EP2992734A1 - Procédé de modification de la localisation chromatique de la lumière visible émise par un module de del - Google Patents

Procédé de modification de la localisation chromatique de la lumière visible émise par un module de del

Info

Publication number
EP2992734A1
EP2992734A1 EP14724020.4A EP14724020A EP2992734A1 EP 2992734 A1 EP2992734 A1 EP 2992734A1 EP 14724020 A EP14724020 A EP 14724020A EP 2992734 A1 EP2992734 A1 EP 2992734A1
Authority
EP
European Patent Office
Prior art keywords
led
module
control module
dimming
color
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.)
Withdrawn
Application number
EP14724020.4A
Other languages
German (de)
English (en)
Inventor
Peter Pachler
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.)
Tridonic GmbH and Co KG
Original Assignee
Tridonic Jennersdorf GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tridonic Jennersdorf GmbH filed Critical Tridonic Jennersdorf GmbH
Publication of EP2992734A1 publication Critical patent/EP2992734A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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

Definitions

  • the invention relates to a method for changing the color locus of the visible light emitted by an LED module and to a control module which is designed to carry out the method according to the invention, and in particular to an LED module for operating at least two LED paths.
  • the control module can be supplied starting from a supply voltage (AC voltage / DC voltage) and, based on this, the at least two LED paths can each be operated with at least one LED.
  • the at least two LED sections and the LED module together with the control module form a unit, so that this unit is buildable in a lamp or light.
  • the aim of the invention is to provide a solution which makes it possible to dynamically and gradually change a color location or a color temperature of the light emitted by the LED paths.
  • the invention proposes to operate two basically identical white-light LEDs, which however have a different color temperature or a different emission spectrum, in parallel or alternately.
  • Both LED paths are preferably operated by means of a PWM modulation, wherein the control module is adapted to change a duty cycle of the PWM modulations.
  • the control module may separately change the on- time (T on- time) of the PWM signal for each of the LED links. This makes it possible to influence the switch-on duration of the LED circuits, the aim being to avoid a flickering of the LED circuits and thus the switch-on frequency, with which a PWM module controls the LED circuits, above the threshold of approx 80 Hz, preferably 100 Hz, as of which switching is no longer perceptible to the human eye.
  • the LED strips used preferably have different color temperatures, by changing the T on times of the LED strips, it is now possible to set any color temperature or any color location which lies between the color locations of the LED strips used.
  • This setting of the color locus can be further combined with a dimming function.
  • a relatively slow dimming PWM modulation are used whose duty cycle dictates a dimming value, i. a value to which the LED strips are to be dimmed.
  • a corresponding evaluation is carried out by the control module.
  • the color PWM modulation for the color temperature change can take place according to the invention. It can be provided that within the switch-on period of the dimming PWM pulse of the dimming PWM modulation of the dimming PWM pulse is divided into the at least two parallel LED links. This means that the switch-on duration of the dimming PWM pulse defines the maximum sum of the switch-on durations of the LED lines, the switch-on duration of the dimming PWM pulse is thus divided as the available total switch-on time duration for the LED paths. Alternatively or additionally, it can be provided that an entire dimming PWM pulse is used to control one of the two LED paths and then the duty cycle for changing the temperature value is changed by a variable number of dimming PWM pulses being applied to the other LED Route is switched.
  • the LED circuits can be supplied from different power sources, which can preferably provide as constant current sources supply currents of different heights for the LED circuits. Preferably, however, only one current source can be switched to the parallel LED paths.
  • the parallel operation includes alternating operation. The LED routes are therefore provided in parallel, but can be operated alternately.
  • colored LEDs can be connected in parallel, and by appropriate control of the LEDs, the color temperature / color location can be further changed, in particular, the area in which the color temperature can be changed can be increased.
  • white light is preferably always generated, wherein, if further colored (eg red, green, blue) LED paths are provided in parallel, the color rendering index is color-coded by the color PWM modulation of the duty cycle of the resulting white mixed light can be improved.
  • further colored (eg red, green, blue) LED paths are provided in parallel, the color rendering index is color-coded by the color PWM modulation of the duty cycle of the resulting white mixed light can be improved.
  • a first LED track e.g. a 'cold' light (e.g., 3300K to 5300K, especially 4000K, preferably over 5300K, e.g., 6500K) and a second LED path, e.g. 'Warm' light emits (for example, under 3000K to 3300K), and which represent the white light path, so also a duty cycle between the colored LED tracks or a red and a green LED track is changed accordingly.
  • a 'cold' light e.g., 3300K to 5300K, especially 4000K, preferably over 5300K, e.g., 6500K
  • a second LED path e.g. 'Warm' light emits (for example, under 3000K to 3300K)
  • a duty cycle between the colored LED tracks or a red and a green LED track is changed accordingly.
  • the invention provides an apparatus and a method as claimed in the independent claims. Further developments of the invention are the subject of the dependent claims.
  • the invention provides a method of changing the color location of the visible light emitted by an LED module, the LED module having at least two parallel LED paths, each having at least one LED, the emission spectrum of the LED Different routes, and wherein the LED routes are operated alternately with constant current, and color change for changing the ratio of the turn-on periods of the LED routes, preferably while keeping constant the sum of the turn-on time durations of all LED routes.
  • the sum of the switch-on durations of all LED sections can be predetermined by a dimming signal.
  • the dimming signal may be evaluated by the control module such that the dimming signal sets an upper limit of a total turn-on duration of all the LED paths.
  • the turn-on durations of the LED paths may be adjusted depending on a color temperature change signal.
  • the LED routes can be white light LED routes.
  • the LED routes can have different color temperatures.
  • At least one of the LED circuits can, preferably exclusively, have red, green and / or blue LEDs.
  • the LED sections can be supplied with constant currents of different heights, in particular starting from different current sources.
  • the LED links can be powered from a single power source.
  • the LED sections can be switched on and off alternately by means of a switching element. It is not necessary at all times to activate or activate one of the LED circuits. So it may happen that all or individual LED routes are at least temporarily disabled.
  • the switch-on time duration of the LED paths can be changed relative to one another, in particular the switch-on time duration of one LED route can be shortened / lengthened and (indirectly) proportional to this the switch-on time duration of another LED route can be lengthened / shortened.
  • the LED strips can be mounted on an LED module.
  • the invention provides a control module configured to perform a method as described above.
  • the invention provides a control module having at least one input to which a dimming and / or color temperature change signal can be supplied and having at least one output from which at least two LED paths are operable, the control module being adapted thereto to evaluate a dimming and / or Farbtemperatur Sungssignal supplied to him and depends at least on the
  • Color temperature change signal to change a color location of the emitted light from an LED module visible light the LED module has at least two parallel LED stretches, each having at least one LED, wherein the emission spectrum of the LED routes differs, and wherein the control module to is designed to operate the LED sections alternately with constant current, and for color change the ratio of the Einschaltzeitdauern to change the LED routes, preferably while keeping constant the sum of the switch-on of all LED routes.
  • the control module can be designed as a ballast module for an LED module and in particular be designed to control a switch of the LED module in response to the dimming signal and / or the color temperature change signal or supply the converter module with a signal to be selected by the LED module setting displays.
  • the control module may be attached to the LED module.
  • the invention provides an LED module or luminaire having a control module as described above.
  • Fig. 1 is a tolerance diagram for mixing with respect to a MacAdam 1 ellipse.
  • Fig. 2 is a control of two LED lines without
  • Fig. 3 is a control of two LED routes with dimming.
  • Fig. 4 schematically shows a circuit construction.
  • Fig. 5 is a control of two LED routes with dimming.
  • FIG. 1 is a diagram illustrating the requirements for accurately driving the LED traces to allow tolerance requirements for a MacAdam 1 ellipse over the entire dimming range (MAI Tolerance Influence Elipse, 6500K to 2700K blend).
  • a dimming value of 1% means, in particular, a dimming to 1% of the light output that is emitted without dimming.
  • the invention now provides, in particular, two different supply currents for two LED paths with different color temperatures.
  • Fig. 2 is shown the current at a dimming value of 100% (behavior at a dimming value of 100% at c.a 4000K, see 100% steps of the pulses [%]), i. at full power without dimming, switching back and forth between the LED circuits.
  • the LED sections are supplied with supply currents of different heights. Thus, one LED track is operated with a supply current of 100% (black curve), while another LED track is operated with a current of approx. 130% (gray curve).
  • a (relative) current change between the LED links can be used to keep the luminous flux at a level, while using formulas (1) it is determined when an LED track is turned on (see parameter k).
  • the same supply current could be used for both LED routes.
  • the current required to produce a constant luminous flux can be calculated. These calculations may be performed in the control module, e.g. through an IC, ASIC, or a microcontroller.
  • a ratio is defined in which the LED sections are to be switched on / off.
  • a situation as shown in Fig. 3 is exhibited (behavior at a dimming value of 5% at about 4000K; Pulse width of about 5% on the pulse [%] axis).
  • the turn-on time of the currents for the LED paths is very short. For this reason, driving the LED lines must be very precise in order to obtain a specific color value / color location or a specific color temperature, especially if the LED lines are supplied from different current sources.
  • the switch-on durations with which the LED lines are driven are to be changed relative to one another. If, for example, the switch-on time duration of the supply current for an LED route is extended, the turn-on time duration of the supply current of another LED route is simultaneously shortened. This results in a change in the color temperature.
  • the LED circuits are each operated alternately, there is in principle no requirement to provide two power sources. In particular, not at a dimming value of 100%.
  • the switching element may be provided to switch the current path over the parallel LED paths from one LED track to another LED track.
  • a change in the circuit that is to say a plurality of switches, must accordingly be provided.
  • the switching frequency of the switching element sets the color temperature, while the luminous flux is adjusted by means of the supply current. At the same luminous flux of the LED sections no change is necessary. If you want to dimming down to lower luminous fluxes, you must first determine the switch-on duration of the dimming PWM signal by the controller module. If only brightness dimming is to take place, in order to keep the color temperature / color location constant, the switch-on durations for the channels must be adjusted relative to the switch-on duration of the dimming signal, as shown in FIG.
  • one LED path within the dimming PWM signal is supplied with the supply current for two switch-on durations (pulses), while the other LED route is supplied with the supply flow for only one switch-on period (pulse).
  • the color temperature of the emitted light can be kept constant, while only the brightness is changed.
  • the turn-on durations of the LED paths relative to one another must be changed and, in particular, the turn-on time duration of the supply current of one LED path longer or shorter in relation to the turn-on time duration of the supply current of the other LED path.
  • the control module according to the invention can also be provided as a ballast module for an LED module.
  • the control module can receive a dimming signal, for example via a DALI bus, and calculate which switch-on time duration of the supply current for the LED paths must be selected in order to set a corresponding brightness value.
  • control module may calculate how to activate the LED paths, with dimming within the on-time of the dimming PWM signal, to set a color temperature.
  • control module can thus receive a signal indicating a desired color temperature change relative or absolute.
  • Fig. 6 shows schematically the operation of the control module, the control module SM1 shown in Fig. 6 above a PWM signal PWM-ON, in particular a Dimming PWM signal is supplied.
  • the control module SM1 is now configured to evaluate the supplied PWM signal PWM-ON.
  • the control module SM1 then outputs PWM signals PWM-OFF LED1 and PWM-OFF LED2, which can either be used directly for controlling the LED paths or can be evaluated by a converter or LED module.
  • This output signal PWM-OFF can be either directly to drive the LED links, e.g. via at least one switching element, used, or be evaluated by a converter or LED module.
  • the dashed lines on the output sides of the control modules SM1 and SM2 indicate that the ON periods of the output signals move within the ON period of the PWM signal PWM-ON.

Landscapes

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

Abstract

L'invention concerne un procédé de modification de la localisation chromatique de la lumière visible émise par un module de diodes électroluminescentes (DEL). Le module de DEL comporte au moins deux lignes de DEL parallèles qui comprennent chacune au moins une DEL, chaque spectre d'émission d'une ligne de DEL étant différent d'un autre spectre de ligne de DEL. Les lignes de DEL fonctionnent en alternance avec du courant constant, et le rapport des durées de mise sous tension des lignes de DEL est modifié pour modifier la localisation chromatique, de préférence en maintenant constante la somme des durées de mise sous tension de toutes les lignes de DEL.
EP14724020.4A 2013-04-30 2014-04-29 Procédé de modification de la localisation chromatique de la lumière visible émise par un module de del Withdrawn EP2992734A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013207961.3A DE102013207961A1 (de) 2013-04-30 2013-04-30 Verfahren zur Änderung des Farborts des von einem LED-Modul emittierten sichtbaren Lichts
PCT/EP2014/058675 WO2014177535A1 (fr) 2013-04-30 2014-04-29 Procédé de modification de la localisation chromatique de la lumière visible émise par un module de del

Publications (1)

Publication Number Publication Date
EP2992734A1 true EP2992734A1 (fr) 2016-03-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14724020.4A Withdrawn EP2992734A1 (fr) 2013-04-30 2014-04-29 Procédé de modification de la localisation chromatique de la lumière visible émise par un module de del

Country Status (3)

Country Link
EP (1) EP2992734A1 (fr)
DE (1) DE102013207961A1 (fr)
WO (1) WO2014177535A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2528695A (en) * 2014-07-29 2016-02-03 Integrated Design Ltd Turnstile indicator
US9538604B2 (en) * 2014-12-01 2017-01-03 Hubbell Incorporated Current splitter for LED lighting system
ES2912742T3 (es) * 2014-12-11 2022-05-27 Lumitech Patentverwertung Gmbh Procedimiento para el funcionamiento de una disposición configurada para emitir luz ajustable en su luminosidad y/o su localización del color
DE102017113013B4 (de) 2017-06-13 2022-08-25 Vossloh-Schwabe Deutschland Gmbh Betriebsgerät und Verfahren zum Betreiben eines Betriebsgeräts
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

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2523534A2 (fr) * 2011-05-12 2012-11-14 Ledengin, Inc. Appareil et procédés de réglage d'émetteur avec plusieurs DEL pour corbeille à couleur unique

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7902771B2 (en) * 2006-11-21 2011-03-08 Exclara, Inc. Time division modulation with average current regulation for independent control of arrays of light emitting diodes
US8410727B2 (en) * 2007-03-08 2013-04-02 Rohm Co., Ltd. LED lighting device and driving method for the same
TWI459858B (zh) * 2008-06-24 2014-11-01 Eldolab Holding Bv 照明系統及發光二極體組件之控制單元
CN102200247A (zh) * 2010-03-24 2011-09-28 富准精密工业(深圳)有限公司 发光二极管灯具
DE102010031589A1 (de) * 2010-07-21 2012-01-26 Osram Ag Betrieb parallel geschalteter Leuchtmodule

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2523534A2 (fr) * 2011-05-12 2012-11-14 Ledengin, Inc. Appareil et procédés de réglage d'émetteur avec plusieurs DEL pour corbeille à couleur unique

Also Published As

Publication number Publication date
DE102013207961A1 (de) 2014-10-30
WO2014177535A1 (fr) 2014-11-06

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