therefore 35 V). If such strings are supplied, for example, via a constant current source whose output current is equal to the nominal current of a string, switching on of the switching element 6 causes the voltage of the constant current source to adjust such that the rated current flows into the first string 2. The voltage will therefore be between 13.5 V and 17.5 V and will not exceed this value, since the rated current I N is already flowing. Only in the case of switching off the switching element 6, this will interrupt the connection with the first light string 2, whereby the voltage Up is increased until the rated current I N flows through the second strand 3. The voltage Up is now within the working range of the second light string 3.

In Anbetracht dieser Lehre ist der Fachmann in der Lage, ohne erfinderisches Zutun zu anderen, nicht gezeigten Ausführungsformen der Erfindung zu gelangen. Die Erfindung ist daher nicht auf die gezeigte Ausführungsform beschränkt. Auch können einzelne Aspekte der Erfindung bzw. der Ausführungsform aufgegriffen und miteinander kombiniert werden. Wesentlich sind die der Erfindung zugrunde liegenden Gedanken, die durch einen Fachmann in Kenntnis dieser Beschreibung in mannigfaltiger Weise ausgeführt werden können und trotzdem als solche aufrechterhalten bleiben. Etwaige Bezugszeichen in den Ansprüchen sind beispielhaft und dienen nur der einfacheren Lesbarkeit der Ansprüche, ohne diese einzuschränken.In view of this teaching, one skilled in the art will be able to arrive at other, not shown embodiments of the invention without inventive step. The invention is therefore not limited to the embodiment shown. Also, individual aspects of the invention or the embodiment can be taken up and combined with each other. Essential are the ideas underlying the invention, which can be performed by a person skilled in the knowledge of this description in a variety of ways and still remain maintained as such. Any reference numbers in the claims are exemplary and are only for ease of reading the claims without limiting.

Claims (11)

Schaltungsanordnung (1) zum wechselseitigen Ein- und Ausschalten zumindest zweier elektrisch parallel geschalteter Leuchtstränge für einen Fahrzeugscheinwerfer, umfassend - eine Parallelschaltung, aufweisend zumindest zwei elektrisch parallel geschaltete Leuchtstränge, wobei jeder Leuchtstrang aus einer Anzahl miteinander elektrisch in Serie geschalteten Lichtquellen (7) besteht, - zumindest eine Energiequelle (5) zur Versorgung der Parallelschaltung (4), wobei ein erster (2) der zumindest zwei elektrisch parallel geschalteten Leuchtstränge (2, 3) einen Arbeitsbereich mit einer Spannungsuntergrenze und einer Spannungsobergrenze zum Betrieb des ersten Leuchtstranges (2) aufweist,
und wobei ein zweiter (3) der zumindest zwei elektrisch parallel geschalteten Leuchtstränge (2, 3) einen Arbeitsbereich mit einer Spannungsuntergrenze und einer Spannungsobergrenze zum Betrieb des zweiten Leuchtstranges (3) aufweist,
wobei die Spannungsobergrenze des ersten Leuchtstranges (2) unterhalb der Spannungsuntergrenze des zweiten Leuchtstranges (3) liegt, wobei der erste Leuchtstrang mit einem Schaltelement (6) in Serie geschaltet ist,
dadurch gekennzeichnet, dass die Parallelschaltung (4) mit der Energiequelle (5) dergestalt verbunden ist und/oder die Energiequelle (5) dergestalt ausgelegt ist, - dass in einem leitenden Zustand des Schaltelements (6) die an der Parallelschaltung (4) anliegende Spannung innerhalb des Arbeitsbereichs des ersten Leuchtstranges (2) liegt und dadurch der erste Leuchtstrang (2) eingeschaltet und der zweite Leuchtstrang (3) ausgeschaltet ist, und - dass in einem nichtleitenden Zustand des Schaltelements (6) die an der Parallelschaltung (4) anliegende Spannung hin zu den Arbeitsbereich des zweiten Leuchtstranges (3) angehoben und damit der erste Leuchtstrang (2) ausgeschaltet und der zweite Leuchtstrang (3) eingeschaltet ist. Circuit arrangement (1) for the mutual switching on and off of at least two electrically parallel connected light strands for a vehicle headlamp, comprising a parallel circuit comprising at least two light strands connected electrically in parallel, each luminous strand consisting of a number of light sources (7) electrically connected in series with each other, at least one energy source (5) for supplying the parallel circuit (4), wherein a first (2) of the at least two light-emitting strands (2, 3) connected electrically in parallel has a working area with a lower voltage limit and an upper voltage limit for operating the first light-bar (2),
and wherein a second (3) of the at least two light-emitting strands (2, 3) connected electrically in parallel has a working region with a lower voltage limit and an upper voltage limit for operating the second light-emitting strand (3),
wherein the upper voltage limit of the first light string (2) is below the lower voltage limit of the second light string (3), wherein the first light string is connected in series with a switching element (6),
characterized in that the parallel circuit (4) is connected to the energy source (5) in such a way and / or the energy source (5) is designed in such a way, - That in a conductive state of the switching element (6) at the parallel circuit (4) voltage is within the working range of the first light string (2) and thereby the first light string (2) turned on and the second light string (3) is turned off, and - That in a non-conductive state of the switching element (6) at the parallel circuit (4) voltage raised to the working area of the second light string (3) and thus the first light string (2) turned off and the second light string (3) is turned on. Schaltungsanordnung (1) nach Anspruch 1, wobei sämtliche Lichtquellen (7) der Leuchtstränge LEDs sind.Circuit arrangement (1) according to claim 1, wherein all light sources (7) of the light strands are LEDs. Schaltungsanordnung (1) nach Anspruch 2, wobei die LEDs sämtlicher Leuchtstränge (2, 3) baugleich sind.Circuit arrangement (1) according to claim 2, wherein the LEDs of all light strands (2, 3) are identical. Schaltungsanordnung (1) nach Anspruch 2 oder 3, wobei die Anzahl der in den Leuchtsträngen (2, 3) in Serie geschalteten LEDs voneinander abweicht.Circuit arrangement (1) according to claim 2 or 3, wherein the number of LEDs connected in series in the light strings (2, 3) differs from one another. Schaltungsanordnung (1) nach Anspruch 2, wobei die Anzahl der in den zumindest zwei Leuchtsträngen (2, 3) in Serie geschalteten LEDs gleich ist, wobei die Durchlassspannungen der LEDs der zwei Leuchtstränge (2, 3) voneinander abweichen.Circuit arrangement (1) according to claim 2, wherein the number of LEDs connected in series in the at least two light strands (2, 3) is the same, the forward voltages of the LEDs of the two light strands (2, 3) differing from one another. Schaltungsanordnung (1) nach einem der vorhergehenden Ansprüche, wobei die Energiequelle (5) eine Konstantstromquelle ist.Circuit arrangement (1) according to one of the preceding claims, wherein the energy source (5) is a constant current source. Schaltungsanordnung (1) nach einem der vorhergehenden Ansprüche, wobei das Schaltelement (6) ein Relais oder ein Transistor, insbesondere ein MOSFET- oder ein Bipolar-Transistor, ist.Circuit arrangement (1) according to one of the preceding claims, wherein the switching element (6) is a relay or a transistor, in particular a MOSFET or a bipolar transistor. Schaltungsanordnung (1) nach einem der vorhergehenden Ansprüche, wobei die Schaltspannung (6) des Schaltelements zwischen 5 V und 24V beträgt.Circuit arrangement (1) according to one of the preceding claims, wherein the switching voltage (6) of the switching element is between 5 V and 24V. Schaltungsanordnung (1) nach einem der vorhergehenden Ansprüche, wobei die durch die Energiequelle (5) zur Verfügung gestellte, an der Parallelschaltung (4) anliegende Spannung zwischen 2V und 60V beträgt.Circuit arrangement (1) according to one of the preceding claims, wherein the voltage provided by the energy source (5) and applied to the parallel circuit (4) is between 2V and 60V. Leuchtvorrichtung, umfassend zumindest eine Schaltungsanordnung (1) nach einem der vorhergehenden Ansprüche.Lighting device comprising at least one circuit arrangement (1) according to one of the preceding claims. Fahrzeugscheinwerfer, insbesondere Kraftfahrzeugscheinwerfer, umfassend eine Leuchtvorrichtung nach Anspruch 10.Vehicle headlight, in particular motor vehicle headlight, comprising a lighting device according to claim 10.
EP18155962.6A 2018-02-09 2018-02-09 Circuit arrangement for switching on and off at least two light strands for a vehicle headlight electrically connected in parallel Active EP3525552B1 (en)

Priority Applications (2)

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EP18155962.6A EP3525552B1 (en) 2018-02-09 2018-02-09 Circuit arrangement for switching on and off at least two light strands for a vehicle headlight electrically connected in parallel
CN201910103130.0A CN110139421A (en) 2018-02-09 2019-02-01 Alternating turns on and off the circuit device of at least two electrically in parallel lamp branches of headlight

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EP18155962.6A EP3525552B1 (en) 2018-02-09 2018-02-09 Circuit arrangement for switching on and off at least two light strands for a vehicle headlight electrically connected in parallel

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Citations (2)

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JP2014157744A (en) * 2013-02-15 2014-08-28 Panasonic Corp Light emitting circuit, light emitting module and lighting apparatus
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EP3193564A1 (en) * 2014-09-08 2017-07-19 Citizen Watch Co., Ltd. Led drive circuit
US20180014368A1 (en) * 2015-01-13 2018-01-11 Philips Lighting Holding B.V. Operation of led lighting elements under control with a light sensitive element

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