EP2177078B1 - Vorrichtung und verfahren zur steuerung der lichtabgabe - Google Patents

Vorrichtung und verfahren zur steuerung der lichtabgabe Download PDF

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Publication number
EP2177078B1
EP2177078B1 EP08785259.6A EP08785259A EP2177078B1 EP 2177078 B1 EP2177078 B1 EP 2177078B1 EP 08785259 A EP08785259 A EP 08785259A EP 2177078 B1 EP2177078 B1 EP 2177078B1
Authority
EP
European Patent Office
Prior art keywords
light
light sources
measurement
level
light source
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.)
Not-in-force
Application number
EP08785259.6A
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German (de)
English (en)
French (fr)
Other versions
EP2177078A1 (de
Inventor
Günther SEJKORA
Paul Hartmann
Eduardo Pereira
Alexander Barth
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 Jennersdorf GmbH
Tridonic GmbH and Co KG
Original Assignee
Tridonic Jennersdorf GmbH
Tridonic GmbH and Co KG
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Application filed by Tridonic Jennersdorf GmbH, Tridonic GmbH and Co KG filed Critical Tridonic Jennersdorf GmbH
Publication of EP2177078A1 publication Critical patent/EP2177078A1/de
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Publication of EP2177078B1 publication Critical patent/EP2177078B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H05B45/22—Controlling the colour of the light using optical feedback

Definitions

  • the present invention relates to a device for controlling the light output of a plurality of light sources according to the preamble of claim 1 and a corresponding method thereof.
  • a device for controlling the light output of a plurality of light sources according to the preamble of claim 1 and a corresponding method thereof With the device according to the invention and the method according to the invention, in particular a possibility for effective and accurate color control for LED lights is provided.
  • the device and the method basically work according to the principle of a so-called feed-back loop.
  • a light source (10) emitting mixed-color light containing light of at least two different colors emitted by a plurality of primary light sources (1) in which the primary light source (1) is divided into groups and the brightness values of primary light sources (1) within a group are separately detected and controlled by colors so that the color location of the mixed-color light is within a predetermined range of the CIE standard color chart. Furthermore, a method for controlling such a light source (10) and a lighting device with such a light source (10), for example, for the backlighting of a display.
  • LEDs or general semiconductor light-emitting elements are increasingly being used in lighting technology recently, since the achievable with such light sources achievements are sufficiently high even for larger lighting applications. LEDs have the advantage of higher efficiency over other types of light sources. Furthermore, the power and thus the brightness of a LED can be adjusted relatively easily, so that light can be generated in almost any hue by an appropriate mixture of different colors.
  • the present invention is therefore based on the object to open up a novel possibility for driving LED lights, in which measurements made during operation or calibrations of the individual light sources for a viewer are not or at least significantly less noticeable.
  • the solution according to the invention is again based on the already known idea of controlling the light sources during operation in recurring calibration phases in such a way that the light emitted by the light sources is detected and evaluated in a sequence of individual measurement periods.
  • the light sources to be evaluated are each activated separately in the individual measuring periods
  • the fact that the light sources are no longer individually activated but that the mixed light emitted by the light sources is also used at least in part means that the temporary deviations in the light output are much more difficult to discern for a viewer of the luminaire.
  • the procedure according to the invention leads to the fact that the color control can be performed in a reliable manner, but for this less or not at all must be intervened in the ongoing operation of the lamp.
  • the measurements for calibration can thus be performed permanently during normal operation of the luminaire, without this being associated with an impairment of the light output in the desired manner.
  • a device for emitting light which has at least three light sources, means for supplying energy to the light sources, a sensor for detecting the light emitted by the light sources in their entirety and a control unit for controlling the means for supplying energy, wherein the control unit is designed for this purpose in a calibration phase, to control the means for supplying energy in such a way that the light emitted by the light sources is detected by the sensor in a sequence of measurement periods, and to calculate the brightness of each individual light source on the basis of the information obtained from the sensor.
  • the light detected by the sensor originates from a plurality of the light sources in at least one measurement period.
  • a method for controlling the light output of at least three light sources is proposed, wherein during a calibration phase in a sequence of measurement periods, the light emitted by the light sources detected and based on the information obtained in the measurement periods, the brightness of each individual light source is calculated, and wherein the method according to the invention is characterized in that in at least one of the measurement periods the detected light originates from a plurality of the light sources.
  • the light sources are controlled such that in each case exactly one light source is deactivated during a measurement period.
  • This procedure leads to a particularly low influence or modification of the emitted light in comparison to a regular operation of the lamp, although, however, despite all the light intensity of each individual light source can be determined very accurately.
  • the light intensity of the light source can be deduced individually from the signals detected in the individual measurement periods.
  • the duration of the measuring periods is in each case matched to the differences between the respective pulse widths for the light sources, which ultimately means that the brightness of the individual light sources can be determined during ongoing operation, without there being a deviation in the control during the calibration phase. This means that no flickering or intensity or color changes occur during calibration.
  • the light sources of the device according to the invention are preferably formed by light-emitting semiconductor elements or LEDs. It can of course also be provided that in each case a single light source is represented by a plurality of LEDs that emit light of the same color.
  • the control unit After, according to the procedure of the invention, the brightness was determined for each individual light source, then a change in the intensity, the Aging is due to be compensated by the control unit.
  • the control unit is preferably connected to storage means or has storage means in which reference values for the brightness of the respective light source are stored. Based on a comparison between the brightness values determined in the calibration phase and the reference values, the currents supplied to the light sources can then be adjusted during operation in order to compensate for corresponding deviations.
  • the reference numeral 1 device for light output initially has three light sources 2 1 to 2 3 , which are designed to emit light in the colors red (L R ), green (L G ) and blue (L B ).
  • the light sources 2 1 to 2 3 can each be set independently in their brightness, which opens the possibility to provide mixed light of almost any hue and in a desired intensity.
  • the optical elements required for mixing the light are not shown for the sake of simplicity of illustration, but are already known from the prior art.
  • the independent control of the light sources 2 1 to 2 3 is achieved by three driver circuits 3 1 to 3 3 , which supply their respective assigned light source 2 1 to 2 3 with a corresponding power.
  • the control of the light sources 2 1 to 2 3 by the driver circuits 3 1 to 3 3 takes place in accordance with the driver circuits 3 1 to 3 3 supplied control signals, which are generated by a control unit 4 of the device for emitting light.
  • the control of the light sources 2 1 to 2 3 by the driver circuits 3 1 to 3 3 to adjust their brightness can be done in different ways.
  • Both methods described above are particularly suitable for the case that the light sources 2 1 to 2 3 are formed by LEDs, each light source can also be formed in each case from a number of multiple LEDs of the same color.
  • a color control for the light emitted from the light sources 2 1 to 2 3 mixed light emitted from the light sources 2 1 to 2 3
  • Light in its entirety from a sensor 5 of a photodiode for example. Detected, a corresponding signal S is transmitted to the control unit 4.
  • a suitable control of the light sources 2 1 to 2 3 is carried out in a calibration phase, in which case the brightness for the individual light sources 2 1 to 2 3 is selected from the signals S delivered by the sensor 5 by the control unit 4 is calculated.
  • the information obtained here is compared with reference values which are stored in a memory 6.
  • the memory 6 can either be connected to the control unit 4 or be part of the control unit 4. Based on the comparison values, a corresponding modification of the control of the light sources 2 1 to 2 3 can then be made in order to compensate for deviations in the light intensity of the individual light sources that occur over time, for example due to signs of aging.
  • Fig. 2 a first example of the procedure for controlling the light sources for carrying out a calibration is shown, wherein the time profile of the signals transmitted by the sensor 5 to the control unit 4 is shown. It should first be pointed out once again that the sensor 5 does not differentiate according to the colors of the light emitted by the light sources but only detects the total brightness. During normal operation, the sensor thus detects a signal S which represents the sum of the brightness values L1, L2 and L3 of the three light sources.
  • the light sources are now driven in successive measurement periods such that one of the three light sources is selectively deactivated in each case.
  • the third light source is deactivated
  • the second light source in a third measuring period the first light source.
  • S 2 L 1 + L 3
  • S 3 L 2 + L 3
  • the individual brightness information L1, L2 and L3 obtained in this way are then compared by the control unit with the reference values stored in the memory.
  • the current or power for each of the three light sources can then be adjusted in a corresponding manner to correspond to the respective reference value, whereby aging phenomena are compensated.
  • completion of the calibration phase is then transferred back to a conventional operation.
  • the procedure described above is characterized in that in each of the three measuring periods only one single light source is deactivated or the sensor evaluates a mixed light instead of a single color. This has the consequence that in the individual measurement periods compared to the light signal during normal operation significantly lower deviations occur, as would be the case if only a single light source would be activated. The deviations in the light emitted by the entire device relative to the normal operation are correspondingly much less perceptible to an observer. This also brings, for example, the advantage that the measurement periods are relatively long can be, without this effect would be recognizable to a viewer.
  • the accuracy in determining the individual light levels is significantly increased, in particular because there is no risk that due to short-term on and off effects that can lead to voltage spikes, distortions in the measurement result.
  • the measurements during the calibration phase can be carried out without problems in the range of about 100 Hz, which of course would also be possible to make measurements in the KHz range.
  • this method can be further optimized by varying the order in which the light sources are deactivated in the individual measurement periods in successive calibration phases. In this way, the repetitive emergence of similar light or color sequences is avoided, with such a variation of the order also in the method according to Fig. 2 could be used.
  • Fig. 4 shown in FIG Fig. 4 illustrated method represents an inventive embodiment.
  • the LEDs are not completely deactivated during the individual measuring periods but - as indicated schematically - dimmed down to a level which is below a perceptible by the sensor threshold.
  • the contribution of this light source to the sensor signal is negligible in this case, which is why the previously mentioned equations still apply and, in turn, the intensity of each individual light source can be determined.
  • the intensity change compared to the conventional operation for a viewer is again lower, which is why this measure - of course, according to a further embodiment of the invention in the method according to Fig. 2 be used - in addition to helping to avoid interference by calibrating the light sources.
  • the level below a threshold that can be dimmed during the calibration phase may also be above the threshold perceivable by the sensor.
  • the calibration phase may include at least one measurement period in which the LEDs are not deactivated or not completely activated in the sense of the previous calibration steps, but at which at least one LED, several LEDs or even all LEDs are dimmed down to the level below a threshold value.
  • the measurement of this at least one measurement period can be used as calibration information in order to evaluate the information obtained during the calibration phase, taking into account the knowledge of the levels of the LED below a threshold, in such a way that the information obtained is corrected for this calibration information during the further measurement phases.
  • the LED or the optics of the LED itself or the optics of the LED light designed so that only at a certain dimming level (brightness value of the LED) light is emitted to the environment and the sensor and thus the be defined for the sensor perceptible threshold.
  • the level below a threshold value can thus also be below the threshold perceptible by the sensor,
  • the sensor may also have a defined filter defining the threshold for visibility.
  • This threshold value can have different values or the same value for different wavelengths.
  • the threshold may be adjustable, for example, depending on the calibration information.
  • Fig. 5 now shows the time course of the signals received by the sensor in such a PWM operation, the signal sequence represents the normal operation of the LED light.
  • the light signals generated during normal operation can also be used to determine the intensities L1, L2 and L3 of the individual light sources. This is possible because the pulse widths for the individual light sources known (da predetermined by the control unit) and from this the time intervals ⁇ t1, ⁇ t2 and ⁇ t3 can be determined.
  • the peculiarity consists in the fact that the measuring periods for a calibration of the light sources are adapted to these time intervals, whereby the following results for the signals integrated over the three measuring periods and normalized to the pulse width duration PW:
  • S 1 * L 1 ⁇ ⁇ t 1 / PW + L 2 ⁇ .delta.t 1 / PW + L 3 ⁇ ⁇ t 1 / PW
  • S 2 * L 1 ⁇ ⁇ t 2 / PW + L 2 ⁇ ⁇ t 2 / PW
  • S 3 * L 1 ⁇ ⁇ t 3 / PW
  • the advantage of this approach is that the intensities of the individual light source during the ongoing operation can be determined without that compared to the conventional operation, a deviation in the control of the light sources must be made.
  • the measures for calibration of the light sources are no longer perceptible to a viewer. This, in turn, means that a corresponding readjustment of the LEDs can take place permanently during operation since calibration does not have to be carried out only in certain intermediate phases.
  • the method just described can also be modified in such a way that the times at which the LEDs operated in PWM mode are activated are selected differently. For different dimming levels then different start and stop times can be used, for example. Based on a table, to cause no regular intensity peaks. This measure in turn helps to reduce the externally noticeable effects when calibrating the light sources.
  • the method according to the invention is fundamentally applicable to devices for emitting light which have at least three light sources which can be controlled independently of one another, in particular LEDs. In the event that more than three light sources are used, the method can be easily extended accordingly. The resulting equations for determining the respective individual light intensities would then increase correspondingly, although in spite of everything a clear determination of the individual light intensities for each light source is possible. It is not mandatory here either required that the different light sources emit light of different colors. The only prerequisite for carrying out the method according to the invention is that at least two different colors are provided by the light source.
  • the above-described measures are used in particular to compensate for deviations in the intensities of the individual light sources, which are due to aging phenomena. Furthermore, in order to be able to take account of manufacturing tolerances in the manufacture of the LEDs, it can additionally be provided that the LEDs are measured once after assembly with the aid of a suitable color sensor and exactly determined for each light source, in which strength and color light emitted from the corresponding LEDs. This information can then be used during later operation to determine how much the light sources must be driven to produce light of a desired mixed color. This measure thus additionally contributes to ensuring that ultimately a mixed light is generated which lies exactly at the desired color location.
  • the present invention provides a possibility to readjust light sources during the normal operation of an LED light, without any intensity changes in the emitted light occurring, which are clearly perceptible to a viewer.
  • the lighting properties of the device are significantly improved in this way.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Semiconductor Lasers (AREA)
EP08785259.6A 2007-08-06 2008-07-31 Vorrichtung und verfahren zur steuerung der lichtabgabe Not-in-force EP2177078B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007036978A DE102007036978A1 (de) 2007-08-06 2007-08-06 Vorrichtung und Verfahren zur Steuerung der Lichtabgabe
PCT/EP2008/006317 WO2009018958A1 (de) 2007-08-06 2008-07-31 Vorrichtung und verfahren zur steuerung der lichtabgabe

Publications (2)

Publication Number Publication Date
EP2177078A1 EP2177078A1 (de) 2010-04-21
EP2177078B1 true EP2177078B1 (de) 2016-06-29

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EP08785259.6A Not-in-force EP2177078B1 (de) 2007-08-06 2008-07-31 Vorrichtung und verfahren zur steuerung der lichtabgabe

Country Status (6)

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US (1) US8358075B2 (pt)
EP (1) EP2177078B1 (pt)
CN (1) CN101772988B (pt)
AT (1) AT516703B1 (pt)
DE (1) DE102007036978A1 (pt)
WO (1) WO2009018958A1 (pt)

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EP2677387A1 (en) * 2012-06-18 2013-12-25 Thales Deutschland GmbH Traffic light luminaire with colour stabilization
USRE48955E1 (en) 2013-08-20 2022-03-01 Lutron Technology Company Llc Interference-resistant compensation for illumination devices having multiple emitter modules
US9345097B1 (en) 2013-08-20 2016-05-17 Ketra, Inc. Interference-resistant compensation for illumination devices using multiple series of measurement intervals
US9578724B1 (en) 2013-08-20 2017-02-21 Ketra, Inc. Illumination device and method for avoiding flicker
USRE48956E1 (en) 2013-08-20 2022-03-01 Lutron Technology Company Llc Interference-resistant compensation for illumination devices using multiple series of measurement intervals
KR20170041196A (ko) * 2014-06-25 2017-04-14 케트라, 인코퍼레이티드 온도 및 구동 전류의 변화, 및 시간에 따라서 led 조명 디바이스를 캘리브레이션 및 제어하기 위한 방법 및 led 조명 디바이스
US9557214B2 (en) 2014-06-25 2017-01-31 Ketra, Inc. Illumination device and method for calibrating an illumination device over changes in temperature, drive current, and time
US9510416B2 (en) 2014-08-28 2016-11-29 Ketra, Inc. LED illumination device and method for accurately controlling the intensity and color point of the illumination device over time
US9392660B2 (en) 2014-08-28 2016-07-12 Ketra, Inc. LED illumination device and calibration method for accurately characterizing the emission LEDs and photodetector(s) included within the LED illumination device
WO2016057089A1 (en) * 2014-10-09 2016-04-14 Ketra, Inc. Interference-resistant compensation in illumination devices comprising light emitting diodes
DE102015210189A1 (de) 2015-06-02 2016-12-08 Tridonic Gmbh & Co Kg Mehrkanal-LED-Konverter
CZ2017796A3 (cs) * 2017-12-12 2019-06-19 Rieter Cz S.R.O. Optický snímač příze a způsoby jeho řízení
US11272599B1 (en) 2018-06-22 2022-03-08 Lutron Technology Company Llc Calibration procedure for a light-emitting diode light source
DE202021004120U1 (de) 2021-03-18 2022-09-12 Marquardt Gmbh Kalibrierungsvorrichtung zum Kalibrieren von farb- oder fotometrischen Eigenschaften einer LED-Beleuchtungseinrichtung
DE102021202642A1 (de) 2021-03-18 2022-09-22 Marquardt Gmbh Verfahren und Kalibrierungsvorrichtung zum Kalibrieren von farb- oder fotometrischen Eigenschaften einer LED-Beleuchtungseinrichtung

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Also Published As

Publication number Publication date
CN101772988A (zh) 2010-07-07
US20100301757A1 (en) 2010-12-02
AT516703A5 (de) 2016-08-15
AT516703B1 (de) 2016-08-15
EP2177078A1 (de) 2010-04-21
US8358075B2 (en) 2013-01-22
CN101772988B (zh) 2014-11-26
DE102007036978A1 (de) 2009-02-12
WO2009018958A1 (de) 2009-02-12

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