EP1244334A2 - Circuit for a LED light source - Google Patents

Circuit for a LED light source Download PDF

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Publication number
EP1244334A2
EP1244334A2 EP02005598A EP02005598A EP1244334A2 EP 1244334 A2 EP1244334 A2 EP 1244334A2 EP 02005598 A EP02005598 A EP 02005598A EP 02005598 A EP02005598 A EP 02005598A EP 1244334 A2 EP1244334 A2 EP 1244334A2
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EP
European Patent Office
Prior art keywords
coding
light source
circuit arrangement
arrangement according
led light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02005598A
Other languages
German (de)
French (fr)
Other versions
EP1244334A3 (en
Inventor
Robert Trinschek
Siegfried Schmees
Frank Klein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Goodrich Lighting Systems GmbH and Co KG
Original Assignee
Hella KGaA Huek and Co
Goodrich Hella Aerospace Lighting Systems GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hella KGaA Huek and Co, Goodrich Hella Aerospace Lighting Systems GmbH filed Critical Hella KGaA Huek and Co
Publication of EP1244334A2 publication Critical patent/EP1244334A2/en
Publication of EP1244334A3 publication Critical patent/EP1244334A3/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Withdrawn legal-status Critical Current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]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules

Definitions

  • the invention relates to a circuit arrangement consisting of a luminaire with two connecting cables (connecting contacts), their light source has at least one light emitting diode (LED).
  • the LED light source is supplied via the Connection lines from an adjustable, preferably adjustable current source.
  • a Such lamp in the form of a rear lamp for motor vehicles is for example from the EP 0 896 899 is known.
  • Luminaires with an LED light source have one Light source with incandescent lamps have the advantage of a longer life. Furthermore, they are less sensitive to vibrations than incandescent lamps, which are the result of Vibrations can lead to a filament break.
  • the supply current must be relatively accurate so-called nominal current can be set, otherwise the light color of the LED light source does not correspond to the desired color and if the nominal current is exceeded the The lifespan of the LED light source decreases.
  • LED light sources can vary in type LEDs used, in number and / or circuit arrangement (parallel / series connection; Distinguish matrix structure) of the LEDs.
  • the Number of LED current paths connected in parallel has a major influence on the nominal current the LED light source.
  • Another solution would be to provide a measuring resistor in the luminaire Resistance value as coding for the nominal current of the LED light source via a separate Connection cable - in addition to the actual connection cables for the Power supply of the lamp - would be queried, and then the Current source would be set to the nominal current.
  • this solution has the Disadvantage of the additional connection line, which may be complex to lay and must be connected.
  • the object of the invention is therefore to provide a circuit arrangement with the lights with LED light sources of different nominal currents in a simple and flexible way are operating.
  • This task is solved in that in the luminaire in the circuit parallel to the LED light source a coding element is arranged, the coding of the nominal current of the LED light source represents.
  • the coding is preferably carried out in one Control unit arranged control unit read out and evaluated. To this end the evaluation circuit is connected to at least one connection line of the lamp. The current source is then automatically (intelligently) opened on the basis of the coding determined in this way set the nominal current of the LED light source.
  • the control unit recognizes the circuit arrangement according to the invention itself, what nominal current the lamp requires. There is no separate connection line between the control unit and the lamp necessary because the same connection line is used to query the coding element, which is used for the power supply.
  • FIG. 1 shows a lamp (1) with an LED light source (2), the two Connection lines (14, 15) is connected to a control unit (5) in which a controllable Power source (8) is included.
  • the LED light source (2) is symbolic by a light emitting diode shown - in fact, the LED light source has a large number of LEDs, which in Form of several rows connected in parallel, being in each row again several LEDs are arranged.
  • the nominal current of such an LED light source now depends on the type of LEDs used and the number of rows connected in parallel. Depending on the desired light output, the LED light sources can therefore Nominal current vary.
  • a resistor (3) inside the lamp (1) arranged as a coding element for the nominal current, which is parallel to the LED light source (2) is switched.
  • the resistance value is a measure of the nominal current of the LED light source (2).
  • the controllable current source (8) in the control unit (2) is via a switching element (11) can be switched on or off.
  • the non-earthed connecting cable (15) is supplied with a measuring voltage (U M ) via a series resistor (9) arranged in the control unit (2), which is below the operating voltage (U B ) LED light source (2) lies. At this voltage, the LED light source is not conductive. The current that flows through the LED light source (2) is then negligibly small compared to the current through the coding resistor (3) (see FIG. 2).
  • the series resistor (9) and the coding resistor (3) then form a voltage divider, the voltage being tapped in the middle between the series resistor (9) and the coding resistor (3).
  • the coding resistor (3) - and thus ultimately the nominal current - is determined.
  • a table (13) is stored in the evaluation circuit (6), in which certain resistance values are assigned to certain nominal currents. In this case, a discretely distributed number of codes and nominal currents are used.
  • a formula can also be stored in the evaluation circuit (6), from which a nominal current is then calculated with the aid of the coding resistor. The nominal current determined in this way is then stored as a setpoint for the current source (8). Then the measuring circuit can be switched off, which of course takes place automatically.
  • the LED light source (2) is operated with the nominal current via the connection cable at operating voltage (U B ).
  • the internal resistance of the LED light source (2) compared to the coding resistor (3) is negligible (see Figure 2).
  • the current that flows through the coding resistor (3) is therefore very low.
  • the associated power loss is also very low.
  • Resistance coding can be used to encode a large number of current values (nominal currents). This number is only limited by the accuracy of the coding resistors, which is very high if the resistors are selected accordingly.
  • a pulse width modulated (PWM) operation of the LED light source (2) is also possible with this circuit arrangement.
  • the Coding resistance is read again each time the luminaire is switched on instead of after the activation of the control unit once and then each time it is switched on access the saved value.
  • the automatic shutdown of the Measuring voltage after the evaluation time can also be dispensed with, since the measuring current due to the resistance value of the series resistor compared to that of the Current source fed nominal current is many times smaller.
  • FIG. 1 A second embodiment of the invention is shown in FIG. At this Circuit arrangement, a diode (4) is connected in series with the coding resistor (3), this diode (4) opposite to the light-emitting diodes of the LED light source (2) is switched.
  • the polarity of the measurement voltage is reversed to the polarity of the Operating voltage. This ensures that no current flows through during the evaluation phase the LED light source flows, whereas no annoying power loss occurs during operation can arise at the coding resistor, since in this case no current flows at all can.
  • a measuring resistor 10 in the grounded branch of the one running in the control unit Connection cable for measuring the current through the LED light source and thus for Regulation of the current source to the nominal value serves as the setpoint.
  • Such one Measuring resistance is preferably also present in the other embodiments, however not shown there.
  • the coding element (3) is formed by a microcontroller or a logic module. After applying the measuring voltage (U M ), which is less than the operating voltage, the microcontroller is activated (similar to a reset). The microcontroller (3) then modulates the voltage or the current on the ungrounded connecting line (15) for the purpose of coding the nominal current.
  • the coding is preferably carried out using a bit sequence - similar to an answer-to-reset (ATR).
  • ATR answer-to-reset
  • the microcontroller (3) does not pull the voltage level below a threshold necessary for its operation. If the microcontroller (3) has an energy store, the voltage level can also be pulled to ground in the low phases.
  • the signal coded in this way is read out by the evaluation circuit (6). As soon as the operating voltage is applied, the microcontroller switches off. With this type of coding it is possible to code a very large number of nominal currents - finely graded.
  • the coding element (3) is formed by a capacitor, the charging and / or discharging time of which serves as coding.
  • the capacitor (3) can be briefly supplied with the measuring voltage (U M ), which is less than the operating voltage of the LED light source (2), via a switching element (not shown here) via the ungrounded connecting line (15).
  • control unit for the supply of two or more lights is formed.
  • the control unit points for each lamp an adjustable current source, one from the control unit to each lamp not grounded connecting cable is led to a lamp.
  • This control unit can have a separate evaluation circuit for the coding for each lamp or as a whole only one evaluation circuit, which then optionally (e.g. via a multiplexer) with the various non-earthed connecting leads leading to the lights can be connected.
  • the total operating time of the LED light source (2), e.g. via a counter, recorded, depending on the respective Total on-time of the nominal current is increased in order to maintain a constant brightness of the LED light source to achieve. This effectively reduces the problem of decreasing light intensity encountered the same nominal current with increasing operating time.
  • this is done Acquisition of the total switch-on time, preferably via the microcontroller.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

The circuit has a light (1) with 2 connection lines whose light source (2) has at least one LED, an adjustable current source for supplying the light via the connection lines, a coding element (3) parallel to the LED light source whose coding represents the rated current of the light source and an evaluation circuit (6) outside the light that evaluates the coding and sets the current source to the rated current of the LED light source accordingly.

Description

Die Erfindung bezieht sich auf eine Schaltungsanordnung bestehend aus einer Leuchte mit zwei Anschlussleitungen (Anschlusskontakten), deren Lichtquelle mindestens eine Leuchtdiode (LED) aufweist. Versorgt wird die LED-Lichtquelle über die Anschlussleitungen von einer einstellbaren, vorzugsweise regelbaren Stromquelle. Eine derartige Leuchte in Form einer Heckleuchte für Kraftfahrzeuge ist beispielsweise aus der EP 0 896 899 bekannt. Leuchten mit einer LED-Lichtquelle haben gegenüber einer Lichtquelle mit Glühlampen den Vorteil einer höheren Lebensdauer. Darüber hinaus sind sie gegenüber Erschütterungen unempfindlicher als Glühlampen, bei denen es in Folge von Erschütterungen zu einem Glühfadenbruch kommen kann.The invention relates to a circuit arrangement consisting of a luminaire with two connecting cables (connecting contacts), their light source has at least one light emitting diode (LED). The LED light source is supplied via the Connection lines from an adjustable, preferably adjustable current source. A Such lamp in the form of a rear lamp for motor vehicles is for example from the EP 0 896 899 is known. Luminaires with an LED light source have one Light source with incandescent lamps have the advantage of a longer life. Furthermore, they are less sensitive to vibrations than incandescent lamps, which are the result of Vibrations can lead to a filament break.

Allerdings muß bei LED-Lichtquellen der Versorgungsstrom relativ genau auf einen sogenannten Nennstrom eingestellt werden, da ansonsten die Lichtfarbe der LED-Lichtquelle nicht der gewünschten Farbe entspricht und bei einer Überschreitung des Nennstroms die Lebensdauer der LED-Lichtquelle sinkt.However, with LED light sources, the supply current must be relatively accurate so-called nominal current can be set, otherwise the light color of the LED light source does not correspond to the desired color and if the nominal current is exceeded the The lifespan of the LED light source decreases.

Nun ist der Nennstrom von Leuchten mit LED-Lichtquellen je nach Ausführung der LED-Lichtquelle sehr unterschiedlich. LED-Lichtquellen können sich hinsichtlich des Typs der verwendeten LEDs, in der Anzahl und/oder der Schaltungsanordnung (Parallel/Reihenschaltung; Matrixstruktur) der LEDs unterscheiden. Dabei hat insbesondere die Anzahl der parallel geschalteten LED-Strompfade einen großen Einfluß auf den Nennstrom der LED-Lichtquelle.Now the nominal current of luminaires with LED light sources is depending on the version of the LED light source very different. LED light sources can vary in type LEDs used, in number and / or circuit arrangement (parallel / series connection; Distinguish matrix structure) of the LEDs. In particular, the Number of LED current paths connected in parallel has a major influence on the nominal current the LED light source.

Beim Anschluß einer Leuchte mit einer LED-Lichtquelle an eine Stromquelle bzw. an ein Steuergerät, in dem die Stromquelle sich befindet, muß der Nennstrom der LED-Lichtquelle bekannt sein. Die Regelung der Stromquelle ist auf den bekannten Nennstrom als Sollwert eingestellt. Dies hat jedoch den Nachteil, dass ein Steuergerät immer genau zur Ansteuerung einer LED-Lichtquelle mit einem bestimmten Nennstrom ausgelegt ist. Steuergerät und Leuchte müssen als Paar immer genau zueinander passen. Die Verwendung eines Steuergeräts für LED-Lichtquellen mit unterschiedlichem Nennstrom ist damit nicht möglich. When connecting a luminaire with an LED light source to a power source or to a Control unit in which the power source is located must have the nominal current of the LED light source be known. The regulation of the current source is based on the known nominal current as the setpoint set. However, this has the disadvantage that a control unit is always used for control purposes an LED light source is designed with a certain nominal current. Control unit and Luminaires must always match each other exactly as a pair. The use of a control unit this is not possible for LED light sources with different nominal currents.

Ein Ausweg aus dieser Situation wäre die Verwendung eines Steuergerätes mit mehreren Stromausgängen für jeweils verschiede Nennströme. Allerdings ist ein derartiges Steuergerät sehr aufwendig. Darüber hinaus kann ein irrtümlich falsches Anschließen einer Leuchte an einen falschen Stromausgang nicht vollständig ausgeschlossen werden. Außerdem ist die Variationsvielfalt gering.One way out of this situation would be to use one control unit with several Current outputs for different nominal currents. However, such a control device very complex. In addition, an erroneously incorrect connection of a lamp an incorrect current output cannot be completely excluded. Besides, that is Low variety.

Eine andere Lösung wäre das Vorsehen eines Messwiderstandes in der Leuchte, deren Widerstandswert als Codierung für den Nennstrom der LED-Lichtquelle über eine separate Anschlussleitung - zusätzlich zu den eigentlichen Anschlussleitungen für die Stromversorgung der Leuchte - abgefragt werden würde, und anhand dessen dann die Stromquelle auf den Nennstrom eingestellt werden würde. Diese Lösung hat jedoch den Nachteil der zusätzlichen Anschlussleitung, die unter Umständen aufwendig verlegt und angeschlossen werden muß.Another solution would be to provide a measuring resistor in the luminaire Resistance value as coding for the nominal current of the LED light source via a separate Connection cable - in addition to the actual connection cables for the Power supply of the lamp - would be queried, and then the Current source would be set to the nominal current. However, this solution has the Disadvantage of the additional connection line, which may be complex to lay and must be connected.

Aufgabe der Erfindung ist es daher, eine Schaltungsanordnung zu schaffen, mit der Leuchten mit LED-Lichtquellen unterschiedlicher Nennströme in einfacher und flexibler Weise zu betreiben sind.The object of the invention is therefore to provide a circuit arrangement with the lights with LED light sources of different nominal currents in a simple and flexible way are operating.

Diese Aufgabe wird dadurch gelöst, dass in der Leuchte im Stromkreis parallel zur LED-Lichtquelle ein Codierelement angeordnet ist, dessen Codierung den Nennstrom der LED-Lichtquelle repräsentiert. Dabei wird die Codierung über eine vorzugsweise in einem Steuergerät angeordnete Auswerteschaltung ausgelesen und ausgewertet. Zu diesem Zweck ist die Auswerteschaltung mit mindestens einer Anschlussleitung der Leuchte verbunden. Anhand der so ermittelten Codierung wird dann die Stromquelle automatisch (intelligent) auf den Nennstrom der LED-Lichtquelle eingestellt. Das Steuergerät erkennt bei der erfindungsgemäßen Schaltungsanordnung selbst, welchen Nennstrom die Leuchte benötigt. Eine separate Anschlussleitung zwischen dem Steuergerät und der Leuchte ist nicht notwendig, da für die Abfrage des Codierelements dieselbe Anschlussleitung benutzt wird, die für die Stromversorgung benutzt wird.This task is solved in that in the luminaire in the circuit parallel to the LED light source a coding element is arranged, the coding of the nominal current of the LED light source represents. The coding is preferably carried out in one Control unit arranged control unit read out and evaluated. To this end the evaluation circuit is connected to at least one connection line of the lamp. The current source is then automatically (intelligently) opened on the basis of the coding determined in this way set the nominal current of the LED light source. The control unit recognizes the circuit arrangement according to the invention itself, what nominal current the lamp requires. There is no separate connection line between the control unit and the lamp necessary because the same connection line is used to query the coding element, which is used for the power supply.

Auf diese Weise wird in einfacher Weise eine hohe Flexibilität erreicht, da an ein Steuergerät Leuchten mit LED-Lichtquellen unterschiedlicher Nennströmen angeschlossen werden können, die dann automatisch mit dem jeweils richtigen Nennstrom betrieben werden. In this way, a high degree of flexibility is achieved in a simple manner, since there is a control unit Luminaires with LED light sources of different nominal currents can be connected can be operated automatically with the correct nominal current.

Anhand der beigefügten Zeichnungen soll die Erfindung nachfolgend näher erläutert werden. Es zeigt:

Figur 1
eine Schaltungsanordnung gemäß einer ersten Ausführungsform,
Figur 2
die Strom-/Spannungskennlinien von LED-Lichtquelle und Codierwiderstand,
Figur 3
ein Flussdiagramm zur Ablaufsteuerung,
Figur 4
eine Schaltungsanordnung gemäß einer zweiten Ausführungsform,
Figur 5
eine Schaltungsanordnung gemäß einer dritten Ausführungsform,
Figur 6
eine Schaltungsanordnung gemäß einer vierten Ausführungsform,
Figur 7
ein Codiersignal, das von einem Mikrokontroller als Codierelement erzeugt wird.
The invention will be explained in more detail below with the aid of the accompanying drawings. It shows:
Figure 1
a circuit arrangement according to a first embodiment,
Figure 2
the current / voltage characteristics of the LED light source and coding resistor,
Figure 3
a flowchart for sequence control,
Figure 4
a circuit arrangement according to a second embodiment,
Figure 5
a circuit arrangement according to a third embodiment,
Figure 6
a circuit arrangement according to a fourth embodiment,
Figure 7
a coding signal that is generated by a microcontroller as a coding element.

Figur 1 zeigt eine Leuchte (1) mit einer LED-Lichtquelle (2), die über zwei Anschlussleitungen (14,15) an ein Steuergerät (5) angeschlossen ist, in dem eine regelbare Stromquelle (8) enthalten ist. Die LED-Lichtquelle (2) ist symbolisch durch eine Leuchtdiode dargestellt - tatsächlich weist die LED-Lichtquelle jedoch eine Vielzahl von LEDs auf, die in Form von mehreren parallel geschalteten Reihen angeordnet sind, wobei in jeder Reihe wiederum mehrere LEDs angeordnet sind. Der Nennstrom einer solchen LED-Lichtquelle hängt nun vom Typ der verwendeten LEDs und der Zahl der parallel geschalteten Reihen ab. Je nach gewünschter Lichtleistung können die LED-Lichtquellen daher hinsichtlich des Nennstroms variieren. Innerhalb der Leuchte (1) ist nun erfindungsgemäß ein Widerstand (3) als Codierelement für den Nennstrom angeordnet, der parallel zur LED-Lichtquelle (2) geschaltet ist. Dabei ist der Widerstandswert ein Maß für den Nennstrom der LED-Lichtquelle (2). Die regelbare Stromquelle (8) im Steuergerät (2) ist über ein Schaltelement (11) zu- bzw. abschaltbar.Figure 1 shows a lamp (1) with an LED light source (2), the two Connection lines (14, 15) is connected to a control unit (5) in which a controllable Power source (8) is included. The LED light source (2) is symbolic by a light emitting diode shown - in fact, the LED light source has a large number of LEDs, which in Form of several rows connected in parallel, being in each row again several LEDs are arranged. The nominal current of such an LED light source now depends on the type of LEDs used and the number of rows connected in parallel. Depending on the desired light output, the LED light sources can therefore Nominal current vary. According to the invention, there is now a resistor (3) inside the lamp (1) arranged as a coding element for the nominal current, which is parallel to the LED light source (2) is switched. The resistance value is a measure of the nominal current of the LED light source (2). The controllable current source (8) in the control unit (2) is via a switching element (11) can be switched on or off.

Um den Nennstrom über den Codierwiderstand (3) zu ermitteln, wird die nicht geerdete Anschlussleitung (15) über einen im Steuergerät (2) angeordneten Vorwiderstand (9) mit einer Messspannung (UM) beaufschlagt, die unterhalb der Betriebsspannung (UB) der LED-Lichtquelle (2) liegt. Bei dieser Spannung ist die LED-Lichtquelle nicht leitend. Der Strom, der durch die LED-Lichtquelle (2) fließt, ist dann gegenüber dem Strom durch den Codierwiderstand (3) vernachlässigbar klein (siehe Figur 2). Der Vorwiderstand (9) und der Codierwiderstand (3) bilden dann einen Spannungsteiler, wobei die Spannung in der Mitte zwischen dem Vorwiderstand (9) und dem Codierwiderstand (3) abgegriffen wird. Anhand der abgegriffenen Spannung, die einem Analog-/Digitalwandler (7) zugeführt wird, der bekannten Messspannung (UM) und dem bekannten Vorwiderstand (9) wird dann der Codierwiderstand (3) - und damit letztlich der Nennstrom - ermittelt. Zu diesem Zweck ist in der Auswerteschaltung (6) eine Tabelle (13) gespeichert, in der bestimmte Widerstandswerte bestimmten Nennströmen zugeordnet sind. In diesem Fall bedient man sich einer diskret verteilten Anzahl von Codierungen und Nennströmen. Alternativ dazu kann in der Auswerteschaltung (6) auch eine Formel hinterlegt sein, aus der dann mit Hilfe des Codierwiderstandes ein Nennstrom berechnet wird. Der so ermittelte Nennstrom wird dann als Sollwert für die Stromquelle (8) gespeichert. Dann kann die Messschaltung ausgeschaltet werden, was selbstverständlich automatisch erfolgt. Beim Einschalten der Leuchte (1) wird nun der gespeicherte Sollwert für die Stromquelle (8) ausgelesen und schließlich das Schaltelement (11) zur Verbindung der Stromquelle (8), die auf den Nennstrom eingestellt ist, mit der Anschlussleitung (15) geschlossen. Nun wird die LED-Lichtquelle (2) über die auf Betriebsspannung (UB) liegende Anschlussleitung mit dem Nennstrom betrieben. In diesem Zustand ist der Innenwiderstand der LED-Lichtquelle (2) gegenüber dem Codierwiderstand (3) zu vernachlässigen (siehe Figur 2). Der Strom, der durch den Codierwiderstand (3) fließt, ist daher sehr gering. Die damit verbundene Verlustleistung ist ebenfalls sehr gering. Mit Hilfe der Widerstandscodierung kann eine hohe Zahl von Stromwerten (Nennströmen) codiert werden. Diese Zahl wird nur durch die Genauigkeit der Codierwiderstände begrenzt, die jedoch bei entsprechender Auswahl von Widerständen sehr hoch ist. Ein pulsweitenmodulierter (PWM) Betrieb der LED-Lichtquelle (2) ist mit dieser Schaltungsanordnung ebenfalls möglich.In order to determine the nominal current via the coding resistor (3), the non-earthed connecting cable (15) is supplied with a measuring voltage (U M ) via a series resistor (9) arranged in the control unit (2), which is below the operating voltage (U B ) LED light source (2) lies. At this voltage, the LED light source is not conductive. The current that flows through the LED light source (2) is then negligibly small compared to the current through the coding resistor (3) (see FIG. 2). The series resistor (9) and the coding resistor (3) then form a voltage divider, the voltage being tapped in the middle between the series resistor (9) and the coding resistor (3). On the basis of the tapped voltage, which is fed to an analog / digital converter (7), the known measuring voltage (U M ) and the known series resistor (9), the coding resistor (3) - and thus ultimately the nominal current - is determined. For this purpose, a table (13) is stored in the evaluation circuit (6), in which certain resistance values are assigned to certain nominal currents. In this case, a discretely distributed number of codes and nominal currents are used. As an alternative to this, a formula can also be stored in the evaluation circuit (6), from which a nominal current is then calculated with the aid of the coding resistor. The nominal current determined in this way is then stored as a setpoint for the current source (8). Then the measuring circuit can be switched off, which of course takes place automatically. When the lamp (1) is switched on, the stored setpoint for the current source (8) is read out and finally the switching element (11) for connecting the current source (8), which is set to the nominal current, is closed with the connecting line (15). Now the LED light source (2) is operated with the nominal current via the connection cable at operating voltage (U B ). In this state, the internal resistance of the LED light source (2) compared to the coding resistor (3) is negligible (see Figure 2). The current that flows through the coding resistor (3) is therefore very low. The associated power loss is also very low. Resistance coding can be used to encode a large number of current values (nominal currents). This number is only limited by the accuracy of the coding resistors, which is very high if the resistors are selected accordingly. A pulse width modulated (PWM) operation of the LED light source (2) is also possible with this circuit arrangement.

Der vorstehend beschriebene Ablauf von der Aktivierung des Steuergerätes, über die Ermittlung der Codierung bis zum Betrieb der Leuchte ist in Figur 3 anschaulich dargestellt.The procedure described above from the activation of the control unit, via the Determination of the coding up to the operation of the lamp is shown in Figure 3.

Abweichend von dem in Figur 3 dargestellten Ablauf kann es auch vorgesehen sein, dass der Codierwiderstand bei jedem Einschalten der Leuchte erneut ausgelesen wird anstatt ihn nach der Aktivierung des Steuergerätes einmal zu speichern und dann bei jedem Einschalten auf den gespeicherten Wert zurückzugreifen. Auf das automatische Abschalten der Messspannung nach der Auswertezeit kann ebenfalls verzichtet werden, da der Meßstrom aufgrund des Widerstandswertes des Vorwiderstandes im Vergleich zu dem von der Stromquelle eingespeisten Nennstrom um ein Vielfaches kleiner ist. Durch den Verzicht auf das automatische Abschalten des Messstroms, kann in vorteilhafter Weise ein Bauelement zum Ein- und Ausschalten der Meßspannung eingespart werden.In a departure from the sequence shown in FIG. 3, it can also be provided that the Coding resistance is read again each time the luminaire is switched on instead of after the activation of the control unit once and then each time it is switched on access the saved value. On the automatic shutdown of the Measuring voltage after the evaluation time can also be dispensed with, since the measuring current due to the resistance value of the series resistor compared to that of the Current source fed nominal current is many times smaller. By doing without the automatic switching off of the measuring current can advantageously be a component saved for switching the measuring voltage on and off.

In Figur 4 ist eine zweite Ausführungsform der Erfindung gezeigt. Bei dieser Schaltungsanordnung ist in Reihe zu dem Codierwiderstand (3) eine Diode (4) geschaltet, wobei diese Diode (4) entgegengesetzt zu den Leuchtdioden der LED-Lichtquelle (2) geschaltet ist. Dabei ist die Polarität der Messspannung umgekehrt zur Polarität der Betriebsspannung. Während der Auswertephase wird damit erreicht, dass kein Strom durch die LED-Lichtquelle fließt, wohingegen während des Betriebs keine störende Verlustleistung am Codierwiderstand entstehen kann, da in diesem Fall dort überhaupt kein Strom fließen kann. Als Vorwiderstand für den Spannungsteiler zur Messung des Codierwiderstandes dient in diesem Fall ein Messwiderstand (10) im geerdeten Zweig der im Steuergerät verlaufenden Anschlussleitung, der zur Messung des Stroms durch die LED-Lichtquelle und damit zur Regelung der Stromquelle auf den Nennwert als Sollwert dient. Ein derartiger Messwiderstand ist vorzugsweise auch in den anderen Ausführungsformen vorhanden, jedoch dort nicht eingezeichnet.A second embodiment of the invention is shown in FIG. At this Circuit arrangement, a diode (4) is connected in series with the coding resistor (3), this diode (4) opposite to the light-emitting diodes of the LED light source (2) is switched. The polarity of the measurement voltage is reversed to the polarity of the Operating voltage. This ensures that no current flows through during the evaluation phase the LED light source flows, whereas no annoying power loss occurs during operation can arise at the coding resistor, since in this case no current flows at all can. Serves as a series resistor for the voltage divider for measuring the coding resistance in this case a measuring resistor (10) in the grounded branch of the one running in the control unit Connection cable for measuring the current through the LED light source and thus for Regulation of the current source to the nominal value serves as the setpoint. Such one Measuring resistance is preferably also present in the other embodiments, however not shown there.

In Figur 5 ist eine dritte Ausführungsform dargestellt. In dieser Ausführungsform wird das Codierelement (3) von einem Mikrokontroller oder einem Logikbaustein gebildet. Nach dem Anlegen der Messspannung (UM), die kleiner als die Betriebsspannung ist, wird der Mikrokontroller aktiviert (ähnlich einem Reset). Daraufhin moduliert der Mikrokontroller (3) die Spannung oder den Strom auf der nicht geerdeten Anschlussleitung (15) zum Zwecke der Codierung des Nennstroms. Die Codierung erfolgt vorzugsweise durch eine Bitfolge - ähnlich einem Answer-To-Reset (ATR). Dabei zieht der Mikrokontroller (3) den Spannungspegel nicht unterhalb einer für seinen Betrieb notwendigen Schwelle. Falls der Mikrokontroller (3) einen Energiespeicher aufweist, kann der Spannungspegel in den Low-Phasen auch auf Masse gezogen werden. Das auf diese Weise codierte Signal wird von der Auswerteschaltung (6) ausgelesen. Sobald die Betriebsspannung angelegt wird, schaltet sich der Mikrokontroller ab. Mit dieser Art der Codierung ist es möglich, eine sehr große Zahl von Nennströmen - fein abgestuft - zu codieren. A third embodiment is shown in FIG. In this embodiment, the coding element (3) is formed by a microcontroller or a logic module. After applying the measuring voltage (U M ), which is less than the operating voltage, the microcontroller is activated (similar to a reset). The microcontroller (3) then modulates the voltage or the current on the ungrounded connecting line (15) for the purpose of coding the nominal current. The coding is preferably carried out using a bit sequence - similar to an answer-to-reset (ATR). The microcontroller (3) does not pull the voltage level below a threshold necessary for its operation. If the microcontroller (3) has an energy store, the voltage level can also be pulled to ground in the low phases. The signal coded in this way is read out by the evaluation circuit (6). As soon as the operating voltage is applied, the microcontroller switches off. With this type of coding it is possible to code a very large number of nominal currents - finely graded.

In Figur 6 ist eine vierte Ausführungsform dargestellt. In dieser Ausführungsform wird das Codierelement (3) von einem Kondensator gebildet, dessen Lade- und/oder Entladezeit als Codierung dient. Zu diesem Zweck kann der Kondensator (3) über die nicht geerdete Anschlussleitung (15) über ein Schaltelement (hier nicht dargestellt) kurzfristig mit der Messspannung (UM) beaufschlagt werden, die kleiner als die Betriebsspannung der LED-Lichtquelle (2) ist.A fourth embodiment is shown in FIG. In this embodiment, the coding element (3) is formed by a capacitor, the charging and / or discharging time of which serves as coding. For this purpose, the capacitor (3) can be briefly supplied with the measuring voltage (U M ), which is less than the operating voltage of the LED light source (2), via a switching element (not shown here) via the ungrounded connecting line (15).

Ein weiteres Maß an Flexibilität wird erreicht, indem das Steuergerät für die Versorgung von zwei oder mehreren Leuchten ausgebildet ist. Dabei weist das Steuergerät für jede Leuchte eine einstellbare Stromquelle auf, wobei von dem Steuergerät zu jeder Leuchte eine nicht geerdete Anschlussleitung jeweils zu einer Leuchte geführt ist. Dabei kann dieses Steuergerät für jede Leuchte eine eigene Auswerteschaltung für die Codierung aufweisen oder insgesamt nur eine Auswerteschaltung, die dann wahlweise (z.B. über einen Multiplexer) mit den verschiedenen zu den Leuchten führenden, nicht geerdeten Anschlußleitungen verbindbar ist.Another level of flexibility is achieved by the control unit for the supply of two or more lights is formed. The control unit points for each lamp an adjustable current source, one from the control unit to each lamp not grounded connecting cable is led to a lamp. This control unit can have a separate evaluation circuit for the coding for each lamp or as a whole only one evaluation circuit, which then optionally (e.g. via a multiplexer) with the various non-earthed connecting leads leading to the lights can be connected.

In einer vorteilhaften Weiterentwicklung der Erfindung wird die Gesamteinschaltdauer der LED-Lichtquelle (2), z.B. über einen Zähler, erfasst, wobei in Abhängigkeit der jeweiligen Gesamteinschaltzeit der Nennstrom erhöht wird, um eine gleichbleibende Helligkeit der LED-Lichtquelle zu erzielen. Damit wird wirksam dem Problem der abnehmenden Lichtstärke bei gleichem Nennstrom mit zunehmender Betriebsdauer begegnet.In an advantageous further development of the invention, the total operating time of the LED light source (2), e.g. via a counter, recorded, depending on the respective Total on-time of the nominal current is increased in order to maintain a constant brightness of the LED light source to achieve. This effectively reduces the problem of decreasing light intensity encountered the same nominal current with increasing operating time.

In der Ausführungsform, in der das Codierelement ein Mikrokontroller (3) ist, erfolgt die Erfassung der Gesamteinschaltzeit vorzugsweise über den Mikrokontroller.In the embodiment in which the coding element is a microcontroller (3), this is done Acquisition of the total switch-on time, preferably via the microcontroller.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

  • 1) Leuchte1) light
  • 2) LED-Lichtquelle2) LED light source
  • 3) Codierelement3) coding element
  • 4) Diode4) diode
  • 5) Steuergerät5) control unit
  • 6) Auswerteschaltung6) Evaluation circuit
  • 7) Analog-/Digitalwandler7) Analog / digital converter
  • 8) Stromquelle8) Power source
  • 9) Vorwiderstand9) series resistor
  • 10) Messwiderstand10) Measuring resistor
  • 11) Schaltelement zum Ein- und Abschalten der Betriebsspannung11) Switching element for switching the operating voltage on and off
  • 12) Schaltelement zum Ein- und Abschalten der Messspannung12) Switching element for switching the measuring voltage on and off
  • 13) Codierungstabelle13) Coding table
  • 14) Masseanschlussleitung14) Earth connection cable
  • 15) Nicht geerdete Anschlussleitung15) Unearthed connection cable
  • UM) MessspannungU M ) measuring voltage
  • UB) BetriebsspannungU B ) operating voltage

    • Claims (14)

    Schaltungsanordnung bestehend aus einer Leuchte (1) mit zwei Anschlussleitungen (Anschlusskontakten), dessen Lichtquelle (2) mindestens eine Leuchtdiode (LED) aufweist, einer einstellbare Stromquelle (8) zur Stromversorgung der Leuchte über die Anschlussleitungen (14,15), gekennzeichnet durch ein in der Leuchte (1) im Stromkreis parallel zur LED-Lichtquelle (2) angeordnetes Codierelement (3), dessen Codierung den Nennstrom der LED-Lichtquelle (2) repräsentiert, eine außerhalb der Leuchte (1) angeordnete Auswerteschaltung (6), die mit mindestens einer Anschlussleitung (14,15) der Leuchte (1) verbunden ist, wobei die Auswerteschaltung (6) die Codierung des Codierelements (3) auswertet und anhand der so ermittelten Codierung die regelbare Stromquelle (8) auf den Nennstrom der LED-Lichtquelle (2) eingestellt wird. Circuit arrangement consisting of a luminaire (1) with two connecting lines (connecting contacts), the light source (2) of which has at least one light-emitting diode (LED), an adjustable current source (8) for supplying power to the lamp via the connecting lines (14, 15), marked by a coding element (3) arranged in the lamp (1) in the circuit parallel to the LED light source (2), the coding of which represents the nominal current of the LED light source (2), an evaluation circuit (6) arranged outside the light (1), which is connected to at least one connecting line (14, 15) of the light (1), the evaluation circuit (6) evaluating the coding of the coding element (3) and using the value determined in this way Coding the adjustable current source (8) is set to the nominal current of the LED light source (2). Schaltungsanordnung nach Anspruch 1,
    dadurch gekennzeichnet, dass
    die einstellbare Stromquelle (8) und die Auswerteschaltung (6) in einem Steuergerät (5) integriert sind.    Circuit arrangement according to claim 1,
    characterized in that
    the adjustable current source (8) and the evaluation circuit (6) are integrated in a control unit (5).         Schaltungsanordnung nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass
    die Auswerteschaltung (6) zur Ermittlung der Codierung die nicht geerdete Anschlussleitung (15) kurzfristig während einer Auswertezeitdauer mit einer Meßspannung (UM) beaufschlagt wird, die kleiner ist als die Betriebsspannung (UB) der LED-Lichtquelle (1).    Circuit arrangement according to claim 1 or 2,
    characterized in that
    the evaluation circuit (6) for determining the coding, the non-grounded connecting line (15) is briefly subjected to a measurement voltage (U M ) during an evaluation period that is less than the operating voltage (U B ) of the LED light source (1).         Schaltungsanordnung nach Anspruch 3,
    dadurch gekennzeichnet, dass
    die Auswerteschaltung (6) die Umschaltung der nicht geerdeten Anschlussleitung (15) von Messspannung auf Betriebsspannung bewirkt.     Circuit arrangement according to claim 3,
    characterized in that
    the evaluation circuit (6) switches the ungrounded connecting line (15) from the measuring voltage to the operating voltage.         Schaltungsanordnung nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass
    das Codierelement (3) ein Widerstand ist, dessen Widerstandswert als Codierung für den Nennstrom dient.    Circuit arrangement according to claim 1 or 2,
    characterized in that
    the coding element (3) is a resistor, the resistance value of which serves as coding for the nominal current.         Schaltungsanordnung nach Anspruch 5,
    dadurch gekennzeichnet, dass
    in dem Strompfad des Codierwiderstandes (3) in Reihe zu dem Codierwiderstand (3) eine Diode (4) angeordnet ist, die den Stromfluss durch diesen Pfad bei Bestromung der LED-Lichtquelle (2) mit dem Nennstrom sperrt.    Circuit arrangement according to claim 5,
    characterized in that
    A diode (4) is arranged in the current path of the coding resistor (3) in series with the coding resistor (3) and blocks the flow of current through this path when the LED light source (2) is energized with the rated current.         Schaltungsanordnung nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass
    das Codierelement (3) ein Mikrokontroller oder ein Logikbaustein ist, der während einer Codierungsermittlungszeit die Spannung und/oder den Strom auf der nicht geerdeten Anschlussleitung (15) zu Codierzwecken moduliert.    Circuit arrangement according to claim 1 or 2,
    characterized in that
    the coding element (3) is a microcontroller or a logic module which modulates the voltage and / or the current on the ungrounded connecting line (15) for coding purposes during a coding determination time.         Schaltungsanordnung nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass
    das Codierelement (3) ein Kondensator ist, dessen Lade- und/oder Entladezeit als Codierung dient.    Circuit arrangement according to claim 1 or 2,
    characterized in that
    the coding element (3) is a capacitor, the charging and / or discharging time of which serves as coding.         Schaltungsanordnung nach einem der vorstehenden Ansprüche 2 bis 8,
    dadurch gekennzeichnet, dass
    das Steuergerät (5) für die Versorgung von zwei oder mehr Leuchten (1) ausgebildet ist, wobei das Steuergerät (5) für jede Leuchte eine einstellbare Stromquelle (8) aufweist und von dem Steuergerät (5) zu jeder Leuchte eine nicht geerdete Anschlussleitung (15) jeweils zu einer Leuchte (1) geführt ist.    Circuit arrangement according to one of the preceding claims 2 to 8,
    characterized in that
    The control device (5) is designed to supply two or more lights (1), the control device (5) having an adjustable current source (8) for each light and the control device (5) for each light having a non-earthed connecting line ( 15) is led to a lamp (1).         Schaltungsanordnung nach Anspruch 9,
    dadurch gekennzeichnet, dass
    das Steuergerät (5) für jede Leuchte (1) eine eigene Auswerteschaltung (6) aufweist.     Circuit arrangement according to claim 9,
    characterized in that
    the control device (5) has its own evaluation circuit (6) for each lamp (1).         Schaltungsanordnung nach Anspruch 9,
    dadurch gekennzeichnet, dass
    das Steuergerät (5) eine Auswerteschaltung (6) aufweist, die wahlweise mit den verschiedenen zu den Leuchten (1) führenden, nicht geerdeten Anschlussleitungen (15) verbindbar ist.    Circuit arrangement according to claim 9,
    characterized in that
    the control device (5) has an evaluation circuit (6) which can optionally be connected to the various non-earthed connecting lines (15) leading to the lights (1).         Schaltungsanordnung nach einem der vorstehenden Ansprüche,
    dadurch gekennzeichnet, dass
    die Codierung gespeichert wird.    Circuit arrangement according to one of the preceding claims,
    characterized in that
    the coding is saved.         Schaltungsanordnung nach einem der vorstehenden Ansprüche,
    dadurch gekennzeichnet, dass
    die Einschaltzeit der LED-Lichtquelle (2) insgesamt erfasst wird und in Abhängigkeit der Gesamteinschaltzeit der Nennstrom erhöht wird, um eine gleichbleibende Helligkeit der LED-Lichtquelle (2) zu erzielen.    Circuit arrangement according to one of the preceding claims,
    characterized in that
    the switch-on time of the LED light source (2) is recorded overall and the nominal current is increased depending on the total switch-on time in order to achieve a constant brightness of the LED light source (2).         Schaltungsanordnung nach Anspruch 7 und 13,
    dadurch gekennzeichnet, dass
    die Einschaltzeit über den Mikrokontroller (3) in der Leuchte ermittelt wird.    Circuit arrangement according to claim 7 and 13,
    characterized in that
    the switch-on time is determined via the microcontroller (3) in the lamp.
    EP02005598A 2001-03-22 2002-03-12 Circuit for a LED light source Withdrawn EP1244334A3 (en)

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    Application Number Priority Date Filing Date Title
    DE10114124A DE10114124A1 (en) 2001-03-22 2001-03-22 circuitry
    DE10114124 2001-03-22

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    EP1244334A3 EP1244334A3 (en) 2005-04-27

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    DE (1) DE10114124A1 (en)

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