EP2979954B1 - Unite del pour emetteur de signaux lumineux, emetteur de signaux lumineux ayant une telle unite et procede de surveillance d'une chaine de del d'une unite del - Google Patents

Unite del pour emetteur de signaux lumineux, emetteur de signaux lumineux ayant une telle unite et procede de surveillance d'une chaine de del d'une unite del Download PDF

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Publication number
EP2979954B1
EP2979954B1 EP15178874.2A EP15178874A EP2979954B1 EP 2979954 B1 EP2979954 B1 EP 2979954B1 EP 15178874 A EP15178874 A EP 15178874A EP 2979954 B1 EP2979954 B1 EP 2979954B1
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EP
European Patent Office
Prior art keywords
led
voltage
switching
unit
led string
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Application number
EP15178874.2A
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German (de)
English (en)
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EP2979954A3 (fr
EP2979954A2 (fr
Inventor
Helmut Ulmer
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Pintsch GmbH
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Pintsch GmbH
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Publication of EP2979954A3 publication Critical patent/EP2979954A3/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L7/00—Remote control of local operating means for points, signals, or track-mounted scotch-blocks
    • B61L7/06—Remote control of local operating means for points, signals, or track-mounted scotch-blocks using electrical transmission
    • B61L7/08—Circuitry
    • B61L7/10—Circuitry for light signals, e.g. for supervision, back-signalling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L29/00—Safety means for rail/road crossing traffic
    • B61L29/24—Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning
    • B61L29/28—Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning electrically operated
    • 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
    • B61L5/1836—Daylight signals using light sources of different colours and separate optical systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L9/00—Illumination specially adapted for points, form signals, or gates
    • B61L9/04—Illumination specially adapted for points, form signals, or gates electric
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/095—Traffic lights
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology
    • 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
    • H05B45/54—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a series array of LEDs
    • 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]
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
    • G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
    • G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
    • G08B5/38—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources using flashing light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology

Definitions

  • the invention relates to an LED unit for light signal transmitters, in particular for level crossings, and a light signal transmitter provided with a corresponding unit, in particular for level crossings.
  • the invention also relates to a method for monitoring at least one LED string of an LED unit.
  • light signal generators for level crossings are known. They are used to generate optical signals at level crossings that warn road users of an approaching train. They are usually constructed in such a way that a yellow and a red signal light are arranged on a post above a so-called St. Andrew's cross, whereby when a train approaches, the yellow signal light is first switched on to give road users the opportunity to evacuate the immediate danger area after a certain period of time, e.g. 3 to 5 seconds, the red signal light is switched on to indicate that the danger area is no longer allowed to be driven into or entered.
  • a certain period of time e.g. 3 to 5 seconds
  • LEDs are usually provided with small reflectors on their rear side facing away from the viewer, which focus the emitted light in the direction of the viewer. If you want to replace a large number of "normal" LEDs with a few high-power LEDs, the problem arises that the known current monitoring fails if an LED fails due to an internal short circuit. In the event of such a short circuit, a current continues to flow, so that the known current monitoring does not report an error.
  • level crossing light signal generator is also attached as a side light to an existing traffic light signal generator (usually a traffic light).
  • traffic light signal generator usually a traffic light
  • Such arrangements can be found at road junctions in the area of a level crossing.
  • light signal transmitters as so-called “single lights” in the colors yellow, red and green.
  • EP 1 045 360 A1 a method for operating a traffic light signaling system is known in which the red light of the road traffic light signal generator is to be used at the same time as red light for a level crossing light signal generator, so that there is no need for separate, side by side light signal generators for level crossing and road traffic.
  • EP 1 045 360 A1 suggests the respective Form a red signal by a plurality of LEDs, which are divided into several series circuits. There is also the problem of functionality monitoring when using high-power LEDs.
  • Fig. 3 illustrates an example of the course of diode forward voltages U of the two LED strings of such an LED unit over time, with values shown as triangles for the first and values shown as squares for the second LED strand of the LED unit.
  • the switch-on time of the LED unit is at the intersection of the time axis with the ordinate.
  • the diode forward voltage in each of the LED strings decreases in an initialization phase up to time t1, in particular due to heating of the LEDs, until stabilization below a threshold value occurs.
  • the differences in the diode forward voltages between the LED strings increase.
  • the pamphlets EP 1 965 609 A2 , EP 2 247 161 A1 , EP 0 955 619 A1 , US 2013/0026926 A1 , US 2012/0074856 A1 , US 2012/0200296 A1 , DE 199 29 430 A1 and US 2012/0313528 A1 teach how an LED failure can be detected on the basis of a comparison of the forward voltages between two LED strings.
  • An LED arrangement for light signal generators comprises a first and a further strand of series-connected high-power LEDs, wherein the LEDs of the two strands are arranged on a common circuit board and can be supplied with power separately from one another in order to stimulate the LEDs in the respective strand to glow, the LEDs in the at least two strings are arranged on the board in such a way that the LEDs of the first strand produce essentially the same light distribution as the LEDs of the further strand and with means for monitoring the current flowing during operation of a strand and the voltage dropping on the strand being provided and wherein a control unit is provided for automatic switching to another line in the event of failure of an operated line or an LED of one of the operated line.
  • the object of the invention is to enable LED units and their operation with high operational reliability for light signal generators, in particular for level crossings, which are improved under at least one of the following aspects: operational reliability, costs, low retrofitting, maintenance, service life.
  • the LED unit according to the invention is defined in claim 1.
  • the method according to the invention is defined in claim 9.
  • the second threshold value is in particular a voltage threshold value for the first derivative according to the time of as exemplarily in FIG Fig. 3 illustrated voltage curves.
  • FIG Fig. 3 illustrates that during initialization there is still no change in the flow voltage due to heating and, in the operating phase, small changes in the flow voltage due to heating occur at small time intervals.
  • Monitoring or failure signal detection triggers that are subject to slight variations as a result of temperature fluctuations can thus be used.
  • a stable, simple fault detection is thus made possible.
  • the stated point in time, in particular the end of the initialization phase is approximately 0.5 to 3 seconds, advantageously approximately 1 to 2 seconds after the point in time of the start of the first control function, ie the alternating switching on of the LED strings.
  • the different switch-on phases mentioned of one of the LED strings are also advantageously separated in time from another of the LED strings by only one switch-on phase.
  • the time after switching on the LED unit is, for example, from a time of Switching on the LED unit by a first switching-on phase of the first LED string and a first switching-on phase of the second LED string spaced apart.
  • the first threshold value is advantageously smaller than the second threshold value and is between approximately 0.5 and 1 volt, preferably between approximately 0.6 and 0.8 volts, and is more preferably approximately 0.7 volts.
  • the second threshold value is advantageously between approximately 0.8 and 1.2 volts, preferably between approximately 0.9 and 1.1 volts, and is more preferably approximately 1.0 volts.
  • the first and second threshold values can be determined independently of the temperature.
  • the above-mentioned advantageous failure detection signal outputs, monitoring or failure signal detection triggers, times and usable different switch-on phases and threshold values are also advantageous aspects of the method according to the invention for monitoring a first LED string and / or a second LED string of an LED unit for light signal generators, which have a first switching device with a function of connecting the first LED string to a first power source pole and a second switching device with a function of connecting the second LED string to a second power source pole, an opposite pole for both the first and the second power source pole, each comprising of the first and second LED strings is connected between one of the first and second switching devices and the opposite pole, the method alternating switching on of the first and second LED strings with the first and second switching devices, a first S voltage measurement of the diode forward voltage of the first LED string when connected to the first power source pole with the first switching device, a second voltage measurement of the diode forward voltage of the second LED string when connected to the second power source pole with the second switching device, and monitoring for the detection of a Includes failure of
  • the invention is particularly useful in the EP 1 992 542 A2 LED arrangements shown are applicable.
  • a measuring unit function for detection which includes the above-mentioned voltage measuring functions and a comparison of the diode forward voltages determined with the first and second voltage measuring functions and which outputs a failure detection signal if the comparison results in at least one absolute value of a voltage difference above a threshold value, in particular for the first and second LED strings each with a set of high-power LEDs and possibly the same binning for matched power consumption to easily determine a breakdown of one or more individual LEDs of one of the LED strings by comparing the LED strings, in particular their forward voltages.
  • the LED unit is in an operating phase It is easy for one or more individual LEDs of one of the LED strings to be alloyed through by a voltage jump in the forward voltage of the LED string over time. An input voltage measurement makes it possible to determine whether an LED string is switched on. For example, each set can have three to six high-power LEDs.
  • the LED unit is advantageously arranged on a circuit board, which not only makes it easier to retrofit light signal generators.
  • a circuit board can also ensure thermal coupling of the LEDs on both strings. Monitoring or failure detection signal triggers are largely temperature-independent in the invention and do not rely on a thermal coupling of the LEDs of both strings in order to enable reliable comparisons of measured voltages.
  • the object of the invention is also achieved by a light signal transmitter, in particular in the form of a signal light for level crossings, the lighting means of which is formed by an LED unit of the invention on a circuit board and an optical system that includes a collimator and / or a scatter lens for aligning light emitted by the LED strands.
  • the light signal transmitter or its LED unit can be operated according to a method corresponding to the functions of the LED unit or its control.
  • Voltage monitoring which can be provided according to the invention also makes it possible to reliably detect the failure of an individual LED in a string.
  • LED string is understood here to mean a series connection of LEDs.
  • an LED cluster preferably has two to eight LEDs, preferably three to six LEDs, in particular four LEDs.
  • the forward voltage between the first and second LED strings preferably differs by no more than 0.7 volts, preferably no more than 0.5 volts.
  • preference is given to using high-power LEDs with a power consumption of 3 to 7 watts, in particular 5 watts.
  • failure of the light unit is understood here to mean a complete failure of an LED string, both LED strings and / or individual LEDs in an LED string.
  • failure of the light unit is understood here to mean an interrupted flow of current through both LED strings.
  • the opposite pole can be a battery negative pole and each of the first and second power source poles is a battery positive pole of a separate power source or the opposite pole can correspond to a battery center tap if the first and second power source poles second power source poles correspond to a pair of positive and negative battery terminals.
  • the duration of the switch-on phases and / or that of the switch-off phases is typically between approximately 0.5 and 5 seconds, advantageously between approximately 0.5 and 3 seconds, more preferably between approximately 0.5 and 1 seconds.
  • the diode forward voltage changes are monitored between successive switch-on phases of the respectively monitored LED string.
  • the diode forward voltage changes are preferably monitored for each of the LED strings between successive switch-on phases of this LED string.
  • the first and second LED strings 11, 12 each have a set of four high-power LEDs with the same binning.
  • Equal binning means that the LEDs are essentially the same Properties, including forward voltage and power consumption, so that the two LED sets have essentially a homogeneous power consumption.
  • an LED unit operated according to the invention for light signal generators comprises a lighting unit comprising a first LED string 11 and a second LED string 12, a first switching device 21 with a function for connecting the first LED string 11 to a first power source pole 31 and a second switching device 22 with a function of connecting the second LED string 12 to a second power source pole 32, a counter pole 4 for both the first and the second power source pole 31, 32, a return conductor connection common to the first and second LED strings to the counter pole 4, each of the first and second LED strings 11, 12 being connected between one of the first or second switching devices 21, 22 and the opposite pole 4, a controller (in Fig. 1 not fully shown) of the first and second switching devices 21, 22, which comprises a first control function for alternately switching on the first and second LED strings 11, 12 with the first and second switching devices 21, 22.
  • the control includes a measuring unit from which in Fig. 1 Voltage measuring devices 51, 52, 61, 62 and current measuring devices 81, 82 are shown, and has a function for detecting a failure of the lighting unit and a further function for detecting a failure in the lighting unit.
  • a first sub-unit T1 of the measuring unit has an input voltage measuring unit 51 for determining whether the first LED string 11 is switched off and consequently the second LED string 12 (according to the control function for alternately switching on the LED strings) to the second power source pole 32 with the second switching device 22 is connected.
  • this input voltage measuring unit 51 is connected in parallel to the first LED cluster 11 between the first switching device 21 and the return conductor connection.
  • the first sub-unit T1 of the measuring unit also has a diode forward voltage measuring unit 62 to measure the diode forward voltage at the second Measure LED string 12.
  • the input voltage measuring unit 51 and the diode forward voltage measuring unit 62 are part of a voltage measuring function of the diode forward voltage of the second LED string 12 when connected to the second power source pole 32 with the second switching device 22.
  • a second sub-unit T2 of the measuring unit has an input voltage measuring unit 52 for determining whether the second LED string 12 is switched off and consequently the first LED string 11 (according to the control function for alternately switching on the LED strings) to the first power source pole 31 with the first switching device 21 is connected.
  • this input voltage measuring unit 52 is connected in parallel to the second LED cluster 12 between the second switching device 22 and the return conductor connection.
  • the second sub-unit T2 of the measuring unit also has a diode forward voltage measuring unit 61 in order to measure the diode forward voltage on the first LED string 11.
  • the input voltage measuring unit 52 and diode forward voltage measuring unit 61 are part of a voltage measuring function of the diode forward voltage of the first LED string 11 when connected to the first power source pole 31 with the first switching device 21.
  • the function for detecting the measuring unit includes a comparison of the diode forward voltages determined with the two sub-units T1, T2 and voltage measuring functions mentioned and a failure detection signal output if the comparison results in at least one absolute value of a voltage difference above a threshold value.
  • a first value is provided for the threshold value when the first control function is executed for the first time when the LED unit is initialized and a second value is provided for each further execution of the first control function, the first value being lower than the second value.
  • the first value is set to 0.7 volts and the second value to 1.0 volts.
  • first and second current measurement functions it is determined whether the first or second LED string with the respective switching device 21, 22 is connected to the respective current source pole 31, 32, corresponding to the above in connection with the subunits T1, T2 and their input voltage measuring units 51, 52 described functions.
  • the switching devices 21, 22 are each part of a pulse-width-modulated current source (PWM current source) of the respective LED string 11, 12, which they can connect to one of the current source poles 31, 32.
  • PWM current source pulse-width-modulated current source
  • the PWM current sources alternately switch on one of the LED strings 11, 12 from the positive pole as current source pole 31, 32, which are connected via the return conductor connection or a return conductor that is connected to minus.
  • the LED unit is formed on a circuit board with thermal coupling under the first and second LED strings 11, 12.
  • Fig. 2 illustrates in more detail an implementation with the in Fig. 1 illustrated subunits T1, T2.
  • the above power sources have pulse-width modulated DC voltage converters.
  • the first LED string 11 is connected between a first of the DC-DC converters and the opposite pole 4 and the first switching device 21 comprises a MOSFET as a voltage-controlled switch 91 for the function of connecting the first LED string 11 to the first power source pole 31.
  • the second LED- String 12 is connected between a second of the DC voltage converters and the opposite pole 4 and the second switching device 22 comprises two MOSFETs as voltage-controlled switches 92 for the function of connecting the second LED string 12 to the second power source pole 32 or as a further voltage-controlled switch 112B for connection of the second LED cluster 12 to the opposite pole 4.
  • the first and the second DC voltage converter are down converters or buck converters.
  • a gate of the voltage-controlled switch 92 for connecting the second LED string 12 to the second power source pole 32 receives a signal from the controller via a circuit signal resistor 92A.
  • the switches 91, 92 shown are designed as MOSFETs. They are controlled by the controller (not shown) via switch signal resistors 91A, 92A. The control ensures the first and second control functions via the DC / DC converter.
  • Fig. 2 illustrates the voltage monitoring with the subunits T1 and T2 of zu Fig. 1 described embodiment, wherein it is provided that the opposite pole 4 corresponds to a battery center tap, the first power source pole 31 corresponds to a battery positive pole and the second power source pole 32 corresponds to a battery negative pole.
  • the illustrated voltage monitoring can thus be used in particular to monitor the voltage of two batteries.
  • the second DC voltage converter is a step-down converter with the opposite pole 4 and the second voltage source pole 32 as the voltage output and the second LED cluster 12 and the second voltage source pole 32 at the voltage input and with a diode 112 as the opposite pole 4 is a battery center tap preserved pole provided.
  • the second power source pole 32 is the battery negative pole in the illustrated embodiment.
  • each of the subunits T1, T2 has two combinations of a comparator N5, N6, N7, N8 and a measuring resistor R5, R6, R7, R8 connecting the comparator inputs.
  • comparators are connected to one another via inputs of different polarity and the corresponding connection branches off to the opposite pole 4, ie the central battery tap.
  • a comparator pair formed from comparators N5, N6 of the first and second subunits T1, T2 is connected with its plus inputs to the first LED string 11 via resistors R9, R12, namely with its connected to the choke coil 101 of the first DC voltage converter The End.
  • another pair of comparators N7, N8 selected from the first and second subunits T1, T2 is connected with its negative inputs to the second LED string 12 via resistors R10, R11, namely with its connected to the choke coil 102 of the second DC-DC converter The End.
  • an input voltage of the first LED string 11 is obtained at the output of the comparator N5
  • a diode forward voltage of the first LED string 11 is obtained at the output of the comparator N6
  • an input voltage of the second LED is obtained at the output of the comparator N7.
  • String 12 is obtained and a diode forward voltage of the first LED string 11 is obtained at the output of the comparator N8.
  • Under received Voltage is to be understood as a voltage value representing the corresponding voltage.
  • the LEDs of both LED strings 11, 12 do not have to be on a circuit board and with thermal coupling, e.g. be arranged by placing the LEDs of the first and second groups together on a printed circuit board and a heat sink, in order to allow voltage monitoring in such a way that LEDs with different voltage BINs can be operated up to the maximum permissible line resistance.
  • thermal coupling e.g. be arranged by placing the LEDs of the first and second groups together on a printed circuit board and a heat sink, in order to allow voltage monitoring in such a way that LEDs with different voltage BINs can be operated up to the maximum permissible line resistance.
  • a short circuit in an LED string 11, 12, in particular as a result of the alloying of an LED in one of the LED strings, can be reliably detected by the voltage monitoring.
  • Voltage monitoring based on a comparison of the two LED strings 11, 12 in an initialization phase for example up to one as in FIG Fig. 3 illustrated time t1 after switching on the LED unit.
  • the initialization phase can also include only one switch-on for each of the two LED strings 11, 12, that is to say the first switch-on after the LED unit is switched on. In other words, this initialization phase includes an alternating switching on of the two LED strings 11, 12. In particular with short switching on phases of the LED strings 11, 12, only slight jumps in the diode forward voltage will then occur in each of the LED strings 11, 12.
  • the duration of the switch-on phases is advantageously selected between approximately 0.5 and 5 seconds, more advantageously between approximately 0.5 and 3 seconds and in particular between approximately 0.5 and 1 seconds.
  • the diode forward voltage changes are then monitored between successive switch-on phases of the LED string being monitored in each case.
  • the diode forward voltage changes are preferably monitored for each of the LED strings between successive switch-on phases of this LED string.
  • the voltage of both LED strings 11, 12 resulting from the respective diode forward voltages of the string LEDs is determined as initialization.
  • the difference between the two voltages must not be greater than 0.7 volts. If this is ensured as initialization, the operating phase (normal operation) begins. In the operating phase it is then monitored whether no voltage jump greater than 1 volt has occurred from the last voltage value. A temperature adjustment of the voltage limits is not necessary and is not applicable.
  • a procedure carried out with the LED unit works independently of the voltage BIN of the LEDs if the comparison is made with a corresponding tolerance specification. If an LED fails, a difference between the diode forward voltages of the two LED strings 11, 12 0 and exceeds or falls below a specified detectable tolerance. A tight tolerance specification is permitted, since forward voltage fluctuations due to production tolerances of the LEDs are averaged by comparing forward voltages of the first and second groups. When monitoring the pair of first and second LED strings 11, 12 it is provided that the LEDs in each of the strings have an LED current of the same size flowing through them.

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

Claims (14)

  1. Unité de DEL pour émetteur de signaux lumineux, comprenant:
    - une unité lumineuse comprenant une première chaîne de DEL (11) et une deuxième chaîne de DEL (12),
    - un premier dispositif de commutation (21) pour connecter la première chaîne de DEL (11) à un premier pôle de source de courant (31) et un deuxième dispositif de commutation (22) pour connecter la deuxième chaîne de DEL (12) à un deuxième pôle de source de courant (32),
    - un pôle opposé (4) aussi bien pour le premier que pour le deuxième pôle de source de courant (31, 32), chacune des première et deuxième chaînes de DEL (11, 12) étant connectée entre l'un des premier ou bien deuxième dispositifs de commutation (21, 22) et le pôle opposé (4),
    - une commande des premier et deuxième dispositifs de commutation (21, 22), qui est configurée pour exécuter une première fonction de commande pour allumer de façon alternante les première et deuxième chaînes de DEL (11, 12) avec les premier et deuxième dispositifs de commutation (21, 22), et
    - une unité de mesure (51, 52, 61, 62) de la commande pour détecter une panne dans l'unité lumineuse,
    caractérisée par
    - un premier convertisseur de tension continue, la première chaîne de DEL (11) étant connectée entre le premier convertisseur de tension continue et le pôle opposé (4), et le premier dispositif de commutation (21) comprenant un premier interrupteur commandé en tension (91) du premier convertisseur de tension continue pour connecter la première chaîne de DEL (11) au premier pôle de source de courant (31),
    - un deuxième convertisseur de tension continue, la deuxième chaîne de DEL (12) étant connectée entre le deuxième convertisseur de tension continue et le pôle opposé (4), et le deuxième dispositif de commutation (22) comprenant un deuxième interrupteur commandé en tension (92) du deuxième convertisseur de tension continue pour connecter la deuxième chaîne de DEL (12) au deuxième pôle de source de courant (32),
    dans lequel l'unité de mesure (51, 52, 61, 62) est configurée pour exécuter les sous-fonctions suivantes de la détection d'une panne dans l'unité lumineuse (11, 12):
    - une première fonction de mesure de tension de la tension en direct de diode de la première chaîne de DEL (11) lorsqu'elle est connectée au premier pôle de source de courant (31) avec le premier dispositif de commutation (21),
    - une deuxième fonction de mesure de tension de la tension en direct de diode de la deuxième chaîne de DEL (12) lorsqu'elle est connectée au deuxième pôle de source de courant (32) avec le deuxième dispositif de commutation (22),
    - une sortie de signal de détection de panne lorsque
    -- jusqu'à un instant après l'allumage de l'unité de DEL, une valeur absolue d'une différence de tension entre la tension en direct de diode déterminée avec la première et avec la deuxième fonction de mesure de tension dépasse une première valeur de seuil ou
    -- une valeur absolue d'une différence de tension de tensions en direct de diode qui sont mesurées dans différentes phases d'allumage de l'une des chaînes de DEL (11, 12) au moins en partie après le moment de l'une des fonctions de mesure de tension, dépasse une deuxième valeur de seuil.
  2. Unité de DEL pour émetteur de signaux lumineux selon la revendication 1, dans laquelle la sortie de signal de détection de panne est prévue aussi bien lorsque la première valeur de seuil est dépassée par la valeur absolue de la différence de tension des tensions en direct de diode mesurées avec la première fonction de mesure de tension après le moment, que lorsque la deuxième valeur de seuil est dépassée par la valeur absolue de la différence de tension des tensions en direct de diode mesurées avec la deuxième fonction de mesure de tension après le moment.
  3. Unité de DEL pour émetteur de signaux lumineux selon la revendication 1 ou 2, dans laquelle la première valeur de seuil est inférieure à la deuxième valeur de seuil.
  4. Unité de DEL pour émetteur de signaux lumineux selon l'une quelconque des revendications précédentes, dans laquelle l'instant après avoir allumé l'unité de DEL est espacé dans le temps d'un moment où l'unité de DEL est allumée par une première phase d'allumage de la première chaîne de DEL (11) et une première phase d'allumage de la deuxième chaîne de DEL (12).
  5. Unité de DEL pour émetteur de signaux lumineux selon l'une quelconque des revendications précédentes, dans laquelle les différentes phases d'allumage de l'une des chaînes de DEL (11, 12) sont espacées dans le temps par une phase de mise hors circuit de cette chaîne de DEL.
  6. Unité de DEL pour émetteur de signaux lumineux selon la revendication 5, dans laquelle la durée de chacune des phases d'allumage et des phases de mise hors circuit est comprise entre 0,5 et 1 seconde.
  7. Unité de DEL pour émetteur de signaux lumineux selon l'une quelconque des revendications précédentes,
    caractérisée en ce que les première et deuxième chaînes de DEL (11, 12) présentent chacune un ensemble de DEL haute puissance, dans laquelle chaque ensemble comprend trois à six DEL haute puissance.
  8. Emetteur de signaux lumineux, en particulier feu de signalisation pour passages à niveau, dont le moyen lumineux est formé à l'aide d'une unité de DEL selon l'une quelconque des revendications précédentes sur une carte de circuit imprimé et une optique qui comprend un collimateur et/ou une lentille de diffusion pour orienter de la lumière qui est émise par les chaînes de DEL (11, 12).
  9. Procédé de surveillance d'une première chaîne de DEL (11) et d'une deuxième chaîne de DEL (12) d'une unité de DEL pour un émetteur de signaux lumineux, dans lequel ladite unité de DEL comprend un premier dispositif de commutation (21) pour connecter la première chaîne de DEL (11) à un premier pôle de source de courant (31), un deuxième dispositif de commutation (22) pour connecter la deuxième chaîne de DEL (12) à un deuxième pôle de source de courant (32) et un pôle opposé (4) aussi bien pour le premier que pour le deuxième pôle de source de courant (31, 32), dans lequel chacune des première et deuxième chaînes de DEL (11, 12) est connectée entre l'un des premier ou bien deuxième dispositifs de commutation (21, 22) et le pôle opposé (4),
    le procédé comprenant:
    - un allumage alterné des première et deuxième chaînes de DEL (11, 12) avec les premier et deuxième dispositifs de commutation (21, 22),
    - une première mesure de tension de la tension en direct de diode de la première chaîne de DEL (11) lorsqu'elle est connectée au premier pôle de source de courant (31) avec le premier dispositif de commutation (21),
    - une deuxième mesure de tension de la tension en direct de diode de la deuxième chaîne de DEL (12) lorsqu'elle est connectée au deuxième pôle de source de courant (32) avec le deuxième dispositif de commutation (22), et
    - une surveillance pour la détection d'une panne dans une unité de détection,
    caractérisé en ce que
    - la surveillance est une surveillance
    -- de savoir si, jusqu'à un instant après l'allumage de l'unité de DEL, une valeur absolue d'une différence de tension entre la tension en direct de diode déterminée avec la première et celle déterminée avec la deuxième mesure de tension dépasse une première valeur de seuil ou
    -- une valeur absolue d'une différence de tension de tensions en direct de diode qui sont mesurées dans différentes phases d'allumage de l'une des chaînes de DEL (11, 12) au moins en partie après le moment de l'une des mesures de tension, dépasse une deuxième valeur de seuil.
  10. Procédé selon la revendication 9, dans lequel la surveillance comprend une sortie de signal de détection de panne, à savoir aussi bien lorsque la première valeur de seuil est dépassée par la valeur absolue de la différence de tension des tensions en direct de diode mesurées avec la première mesure de tension après le moment, que lorsque la deuxième valeur de seuil est dépassée par la valeur absolue de la différence de tension des tensions en direct de diode mesurées avec la deuxième mesure de tension après le moment.
  11. Procédé selon la revendication 9 ou 10, dans lequel la première valeur de seuil est inférieure à la deuxième valeur de seuil.
  12. Procédé selon la revendication 9, 10 ou 11, dans lequel l'instant après avoir allumé l'unité de DEL est espacé dans le temps d'un moment où l'unité de DEL est allumée par une première phase d'allumage de la première chaîne de DEL (11) et une première phase d'allumage de la deuxième chaîne de DEL (12).
  13. Procédé selon la revendication 9, 10, 11 ou 12, dans lequel les différentes phases d'allumage de l'une des chaînes de DEL (11, 12) sont espacées dans le temps par une phase de mise hors circuit de cette chaîne de DEL.
  14. Procédé selon la revendication 13, dans lequel la durée de chacune des phases d'allumage et des phases de mise hors circuit est comprise entre 0,5 et 1 seconde.
EP15178874.2A 2014-07-29 2015-07-29 Unite del pour emetteur de signaux lumineux, emetteur de signaux lumineux ayant une telle unite et procede de surveillance d'une chaine de del d'une unite del Active EP2979954B1 (fr)

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EP3787374A1 (fr) * 2019-08-30 2021-03-03 Siemens Mobility AG Système et procédé de vérification du luminaire d'un point d'éclairage équipé d'au moins un moyen d'éclairage à led

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DE19929430B4 (de) 1999-06-26 2008-10-09 Daimler Ag Leuchtdioden-Schlußleuchte
DE19947688A1 (de) 1999-09-24 2001-04-05 Siemens Ag LED-Lichtsignal
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