EP2177078A1 - Device and method for controlling light emission - Google Patents
Device and method for controlling light emissionInfo
- Publication number
- EP2177078A1 EP2177078A1 EP08785259A EP08785259A EP2177078A1 EP 2177078 A1 EP2177078 A1 EP 2177078A1 EP 08785259 A EP08785259 A EP 08785259A EP 08785259 A EP08785259 A EP 08785259A EP 2177078 A1 EP2177078 A1 EP 2177078A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light sources
- light
- periods
- brightness
- sensor
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000005259 measurement Methods 0.000 claims description 36
- 239000003086 colorant Substances 0.000 claims description 7
- 230000001419 dependent effect Effects 0.000 claims description 4
- 230000032683 aging Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000001795 light effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 108010076504 Protein Sorting Signals Proteins 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000002431 foraging effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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]
- H05B45/30—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.
- 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 brightness information about the currently active light source can then be obtained via the sensor, with a corresponding activation of the LEDs overall being carried out on the basis of this information.
- the individual measuring periods are preferably dimensioned so short that the regular operation of the lamp is influenced as little as possible.
- 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 object is achieved by a device for emitting light, which has the features of claim 1, and by a method for controlling the light emission according to claim 11.
- Advantageous developments of the invention are the subject of the dependent claims.
- 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, it is provided in the procedure according to the invention that light from several light sources is detected simultaneously in at least one of the 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 light emitted in comparison with the regular operation is changed relatively slightly in the calibration phase, although, despite all, an exact determination of the light intensity of the individual light sources is made possible. Accordingly, the procedure according to the invention in turn 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.
- the invention thus proposes 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, the control unit being 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 measuring 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 calculated based on the information obtained in the measurement periods, the brightness of each individual light source, 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 various light sources in the calibration phase there are different possibilities, which are the subject of the dependent claims.
- 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 measuring periods each have the same duration.
- the length of the measurement periods can be adjusted in a suitable manner. This procedure is particularly suitable when the brightness control of the light sources takes place in that they are operated with pulse-width-modulated (PWM) signals.
- PWM pulse-width-modulated
- 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.
- FIG. 1 shows the schematic expansion of an embodiment of a device according to the invention for emitting light
- the device shown in Fig. 1 and generally provided with the reference numeral 1 for light emission initially has three light sources 2 X to 2 3 , which for emitting light in the colors red (L R ), green (L G ) and blue (L B ) are formed.
- the light sources 2i 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 2i to 2 3 is achieved by three driver circuits 3i to 33, which supply their respective associated light source 2i to 2 3 with a corresponding power.
- the control of the light sources 2 ⁇ to 2 3 by the driver circuits 3i to 3 3 takes place in accordance with the driver circuits 3i 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 ⁇ to 2 3 by the driver circuits 3i 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 ⁇ 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 2i to 2 3 mixed light make is detected the light emitted from the light sources 2i to 2 3 Light in its entirety from a sensor 5, for example.
- a suitable control of the light sources 2i to 2 3 is performed in a calibration phase, in which case the brightness for the individual light sources 2i to 2 3 is calculated by the control unit 4 from the signals S delivered by the sensor 5 ,
- 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.
- a corresponding modification of the control of the light sources 2 ⁇ 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 shows a first exemplary embodiment of the procedure according to the invention, 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, in a second measuring period the second light source and in a third measuring period the first light source.
- the signals detected by the sensor during these three measurement periods are then composed as follows:
- L ⁇ (S ⁇ + S2 - S3) / 2
- L2 ⁇ S ⁇ - S2 + S3) / 2
- L3 (-S ⁇ + S2 + S3) / 2
- 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.
- FIG. 3 A variant of the procedure explained with reference to FIG. 2 is shown in FIG. 3 and consists in the fact that the light sources are deactivated one after the other in the three measurement periods of the calibration phase, so that the following measurement signals result:
- control unit can easily deduce the individual brightness since now the following applies:
- this method can be further optimized by varying the order in which the light sources are deactivated in the individual measuring periods in successive calibration phases. In this way, the repetitive emergence of similar light or color sequences is avoided, wherein such a variation of the sequence could also be used in the method according to FIG. 2.
- FIG. 4 A further possibility to supplement the method illustrated in FIG. 3 is shown in FIG. 4.
- 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 sensitivity of the human eye is relatively high at low brightness values, the change in intensity is even lower for a viewer compared to the conventional operation, which is why this measure-which, of course, could also be used in the method according to FIG. 2-additionally contributes to this 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.
- 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 ⁇ tl, ⁇ t2 and ⁇ t3 can be determined.
- 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 causing intensity changes in the emitted light, which are clearly perceptible to a viewer.
- the lighting properties of the device are significantly improved in this way.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Semiconductor Lasers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007036978A DE102007036978A1 (en) | 2007-08-06 | 2007-08-06 | Device and method for controlling the light output |
PCT/EP2008/006317 WO2009018958A1 (en) | 2007-08-06 | 2008-07-31 | Device and method for controlling light emission |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2177078A1 true EP2177078A1 (en) | 2010-04-21 |
EP2177078B1 EP2177078B1 (en) | 2016-06-29 |
Family
ID=38537865
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08785259.6A Not-in-force EP2177078B1 (en) | 2007-08-06 | 2008-07-31 | Device and method for controlling light emission |
Country Status (6)
Country | Link |
---|---|
US (1) | US8358075B2 (en) |
EP (1) | EP2177078B1 (en) |
CN (1) | CN101772988B (en) |
AT (1) | AT516703B1 (en) |
DE (1) | DE102007036978A1 (en) |
WO (1) | WO2009018958A1 (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010003593A1 (en) * | 2010-04-01 | 2011-10-06 | Zumtobel Lighting Gmbh | Method and device for determining a control value or a control value combination required to achieve a desired light output |
EP2677387A1 (en) * | 2012-06-18 | 2013-12-25 | Thales Deutschland GmbH | Traffic light luminaire with colour stabilization |
USRE48956E1 (en) | 2013-08-20 | 2022-03-01 | Lutron Technology Company Llc | Interference-resistant compensation for illumination devices using multiple series of measurement intervals |
USRE48955E1 (en) | 2013-08-20 | 2022-03-01 | Lutron Technology Company Llc | Interference-resistant compensation for illumination devices having multiple emitter modules |
US9578724B1 (en) | 2013-08-20 | 2017-02-21 | Ketra, Inc. | Illumination device and method for avoiding flicker |
US9345097B1 (en) | 2013-08-20 | 2016-05-17 | Ketra, Inc. | Interference-resistant compensation for illumination devices using multiple series of measurement intervals |
JP2017526110A (en) * | 2014-06-25 | 2017-09-07 | ケトラ・インコーポレーテッド | LED lighting device and method for calibrating and controlling an LED lighting device with respect to temperature, drive current variation and time |
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 (en) | 2015-06-02 | 2016-12-08 | Tridonic Gmbh & Co Kg | Multi-channel LED drivers |
CZ2017796A3 (en) * | 2017-12-12 | 2019-06-19 | Rieter Cz S.R.O. | Optical yarn sensor and how to control it |
US11272599B1 (en) | 2018-06-22 | 2022-03-08 | Lutron Technology Company Llc | Calibration procedure for a light-emitting diode light source |
DE202021004120U1 (en) | 2021-03-18 | 2022-09-12 | Marquardt Gmbh | Calibration device for calibrating color or photometric properties of an LED lighting device |
DE102021202642A1 (en) | 2021-03-18 | 2022-09-22 | Marquardt Gmbh | Method and calibration device for calibrating color or photometric properties of an LED lighting device |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6756107B1 (en) | 1998-12-16 | 2004-06-29 | Asglawo Gmbh-Stoffe Zum Daemmen Und Verstaerken | Mounting mat for mounting an exhaust-gas catalytic converter |
US6127783A (en) | 1998-12-18 | 2000-10-03 | Philips Electronics North America Corp. | LED luminaire with electronically adjusted color balance |
US6495964B1 (en) * | 1998-12-18 | 2002-12-17 | Koninklijke Philips Electronics N.V. | LED luminaire with electrically adjusted color balance using photodetector |
US6741351B2 (en) * | 2001-06-07 | 2004-05-25 | Koninklijke Philips Electronics N.V. | LED luminaire with light sensor configurations for optical feedback |
US6630801B2 (en) * | 2001-10-22 | 2003-10-07 | Lümileds USA | Method and apparatus for sensing the color point of an RGB LED white luminary using photodiodes |
AU2003211809A1 (en) * | 2002-03-01 | 2003-09-16 | Sharp Kabushiki Kaisha | Light emitting device and display unit using the light emitting device and reading device |
EP1579734A1 (en) * | 2002-12-20 | 2005-09-28 | Koninklijke Philips Electronics N.V. | Sensing light emitted from multiple light sources |
DE102004018912A1 (en) * | 2004-04-15 | 2005-11-03 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Device for light control |
CA2576099C (en) | 2004-08-06 | 2015-02-10 | Tir Systems Ltd. | Lighting system including photonic emission and detection using light-emitting elements |
KR20070086371A (en) * | 2004-11-19 | 2007-08-27 | 코닌클리즈케 필립스 일렉트로닉스 엔.브이. | A feedback control system for controlling the light output of a led unit |
EP1878317B1 (en) * | 2005-04-21 | 2015-12-23 | Radiant Research Limited | Illumination control system for light emitters |
DE102005049579A1 (en) * | 2005-10-17 | 2007-04-19 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Light source that emits mixed-color light, and methods for controlling the color location of such a light source |
JP4514770B2 (en) * | 2007-05-10 | 2010-07-28 | 日本テキサス・インスツルメンツ株式会社 | Backlight device |
US7595786B2 (en) * | 2007-11-13 | 2009-09-29 | Capella Microsystems, Corp. | Illumination system and illumination control method for adaptively adjusting color temperature |
-
2007
- 2007-08-06 DE DE102007036978A patent/DE102007036978A1/en not_active Withdrawn
-
2008
- 2008-07-31 CN CN200880102110.1A patent/CN101772988B/en not_active Expired - Fee Related
- 2008-07-31 EP EP08785259.6A patent/EP2177078B1/en not_active Not-in-force
- 2008-07-31 AT ATA9251/2008A patent/AT516703B1/en not_active IP Right Cessation
- 2008-07-31 US US12/670,983 patent/US8358075B2/en not_active Expired - Fee Related
- 2008-07-31 WO PCT/EP2008/006317 patent/WO2009018958A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2009018958A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20100301757A1 (en) | 2010-12-02 |
US8358075B2 (en) | 2013-01-22 |
AT516703B1 (en) | 2016-08-15 |
AT516703A5 (en) | 2016-08-15 |
CN101772988A (en) | 2010-07-07 |
CN101772988B (en) | 2014-11-26 |
DE102007036978A1 (en) | 2009-02-12 |
WO2009018958A1 (en) | 2009-02-12 |
EP2177078B1 (en) | 2016-06-29 |
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