EP1417864B1 - Signal lumineux destine a la commande du trafic et procede de controle du fonctionnement d'un tel signal - Google Patents

Signal lumineux destine a la commande du trafic et procede de controle du fonctionnement d'un tel signal Download PDF

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Publication number
EP1417864B1
EP1417864B1 EP02760115A EP02760115A EP1417864B1 EP 1417864 B1 EP1417864 B1 EP 1417864B1 EP 02760115 A EP02760115 A EP 02760115A EP 02760115 A EP02760115 A EP 02760115A EP 1417864 B1 EP1417864 B1 EP 1417864B1
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EP
European Patent Office
Prior art keywords
light
led
emitting diodes
current
monitoring
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.)
Expired - Lifetime
Application number
EP02760115A
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German (de)
English (en)
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EP1417864A1 (fr
Inventor
Bernhard Hering
Rudolf Schierjott
Gerhard Treffer
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Siemens AG
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Siemens AG
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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/58—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving end of life detection of LEDs
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection

Definitions

  • the invention relates to a traffic light for traffic control, in particular road traffic, according to the preamble of claim 1 and a method for monitoring the operation of such a sign according to the preamble of claim. 8
  • Incandescent lamps may fail due to short-circuiting or interruption, causing a character to be generated by them to be mutilated, insufficiently lit, or not displayed at all. In order to avoid misleading the traffic participants, an incorrectly displayed light signal must be switched off immediately to avoid an accident risk. In order to be able to check the availability of a safety-relevant sign, such as a red traffic light, a speed limit or a warning display, even when it is switched off, the monitoring must be active, even when the corresponding sign is not active, ie not lit.
  • a safety-relevant sign such as a red traffic light, a speed limit or a warning display
  • a high-impedance voltage divider is connected whose center potential serves as a criterion when checking a lamp state.
  • the microprocessor checks the value of the center potential of the voltage divider every 10 ms. When the light is on, the potential is 12V when it is off, 0V. However, in the event of a short circuit in the lamp circuit, it is 0V in both cases.
  • the test must be extended. to include the OFF mode with the light on and the ON mode with the light off.
  • a switched on lamp is switched off by the system once per second for approx. 100 ms; if it is off, the system will periodically turn on every 40 s for 100 ms. The test starts when the engine is started and ends 100 seconds after stopping. This prolonged operation ensures that lamp failures are also detected during the cooling period of the filament.
  • the incandescent lamp is increasingly replaced by the LED, hereinafter abbreviated by LED, displaced as a low-maintenance and high-availability light source for optical characters many advantages for the economic operation of Traffic lights offers.
  • the problem is that LED-generated characters could previously only be monitored in the switched-on state.
  • the LED technology for safety-relevant characters which must be monitored for functionality even when switched off, could not be used. Due to the quasi-inertia-free conversion of electricity into light in LED light sources, a functional test analogous to the so-called cold lamp test was not possible without producing disturbing and thus unacceptable light flashes.
  • European Patent Application EP 0 434 859 A1 discloses an arrangement for monitoring the operation of an incandescent lamp. With no visible effect of the incandescent lamp, the continuity of the circuit is checked with low energy when switched off. In order to distinguish in such a review a short circuit or shunt generated continuity of the circuit from the continuity of the circuit with working light bulb and exclude positive test results despite defective light bulb, the ratio of the resistance of the device in the off state of the light bulb to the resistance of the device determined in the on state of the incandescent lamp and compared with the valid for each to be monitored incandescent lamp ratio of the cold-hot resistance.
  • the patent application FR 2 724 749 A1 relates to a lamp with LEDs of a signal generator for road traffic with means for its function monitoring.
  • a controller between the light emitting diodes and the control unit allows the conventional Use of presence or absence of power to monitor the operation of the lamp.
  • a current mirror allows the passage of a current proportional to that at the terminals of the group of light-emitting diodes forming the lamp during the intervals in which the light-emitting diodes are nonconductive. This ensures the continuity of supply of the lamp while the LEDs are nonconductive at the zero crossing of the AC supply.
  • the current may be interrupted by a switch which is controlled by a circuit monitoring the current through the light emitting diodes. When the current drops to a level indicative of a failure of a certain number of light emitting diodes, the switch is opened or it may be actuated in response to an operating controller.
  • US Pat. No. 6,147,617 discloses an apparatus and a method for fault detection of outdoor displays. Such displays are constructed of light-emitting elements such as colored light emitting diodes and small phosphor display tubes in matrix form to output character-based information, still images, dynamic images and so on.
  • the display includes an error detection circuit comprising a unit pixel having a plurality of light emitting diodes, a pixel driver, a voltage divider detector, and an operational amplifier. In the off state, a leakage current is converted by the light emitting diodes into a voltage, which is applied to the voltage divider. The output of the voltage divider is compared by an operational amplifier with a reference value. If the output of the voltage divider is smaller, a failure of the unit pixels is detected.
  • the invention is therefore based on the object to provide a light signal and a method for monitoring the function of a character of the type mentioned, so that at reasonable technical effort, the functionality of the Sign can be monitored both in the on and in the off state.
  • a subtask is achieved by a light signal of the type mentioned above with the features mentioned in the characterizing part of patent claim 1.
  • the light emission of the LED that enters immediately can be restricted in such a way that it is no longer perceptible to the viewer even in the dark.
  • the road users disturbing light flashes are avoided.
  • As a criterion for the functionality of the current increase is used by the LEDs.
  • the monitoring device of the light signal comprises switching means for switching off the switched on current upon reaching a predetermined threshold value for the current intensity.
  • the limitation of the current flowing through the LEDs electric current is achieved here by specifying a maximum threshold value at which the building up LED current is turned off.
  • the switching means are designed as a digital logic circuit with a memory element.
  • the realization of the LED current limitation can be done for example by using a D flip-flop as a memory element and by means of other standard components of semiconductor circuit technology.
  • the monitoring device is further designed to measure the voltage drop across the energized light-emitting diodes. Through this separate additional monitoring of the voltage, a failed LED can be detected despite LED current flow, such as a short circuit. This increases the reliability of the functional test of a light signal according to the invention.
  • the light sources are arranged as a chain of light-emitting diodes connected in series or as a cluster of light-emitting diodes connected to one another. This is advantageously used in the design of light signals with linear symbols or planar structures.
  • inventive light signals with function monitoring in traffic signs especially in such with changing display option different characters, or in traffic lights, so the well-known traffic lights, used.
  • the other sub-task is solved by a method of the type mentioned above with the features mentioned in the characterizing part of claim 8.
  • the current supply of the light-emitting diodes is first turned on, the current monitoring signal representing the current through the LEDs is generated, and the energization is switched off again when a predetermined threshold value for the current monitoring signal
  • the designed as light emitting diodes light source of the light signal are so limited energized in the function monitoring in that only a light emission which is no longer perceptible by the viewer takes place.
  • a voltage monitoring signal representing the voltage dropping across the energized light-emitting diodes is additionally generated.
  • the voltage monitoring signal is used as an additional criterion in the assessment of the functionality of a light-emitting diode in order to exclude a short circuit in the case of a positive LED energization.
  • the energization takes place in an inactive state or periodically in an inactive phase of the light emitting diode.
  • the function monitoring can be performed both when the light is - even for a longer period of several months - not in operation, as well as during operation, in which the regular LED lighting is turned off periodically for a short phase, in which then the even shorter test current takes place.
  • An inventive light signal such as a variable message sign for the alternate display of different traffic signs is generated, for example, in a trained as a sign bridge on roadways outdoor facility.
  • the outdoor unit has a power supply for powering the LED strings, using a standard 48 V DC industrial switching power supply with 100 W input power. It is connected via a CAN bus to a route station, which includes a modem as well as a control and a master module. For example, 32 LED chains, divided into four groups of eight each, can be controlled via a common control module.
  • the control module contains a digital part and an analog part.
  • the digital part has modules for initialization, module detection, read / write logic, a test register, normal and test mode enable logic, LED current setting, and current and voltage monitoring, while the 32 LED current regulators provide Form analog part. Up to 8 such control modules can be connected to a common control unit. Control is provided by a processor module that executes a stored program for driving and monitoring the LED strings.
  • a light-emitting diode chain for example, 11 to 19 series connected LEDs LED.
  • Each LED chain is driven according to FIG. 1 by a transistor Q3 connected as a current source.
  • As a command variable for the current is the output voltage of a digital-to-analog converter DAC, which is applied via a transistor Q4 to the base of the transistor Q3. If a positive drive signal is present at the LED turn-on signal LE, after a circuit-related delay time of approximately 1 ⁇ s in the transistor Q3, a collector current which approximately corresponds to the quotient of the voltage of the converter DAC and the resistor R5 is established.
  • This constant current flows minus a small current flowing through the resistors R2 and R3 cross-flow as a working current through the LED chain.
  • the chain current causes a voltage drop in a resistor R1 upstream of the LED chain which, when the collector-emitter threshold of a transistor Q1 is reached, triggers it and generates the current monitoring signal IO.
  • Resistors R2 and R3 also drive a transistor Q2 when the voltage drop across the LED string reaches a value set by voltage dividing ratio R2 to R3, thus generating a voltage monitoring signal UO through transistor Q2.
  • For signal conversion to TTL level serve resistors R6 and R7 or R8 and R9.
  • the monitoring signals IO and UO are stored in the control module and reported back to the control unit and processed there.
  • the current monitoring is done for all chains with a uniform, fixed threshold: The current sensor output shows "OFF” if the chain current is less than 4 mA and it shows “ON” if it is greater than 7 mA.
  • the voltage monitoring of all LED chains with a uniform, fixed threshold In test mode, all LED strings are checked cyclically and current errors are found within 10 s. In normal and test mode, an LED string will fail if the default set point for the voltage is "ON" and the actual measured sensor current value is "OFF” at the same time. A current error will only switch off if a currently required character is no longer recognizable can. A character is no longer representable if the number of defective LED strings exceeds the supplied limit.
  • the LED drive signal with active light source is constructed periodically according to FIG 2 with a period T period of, for example, 10.0 ms.
  • a period begins at the starting point t 0 and is subdivided into a lighting time T light , that is to say the maximum LED energizing time of, for example, 9.0 ms, and a test time T pause of, for example, 1.0 ms.
  • the lighting time T light is composed of the actual energizing time T current , which is about 0.1 to 1.0 times the lighting time T light for dimming depending on the ambient brightness.
  • the test time T break the maximum 0.3 ⁇ s long test pulse T test for monitoring the function of the LED chain takes place.
  • test pulse T test can not only take place in a periodic interruption of the lighting time T light , but also in a longer-lasting inactive state of the light source, so that the availability of the light signal for a safety-relevant application can be checked at any time.
  • the maximum LED lighting time required for the purpose of avoiding visible flashes of light is achieved by supplementing the current regulator circuit - as described in FIG. 1 - with a logic circuit according to FIG.
  • the LED switch-on signal LE is controlled via the output OR_out of an OR gate OR, eg of the type 74HC32.
  • OR OR gate
  • the input OR_in1 is 1 and thus the output OR_out is also 1.
  • test mode the LED input OR_in1 is equal to 0 and the test input is equal to 1. This is located at one input XOR_in2 of an EXOR gate XOR, eg Type 74HC86, on.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Traffic Control Systems (AREA)
  • Road Signs Or Road Markings (AREA)
  • Time Recorders, Dirve Recorders, Access Control (AREA)

Claims (10)

  1. Signal lumineux destiné à la commande du trafic, en particulier du trafic routier, comprenant des sources lumineuses pour produire le signal et un équipement de contrôle pour contrôler le fonctionnement des sources lumineuses, les sources lumineuses étant conçues sous forme de diodes électroluminescentes (DEL) et l'équipement de contrôle étant conçu pour une alimentation électrique limitée des diodes électroluminescentes (DEL), caractérisé en ce que l'équipement de contrôle comprend des moyens de commutation pour que l'alimentation électrique activée soit désactivée à l'atteinte d'une valeur de seuil prescrite de l'intensité du courant, la durée d'alimentation électrique étant limitée de telle sorte que l'émission lumineuse des diodes électroluminescentes (DEL) n'est pas perceptible par un observateur.
  2. Signal lumineux suivant la revendication 1, caractérisé en ce que les moyens de commutation sont réalisés sous forme de circuit logique numérique pourvu d'un élément (FF) de mémoire.
  3. Signal lumineux suivant la revendication 1 ou 2, caractérisé en ce que l'équipement de contrôle est conçu en outre pour mesurer la baisse de tension au niveau des diodes électroluminescentes (DEL) alimentées électriquement.
  4. Signal lumineux suivant l'une des revendications 1 à 3, caractérisé en ce que les sources lumineuses sont disposées sous la forme d'une chaîne de diodes électroluminescentes (DEL) reliées en série.
  5. Signal lumineux suivant l'une des revendications 1 à 3, caractérisé en ce que les sources lumineuses sont disposées sous la forme d'un groupe de diodes électroluminescentes (DEL) reliées entre-elles.
  6. Panneau de signalisation routière, en particulier pour la représentation alternée de différents signaux, comportant un signal lumineux suivant l'une des revendications 1 à 5.
  7. Installation de signalisation lumineuse, en particulier feux de circulation, comportant un signal lumineux suivant l'une des revendications 1 à 5.
  8. Procédé de contrôle du fonctionnement d'un signal lumineux destiné à la commande du trafic, en particulier du trafic routier, comprenant des sources lumineuses réalisées sous forme de diodes électroluminescentes (DEL) pour produire le signal, caractérisé en ce qu'on active l'alimentation électrique des diodes électroluminescentes (DEL), en ce qu'on génère un signal de surveillance de courant représentatif de l'intensité du courant dans les diodes électroluminescentes (DEL), et en ce qu'on désactive l'alimentation électrique à l'atteinte d'une valeur de seuil prescrite du signal de surveillance de courant, la durée d'alimentation électrique étant limitée de telle sorte que l'émission lumineuse des diodes électroluminescentes (DEL) n'est pas perceptible par un observateur.
  9. Procédé suivant la revendication 8, caractérisé en ce qu'on génère en outre un signal de surveillance de tension représentatif de la baisse de tension au niveau des diodes électroluminescentes alimentées électriquement.
  10. Procédé suivant la revendication 8 ou 9, caractérisé en ce que l'alimentation électrique s'effectue dans un état inactif ou de façon périodique dans une phase inactive des diodes électroluminescentes.
EP02760115A 2001-08-16 2002-08-05 Signal lumineux destine a la commande du trafic et procede de controle du fonctionnement d'un tel signal Expired - Lifetime EP1417864B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10140331A DE10140331C2 (de) 2001-08-16 2001-08-16 Lichtzeichen zur Verkehrssteuerung und Verfahren zur Funktionsüberwachung eines solchen Zeichens
DE10140331 2001-08-16
PCT/DE2002/002877 WO2003017728A1 (fr) 2001-08-16 2002-08-05 Signal lumineux destine a la commande du trafic et procede de controle du fonctionnement d'un tel signal

Publications (2)

Publication Number Publication Date
EP1417864A1 EP1417864A1 (fr) 2004-05-12
EP1417864B1 true EP1417864B1 (fr) 2006-01-11

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Country Status (8)

Country Link
US (1) US7129856B2 (fr)
EP (1) EP1417864B1 (fr)
AT (1) ATE315885T1 (fr)
CA (1) CA2457620A1 (fr)
DE (2) DE10140331C2 (fr)
HU (1) HUP0401026A2 (fr)
NO (1) NO20040669L (fr)
WO (1) WO2003017728A1 (fr)

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DE112011100594B4 (de) * 2010-02-18 2015-09-03 Tridonic Ag LED-Spannungsmessung
EP3236713A1 (fr) 2016-04-22 2017-10-25 Siemens Aktiengesellschaft Surveillance de fonctionnement de signaux lumineux à del
DE102016206878A1 (de) 2016-04-22 2017-10-26 Siemens Aktiengesellschaft Funktionsüberwachung von LED-Lichtzeichen

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ATE315885T1 (de) 2006-02-15
CA2457620A1 (fr) 2003-02-27
DE10140331C2 (de) 2003-11-06
HUP0401026A2 (en) 2004-08-30
WO2003017728A1 (fr) 2003-02-27
DE50205600D1 (de) 2006-04-06
DE10140331A1 (de) 2003-04-03
EP1417864A1 (fr) 2004-05-12
US7129856B2 (en) 2006-10-31
US20040201496A1 (en) 2004-10-14
NO20040669L (no) 2004-02-16

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