EP2019569B1 - Procédé d'atténuation de la luminosité rayonnée par des lampes à DEL, en particulier dans la cabine d'un avion commercial - Google Patents

Procédé d'atténuation de la luminosité rayonnée par des lampes à DEL, en particulier dans la cabine d'un avion commercial Download PDF

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Publication number
EP2019569B1
EP2019569B1 EP08011889.6A EP08011889A EP2019569B1 EP 2019569 B1 EP2019569 B1 EP 2019569B1 EP 08011889 A EP08011889 A EP 08011889A EP 2019569 B1 EP2019569 B1 EP 2019569B1
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EP
European Patent Office
Prior art keywords
current
periods
flow time
cycle
led
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.)
Ceased
Application number
EP08011889.6A
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German (de)
English (en)
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EP2019569A1 (fr
Inventor
Ulrich Pöhler
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Diehl Aerospace GmbH
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Diehl Aerospace GmbH
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Publication of EP2019569A1 publication Critical patent/EP2019569A1/fr
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Publication of EP2019569B1 publication Critical patent/EP2019569B1/fr
Ceased legal-status Critical Current
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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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter 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]
    • H05B45/20—Controlling the colour of the light

Definitions

  • the invention relates to a method according to the preamble of the main claim.
  • the gamut color correction required for high-quality, color-constant lighting effects requires very short current flow times via light-emitting diodes. It can then be compensated for that the color locations of LEDs vary within a production lot. In order to nevertheless achieve a certain basic color, the two other basic colors with low intensities are already used in the production adjustment or later in operation (regulated by photodiodes) admixed, which result for the respective color from the inscribed in the CIE standard color chart (in the so-called color shoe) color triangle for the LEDs. For example, a guaranteed color locus "blue, unsaturated" is gamut corrected by generating the green LED at 5% and the red LED at 2% in addition to the full drive (100%) of the blue LED.
  • blue has a turn-on time of 1% of the full cycle, ie 30 ⁇ s, for green 1% of 5% equal to 0, 05% (1.5 ⁇ s) and for red 1% of 2% equal to 0.02% (0.6 ⁇ s current flow over the red LED).
  • the present invention is based on the technical problem to further develop a method of the generic type that even with limited processor capacity and in conjunction with current sinks in inexpensive available, as conventional bipolar circuitry extremely low, i. light-dim dimming settings on LEDs can be set reproducibly and then also sensitively varied.
  • the currentless idle period in the (overall) cycle ie between two work periods spaced apart by an idle period, can in turn be varied to even finer-level dimming, for example by succession of a different number of idle periods of equal length and / or by length variations of the idle periods.
  • the pulse duration in the individual LED arrays can be set to temporarily constant cycle current integral so that no jump in the current integral, ie no brightness fluctuation and no abrupt color change, occur at this moment.
  • the length of the operating periods in which the current pulses of constant length occur can also be varied in the successive cycles in order to influence the radiation integral current integral over the cycle, without having to further shorten the current flow periods for further dimming down ,
  • Each array 12 is connected to a supply voltage 14 (of typically 55 volts) against device ground 15, to the latter via a constant current sink 16 in the form of a bipolar transistor in emitter circuit with its emitter resistor 17.
  • the length of these individual current flow periods t determines in each case via the cyclic current time integral the resulting array current intensity and thus the intensity (brightness) of the associated red, green and blue superimposed color emissions.
  • This current color mixture from the three arrays 12 gives the light color emitted by the luminaire 11.
  • the currently desired color mixture and its intensity is determined by a higher-level, external control signal 19 for the individual current flow periods t.
  • the current flow time t may be reduced stepwise within a period Ta, which is typically 3 milliseconds corresponding to a repetition frequency of 333 Hertz.
  • a period Ta typically 3 milliseconds corresponding to a repetition frequency of 333 Hertz.
  • the working period Ta must be correspondingly finely subdivided, the processor 18 thus having a correspondingly high coding depth for setting even very short time periods t, which makes it much more expensive.
  • Such a narrow-pulse control of the current sinks 16 would also become too high-frequency for the operation of constant-current transistors in the inexpensive bipolar technology.
  • a working period Ta switched when in at least one of the arrays of current flow t - especially for lack of processor-dependent finer resolution - should not be further reduced.
  • variable current flow periods tr, tg and tb occurring within the working periods Ta, T'a should be used as offset as possible from one another at the beginning of the period, around the middle of the period and before the end of the period.
  • Such interlacing avoids visually disturbing stroboscopic effects, such as may occur when colors are driven sequentially such that only one of the primary colors is always lit; or in general, when light is generated at very low frequency (substantially below 100 Hz).
  • a power supply 21 is fed with voltage converter 22 for providing the supply voltage 14.
  • a buffer 23 of high capacity (and not considered in the drawing voltage regulation) load changes are intercepted.
  • the energy stored in the buffer 23 is available when an LED is just turned on during the voltage zero crossing of the electrical system 20.
  • the buffer 23 is then until the next zero crossing of On-board network 20 recharged.
  • the buffer 23, typically an electrolytic capacitor must be sized quite large, which represents a significant cost factor.
  • the turn-on interleaving of the diodes reduces the stress on the power supply 21, so that a cheaper smaller buffer 23 can be used.
  • the first and then conventionally constant working period lengths Ta become different over the different arrays 12 adjustable current flow time periods tr, tg, tb - starting from the nominal current (typically around 25 mA) for maximum brightness - gradually reduced until in one of the arrays 12 a modulation (a dimming level) of typically only 1% of the normal brightness is reached.
  • the invention Before then occur in the array drive frequency components that can lead to about the frequency of the on-board network 20 about to beat phenomena, or if the coding depth of the current-controlling processor 18 and the response of the Konstantstromsenken 16 behind the LED arrays 12 further dimming by more Shortening of the current flow times t in any case no longer allow one of the arrays 12, according to the invention to further and more finely graded dimming an extension of the cycles Z by extending the working periods Ta and / or by inserting constant or variable lengths of no-current periods To between successive periods Ta, namely to further reduce the current integrals in the arrays 12 over the current cycle Z even without further shortening an already critically short current flow time t itself, if necessary, adjusting the current flow periods t to the desired Abstrahl-In intensity and color in the other arrays 12.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)

Claims (7)

  1. Procédé d'atténuation de la lumière rayonnée par des lampes à DEL (11), en particulier dans la cabine d'un avion commercial, par modification des intervalles de temps de passage de courant de DEL (t, tr, tg, tb) pendant des périodes de fonctionnement cycliques consécutives (Ta), dans lequel un cycle d'attaque (Z, Z') correspondant à des intervalles de temps de passage de courant (t, tr, tg, tb) pouvant être prédéterminés indépendamment les uns des autres à travers des réseaux de DEL (12) multicolores et donnés par les intervalles de temps (t, tr, tg, tb) du passage de courant respectif dans les réseaux de DEL (12), est soumis à une variation de sa longueur de cycle, dans lequel le cycle d'attaque (Z, Z') comprend une période de fonctionnement (Ta) comprenant les intervalles de temps de passage de courant (t, tr, tg, tb), dans
    lequel les intervalles de temps de passage de courant (t, tr, tg, tb) commencent de manière décalée temporellement les uns par rapport aux autres par rapport au début d'une période de fonctionnement (Ta), dans lequel l'intervalle de temps de passage de courant (t, tr, tg, tb) de l'un des réseaux de DEL (12) commence au début d'une période de fonctionnement (Ta) respective, l'intervalle de temps de passage de courant (t, tr, tg, tb) dans un réseau de DEL (12) d'une autre couleur se termine à la fin de la période de fonctionnement (Ta) respective, et dans lequel l'intervalle de temps de passage de courant (t, tr, tg, tb) dans un autre des réseaux de DEL (12) est disposé respectivement de manière symétrique dans le temps par rapport au milieu de la période de fonctionnement (Ta).
  2. Procédé selon la revendication précédente, dans
    lequel la longueur de cycle est amenée à varier lorsqu'au moins l'un des réseaux de DEL (12) n'est alimenté en courant que pendant un court intervalle de temps par rapport à la longueur des périodes de fonctionnement respectives.
  3. Procédé selon la revendication précédente, dans
    lequel la variation de la longueur de cycle commence lorsqu'un intervalle de temps de passage de courant (t, tr, tg, tb) le plus court possible du point de vue du matériel se produit dans au moins l'un des réseaux de DEL (12).
  4. Procédé selon l'une quelconque des revendications précédentes, dans lequel les longueurs des périodes de fonctionnement (Ta) lors desquelles les intervalles de temps de passage de courant (t, tr, tg, tb) se produisent, sont amenées à varier.
  5. Procédé selon au moins l'une quelconque des revendications précédentes, dans lequel la séquence des cycles (Z, Z') se compose respectivement de la succession d'une période de fonctionnement (Ta) avec passage de courant et d'au moins une période à vide (To) sans passage de courant.
  6. Procédé selon la revendication précédente, dans
    lequel les longueurs des périodes à vide (To) sont amenées à varier.
  7. Procédé selon l'une quelconque des revendications précédentes, dans lequel un basculement entre des longueurs de cycle différentes est respectivement effectué à la fin d'un cycle.
EP08011889.6A 2007-07-23 2008-07-02 Procédé d'atténuation de la luminosité rayonnée par des lampes à DEL, en particulier dans la cabine d'un avion commercial Ceased EP2019569B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007034177A DE102007034177B4 (de) 2007-07-23 2007-07-23 Verfahren zum Dimmen des von LED-Leuchten abgestrahlten Lichts, insbesondere in der Fluggastkabine eines Verkehrsflugzeuges

Publications (2)

Publication Number Publication Date
EP2019569A1 EP2019569A1 (fr) 2009-01-28
EP2019569B1 true EP2019569B1 (fr) 2017-03-08

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EP08011889.6A Ceased EP2019569B1 (fr) 2007-07-23 2008-07-02 Procédé d'atténuation de la luminosité rayonnée par des lampes à DEL, en particulier dans la cabine d'un avion commercial

Country Status (3)

Country Link
US (1) US8026677B2 (fr)
EP (1) EP2019569B1 (fr)
DE (1) DE102007034177B4 (fr)

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US8427075B2 (en) 2008-12-12 2013-04-23 Microchip Technology Incorporated Constant current output sink or source
DE102009027484A1 (de) 2009-07-06 2011-01-13 Osa Opto Light Gmbh Schaltungsanordnung zur Dimmung einer Leuchtquelle, die wengistens ein strahlungsemittierendes Halbleiterbauelement umfasst
DE102009040283A1 (de) * 2009-09-04 2011-03-10 Tridonic Ag Betrieb von pulsmodulierten LEDs
JP2011254285A (ja) * 2010-06-02 2011-12-15 Jamco Corp 航空機客室娯楽システム用可視光無線通信装置
SE1000801A2 (sv) 2010-07-29 2012-04-30 Andreas Vinnberg LED lampa
CN101945292A (zh) * 2010-09-16 2011-01-12 青岛海信电器股份有限公司 色域调整方法和装置
DE102010046795A1 (de) * 2010-09-28 2012-03-29 E:Cue Control Gmbh Verfahren zum Betrieb eines LED-Leuchtmittels mit mehreren LEDs, Steuereinheit für ein LED-Leuchtmittel mit mehreren LEDs und LED-Leuchtmittel
AT13736U1 (de) * 2011-10-27 2014-07-15 Tridonic Gmbh & Co Kg Pwm-dimmen von leuchtmitteln
DE102011122256A1 (de) * 2011-12-23 2013-06-27 Diehl Aerospace Gmbh Vorrichtung zur Steuerung einer Beleuchtungseinrichtung und Verfahren zur Steuerung einer Beleuchtungseinrichtung
KR101307467B1 (ko) * 2011-12-26 2013-09-11 주식회사 이지라인 순간 색상조명 감성공학 엘이디 조명장치
CN104078025B (zh) * 2013-03-25 2016-04-27 联想(北京)有限公司 一种色温控制方法及电子设备
WO2015195187A1 (fr) 2014-06-17 2015-12-23 Bae Systems Controls Inc. Lumière à del actionnée par ca à couleur et intensité numériquement commandée
CN106157878B (zh) * 2015-04-11 2019-08-20 上海艺霆灯具制造有限公司 一种三基色led控制驱动方法
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EP3726932B1 (fr) * 2019-04-17 2023-08-16 Lunatone Industrielle Elektronik GmbH Procédé de commande variable de fréquence de la couleur de lumière et / ou du flux de lumière d'un système d'éclairage
US11317486B2 (en) * 2020-03-19 2022-04-26 Apogee Lighting Holdings, Llc Color correction lighting control
DE102021117478B3 (de) 2021-06-30 2022-09-15 Elmos Semiconductor Se Individuelle PWM-Modulation für einen mehrkanaligen Leuchtmitteltreiber
CN121126637B (zh) * 2025-09-03 2026-04-21 广东富兴商超照明有限公司 超市ai照明调光方法及智能照明系统、装置、存储介质

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Publication number Publication date
EP2019569A1 (fr) 2009-01-28
DE102007034177A1 (de) 2009-02-05
US20090026976A1 (en) 2009-01-29
DE102007034177B4 (de) 2009-06-10
US8026677B2 (en) 2011-09-27

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