EP2124507A2 - Signal issuer for an LED light signal - Google Patents

Signal issuer for an LED light signal Download PDF

Info

Publication number
EP2124507A2
EP2124507A2 EP09160459A EP09160459A EP2124507A2 EP 2124507 A2 EP2124507 A2 EP 2124507A2 EP 09160459 A EP09160459 A EP 09160459A EP 09160459 A EP09160459 A EP 09160459A EP 2124507 A2 EP2124507 A2 EP 2124507A2
Authority
EP
European Patent Office
Prior art keywords
operating voltage
signal
light signal
load
characteristic
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Withdrawn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
EP09160459A
Other languages
German (de)
French (fr)
Other versions
EP2124507A3 (en
Inventor
Eike Berg
Stefan Burgass
Rolf Eckl
Uwe Frost
Norbert PÖPPLOW
Michael Zabel
Dirk Zimmermann
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP2124507A2 publication Critical patent/EP2124507A2/en
Publication of EP2124507A3 publication Critical patent/EP2124507A3/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
    • B61L5/12—Visible signals
    • B61L5/18—Light signals; Mechanisms associated therewith, e.g. blinders
    • B61L5/1809—Daylight signals
    • B61L5/1881—Wiring diagrams for power supply, control or testing
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L2207/00—Features of light signals
    • B61L2207/02—Features of light signals using light-emitting diodes [LEDs]

Definitions

  • the invention relates to a signal generator for a LED light signal with a circuit part for adapting a signal generator current operating voltage characteristic of the LED light signal to a characteristic of a light bulb light signal, wherein a load in response to the operating voltage can be controlled.
  • LEDs Light signals or LEDs on the basis of LEDs - light emitting diodes - instead of incandescent lamps are increasingly being used in many areas, especially in signaling technology. LEDs are comparatively inexpensive, durable and bright. However, the use of LEDs is difficult where the incandescent lamps are to be replaced by LEDs without changes to an existing monitoring device. This is particularly true for light signal circuits of the railroad, in which the proper function is usually monitored by a safe signaling by means of a signal-wise control part. In order to continue to use this monitoring device without modification, the signal generator current operating voltage characteristic of the LED light signal must be approximately matched to that of the incandescent light signal. In order to achieve interface compatibility, therefore, the additional circuit part in the signal generator is required. This circuit part allows the characteristic adjustment by the difference between the power consumption of the illuminated LEDs and the replaced light bulb is compensated by a corresponding electrical power consumption.
  • a control voltage is derived.
  • a rectifier bridge GR is connected in parallel with a control circuit 1 for a load 2, consisting of transistors T1, T2 and load resistors RL1, RL2 and current diodes D1 and D2.
  • the control circuit 1 generates from the operating voltage a control voltage which sets the average current flow through the transistors T1 and T2.
  • the characteristic curve adaptation achievable in this way is relatively inaccurate.
  • the load current, which results mainly through the transistors T1 and T2 is not sinusoidal at sinusoidal operating voltage, whereby the desired purely resistive character of the light bulb to be simulated can not be replicated exactly.
  • a pulse width modulated electronic switch 3rd according to FIG. 2 to use.
  • the circuit comprises, in addition to a power supply 4, an operating voltage measurement 5, wherein a pulse width modulation - PWM - is generated from the operating voltage by means of an algorithm 6, which activates the electronic switch 3 for energizing a load resistor 7.
  • the invention has for its object to overcome these drawbacks and to provide a signal generator of the generic type, which allows a simple way a characteristic adjustment according to needs accuracy.
  • the object is achieved in that a resistor network with electronically switchable resistors is provided as the load.
  • electronically switchable resistors in contrast to the known transistor variant and its modifications by means of PWM or MOSFET, a purely ohmic load character is generated.
  • I U / R.
  • Signal distortions in the zero crossing of the load current or harmonics do not occur.
  • the control of the resistors by means of electronic switches made possible by operating voltage-dependent connection or disconnection of resistors in a simple manner, a realization of the desired load for the characteristic adjustment.
  • the electronic switches of the resistor network can be driven by a microcontroller, depending on the operating voltage.
  • a microcontroller depending on the operating voltage.
  • the resistor network may additionally be equipped according to claim 3 with at least one normally closed contact for simulating an inrush current of the incandescent light signal.
  • the normally closed contact is preferably in the ground state, i. H. with dark signal, closed. After switching on the operating voltage, the normally closed contact is opened after a specified time. This results shortly after switching on the operating voltage for a short time an additional surge, which simulates the surge, which arises at the incandescent light signal due to its lower resistance in the cold state. Since the inrush current in the incandescent light signal depends on the magnitude of the applied voltage and on the heating of the filament, which leads to an increase in the resistance, also on the time, the accuracy of the replica by the use of multiple break contacts, the be controlled according to these initial conditions can be improved.
  • FIG. 4 shows the essential components of a characteristic adaptation according to the invention.
  • transistors - FIG. 1 - or PWM - FIG. 2 - or MOSFET - FIG. 3 - A resistor network with resistors R1, R2, R3, which are controlled by electronic switches 13.1, 13.2, 13.3, used.
  • the desired load is realized by operating voltage-dependent connection or disconnection of the resistors R1, R2, R3.
  • the circuit arrangement of the resistors R1, R2, R3, which may also have different values, is freely configurable according to the respective requirements.
  • For controlling the electronic switches 13.1, 13.2, 13.3 is preferably a microcontroller 14 or a programmable logic.
  • FIG. 5 illustrates a signal generator power operating voltage diagram in which the characteristic 15 to be emulated of a light bulb, the characteristic 16 of an LED array and the characteristic curve 17 of a matching circuit according to the principle of FIG. 4 are shown. It can be seen that a very good characteristic curve adaptation already results with only five resistance levels.
  • the frequency of the characteristic 17 can be by the freely selectable number of resistors R1 to R7 used according to FIG. 6 within the scope of the monitoring-specific tolerances.
  • the LED characteristic 16 is split into a night area ⁇ 8 V and a day area> 8 V. Especially in the night area, there is a big difference between the power consumption of the incandescent lamp and the power consumption necessary for the illumination of the LEDs.
  • the signal generator generates in this critical area suitable for external monitoring output, which comes very close to the incandescent lamp.
  • the circuit can also be used to simulate the cold resistance of the signal lamp.
  • an opener contact 18 is provided which is closed when the signal is switched off. After switching on the operating voltage of the normally closed contact 18 is opened after a specified time. The resulting additional current flow shortly after switching on reflects the additional current flow, which arises in the case of an incandescent lamp due to its lower resistance in the cold state. Since the resistance of the filament increases as a function of the heating, the inrush current of the incandescent lamp depends on the level of the applied voltage and on the time. To replicate this relationship exactly, several separately controlled break contacts 18 can be used.
  • FIGS. 6a, 6b and 6c show resistor networks of various complexity which can be combined with the cold-thread simulation of FIG. 6d.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)

Abstract

The transmitter has a circuit part provided for adjusting a signal transmitter current-operating voltage-characteristic curve of a LED-light signal to a characteristics curve of a filament lamp-light signal. A load is controlled based on the operating voltage, where a resistor network with electronically switchable resistors (R1-R3) is provided as the load. Electronic switches (13.1-13.3) of the resistor network are controlled by a microcontroller (14) based on the operating voltage, and an opening-contact is provided for simulation of switching current surge of the lamp-light signal.

Description

Die Erfindung betrifft einen Signalgeber für ein LED-Lichtsignal mit einem Schaltungsteil zur Anpassung einer Signalgeberstrom-Betriebsspannungs-Kennlinie des LED-Lichtsignals an eine Kennlinie eines Glühlampen-Lichtsignals, wobei eine Last in Abhängigkeit von der Betriebsspannung ansteuerbar ist.The invention relates to a signal generator for a LED light signal with a circuit part for adapting a signal generator current operating voltage characteristic of the LED light signal to a characteristic of a light bulb light signal, wherein a load in response to the operating voltage can be controlled.

Lichtsignale oder Leuchtzeichen auf der Basis von LEDs - lichtemittierende Dioden - anstelle von Glühlampen werden in vielen Bereichen, insbesondere in der Signaltechnik zunehmend angewendet. LEDs sind vergleichsweise preiswert, langlebig und lichtstark. Schwierig ist der Einsatz von LEDs jedoch dort, wo ohne Änderungen einer vorhandenen Überwachungseinrichtung die Glühlampen durch LEDs ersetzt werden sollen. Besonders gilt dieses für Lichtsignalschaltungen der Eisenbahn, bei welchen die ordnungsgemäße Funktion in der Regel durch eine signaltechnisch sichere Strommessung mittels eines stellwerkseitigen Stellteiles überwacht wird. Um diese Überwachungseinrichtung ohne Änderung weiter verwenden zu können, muss die Signalgeberstrom-Betriebsspannungs-Kennlinie des LED-Lichtsignals annähernd an die des Glühlampen-Lichtsignals angepasst werden. Um Schnittstellenkompatibilität zu erreichen, ist daher der zusätzliche Schaltungsteil in dem Signalgeber erforderlich. Dieser Schaltungsteil ermöglicht die Kennlinienanpassung, indem die Differenz zwischen der Stromaufnahme der leuchtenden LEDs und der ersetzten Glühlampe durch eine entsprechende elektrische Leistungsaufnahme ausgeglichen wird.Light signals or LEDs on the basis of LEDs - light emitting diodes - instead of incandescent lamps are increasingly being used in many areas, especially in signaling technology. LEDs are comparatively inexpensive, durable and bright. However, the use of LEDs is difficult where the incandescent lamps are to be replaced by LEDs without changes to an existing monitoring device. This is particularly true for light signal circuits of the railroad, in which the proper function is usually monitored by a safe signaling by means of a signal-wise control part. In order to continue to use this monitoring device without modification, the signal generator current operating voltage characteristic of the LED light signal must be approximately matched to that of the incandescent light signal. In order to achieve interface compatibility, therefore, the additional circuit part in the signal generator is required. This circuit part allows the characteristic adjustment by the difference between the power consumption of the illuminated LEDs and the replaced light bulb is compensated by a corresponding electrical power consumption.

Eine weitere Besonderheit bei Eisenbahn-Lichtsignalen ist die Signalisierung außerhalb von Tunneln oder Umgebungsbedingungen mit annähernd konstanten Lichtverhältnissen. Hier ist schaltungstechnisch eine Absenkung der Lichtleistung, d. h. der Betriebsspannung, für den Nachtbetrieb gegenüber dem Tagbetrieb zu realisieren. Daraus ergibt sich die Notwendigkeit einer möglichst genauen Kennlinienanpassung nicht nur punktuell, sondern über weite Bereiche der Betriebsspannung.Another special feature of railway light signals is the signaling outside of tunnels or environmental conditions with almost constant light conditions. In terms of circuitry, this is a reduction in the light output, ie the operating voltage, for night operation compared to daytime operation. This results in the need for the most accurate adjustment of the characteristic not only punctually, but over wide ranges of the operating voltage.

Aus der EP 1 232 654 A1 ist eine adaptive Kennlinienanpassung für LED-Signalgeber bekannt, bei der gemäß Figur 1 aus der Betriebsspannung eine Steuerspannung abgeleitet wird. Bei dieser für Wechselspannungsbetrieb konzipierten Schaltung ist eine Gleichrichterbrücke GR parallel mit einer Steuerschaltung 1 für eine Last 2, bestehend aus Transistoren T1, T2 sowie Lastwiderständen RL1, RL2 und Stromrichtungsdioden D1 und D2, verbunden. Die Steuerschaltung 1 erzeugt aus der Betriebsspannung eine Steuerspannung, welche den mittleren Stromfluss durch die Transistoren T1 und T2 einstellt. Die auf diese Weise erreichbare Kennlinienanpassung ist relativ ungenau. Der Laststrom, der sich hauptsächlich durch die Transistoren T1 und T2 ergibt, ist bei sinusförmiger Betriebsspannung nicht sinusförmig, wodurch der gewünschte rein ohmsche Charakter der zu simulierenden Glühlampe nicht exakt nachgebildet werden kann. Erschwerend kommt hinzu, dass der Wert des nicht sinusförmigen Laststromes von dem Messverfahren in der glühlampenspezifischen Überwachungseinrichtung des stellwerkseitigen Stellteiles abhängig ist. In der Praxis werden durchaus unterschiedliche Strommessverfahren eingesetzt, so dass erhebliche Mess- und Interpretationsunsicherheiten resultieren. Infolgedessen ist die Auslegung und Verifizierung dieser bekannten Schaltungsanordnung zur Kennlinienanpassung problematisch.From the EP 1 232 654 A1 is an adaptive characteristic adaptation for LED signal generator, in accordance with FIG. 1 from the operating voltage, a control voltage is derived. In this designed for AC operation circuit, a rectifier bridge GR is connected in parallel with a control circuit 1 for a load 2, consisting of transistors T1, T2 and load resistors RL1, RL2 and current diodes D1 and D2. The control circuit 1 generates from the operating voltage a control voltage which sets the average current flow through the transistors T1 and T2. The characteristic curve adaptation achievable in this way is relatively inaccurate. The load current, which results mainly through the transistors T1 and T2 is not sinusoidal at sinusoidal operating voltage, whereby the desired purely resistive character of the light bulb to be simulated can not be replicated exactly. To make matters worse, that the value of the non-sinusoidal load current is dependent on the measurement method in the light-bulb-specific monitoring device of the control unit-side actuating part. In practice, quite different current measurement methods are used, resulting in considerable measurement and interpretation uncertainties. As a result, the design and verification of this known circuit arrangement for characteristic adaptation is problematic.

Denkbar ist auch, anstelle der Transistorkombination gemäß Figur 1 einen pulsweitenmodulierten elektronischen Schalter 3 gemäß Figur 2 zu verwenden. Die Schaltung umfasst neben einer Spannungsversorgung 4 eine Betriebsspannungsmessung 5, wobei aus der Betriebsspannung mittels eines Algorithmus 6 eine Pulsweitenmodulation - PWM - erzeugt wird, welche den elektronischen Schalter 3 zur Bestromung eines Lastwiderstandes 7 ansteuert. Mit einer sinusförmigen Variation des Puls/Pausenverhältnisses der PWM über die Sinushalbwellen kann auch ein annähernd ohmscher Strom/Spannungsverlauf simuliert werden. Nachteilig ist jedoch, dass durch die steilen Schaltflanken der PWM hochfrequente Störungen auf der Versorgungsleitung entstehen, welche Probleme hinsichtlich der elektromagnetischen Verträglichkeit - EMV - erzeugen, die wiederum nur durch aufwändige Netzfilter 8 beherrschbar sind. Die Gesamtschaltung ist infolgedessen hinsichtlich Auslegung und Realisierung sehr komplex.It is also conceivable, instead of the transistor combination according to FIG. 1 a pulse width modulated electronic switch 3rd according to FIG. 2 to use. The circuit comprises, in addition to a power supply 4, an operating voltage measurement 5, wherein a pulse width modulation - PWM - is generated from the operating voltage by means of an algorithm 6, which activates the electronic switch 3 for energizing a load resistor 7. With a sinusoidal variation of the pulse / pause ratio of the PWM over the half sine waves, an approximately resistive current / voltage curve can also be simulated. The disadvantage, however, is that due to the steep switching edges of the PWM high-frequency interference on the supply line, which problems with respect to the electromagnetic compatibility - EMC - produce, which in turn can only be controlled by consuming network filter 8. As a result, the overall circuit is very complex in terms of design and implementation.

Bei einer weiteren Abwandlung des aus der oben genannten EP 1 233 654 B1 bekannten und in Figur 1 dargestellten Grundprinzips dient als elektronisch steuerbare Last gemäß Figur 3 die D-S-Strecke eines Leistungs-MOSFETs 9. Der D-S-Widerstand, der die gewünschte Verlustleistung 10 zur Kennlinienanpassung bewirken soll, ist von der G-S-Spannung, aber auch von der D-S-Spannung abhängig. Dadurch entsteht ein nichtlinearer, nicht rein ohmscher Zusammenhang, der schaltungstechnisch aufwändig kompensiert werden muss. Darüber hinaus ist der D-S-Widerstand auch stark von der Temperatur und vom Exemplar des Leistungs-MOSFETs 9 abhängig. Das erhöht wiederum die Komplexität einer MOSFET- Ansteuerschaltung 11, um eine rein ohmsche Last vorzutäuschen. Über eine Rückkopplung 12 muss der gewünschte Strom überwacht werden, um die Gate-Spannung laufend nachführen zu können. Letztlich erfordert die MOSFET-Variante für den Einsatz zur Kennlinienanpassung, insbesondere bei Wechselspannung, einen unpraktikabel großen schaltungstechnischen Aufwand.In a further modification of the above EP 1 233 654 B1 known and in FIG. 1 illustrated basic principle serves as an electronically controllable load according to FIG. 3 the DS path of a power MOSFET 9. The DS resistor, which is intended to produce the desired power loss 10 for characteristic adjustment, depends on the DC voltage, but also on the DS voltage. This results in a non-linear, not purely ohmic relationship, which must be complexly compensated circuitry. In addition, the DS resistance is also highly dependent on the temperature and the specimen of the power MOSFET 9. This in turn increases the complexity of a MOSFET drive circuit 11 to simulate a purely resistive load. Via a feedback 12, the desired current must be monitored in order to track the gate voltage continuously. Ultimately, the MOSFET variant for use for characteristic adaptation, in particular for AC voltage, requires an impractical large-scale circuit complexity.

Der Erfindung liegt die Aufgabe zugrunde, diese Nachteile zu beseitigen und einen Signalgeber der gattungsgemäßen Art anzugeben, der auf einfache Weise eine Kennlinienanpassung bedarfsgemäßer Genauigkeit ermöglicht.The invention has for its object to overcome these drawbacks and to provide a signal generator of the generic type, which allows a simple way a characteristic adjustment according to needs accuracy.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, dass als Last ein Widerstandsnetzwerk mit elektronisch schaltbaren Widerständen vorgesehen ist. Durch die Verwendung elektronisch schaltbarer Widerstände wird im Gegensatz zu der bekannten Transistorvariante und deren Abwandlungen mittels PWM oder MOSFET ein rein ohmscher Lastcharakter erzeugt. Für Widerstände besteht ein streng linearer Zusammenhang zwischen Strom und Spannung gemäß dem ohmschen Gesetzt I = U/R. Signalverzerrungen im Nulldurchgang des Laststromes oder Oberwellen treten nicht auf. Die Ansteuerung der Widerstände mittels elektronischer Schalter ermöglicht durch betriebsspannungsabhängiges Zu- oder Abschalten von Widerständen auf einfache Weise eine Realisierung der gewünschten Last zur Kennlinienanpassung.According to the invention the object is achieved in that a resistor network with electronically switchable resistors is provided as the load. By using electronically switchable resistors, in contrast to the known transistor variant and its modifications by means of PWM or MOSFET, a purely ohmic load character is generated. For resistors, there is a strictly linear relationship between current and voltage according to ohmic law I = U / R. Signal distortions in the zero crossing of the load current or harmonics do not occur. The control of the resistors by means of electronic switches made possible by operating voltage-dependent connection or disconnection of resistors in a simple manner, a realization of the desired load for the characteristic adjustment.

Eine kontinuierliche Einstellung des gewünschten Lastwiderstandes ist bei Widerstandsnetzwerken zwar nicht möglich, aber auch nicht unbedingt notwendig. Innerhalb akzeptabler Toleranzgrenzen genügen wenige geschaltete Widerstände, so dass letztlich eine aufwandsgünstige Realisierung möglich ist. Vorteilhaft ist weiterhin das zu erwartende langzeitstabile Verhalten auch bei erheblichen Temperaturschwankungen.Although continuous adjustment of the desired load resistance is not possible with resistor networks, it is also not absolutely necessary. Within acceptable tolerance limits meet only a few switched resistors, so that ultimately a cost-effective implementation is possible. Another advantage is the expected long-term stable behavior even with significant temperature fluctuations.

Gemäß Anspruch 2 ist vorgesehen, dass die elektronischen Schalter des Widerstandsnetzwerkes betriebsspannungsabhängig mittels eines Mikrocontrollers ansteuerbar sind. Damit ist es leicht möglich, je nach gemessener Betriebsspannung ein bestimmtes Bitmuster für die Ansteuerung der elektronischen Schalter zu erzeugen.According to claim 2, it is provided that the electronic switches of the resistor network can be driven by a microcontroller, depending on the operating voltage. Thus, it is easily possible, depending on the measured operating voltage a specific To generate bit pattern for the control of the electronic switch.

Das Widerstandsnetzwerk kann gemäß Anspruch 3 zusätzlich mit mindestens einem Öffner-Kontakt zur Nachbildung eines Einschaltstromstoßes des Glühlampen-Lichtsignals ausgestattet sein. Der Öffner-Kontakt ist vorzugsweise im Grundzustand, d. h. bei dunklem Signal, geschlossen. Nach Zuschalten der Betriebsspannung wird der Öffner-Kontakt nach einer festgelegten Zeit geöffnet. Dadurch ergibt sich kurz nach dem Zuschalten der Betriebsspannung kurzzeitig ein zusätzlicher Stromstoß, der den Stromstoß nachbildet, welcher bei dem Glühlampen-Lichtsignal aufgrund dessen geringeren Widerstandes im Kaltzustand entsteht. Da der Einschaltstromstoß bei dem Glühlampen-Lichtsignal von der Höhe der anliegenden Spannung und aufgrund der Erwärmung des Glühfadens, der zu einer Erhöhung des Widerstandes führt, auch von der Zeit abhängig ist, kann die Genauigkeit der Nachbildung durch die Verwendung mehrerer Öffner-Kontakte, die entsprechend dieser Anfangsbedingungen angesteuert werden, verbessert werden.The resistor network may additionally be equipped according to claim 3 with at least one normally closed contact for simulating an inrush current of the incandescent light signal. The normally closed contact is preferably in the ground state, i. H. with dark signal, closed. After switching on the operating voltage, the normally closed contact is opened after a specified time. This results shortly after switching on the operating voltage for a short time an additional surge, which simulates the surge, which arises at the incandescent light signal due to its lower resistance in the cold state. Since the inrush current in the incandescent light signal depends on the magnitude of the applied voltage and on the heating of the filament, which leads to an increase in the resistance, also on the time, the accuracy of the replica by the use of multiple break contacts, the be controlled according to these initial conditions can be improved.

Nachfolgend wird die Erfindung anhand figürlicher Darstellungen näher erläutert. Es zeigen:

Figur 1
eine bekannte Schaltungsanordnung zur Anpassung einer Signalgeberstrom-Betriebsspannungs-Kennlinie eines LED-Lichtsignals,
Figur 2
eine erste Abwandlung der Kennlinienanpassung gemäß Figur 1 in schematisierter Darstellung,
Figur 3
eine zweite Abwandlung der Kennlinienanpassung gemäß Figur 1 in schematisierter Darstellung,
Figur 4
eine erfindungsgemäße Kennlinienanpassung in der Darstellungsweise der Figuren 2 und 3,
Figur 5
ein Signalgeberstrom-Betriebsspannungs-Diagramm und
Figur 6
vier Varianten eines Widerstandsnetzwerkes.
The invention will be explained in more detail with reference to figurative representations. Show it:
FIG. 1
a known circuit arrangement for adapting a signal generator current operating voltage characteristic of an LED light signal,
FIG. 2
a first modification of the characteristic adaptation according to FIG. 1 in a schematic representation,
FIG. 3
a second modification of the characteristic adaptation according to FIG. 1 in a schematic representation,
FIG. 4
a characteristic adaptation according to the invention in the representation of the Figures 2 and 3 .
FIG. 5
a buzzer current operating voltage diagram and
FIG. 6
four variants of a resistor network.

Die oben erläuterte bekannte Kennlinienanpassung gemäß Figur 1 und deren in den Figuren 2 und 3 veranschaulichte Abwandlungen weisen vor allem den Nachteil auf, dass ein rein ohmscher Lastcharakter nicht oder nur mit ganz erheblichem schaltungstechnischen Aufwand erreichbar ist.The above-explained known characteristic adaptation according to FIG. 1 and their in the Figures 2 and 3 illustrated modifications have the particular disadvantage that a purely resistive load character is not or only with very considerable circuit complexity can be achieved.

Figur 4 zeigt die wesentlichen Komponenten einer erfindungsgemäßen Kennlinienanpassung. Anstelle von Transistoren - Figur 1 - oder PWM - Figur 2 - oder MOSFET - Figur 3 - wird ein Widerstandsnetzwerk mit Widerständen R1, R2, R3, die von elektronischen Schaltern 13.1, 13.2, 13.3 ansteuerbar sind, verwendet. Die gewünschte Last wird dabei durch betriebsspannungsabhängiges Zu- oder Abschalten der Widerstände R1, R2, R3 realisiert. Die schaltungstechnische Anordnung der Widerstände R1, R2, R3, welche auch unterschiedliche Werte besitzen können, ist entsprechend den jeweiligen Anforderungen frei konfigurierbar. Zur Ansteuerung der elektronischen Schalter 13.1, 13.2, 13.3 dient vorzugsweise ein Mikrocontroller 14 oder eine programmierbare Logik. FIG. 4 shows the essential components of a characteristic adaptation according to the invention. Instead of transistors - FIG. 1 - or PWM - FIG. 2 - or MOSFET - FIG. 3 - A resistor network with resistors R1, R2, R3, which are controlled by electronic switches 13.1, 13.2, 13.3, used. The desired load is realized by operating voltage-dependent connection or disconnection of the resistors R1, R2, R3. The circuit arrangement of the resistors R1, R2, R3, which may also have different values, is freely configurable according to the respective requirements. For controlling the electronic switches 13.1, 13.2, 13.3 is preferably a microcontroller 14 or a programmable logic.

Figur 5 veranschaulicht ein Signalgeberstrom-Betriebsspannungs-Diagramm, in dem die nachzubildende Kennlinie 15 einer Glühlampe, die Kennlinie 16 einer LED-Anordnung und die Kennlinie 17 einer Anpassungsschaltung nach dem Prinzip der Figur 4 dargestellt sind. Es ist ersichtlich, dass sich bereits bei lediglich fünf Widerstandsstufen eine sehr gute Kennlinienanpassung ergibt. Die Stufigkeit der Kennlinie 17 lässt sich durch die frei wählbare Anzahl der verwendeten Widerstände R1 bis R7 gemäß Figur 6 im Rahmen der überwachungsspezifischen Toleranzen halten. FIG. 5 illustrates a signal generator power operating voltage diagram in which the characteristic 15 to be emulated of a light bulb, the characteristic 16 of an LED array and the characteristic curve 17 of a matching circuit according to the principle of FIG. 4 are shown. It can be seen that a very good characteristic curve adaptation already results with only five resistance levels. The frequency of the characteristic 17 can be by the freely selectable number of resistors R1 to R7 used according to FIG. 6 within the scope of the monitoring-specific tolerances.

Die LED-Kennlinie 16 ist in einen Nachtbereich < 8 V und einen Tagbereich > 8 V zweigeteilt. Insbesondere im Nachtbereich besteht ein großer Unterschied zwischen der Stromaufnahme der Glühlampe und der für das Leuchten der LEDs nötigen Stromaufnahme. Durch die beanspruchte Schaltung erzeugt der Signalgeber auch in diesem kritischen Bereich ein für die externe Überwachung geeignetes Ausgangssignal, das dem der Glühlampe sehr nahe kommt.The LED characteristic 16 is split into a night area <8 V and a day area> 8 V. Especially in the night area, there is a big difference between the power consumption of the incandescent lamp and the power consumption necessary for the illumination of the LEDs. By the claimed circuit, the signal generator generates in this critical area suitable for external monitoring output, which comes very close to the incandescent lamp.

Die Schaltung kann zusätzlich dafür genutzt werden, den Kaltwiderstand der Signallampe nachzubilden. Dazu ist gemäß Figur 6d ein Öffner-Kontakt 18 vorgesehen, der bei ausgeschaltetem Signal geschlossen ist. Nach Zuschalten der Betriebsspannung wird der Öffner-Kontakt 18 nach einer festgelegten Zeit geöffnet. Der sich ergebende zusätzliche Stromfluss kurz nach dem Einschalten bildet den zusätzlichen Stromfluss nach, welcher bei einer Glühlampe aufgrund deren geringeren Widerstandes im Kaltzustand entsteht. Da der Widerstand des Glühfadens in Abhängigkeit von der Erwärmung zunimmt, ist der Einschaltstromstoß der Glühlampe von der Höhe der anliegenden Spannung und von der Zeit abhängig. Um diesen Zusammenhang exakt nachzubilden, können auch mehrere separat angesteuerte Öffner-Kontakte 18 verwendet werden.The circuit can also be used to simulate the cold resistance of the signal lamp. For this purpose, according to FIG. 6 d, an opener contact 18 is provided which is closed when the signal is switched off. After switching on the operating voltage of the normally closed contact 18 is opened after a specified time. The resulting additional current flow shortly after switching on reflects the additional current flow, which arises in the case of an incandescent lamp due to its lower resistance in the cold state. Since the resistance of the filament increases as a function of the heating, the inrush current of the incandescent lamp depends on the level of the applied voltage and on the time. To replicate this relationship exactly, several separately controlled break contacts 18 can be used.

Die Figuren 6a, 6b und 6c zeigen Widerstandsnetzwerke verschiedener Komplexität, welche mit der Kaltfadennachbildung gemäß Figur 6d kombiniert werden können.FIGS. 6a, 6b and 6c show resistor networks of various complexity which can be combined with the cold-thread simulation of FIG. 6d.

Claims (3)

Signalgeber für ein LED-Lichtsignal mit einem Schaltungsteil zur Anpassung einer Signalgeberstrom-Betriebsspannungs-Kennlinie (16) des LED-Lichtsignals an eine Kennlinie (15) eines Glühlampen-Lichtsignals, wobei eine Last in Abhängigkeit von der Betriebsspannung ansteuerbar ist,
dadurch gekennzeichnet, dass
als Last ein Widerstandsnetzwerk mit elektronisch schaltbaren Widerständen (R1 bis R7) vorgesehen ist.Signal generator for a LED light signal with a circuit part for adapting a signal generator current operating voltage characteristic (16) of the LED light signal to a characteristic curve (15) of a light bulb light signal, wherein a load can be controlled as a function of the operating voltage,
characterized in that
as a load a resistor network with electronically switchable resistors (R1 to R7) is provided. Signalgeber nach Anspruch 1,
dadurch gekennzeichnet, dass
die elektronischen Schalter (13.1 bis 13.6) des Widerstandsnetzwerkes betriebsspannungsabhängig mittels eines Mikrocontrollers (14) ansteuerbar sind.Signaling device according to claim 1,
characterized in that
the electronic switches (13.1 to 13.6) of the resistor network operating voltage-dependent by means of a microcontroller (14) are controlled. Signalgeber nach einem der vorangehenden Ansprüche,
dadurch gekennzeichnet, dass
mindestens ein Öffner-Kontakt (18) zur Nachbildung eines Einschaltstromstoßes des Glühlampen-Lichtsignals vorgesehen ist.Signaling device according to one of the preceding claims,
characterized in that
at least one normally closed contact (18) is provided for simulating an inrush current of the incandescent light signal.
EP09160459.5A 2008-05-23 2009-05-18 Signal issuer for an LED light signal Withdrawn EP2124507A3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008025187A DE102008025187A1 (en) 2008-05-23 2008-05-23 Signal transmitter for a LED light signal

Publications (2)

Publication Number Publication Date
EP2124507A2 true EP2124507A2 (en) 2009-11-25
EP2124507A3 EP2124507A3 (en) 2014-05-28

Family

ID=41011796

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09160459.5A Withdrawn EP2124507A3 (en) 2008-05-23 2009-05-18 Signal issuer for an LED light signal

Country Status (2)

Country Link
EP (1) EP2124507A3 (en)
DE (1) DE102008025187A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2653365A1 (en) * 2012-04-18 2013-10-23 Siemens Schweiz AG Light signal containing an LED light source assembly for replacing a bulb assembly
WO2014019924A2 (en) * 2012-08-03 2014-02-06 Siemens Aktiengesellschaft Light signal
EP2687418A3 (en) * 2012-07-20 2014-05-14 Pintsch Bamag Antriebs- und Verkehrstechnik GmbH LED track signal for rail transport and interface for such an LED track signal
EP3037713A1 (en) * 2014-12-23 2016-06-29 DB Netz AG Lighting device for a light signal system for rail traffic
DE202016003785U1 (en) 2016-06-16 2016-07-20 Deutsche Bahn Ag Device for replacing a light bulb
DE102016007366A1 (en) 2016-06-16 2017-12-21 Deutsche Bahn Ag incandescent emulation
CN109884555A (en) * 2017-12-06 2019-06-14 台达电子企业管理（上海）有限公司 A kind of measurement method of direct current centralized lighting system and its lamps and lanterns state

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1232654A1 (en) 1999-11-25 2002-08-21 Quante Ag System-side connecting module and distributor for telecommunications technology
EP1233654A1 (en) 2001-01-19 2002-08-21 Siemens Aktiengesellschaft Circuit and method for adapting the characteristic curve of an LED

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19846753A1 (en) * 1998-10-07 2000-04-13 Siemens Ag Circuit arrangement for operating a light sign
US6764347B1 (en) * 2003-01-06 2004-07-20 Paul J. Plishner Plug and socket holder for replaceably holding diode-based light sources and other radiation sources and receivers
DE102004027351B3 (en) * 2004-06-01 2006-01-19 Siemens Ag Circuit arrangement for operating an LED signal generator
DE602005004167T2 (en) * 2005-11-18 2008-12-24 Thales Rail Signalling Solutions Gmbh Electrical circuit for LED signal lamps with a switching threshold for switching between daytime and nighttime operation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1232654A1 (en) 1999-11-25 2002-08-21 Quante Ag System-side connecting module and distributor for telecommunications technology
EP1233654A1 (en) 2001-01-19 2002-08-21 Siemens Aktiengesellschaft Circuit and method for adapting the characteristic curve of an LED

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2653365A1 (en) * 2012-04-18 2013-10-23 Siemens Schweiz AG Light signal containing an LED light source assembly for replacing a bulb assembly
EP2687418A3 (en) * 2012-07-20 2014-05-14 Pintsch Bamag Antriebs- und Verkehrstechnik GmbH LED track signal for rail transport and interface for such an LED track signal
WO2014019924A2 (en) * 2012-08-03 2014-02-06 Siemens Aktiengesellschaft Light signal
WO2014019924A3 (en) * 2012-08-03 2014-05-01 Siemens Aktiengesellschaft Light signal
EP3037713A1 (en) * 2014-12-23 2016-06-29 DB Netz AG Lighting device for a light signal system for rail traffic
DE202016003785U1 (en) 2016-06-16 2016-07-20 Deutsche Bahn Ag Device for replacing a light bulb
DE102016007366A1 (en) 2016-06-16 2017-12-21 Deutsche Bahn Ag incandescent emulation
DE102016007366B4 (en) * 2016-06-16 2021-05-06 Deutsche Bahn Aktiengesellschaft Incandescent emulation
CN109884555A (en) * 2017-12-06 2019-06-14 台达电子企业管理（上海）有限公司 A kind of measurement method of direct current centralized lighting system and its lamps and lanterns state

Also Published As

Publication number Publication date
DE102008025187A1 (en) 2009-12-03
EP2124507A3 (en) 2014-05-28

Similar Documents

Publication Publication Date Title
EP2124507A2 (en) Signal issuer for an LED light signal
EP1360088B1 (en) Lighting system for motor vehicles
DE102012101363A1 (en) Method for operating a circuit arrangement with a control and / or regulating means for a light-emitting diode array
DE102008047731A1 (en) Lighting device i.e. headlight, failure detecting method for motor vehicle, involves detecting failure of LEDs by determining or evaluating voltage drop of LEDs, where evaluation takes place by comparing voltage drop with reference value
DE102006022158A1 (en) Power circuit with short-circuit protection circuit
DE102013113053A1 (en) Driver circuit with a semiconductor light source and method for operating a driver circuit
DE10102352C2 (en) Circuit arrangement for adapting the characteristics of a light-emitting diode arrangement, light-emitting diode signal lamp and light signal arrangement and their use
DE102006018308A1 (en) Circuit arrangement for automotive vehicle electrical system, has controller e.g. flasher, that generates testing voltage and current for functional testing of flashing lights during turn-off phase of lights
DE10164561B4 (en) Circuit arrangement for operating an LED signal
DE10215472B4 (en) Method for operating a lighting device for vehicles with a lamp arrangement having at least one light-emitting diode and illumination device for vehicles
EP1473976B1 (en) Interface for digital and power line control signals and method for dimensioning such an interface
DE102010055296A1 (en) Lamp used in building automation system, has control and/or regulating unit that adjusts power supply voltage as function of signals transmitted through contact terminals, electric current values, type and working stress level
EP1603368A2 (en) Circuit for operating a lighting device
EP3163979A1 (en) Light module and a method for operating a light module
DE202020105977U1 (en) Phase dimmer
DE10233876B4 (en) Circuit arrangement for controlling two independent loads operable with a rectified AC voltage
DE202016003785U1 (en) Device for replacing a light bulb
AT14097U1 (en) Control device and method for data transmission via a load line
CH501285A (en) Circuit for monitoring the operational readiness of at least one DC-fed signal lamp and the transistor controlling it
DE102016007366B4 (en) Incandescent emulation
DE102006042470A1 (en) Circuit arrangement for use for simulating load of direction indicator lamp of motor vehicle, has partial loads producing constant current with voltages, and another partial load providing current, which linearly dependent on voltage
EP1109177A2 (en) Method for switching a load
DE102004033070B3 (en) Circuit arrangement for half-wave detection of a 230 V AC voltage
DE102013105463B3 (en) Operating device and method for operating a dimmable lamp arrangement
WO2017121886A1 (en) Film control device for a liquid crystal film

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SIEMENS AKTIENGESELLSCHAFT

17P Request for examination filed

Effective date: 20140305

RBV Designated contracting states (corrected)

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA RS

RIC1 Information provided on ipc code assigned before grant

Ipc: H05B 33/08 20060101AFI20140424BHEP

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20141129