EP2901815B1 - Procédé et dispositif pour commander des del, avec une correction de température, au moyen de tables de consultation - Google Patents

Procédé et dispositif pour commander des del, avec une correction de température, au moyen de tables de consultation Download PDF

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Publication number
EP2901815B1
EP2901815B1 EP13788707.1A EP13788707A EP2901815B1 EP 2901815 B1 EP2901815 B1 EP 2901815B1 EP 13788707 A EP13788707 A EP 13788707A EP 2901815 B1 EP2901815 B1 EP 2901815B1
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EP
European Patent Office
Prior art keywords
led
operating current
circuit
look
stored
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Not-in-force
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EP13788707.1A
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German (de)
English (en)
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EP2901815A1 (fr
Inventor
Hans Hoschopf
Franz ZEROBIN
Thomas LEITGEB
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Tridonic Jennersdorf GmbH
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Tridonic Jennersdorf GmbH
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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]
    • H05B45/20—Controlling the colour of the light
    • H05B45/28—Controlling the colour of the light using temperature feedback

Definitions

  • the present invention generally relates to the generation of a light color by mixing the light of multiple light emitting diodes (LEDs). More specifically, the invention is directed to the generation of mixed light of a desired color and / or color temperature and to the control of LEDs to produce the light of the desired color or color temperature by mixing the light produced by the respective LEDs is to generate or receive.
  • LEDs light emitting diodes
  • Known LED arrays include a plurality of LEDs, for example, arranged according to the RGB (red-green-blue) color model. Such an LED array can thus comprise LEDs with three different colors, preferably red, green and blue, which emit at appropriate wavelengths. In particular, this known LED array can reproduce any color that is within the color triangle bounded by these three colors - red, green and blue - in a color value chart such as the CIE 1931 color space.
  • the DE 10 2008 016 756 A1 discloses a control arrangement for producing a desired light color based on different monochromatic LEDs.
  • the control arrangement is designed to control the various LEDs in such a way that the superimposition of the different spectra into light with predetermined desired color coordinates results in the values Xref, Yref, Zref, which is a desired color in the so-called CIE 1931 XYZ color space or CIE 1931 color space describe.
  • Such combination values X, Y and Z are also referred to as tristimulus values or standard color values of a color and indicate the measure of the three primary colors in the CIE 1931 color space.
  • an activation value for the different LED types is analytically determined with the tristimulus values via a matrix operation.
  • the whole is covered by the e.g. Three or four LED types spanned color space in the CIE color space converted into current and PWM signal via transformation and approximation formulas.
  • an object of the present invention is to improve the overall control of an LED array.
  • the aim of the invention is in particular to propose a clearer and more accurate achievement of a target color location.
  • a first aspect of the invention relates to a circuit for driving a plurality of LED channels, each comprising at least one LED, and for generating a mixed light from the light generated by the respective LED channels. For each target color location of the mixed light, which can be reached by the LED module, a look-up table is provided in each case, in which the operating current is stored for each LED channel.
  • Another aspect of the invention relates to a method for driving a plurality of LED channels, each having at least one LED, and for generating a mixed light from the light generated by the respective LED channels. For each target color location of the mixed light, which can be reached by the LED module, a look-up table is provided in each case, in which the operating current is stored for each LED channel.
  • the operating current can be stored as a function of the temperature.
  • Discrete values of an operating current / temperature characteristic can be stored for each LED channel.
  • the circuit may be designed to determine the respective operating current for the LED channels as a function of a measured temperature and based on the stored operating current / temperature characteristic.
  • the circuit may have a control unit which, depending on the look-up table, determines an injection value for a current source provided for operating an LED channel.
  • the control value can be designed such that a dimming to a constant current value and / or a PWM modulation of a nominal operating current can be carried out by the current source.
  • the circuit may have an input for measuring an ambient temperature, which input is preferably connected to a thermistor.
  • the circuit may have an input for a measurement signal of a brightness sensor, wherein, depending on the measured brightness, the respective operating current for each LED channel is corrected.
  • the respective operating current for each LED channel can be corrected.
  • the circuit may have a communication interface for receiving look-up tables and / or correction values.
  • the target color locus may be on the Plank curve or within a predetermined target area within the area spanned by the LEDs.
  • the circuit may include a plurality of look-up tables for driving discrete values on the Plank white light curve.
  • Different brightnesses of a target color location can be stored in look-up tables.
  • the circuit may be in the form of an integrated circuit, preferably in the form of a microcontroller, an ASIC or a hybrid version thereof.
  • Another aspect of the invention relates to an LED module comprising such a circuit.
  • Fig. 1 the reference numeral 1 generally shows an LED module according to a first embodiment of the present invention.
  • the LED module 1 comprises a circuit 2 for controlling LED channels K1, K2 or for controlling LEDs L1, L2.
  • the circuit 2 can be designed in the form of an integrated circuit, preferably as a microcontroller, ASIC or hybrid version thereof.
  • the circuit 2 includes a supply input 4 for supplying the circuit 2 with voltage. Furthermore, the circuit 2 includes outputs that can be connected with LED drivers T1, T2. These outputs are used to output control values or reference values for controlling the respective LED drivers T1, T2. Such a drive value is e.g. a voltage value which serves as a reference for the corresponding LED driver T1, T2.
  • the LED drivers T1, T2 are current sources which, on the output side, generate a current for the respective LED channel K1, K2 or for the respective LED L1, L2 as a function of the drive value supplied on the input side.
  • the LED drivers T1, T2 are preferably configured as a constant current source, so that when a constant drive value on the input side is applied, the current generated remains constant or at least almost constant.
  • the mixed light which is generated by the LEDs L1, L2 of the LED channels K1, K2, can be controlled in a targeted manner.
  • the control values By changing the control values, the color location and preferably also the intensity of the mixed light can be changed. In the case of a white mixed light, in particular the color temperature can be changed in a targeted manner.
  • each LED channel comprises LEDs of a single color.
  • the intensity maximum of all LEDs of an LED channel can then be in the same wavelength range, for example.
  • the first LED channel K1 may have monochromatic, eg red LEDs.
  • the second LED channel K2 can have white LEDs, in particular phosphor-converted blue LEDs. As a result, for example, a white mixed light can be generated.
  • the first LED channel may have different phosphor-converted white-emitting LEDs.
  • the second LED channel may have one or more blue LEDs.
  • Fig. 1 shows only one LED per LED channel K1, K2, several LEDs per LED channel can be provided according to the invention.
  • the number of LED channels is also variable, not two, as in Fig. 1 shown, limited.
  • three LED channels may be provided in the form of a red, a green and a blue LED channel having only red, green and blue LEDs. This combination also allows the production of a white mixed light. It can also be provided, for example, five LED channels. Thus, in a so-called. RGBWA LED module, the circuit 2 for driving LED channels with red, green, blue, white and amber LEDs are formed.
  • the circuit 2 preferably comprises a control unit 3, a memory unit 5 and digital-to-analog converter DA1, DA2.
  • a look-up table or look-up table is provided in each case, in which the characteristic curve light output / diode current for each LED channel K1, K2 and possibly also for different temperatures is stored.
  • a look-up table stored in the storage unit 5 is shown. This table defines which diode currents or operating currents Ir, Iw are necessary for the LED channels K1, K2 in order to produce a mixed light with the desired color temperature of eg 4200 K.
  • the memory unit 5 generally comprises a look-up table per color location or per color temperature, which is to be achieved with the aid of the LED module 1.
  • the circuit 2 is designed to control the LED drivers T1, T2 with drive values such that the LED channels K1, K2 are operated with the operating currents Ir, Iw defined in the look-up table.
  • the operating current Ir stored in the look-up table refers to the current for the LED channel K1 having red LEDs.
  • the information regarding the operating current Iw refers to the current with which the white LEDs of the LED channel K2 are to be operated.
  • control unit 3 can thus determine the respective drive value for the LED driver T1, T2 of each LED channel K1, K2.
  • the drive value can cause a linear dimming of the LED driver T1, T2 to the effect that the operating current generated by the LED driver is constant for the connected LED channel and is between zero and a nominal drive current.
  • the LED driver can be controlled by a pulse width modulation (PWM).
  • PWM pulse width modulation
  • the LED channel is then operated by a PWM modulated nominal drive current.
  • the drive value determined by the control unit 3 represents the PWM signal and in particular the duty cycle of the PWM signal.
  • the LED driver receives this drive value and generates the PWM modulated nominal drive current by modulating the nominal drive current with the PWM signal.
  • both PWM signals and constant current values can be generated in accordance with the linear dimming for the LED channels.
  • Different combinations of PWM dimming and amplitude dimming can be used in different areas of the dimming curve. Any spectral changes with the operating current of the LED are compensated by the look-up tables.
  • a combined operation of the LED channels via a combination of a PWM control is provided together with the linear dimming.
  • the control unit 3 can set a digital control value, which in turn is converted by the digital-to-analog converter DA1, DA2 into an analog control value.
  • the digital-to-analog converters DA1, DA2 are preferably designed as an integrated circuit.
  • only one value for the respective operating current Ir, Iw is stored for each color locus to be reached in the corresponding look-up table.
  • Advantage of this embodiment is that the operating currents Ir, Iw without much effort, i. only by reading the table, can be determined. However, the actually achieved color location may differ from the color location default, since the brightness of LEDs varies with temperature.
  • the value Ir, Iw of the operating current as a function of the temperature can be stored in the look-up table.
  • individual points of the operating current-temperature curve are shown in the look-up table.
  • the temperature to be considered is the operating temperature of the LED module 1 or the LEDs or the ambient temperature.
  • the circuit 2 preferably has an input for receiving information relating to this temperature.
  • the LED module 1 comprises a thermistor TH connected to this input.
  • the analog temperature information measured at the thermistor TH is preferably forwarded to an analog-to-digital converter 24.
  • the control unit 3 receives the digital temperature information and selects in the look-up table the corresponding values for the operating currents Ir, Iw of the LED channels K1, K2.
  • the thermistor TH is just one example of how the temperature information can be measured or determined. Instead of a thermistor, alternative temperature-dependent components can also be used. such as a photoresistor, thermocouple, transistor, diode.
  • control unit 3 determines a temperature of, for example, 10 ° C., for which operating currents are stored in the table, then the corresponding operating currents Ir (10 ° C.), Iw (10 ° C.) are selected. If no corresponding operating currents Ir, Iw are stored in the look-up table for the measured temperature, the control unit 3 can perform interpolation of the data of the look-up table in order to match the operating currents Ir, Iw that match the measured temperature to investigate. For example, a linear interpolation can be performed, which minimizes the computational effort, or even more complex interpolation, such as spline interpolation.
  • control unit 3 can first search for the closest stored temperature to the measured temperature, and select the corresponding operating currents Ir, Iw: if, for example, 6 ° C. are measured, the control unit 3 looks in the look-up table of FIG Fig. 1 the temperature is 5 ° C and then selects the operating currents Ir (5 ° C), Iw (5 ° C).
  • Fig. 1 shows a simple implementation of the invention in that there are two LED channels K1, K2, namely a monochrome, in particular red channel and a dye-converted white light channel.
  • the look-up table ensures that, regardless of the temperature, a constant color locus of the generated red / white spectrum is always achieved. For discrete temperature values, in each case a characteristic curve for the red characteristic or a characteristic curve for the white channel is stored.
  • Fig. 2 shows a further embodiment of an LED module according to the invention.
  • the LED module 1 ' is based on the LED module 1 of Fig. 1 ,
  • the LED module 1 comprises N LED channels K1, K2, K3, KN.
  • memory 5 several look-up tables are stored, which are constructed similar to those in connection with Fig. 1 explained look-up table.
  • Four look-up tables for a color temperature of 2500 K, 3500 K, 4200 K and 6500 K are stored.
  • the look-up tables are not static, but may well undergo dynamic development in the course of, for example, the life of the LEDs or of the LED module. For example, a change in the values in the look-up tables may occur depending on the counted operating period of the LED module.
  • a measuring unit 22 and an aging control unit 23 are provided in the LED module 1 '. Depending on the operating period of the LED module 1 'counted by the measuring unit 22, the aging control unit 23 causes a corresponding adaptation of the operating current values stored in the tables.
  • the brightness of an LED may vary with time, so that it may be necessary to regulate the contribution that each LED channel makes to the mixed light, so that an overall characteristic of the LED produced mixed light still corresponds to the target color location.
  • the measuring unit 22 measures the operating time of the LED module 1 '.
  • the aging control unit 23 performs the adjustment of the operating current for each LED channel.
  • a photodiode PH is preferably connected to the circuit.
  • An analog-to-digital converter 25 converts the analog measurement signal from the photodiode PH into a digital signal, which is supplied to the control unit 3 '.
  • the photodiode is here representative of a sensor for measuring the brightness or Umbegungshellmaschine. Instead of a photodiode, e.g. a phototransistor may also be provided.
  • the operating current for the LED channels may be adjusted. For example, if the ambient brightness increases, the respective operating current for the LED channels can be increased or reduced.
  • the ambient light adaptation carried out with the aid of the photodiode PH can be a color locus and luminous flux adaptation as a function of the ambient situation.
  • the circuit 2 ' also has a digital interface 21.
  • This interface 21 is connected to the control unit 3 'and is preferably configured bidirectionally.
  • a look-up table can be sent from an external unit (not shown) via the digital interface 21 to the control unit 3 ', wherein this look-up table can in turn be stored in the memory unit 5. Otherwise, also in the storage unit 5 stored tables are sent via the interface 21 to an external unit.
  • the adaptation of the operating currents which is caused in the course of aging of the LEDs or a change in the ambient brightness, can be influenced via the interface 21.
  • the LED module 1 can be measured with spectrometer and / or color sensor. From this, the look-up tables are then discretized and stored in the memory unit 2 assigned to the circuit 2. These tables may preferably be for comparable LED modules, i. with comparable LED placement, are used and stored in the memory unit of these comparable LED modules.
  • the LED module 1 can be characterized with regard to the LEDs used with reference to a maximum of three specified test points with regard to wavelength, intensity and color location. From the combination of the LEDs, the correct look-up tables LUTs can be created and stored from a data pool.
  • an LED module can be optically and electrically measured according to the following criteria. For each target color location eg on the Plank curve or within the range spanned by the light sources, values for the operating currents for the LED channels determined. These values are only valid for one temperature. For this reason, further values for the operating currents are determined for different temperatures. This can be done, for example, by heating the carrier board of the LED module to the desired temperature. All determined values for a target color location are then stored in a look-up table in the memory unit 5.
  • the look-up tables found in an initialization phase are stored in the memory of the circuit.
  • Possible correction factors such as Lifetime degradation, linear dimming, etc., can also be stored as factors or formulas due to the known LED data.
  • the correction factors relating to the LED aging or lifetime can be stored in the aging control unit 23 or alternatively in the control unit 3.
  • the corresponding current values for a desired color location are stored in a look-up table as a function of the temperature on the basis of the measurement results.
  • the corresponding current values are automatically adapted to the situation, which allows an accurate and reproducible color temperature to be achieved with the same luminous flux.
  • Fig. 3 is an embodiment of an LED driver 30, as shown for example in an LED channel of the operating device according to Fig. 1 or Fig. 2 can be used.
  • the LED driver 30 has an operational amplifier 31, to the input side of which the current-determining reference signal generated by the respective digital-to-analog converter DA1, DA2, DA3, DA4 is supplied.
  • the second input and the output of the operational amplifier 31 are connected via a capacitor 32.
  • the output of the operational amplifier 31 is connected to the control input of a transistor 33, which is a bipolar transistor or preferably a MOSFET.
  • the emitter terminal of the transistor 33 is in turn connected to the second input of the operational amplifier 31.
  • the capacitor 32 is connected in parallel to the base-emitter path of the transistor 33.
  • a precision resistor 34 is connected between the emitter terminal and ground.
  • the collector terminal of the transistor 33 is designed for connection to the LEDs of the respective LED channel.
  • FIG. 4 A further embodiment is shown, in which the drive values for each LED driver T1, T2 are supplied in succession to a single digital-to-analog converter DA.
  • This analog drive value is then fed to a further unit 40 in the form of preferably a demultiplexer, which is connected to a sample-and-hold circuit SH1, SH2 of the respective LED channel K1, K2. With the aid of this sample-and-hold circuit SH1, SH2, the starting values for each LED channel are recorded until the next change in the current value.
  • a further unit 40 in the form of preferably a demultiplexer, which is connected to a sample-and-hold circuit SH1, SH2 of the respective LED channel K1, K2.
  • SH1, SH2 With the aid of this sample-and-hold circuit SH1, SH2, the starting values for each LED channel are recorded until the next change in the current value.
  • only one digital-to-analog converter DA is necessary.
  • the subject invention now shows a clearer, more accurate and less computational and approximate effort associated achievement of a target color location.
  • the invention enables a precise linear regulation or current dimming. Accordingly, no flickering and no disturbing dark stripes in TV or camera shots at the same color location or color temperature is caused.
  • the invention relates to the achievement of a target color location.
  • intensity values can also be stored in look-up tables.
  • a linear dimming or a logarithmic dimming can be implemented.
  • This logarithmic dimming is mapped, for example, into corresponding look-up tables, since the sensitivity of the human eye follows a logarithmic function.
  • limited color vision, but still excellent light-dark vision (shades of gray) are made possible at very low magnitudes.
  • a logarithmic dimming of the light-generating LED module is perceived as more pleasant and with higher acceptance compared to linear dimming.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
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Claims (13)

  1. Circuit (2) destiné à piloter plusieurs canaux LED (K1, K2) présentant respectivement au moins une LED (L1, L2) et destinés à la production d'une lumière mixte à partir de la lumière produite par les canaux LED (K1, K2) respectifs, respectivement un tableau de consultation étant prévu pour chaque localisation chromatique cible qui peut être atteinte par le module de LED, lequel tableau est mis en mémoire dans une unité de mémoire (5) du circuit dans laquelle le courant de service (Ir, Iw) est mis en mémoire pour chaque canal LED (K1, K2) ,
    des valeurs discrètes d'une courbe caractéristique courant de service/température étant mises en mémoire pour chaque canal LED (K1, K2), et
    le circuit étant constitué pour, en fonction d'une température mesurée et en partant de la courbe caractéristique courant de service/température mise en mémoire, déterminer le courant de service respectif pour les canaux LED (K1, K2),
    le circuit étant en outre constitué pour, en fonction d'une durée de fonctionnement du circuit, corriger le courant de service respectif pour chaque canal LED (K1, K2), le circuit présentant une unité de mesure (22) et une unité de commande de vieillissement (23) et, en fonction d'une durée de temps de fonctionnement du module de LED (1) comptée par l'unité de mesure (22), l'unité de commande de vieillissement (23) provoquant une adaptation correspondante des valeurs de courant de service enregistrées dans les tableaux.
  2. Circuit selon la revendication 1,
    le courant de service (Ir, Iw) étant enregistré en fonction de la température.
  3. Circuit selon la revendication 1 ou 2,
    présentant une unité de commande (3) qui, en fonction du tableau de consultation, stipule une valeur de pilotage pour une source de courant (T1, T2) prévue pour le fonctionnement d'un canal LED (K1, K2).
  4. Circuit selon la revendication 3,
    la valeur de pilotage étant constituée de telle sorte que la source de courant (T1, T2) peut réaliser une gradation à une valeur de courant constante et/ou une modulation de largeur d'amplitude d'un courant de service nominal.
  5. Circuit selon l'une des revendications précédentes,
    présentant une entrée pour la mesure d'une température ambiante, cette entrée étant connectée de préférence à un élément sensible à la température, par ex. une thermistance (TH).
  6. Circuit selon l'une des revendications précédentes,
    présentant une entrée pour un signal de mesure d'un capteur de luminosité (PH), le courant de service respectif pour chaque canal LED (K1, K2) étant corrigé ou respectivement modifié en fonction de la luminosité mesurée.
  7. Circuit selon l'une des revendications précédentes, présentant une interface de communication (21) destinée à la réception de tableaux de consultation.
  8. Circuit selon l'une des revendications précédentes, la localisation chromatique cible étant située sur la courbe de Planck ou à l'intérieur d'une zone cible spécifiée au préalable à l'intérieur de la zone définie par les LED (L1, L2).
  9. Circuit selon l'une des revendications précédentes, présentant plusieurs tableaux de consultation destinés au pilotage de valeurs discrètes sur la courbe de lumière blanche de Planck.
  10. Circuit selon l'une des revendications précédentes, différentes luminosités d'une localisation chromatique cible étant mises en mémoire dans des tableaux de consultation.
  11. Circuit selon l'une des revendications précédentes, sous la forme d'un circuit intégré, de préférence sous la forme d'un microcontrôleur, d'un ASIC ou d'une version hybride de ceux-ci.
  12. Module de LED, présentant un circuit selon l'une des revendications précédentes.
  13. Procédé destiné au pilotage de plusieurs canaux LED (K1, K2) présentant respectivement au moins une (L1, L2) et à la production d'une lumière mixte à partir de la lumière produite par les canaux LED (K1, K2) respectifs,
    respectivement un tableau de consultation étant prévu pour chaque localisation chromatique cible qui peut être atteinte par le module de LED, tableau dans lequel le courant de service (Ir, Iw) pour chaque canal LED (K1, K2) est mis en mémoire,
    des valeurs discrètes d'une courbe caractéristique courant de service/température étant mises en mémoire pour chaque canal LED (K1, K2), et
    le courant de service respectif pour les canaux LED (K1, K2) étant déterminé en fonction d'une température mesurée et en partant de la courbe caractéristique courant de service/température mise en mémoire,
    le courant de service respectif pour chaque canal LED (K1, K2) étant corrigé en fonction d'une durée de fonctionnement d'un circuit, et le circuit présentant une unité de mesure (22) et une unité de commande de vieillissement (23) et, en fonction d'une durée de temps de fonctionnement du module de LED (1) comptée par une unité de mesure (22), une unité de commande de vieillissement (23) provoquant une adaptation correspondante des valeurs de courant de service enregistrées dans les tableaux.
EP13788707.1A 2012-10-31 2013-10-23 Procédé et dispositif pour commander des del, avec une correction de température, au moyen de tables de consultation Not-in-force EP2901815B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102012219900 2012-10-31
DE102013201915.7A DE102013201915A1 (de) 2012-10-31 2013-02-06 Verfahren und Anordnung zur Steuerung von LEDs
PCT/EP2013/072160 WO2014067830A1 (fr) 2012-10-31 2013-10-23 Procédé et dispositif pour commander des del, avec une correction de température, au moyen de tables de consultation

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Publication Number Publication Date
EP2901815A1 EP2901815A1 (fr) 2015-08-05
EP2901815B1 true EP2901815B1 (fr) 2018-07-11

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DE102019208347A1 (de) * 2019-06-07 2020-12-10 Volkswagen Aktiengesellschaft Verfahren zum Betreiben eines Leuchtdioden-Moduls und Leuchtdioden-Modul
US11432385B2 (en) * 2020-08-07 2022-08-30 Analog Devices, Inc. Single comparator exponential-scale PWM dimming
DE102020132948A1 (de) * 2020-12-10 2022-06-15 OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung Optoelektronisches modul und verfahren zur herstellung eines optoelektronischen moduls
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DE102010000672A1 (de) * 2010-01-05 2011-07-07 Tridonic Ag Kombiniertes Verfahren zum Betreiben eines elektrischen Leuchtmittels sowie Betriebsschaltung

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DE102013201915A1 (de) 2014-05-15
WO2014067830A1 (fr) 2014-05-08

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