EP2818027B1 - Procédé permettant de faire fonctionner un circuit pour un réseau de diodes électroluminescentes alimentées en courant constant, avec détection d'erreurs - Google Patents

Procédé permettant de faire fonctionner un circuit pour un réseau de diodes électroluminescentes alimentées en courant constant, avec détection d'erreurs Download PDF

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Publication number
EP2818027B1
EP2818027B1 EP13702013.7A EP13702013A EP2818027B1 EP 2818027 B1 EP2818027 B1 EP 2818027B1 EP 13702013 A EP13702013 A EP 13702013A EP 2818027 B1 EP2818027 B1 EP 2818027B1
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control
period
fact
procedure
accordance
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German (de)
English (en)
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EP2818027A1 (fr
Inventor
Dieter Nietfeld
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Hella GmbH and Co KGaA
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Hella KGaA Huek and Co
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • 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

Definitions

  • a failure of a light-emitting diode could, for example, be caused by a short circuit of the light-emitting diode or an interruption of the current path via the light-emitting diode.
  • the invention was based on the problem arising from the document DE 10 2005 012 625 A1 Known method of the type mentioned above to improve so that when the switching element is turned off in a series circuit, there is no instantaneous increase in the voltage in the supply line of the LEDs.
  • control and / or regulating means shortly before or at the same time at the end of a pulse duration, the current source so that the current is reduced, by the amount of current through the series circuit, the controllable switching element is driven to open at the end of the pulse duration by the control and / or regulating means.
  • a current can flow only through the light-emitting diode arranged in series with the closed controllable switching element. According to the electrical properties of the light emitting diode and the controllable switching element then sets a voltage across the energized series circuit. This voltage can be detected and be a basis for failure detection. Outside the diagnostic time, a plurality of controllable switching elements can be closed at the same time so that current can flow simultaneously through a plurality of series connections.
  • each controllable switching element can be switched on for the diagnosis time in n consecutive clock periods. This ensures that the failure of one light-emitting diode is detected at the latest after n clock periods. But it is also possible to choose a different rhythm in the control of the controllable switching elements to close. In particular, it is also possible to select random controllable switching elements to be closed during the diagnosis time.
  • the diagnostic time during which a controllable switching element is driven to close may be part of the pulse duration during which the same switching element is driven to close in all clock periods.
  • the total duty cycle of the controllable switching element during the clock period then changes as little as the average brightness of the LEDs in series with the controllable switching element.
  • the pulse durations during which the remaining controllable switching elements are closed during the same clock period are also unaffected by the diagnosis time. Because of the diagnostic time, if necessary, the beginning or the end of the pulse durations for the activation of the other controllable switching elements must be shifted from clock period to clock period.
  • pulse durations during which the controllable switching elements are switched on within one clock period can be shifted to one another such that several or all controllable switching elements are switched on during a diagnostic time within the clock period alone, it is possible to use several or all light emitting diodes of the light emitting diode array with respect to to investigate one of the described failures.
  • a pulse duration must be shared, so that one of the controllable switching elements is turned on for two periods during a clock period, these periods together forming the pulse duration.
  • the diagnostic time can be at the beginning of the pulse duration and after the expiry of the diagnostic time, other controllable switching elements can be controlled to close.
  • the diagnosis time may be at the beginning of a clock period.
  • the diagnostic time can be 50 ⁇ s. But longer or shorter diagnosis times are possible.
  • the diagnostic time may be the same or different in duration from clock period to clock period.
  • the circuit arrangement can have a voltage sensor with which the voltage across the light-emitting diode field is detected during the diagnosis time.
  • the voltage across the LED field varies depending on the characteristics the light emitting diode and the closed controllable switching element, which is why it can be concluded from the measured voltage on the functionality of the light emitting diode.
  • the voltage detected during the diagnosis time over the light-emitting diode array can be compared by the control and / or regulating means with a predetermined value. Upon exceeding the predetermined value plus a predetermined tolerance by the detected voltage, the controllable switching element, which was closed during the detection during the diagnosis time, permanently, i. also be switched off for the following clock periods. The precipitated by an interruption of the current path through the series connection LED is then permanently switched off.
  • the controllable switching element which was closed during the detection during the diagnosis time, can be permanently switched off. At a small or compared to small voltage across the light emitting diode array or the only switched series connection can be concluded that a short circuit of the LEDs, which is why the permanent shutdown makes sense.
  • the pulse durations during which the remaining controllable switching elements are closed can be extended and / or the current of the switched-off series circuit can be distributed to the remaining series circuits.
  • the average brightness of the still functioning light-emitting diodes is increased, the average brightness of the entire circuit can u. U. despite the permanently disconnected light emitting diode or LEDs are maintained. It should be noted, however, that the thermal and electrical load capacity of the LEDs or controllable switching elements that are not switched off permanently, is not exceeded.
  • the in the FIG. 1 Circuit arrangement shown comprises a light-emitting diode array of three series circuits D1, R1, S1, D2, R2, S2, D3, R3, S3.
  • Each series circuit 1, 2, 3 comprises a light-emitting diode D1, D2, D3, a resistor R1, R2, R3 and a switch S1, S2, S3.
  • the following will be spoken of the first series circuit 1, the second series circuit 2 and the third series circuit 3.
  • the series circuits 1, 2, 3 are connected in parallel.
  • the light-emitting diodes D1, D2, D3 are arranged within the series circuits so that their anodes abut against a common node.
  • the controllable switching elements S1, S2, S3 also have a common node.
  • the resistors R1, R2, R3 are arranged between the diodes D1, D2, D3 and the controllable switching elements S1, S2, S3.
  • the circuit arrangement comprises a current source I, which is connected upstream of the anode-side node.
  • the current source I is a controllable current source.
  • a parallel circuit Downstream of the switch element-side node is a parallel circuit, are arranged in the measuring resistors.
  • a controllable switching element S4 is arranged in a first branch of the parallel circuit.
  • the controllable switching element is advantageously a transistor whose emitter collector path forms a first measuring resistor and thus the measuring resistor of the first branch of the parallel circuit.
  • a measuring resistor R4 is arranged in a second branch.
  • a measuring resistor R4 is arranged in a third branch.
  • a third branch is a series circuit of a measuring resistor R5 and a controllable switching element S5 arranged.
  • the parallel circuit is connected via ground to the current source I.
  • a voltage sensor V1 and a current sensor V2 is provided.
  • the voltage sensor V1 detects the voltage between the anode-side node and the ground potential.
  • the current sensor V2 detects the current through the light-emitting diode array via the detour of measuring the voltage which drops across the parallel connection of the measuring resistors.
  • control and / or regulating means C is provided in the circuit arrangement.
  • the control and / or regulating means C has several inputs and several outputs. About these inputs and outputs is the control and / or regulating means C with the controllable current source I, the controllable switching elements S1, S2, S3 of the LED array, the controllable switching elements S4, S5, the parallel connection of the measuring resistors, the voltage sensor V1 and the current sensor V2 connected.
  • connections between the components or components and the inputs or outputs of the control and / or regulating means are produced as follows:
  • a first input of the control and / or regulating means C is connected to the current sensor V2. Via the first input E1, the control and / or regulating means C can be supplied with the current intensity detected by the current sensor V2 or with an equivalent voltage thereto.
  • a second input E2 of the control and / or regulating means is connected to the voltage sensor V1. Via this input E2, a signal can be supplied to the control and / or regulating means which indicates the voltage between the a-node-side node and the ground potential.
  • First outputs A11, A12, A13 of the control and / or regulating means are connected to control terminals of the controllable switching elements S1, S2, S3 of the series circuits 1, 2, 3 of the LED array connected. Control pulses can be applied to the switching elements via these first outputs A11, A12, A13 in order to close them.
  • a second output A2 is connected to the controllable current source I. Via this second output A2, a signal can be given by the control and / or regulating means to the controllable current source I in order to set the current supplied by the current source I.
  • the control and / or regulating means which may be a microcontroller or an ASIC, is set up such that the light-emitting diodes D1, D2, D3 have a desired brightness.
  • the current source is adjusted by the control and / or regulating means C so as to provide a current sufficiently large enough to supply power to the series circuit whose LED has the highest forward voltage. This is, for example, the light emitting diode D3 in the third series circuit 3.
  • the current supplied by the controllable current source I divides at the anode-side node into the respective currents which flow through the series circuits 1, 2, 3.
  • the current distribution depends on the components of the series circuits 1, 2, 3. Among these components are also the LEDs D1, D2, D3 with their different forward voltages.
  • the currents are distributed in such a way that the series connection with the light-emitting diode with the lowest forward voltage, ie the first series connection, carries the largest current, while the series connection with the light-emitting diode D3 with the largest forward voltage, namely the third series circuit 3, leads the lowest current.
  • the current of the controllable current source I must be set such that the current necessary for providing the desired brightness flows through the third series circuit 3 and thus through the third light-emitting diode D3.
  • the controllable switching element S3 is turned on in the third series circuit 3 for a pulse duration T3.
  • the controllable switches S1, S2 of the first and the second series circuit 1, 2 are switched on for pulse durations T1, T2, the pulse duration T2 being smaller than the pulse duration T3 and the pulse duration T1 being smaller than the pulse duration T2.
  • the pulse durations T1, T2, T3 are chosen so that on average of the clock periods T, a current flows through the series circuit 1, 2, 3, which supplies on average the desired brightness of the light-emitting diodes.
  • the controllable current source I is controlled in such a way that at the end of the respective pulse durations T1, T2, T3 the current supply Iges of the controllable current source I is reduced by the current consumption of the series connection switched off at the end of the pulse duration T1, T2, T3.
  • the controllable current source I supplies exactly the current Iges, which is necessary for the supply of the switched series circuits.
  • diagnosis time Tdiag a period is provided, which is referred to as diagnosis time Tdiag.
  • diagnosis time Tdiag a period is provided, which is referred to as diagnosis time Tdiag.
  • the controllable switching element which was turned on during the diagnostic time Tdiag, during which the deviation was detected, permanently switched off.

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  • Led Devices (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Control Of El Displays (AREA)
  • Traffic Control Systems (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Electronic Switches (AREA)

Claims (12)

  1. Procédé pour actionner un agencement de circuit
    - avec une source de courant (I),
    - avec un champ à diodes électroluminescentes (1, 2, 3) montées en série par rapport à la source de courant (I), le champ à diodes électroluminescentes (1, 2, 3) comprenant au moins deux montages en série (1, 2, 3) qui comprennent au moins une diode électroluminescente (D1, D2, D3) et un élément de commutation commandable (S1, S2, S3),
    - avec un moyen de commande et/ou de réglage (C) pour le champ à diodes électroluminescentes (1, 2, 3), et
    - avec un capteur de tension (V1),
    les éléments de commutation commandables et la source de courant (I) étant commandés par le moyen de commande et/ou de réglage (C), et ce de telle manière
    - que le moyen de commande et/ou de réglage (C) commande l'élément de commutation commandable (S1, S2, S3) d'au moins un montage en série (1, 2, 3) du champ à diodes électroluminescentes (1, 2, 3) pour qu'il se ferme, pendant une période d'horloge (Tcycle) pour une durée d'impulsion (T1, T2, T3) déterminée par le moyen de commande et/ou de réglage (C), par le biais d'une impulsion de commande à l'entrée de commande de l'élément de commutation commandable (S1, S2, S3) et
    - que pendant des périodes d'horloge (Tcycle) successives du moyen de commande et de réglage (C), un des éléments de commutation commandables des montages en série (1, 2, 3) est commandé uniquement pour se fermer pendant une durée désignée en tant que temps de diagnostic (Tdiag),
    caractérisé en ce que
    - le moyen de commande et/ou de réglage (C) commande la source de courant (I) peu avant ou au plus tard au moment même où s'arrête une durée d'impulsion (T1, T2, T3), de sorte que le courant soit réduit, et ce de la valeur du courant à travers le montage en série (1, 2, 3), dont l'élément de commutation commandable (S1, S2, S3) est commandé pour être ouvert par le moyen de commande et/ou de réglage (C) à la fin de la durée d'impulsion (T1, T2, T3),
  2. Procédé selon la revendication 1, caractérisé en ce que pour un nombre de n montages en série dans n périodes d'horloge (Tcycle) successives, chaque élément de commutation commandable (S1, S2, S3) est commuté pour se fermer pendant le temps de diagnostic (Tdiag).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le temps de diagnostic pendant lequel un élément de commutation commandable (S1, S2, S3) est commuté pour se fermer, fait partie de la durée d'impulsion (T1, T2, T3) pendant laquelle le même élément de commutation (S1, S2, S3) est commuté pour se fermer dans toutes les périodes d'horloge (Tcycle).
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le temps de diagnostic (Tdiag) est situé au début de la durée d'impulsion (T1, T2, T3) et après l'expiration du temps de diagnostic (Tdiag) également tout autre élément de commutation commandable (S1, S2, S3) peut être commandé pour se fermer.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que le temps de diagnostic (Tdiag) est situé au début d'une période d'horloge (Tcycle).
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que le temps de diagnostic (Tdiag) s'élève à 50 µs.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que l'agencement de circuit présente un capteur de tension (V1) avec lequel la tension sur le champ à diodes électroluminescentes (1, 2, 3) est saisie pendant le temps de diagnostic (Tdiag).
  8. Procédé selon la revendication 7, caractérisé en ce que la tension saisie sur le champ à diodes électroluminescentes pendant le temps de diagnostic est comparée avec une valeur prédéterminée par le moyen de commande et/ou de réglage (C).
  9. Procédé selon la revendication 8, caractérisé en ce que lors d'un dépassement de la valeur prédéterminée, augmentée d'une valeur de tolérance prédéterminée par la tension saisie, l'élément de commutation commandable (S1, S2, S3) qui a été fermé pendant la saisie pendant le temps de diagnostic (Tdiag), est déconnecté en permanence, c'est-à-dire même pour les périodes d'horloge (Tcycle) qui suivent.
  10. Procédé selon la revendication 8 ou 9, caractérisé en ce que lors d'un sous-dépassement de la valeur prédéterminée, réduite d'une valeur de tolérance par la tension saisie, l'élément de commutation commandable (S1, S2, S3) qui a été fermé pendant la saisie pendant le temps de diagnostic (Tdiag) est déconnecté en permanence.
  11. Procédé selon la revendication 9 ou 10, caractérisé en ce qu'après une déconnexion permanente par le moyen de commande et/ou de réglage (C), les durées d'impulsion (T1, T2, T3) sont prolongées pendant lesquelles les éléments de commutation commandables (S1, S2, S3) restants sont fermés.
  12. Moyen de commande et/ou de réglage (C) pour un champ à diodes électroluminescentes (1, 2, 3) avec au moins deux premières sorties (A11, A12, A13) sur lesquelles des signaux de commande peuvent être prélevés pour commander des éléments de commutation commandables (S1, S2, S3) du champ à diodes électroluminescentes (1, 2, 3) et
    avec une entrée de signal de mesure (E2) sur laquelle un signal de capteur d'un capteur de tension (V1) peut être appliqué,
    caractérisé en ce que
    le moyen de commande et/ou de réglage (C) est approprié et configuré à réaliser un procédé selon l'une des revendications 1 à 11.
EP13702013.7A 2012-02-21 2013-01-28 Procédé permettant de faire fonctionner un circuit pour un réseau de diodes électroluminescentes alimentées en courant constant, avec détection d'erreurs Active EP2818027B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012101363A DE102012101363A1 (de) 2012-02-21 2012-02-21 Verfahren zum Betreiben einer Schaltungsanordnung mit einem Steuer- und/oder Regelungsmittel für ein Leuchtdiodenfeld
PCT/EP2013/051534 WO2013124120A1 (fr) 2012-02-21 2013-01-28 Procédé permettant de faire fonctionner un circuit pour un réseau de diodes électroluminescentes alimentées en courant constant, avec détection d'erreurs

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Publication Number Publication Date
EP2818027A1 EP2818027A1 (fr) 2014-12-31
EP2818027B1 true EP2818027B1 (fr) 2016-06-29

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US (1) US9295118B2 (fr)
EP (1) EP2818027B1 (fr)
CN (1) CN103472444B (fr)
DE (1) DE102012101363A1 (fr)
WO (1) WO2013124120A1 (fr)

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Publication number Publication date
CN103472444A (zh) 2013-12-25
EP2818027A1 (fr) 2014-12-31
CN103472444B (zh) 2017-09-15
DE102012101363A1 (de) 2013-08-22
US9295118B2 (en) 2016-03-22
US20150022112A1 (en) 2015-01-22
WO2013124120A1 (fr) 2013-08-29

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