EP2584870B1 - Lampe à LED à intensité variable - Google Patents

Lampe à LED à intensité variable Download PDF

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Publication number
EP2584870B1
EP2584870B1 EP12189177.4A EP12189177A EP2584870B1 EP 2584870 B1 EP2584870 B1 EP 2584870B1 EP 12189177 A EP12189177 A EP 12189177A EP 2584870 B1 EP2584870 B1 EP 2584870B1
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EP
European Patent Office
Prior art keywords
leds
led lamp
operating mode
sub
groups
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.)
Active
Application number
EP12189177.4A
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German (de)
English (en)
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EP2584870A1 (fr
Inventor
Bernd Clauss
Thomas Kottek
Matthias Menke
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.)
Zumtobel Lighting GmbH Austria
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Zumtobel Lighting GmbH Austria
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • 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 an LED lamp (LED: light emitting diode), in particular an LED spotlight, with at least three LEDs, each of the LEDs is designed to emit a light with the same spectral property, as well as with a control unit for controlling the LEDs. Moreover, the invention relates to a method for controlling such an LED light.
  • LED lamp light emitting diode
  • LED spotlight with at least three LEDs, each of the LEDs is designed to emit a light with the same spectral property, as well as with a control unit for controlling the LEDs.
  • the invention relates to a method for controlling such an LED light.
  • a known such LED light can be adjusted by means of pulse width modulation (PWM) in their brightness.
  • PWM pulse width modulation
  • the LEDs are switched on and off in very short time intervals so that "on times” and “off times” result for the LEDs. These time intervals are so short that under normal circumstances no corresponding brightness fluctuations are perceived by a human observer.
  • the luminaire comprises a plurality of groups of LEDs, wherein more or fewer LED groups can be switched on to change the brightness.
  • the invention has for its object to provide a corresponding improved LED light;
  • the LED light should be better suited for lighting when shooting movies.
  • an improved method for controlling a corresponding LED light to be specified.
  • the LED luminaire in particular a LED spotlight provided having or the LEDs in a total number N for light emission in an external space of the LED lamp, where N ⁇ 3 applies and wherein each of N LEDs designed the total to is to emit a light with the same spectral property.
  • the LED lamp has a control unit for controlling the LEDs; the control unit is designed to set the luminaire optionally in one of a plurality of different operating modes, wherein in each of the different operating modes a respective different part number n of the total of N LEDs, with 0 ⁇ n ⁇ N , and the respective remaining N - n LEDs are turned off.
  • control unit is further configured to put the LED light in one of the different modes depending on a predetermined dimming value. This allows easier adjustment of the brightness.
  • At least one of the N LEDs is turned on and at least one other of the N LEDs is off, with the following:
  • the control unit is further configured to selectively switch on one of a plurality of different sub-groups of in each case j LEDs of the total of N LEDs in order to place the LED light in the operating mode in question.
  • This preferably applies to any operating mode in which at least one of the LEDs is switched on and at least one of the LEDs is switched off. In this way, a certain level of brightness can be achieved by switching on different subgroups of the LEDs, which can reduce the turn-on of the individual LEDs to achieve the relevant brightness level, so that overall the life of the LED lamp can be extended.
  • the configuration is preferably such that the different subgroups do not overlap, so that each of the total of N LEDs can only be part of one of the different subgroups.
  • a simplified design of the control unit is made possible in particular.
  • control unit is further configured to determine which of the subgroups is turned on to place the LED light in the mode of operation considered. This makes it easier to operate the LED light.
  • the LED light further comprises a detection unit which is adapted to continuously detect for each of the subgroups a respective current value, which represents a summed up over a certain period duty cycle of the respective subgroup; As a period, for example, the operating time of the LED light can be selected. On the basis of these values, that subgroup can be determined and set for activation - ie for switching on the corresponding LEDs - which has the shortest switch-on duration so far. This can extend the life of the LED lamp overall.
  • control unit is further configured to determine, depending on the values that have been previously detected by the detection unit, which of the subgroups is turned on in order to put the LED light in the operating mode under consideration. With “switching on a subgroup”, of course, a switching on of the LEDs of the relevant subgroup is indicated.
  • the one of the subgroups whose value represents the shortest duty cycle or, if appropriate, one of the subgroups whose values represent the shortest turn-on durations is determined. The latter makes sense if at least two of several possible subgroups have the same shortest value.
  • the LED light is configured in such a way that, when the operating mode changes from a current operating mode to a subsequent operating mode, the subgroups of the current operating mode and the subgroups of the subsequent operating mode can be superimposed by control by the control unit, for which purpose a corresponding operating current is varied. This avoids that the change between the two operating modes appears "jerky".
  • a particularly simple design of the LED light is possible if all N LEDs have the same power.
  • in particular structurally identical LEDs can be used.
  • all N LEDs are arranged on a circuit board.
  • the total number N of LEDs may be at least 25, so that the following applies: N ⁇ 25.
  • N ⁇ 25 This makes it possible, for example, to realize a square field for emitting light with a matrix-type arrangement of 5 ⁇ 5 LEDs. Even more preferred is the total number N ⁇ 49.
  • the larger N is selected, the more different operating modes and thus brightness levels can be realized with the LED lamp.
  • LED light in the form of an LED spotlight for movie lighting in interiors due to the above-mentioned relationships.
  • a method for driving an LED luminaire comprising the following steps: (a) input of the dimming value into the control unit, (b) assignment of one of the operating modes to that in step (a) (d) optionally selecting one of a plurality of possible subgroups of LEDs that can be switched on to the operating mode assigned in step (b), using as a selection criterion the current values that have been previously acquired by the detection unit and (d) in a change of the mode of operation from a current mode to a subsequent mode, the subgroups of the current mode and subgroups of the subsequent mode are superimposed by a control by the control unit, for which a corresponding operating current is varied.
  • Fig. 1 is a schematic diagram of an LED lamp according to the embodiment shown.
  • the LED lamp has LEDs 2, the total number of which is generally designated N here. In this case, N ⁇ 3, so there are at least three LEDs 2 are provided.
  • the LEDs 2 are designed to emit light in an outer space of the LED light and arranged in the LED light.
  • the LED light may be, for example, an LED spotlight, in particular an LED spotlight for indoor movie lighting.
  • the total of N LEDs are each designed to emit a light with the same spectral property.
  • all LEDs 2 have the same power.
  • all N LEDs can be identical LEDs.
  • the LEDs 2 may be formed, for example, for emitting white light.
  • the LED lamp has a control unit 6 for controlling the LEDs 2.
  • the control unit 6 is adapted to set the LED light either in one of several different modes B1 , B2 , ..., wherein in each of the different modes B1 , B2, ... a respective other part number n of the total N LEDs are switched on and the remaining N - n LEDs are switched off. In this case, 0 ⁇ n ⁇ N.
  • each of the total of N LEDs can either be switched on or off, ie in particular not dimmed. This makes it possible in particular to achieve a brightness adjustment for the LED lamp without PWM control.
  • the number of different operating modes or brightness levels is not limited to N + 2, because fewer operating modes or brightness levels can be provided.
  • N + 2 can be provided for the number of different operating modes B1 , B2, ... Or brightness levels.
  • control unit 6 is further adapted to put the LED light in one of the different modes B1 , B2, ... in dependence on a predetermined dimming value.
  • the control unit 6 can have a control interface 61 for this purpose.
  • a dimm value input by a user, analog or digital control signal via the control interface 61 is read;
  • the control interface 61 as a function of the number of provided brightness levels or modes, ie in the context of "Functional range" of the LED lamp, a corresponding number of different control signals or dimming values offered for selection.
  • the input control signal is subsequently interpreted in an interpretation unit 62 of the control unit 6 in order to assign one of the operating modes B1 , B2, ... To the control signal.
  • the control signal is occupied by a dimming curve.
  • one of the operating modes B1 , B2, ... Is assigned to the control signal which comes closest to the desired amount of light in accordance with the manipulated variable or, depending on the place of use, is generally rounded up or down.
  • At least one of the N LEDs is turned on and at least one other of the N LEDs is turned off, with the following:
  • the control unit 6 is further configured to optionally one of several different subgroups U1, U2, ... of each j LEDs of the total N LEDs turn on to the LED light in the considered mode Bj offset. This preferably applies to each of the operating modes B1 , B2, ..., In which at least one of the N LEDs is switched on and at least one is switched off.
  • the first operating mode B1 is sketched, in which all LEDs are switched off.
  • the second and the third operating mode three different possibilities of switched on and off LEDs are shown side by side.
  • this considered operating mode Bj at least one of the LEDs 2 is switched on and at least one of the LEDs 2 off.
  • Fig. 3 the first subgroup U1 is sketched in the second line on the left, in the middle the second subgroup U2 and on the right the third subgroup U3.
  • the control unit 6 can switch on the first subgroup U1 for the first time , the second subgroup U2 for the second time, and the third subgroup U3 for the third time.
  • the service life is at least approximated increase the LED light by a factor of three.
  • control unit 6 preferably has a subgroup assignment unit 63.
  • the different subgroups U1, U2, U3 are preferably "non-overlapping", which expresses that each of the total of nine LEDs can only be part of one of the different subgroups U1, U2, U3 .
  • each of the total of N LEDs is either only on or off, but not dimmed as such.
  • a particularly simple handling of the LED light is made possible when the control unit 6 is designed to "automatically" determine which of the subgroups U1, U2, U3 is turned on to the lamp in the second operating state B2 or in the considered operating state Bj to move. In this way it can be avoided that one of the subgroups U1, U2, U3 has to be selected manually for this purpose.
  • the LED light preferably also has a detection unit 8, which is designed to continuously record a respective current value for each of the subgroups U1, U2, U3 , one, over a certain period of time, for example the operating time of the LED light , accumulated duty cycle represents. This value can then be used by the control unit 6 as a suitable selection criterion in the selection or determination of one of the subgroups U1, U2, U3 .
  • the detection unit 8 is connected to the control unit 6, as in FIG Fig. 1 symbolically indicated by a double arrow 10.
  • the detection unit 8 preferably has a memory for storing the values.
  • the value may be an absolute time, any unit proportional to the duty cycle, or a corresponding ratio of the subgroups to each other.
  • control unit 6 may be designed to determine which of the subgroups U1, U2, U3 is turned on, depending on the values representing the switch-on periods and which have previously been detected by the detection unit 8, about the LED light in the second operating mode B2 or in the considered operating mode Bj .
  • control unit 6 is designed in such a way that that one of the subgroups U1, U2, U3 is determined or determined to be switched on, the value of which represents the shortest duty cycle, or optionally one of those subgroups U1, U2, U3 whose values are the shortest duty cycle represent.
  • the number of LEDs that are present in a subgroup basically any values assumed; In particular, a subgroup may already be formed by a single LED.
  • the control unit 6 is preferably designed to individually switch on and off or control each of the total of N LEDs.
  • That subgroup is selected, whose duty cycle is the shortest or one of those subgroups whose duty cycles are the shortest.
  • the LED light can continue to be designed such that in this change, if necessary, the subgroups of the current mode and the subgroups of the subsequent mode by a Control can be superimposed by the control unit 6, for which purpose a corresponding operating current is varied.
  • the control unit 6 may in particular have a crossfade unit 64 for each subgroup. This can be realized for example by means of software or by an analog module.
  • the output of the cross-fade unit 64 is an interface to a driver 12 of the LEDs 2; This driver 12 can be realized analog or digitized.

Claims (11)

  1. Luminaire à LED sous la forme d'un projecteur à LED pour l'éclairage d'un film dans des espaces intérieurs, comprenant
    - des LED (2) d'un nombre total de N, pour l'émission de lumière dans un espace extérieur au luminaire à LED, N ≥ 3 et chacune des N LED (2) étant conçue pour émettre une lumière avec la même propriété spectrale,
    - une unité de commande (6) pour la commande des LED (2),
    l'unité de commande (6) étant conçue pour mettre le luminaire à LED de manière sélective dans un ou plusieurs modes de fonctionnement différents (B1, B2, ...), moyennant quoi, dans chacun des différents modes de fonctionnement, un autre nombre partiel n des N LED (2) au total, avec 0 ≤ n ≤ N, sont allumées et les N-n LED (2) restantes sont éteintes,
    moyennant quoi, dans un mode de fonctionnement considéré (Bj) des différents modes de fonctionnement (B1, B2, ...), au moins une des N LED est allumée et au moins une autre des N LED est éteinte et ce qui suit s'applique :
    soit j exactement le nombre partiel des N LED au total qui sont allumées dans le mode de fonctionnement considéré (Bj), l'unité de commande (6) est conçue en outre pour allumer de manière sélective un parmi plusieurs sous-groupes (U1, U2, ...) des j LED des N LED au total, afin de mettre le luminaire à LED dans le mode de fonctionnement considéré (Bj),
    caractérisé en ce que
    le luminaire à LED est conçu de façon à ce que, lors d'une modification du mode de fonctionnement d'un mode de fonctionnement actuel à un mode de fonctionnement suivant, le cas échéant, les sous-groupes du mode de fonctionnement actuel et les sous-groupes du mode de fonctionnement suivant sont enchaînés à l'aide d'une commande par l'unité de commande (6), un courant de fonctionnement correspondant étant modifié pour cela.
  2. Luminaire à LED selon la revendication 1,
    dans lequel l'unité de commande (6) est conçue en outre pour mettre le luminaire à LED dans un des différents modes de fonctionnement (B1, B2, ...) en fonction d'une valeur de gradation prédéterminée.
  3. Luminaire à LED selon la revendication 1 ou 2,
    les différentes sous-groupes (U1, U2, ...) ne se chevauchant pas, de façon à ce que chacune des N LED au total puisse faire partie d'un seul des différents sous-groupes (U1, U2, ...).
  4. Luminaire à LED selon l'une des revendications précédentes,
    dans lequel l'unité de commande (6) est en outre conçue pour déterminer lequel des sous-groupes (U1, U2, ...) est allumé afin de mettre le luminaire à LED dans le mode de fonctionnement considéré (Bj).
  5. Luminaire à LED selon l'une des revendications précédentes,
    comprenant en outre
    - une unité de mesure (8) qui est conçue pour mesurer en continu, pour chacun des sous-groupes (U1, U2, ...), une valeur actuelle, qui représente une durée d'allumage cumulée sur une période déterminée du sous-groupe concerné, la période étant par exemple la durée de fonctionnement du luminaire à LED.
  6. Luminaire à LED avec les caractéristiques mentionnées dans les revendications 4 et 5,
    dans lequel l'unité de commande (6) est conçue en outre pour déterminer, en fonction des valeurs qui ont été mesurées par l'unité de mesure (8), lequel des sous-groupes (U1, U2, ...) est allumé, afin de mettre le luminaire à LED dans le mode de fonctionnement considéré (Bj).
  7. Luminaire à LED selon la revendication 6,
    celui des sous-groupes (U1, U2, ...) étant déterminé dont la valeur représente la durée d'allumage la plus courte ou le cas échéant un des sous-groupes (U1, U2, ...) étant déterminé dont les valeurs représentent les durées d'allumage les plus courtes.
  8. Luminaire à LED selon l'une des revendications précédentes,
    dans lequel les N LED (2) ont la même puissance.
  9. Luminaire à LED selon l'une des revendications précédentes,
    dans lequel les N LED (2) sont disposées sur un circuit imprimé (4).
  10. Luminaire à LED selon l'une des revendications précédentes,
    dans lequel N ≥ 25, de préférence N ≥ 49.
  11. Procédé de commande d'un luminaire à LED selon la revendication 7, comprenant les étapes suivantes :
    (a) saisie d'une valeur de gradation dans l'unité de commande (6),
    (b) attribution d'un des modes de fonctionnement à la valeur de gradation saisie à l'étape (a),
    (c) le cas échéant, sélection d'un parmi plusieurs sous-groupes possibles (U1, U2, ...) de LED, qui peuvent être allumés selon le mode de fonctionnement attribué à l'étape (b), le critère de sélection utilisé étant les valeurs actuelles qui ont été mesurées préalablement par l'unité de mesure (8) et qui représentent les durées d'allumage des sous-groupes (U1, U2, ...) et
    (d) lors d'une modification du mode de fonctionnement d'un mode de fonctionnement actuelle à un mode de fonctionnement suivant, les sous-groupes du mode de fonctionnement actuel et les sous-groupes du mode de fonctionnement suivant sont enchaînés à l'aide d'une commande par l'unité de commande (6), un courant de fonctionnement correspondant étant modifié pour cela.
EP12189177.4A 2011-10-21 2012-10-19 Lampe à LED à intensité variable Active EP2584870B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011084951A DE102011084951A1 (de) 2011-10-21 2011-10-21 LED-Leuchte mit einstellbarer Helligkeit

Publications (2)

Publication Number Publication Date
EP2584870A1 EP2584870A1 (fr) 2013-04-24
EP2584870B1 true EP2584870B1 (fr) 2017-12-13

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DE (1) DE102011084951A1 (fr)

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Publication number Priority date Publication date Assignee Title
KR20240033906A (ko) 2022-09-06 2024-03-13 현대모비스 주식회사 차량 시스템

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
DE19818621A1 (de) * 1998-04-25 1999-10-28 Mannesmann Vdo Ag Schaltungsanordnung zur Einstellung der Helligkeit stromgesteuerter Leuchtdioden zur Beleuchtung einer Anzeige
CA2336497A1 (fr) * 2000-12-20 2002-06-20 Daniel Chevalier Dispositif d'eclairage
DE102005024449A1 (de) * 2005-02-25 2006-09-07 Erco Leuchten Gmbh Leuchte
DE102005018175A1 (de) * 2005-04-19 2006-10-26 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH LED-Modul und LED-Beleuchtungseinrichtung mit mehreren LED-Modulen
ATE497687T1 (de) * 2006-10-27 2011-02-15 Airbus Operations Gmbh Lichtüberwachungssystem und verfahren zum betrieb eines solchen systems
US7560677B2 (en) * 2007-03-13 2009-07-14 Renaissance Lighting, Inc. Step-wise intensity control of a solid state lighting system

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EP2584870A1 (fr) 2013-04-24

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