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]
  • H05B45/20—Controlling the colour of the light
  • H05B45/22—Controlling the colour of the light using optical feedback
• • 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]
  • H05B45/10—Controlling the intensity 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]
  • H05B45/20—Controlling the colour of the light
  • H05B45/28—Controlling the colour of the light using temperature feedback
• • 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
  • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
  • H05B47/10—Controlling the light source
• • 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
  • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
  • H05B47/10—Controlling the light source
  • H05B47/105—Controlling the light source in response to determined parameters

Definitions

• the invention relates to a method and an arrangement for setting a color location and a lighting system.
• more than three individual colors can be used in lighting systems.
• a mixture of more than three individual colors for one color location results in an overdetermined system of equations.
• light sources different light means, in particular light emitting diodes and / or combinations of light emitting diodes of different wavelengths are used in a lighting system.
• the object of the invention is to avoid the abovementioned disadvantages and in particular to provide a possibility for the particularly efficient setting of a color locus of a lighting system comprising more than three light sources. This object is achieved according to the features of the independent claims. Further developments of the invention will become apparent from the dependent claims.
• n light sources are provided, of which n-3 light sources are preset or preset; - Wherein a color location difference of the n light sources is determined by a target color location;
• the color location is determined in particular in the form of coordinates of a color space.
• the intensities of the three light sources can be modified in such a way that a coordinate in the color space, also referred to as a color value, is set or attained.
• each light source has a plurality of light sources, e.g. LEDs, may include.
• each light source may comprise a plurality of LEDs each having substantially the same wavelength. It is also possible for a light source to have a plurality of LEDs of different wavelengths.
• the presetting of the n-3 light sources can advantageously be made offline by optical and physical parameters (wavelengths of the light sources, radiation characteristics, physical design) and the lighting system (expansion, distances between the light sources, etc.) including the light sources are taken into account.
• optical and physical parameters wavelengths of the light sources, radiation characteristics, physical design
• the lighting system expansion, distances between the light sources, etc.
• the overdetermined system of equations (3 light sources are sufficient to set the color locus) can be reduced in such a way that efficiently a target color location can be adjusted by means of the remaining 3 light sources.
• a refinement is that the color location difference of the n light sources is determined on the basis of at least one sensor, wherein the at least one sensor is in particular one of the following sensors:
• a brightness sensor in particular a V ⁇ -rated brightness sensor; a temperature sensor;
• At least one sensor is provided for each light source or for a group of light sources.
• a sensor for the lighting system comprising the light sources can be provided, which determines a total intensity of a color location and a temperature.
• the setting of the color locus on the basis of the n light sources is such that at least one of the target variables - Color Rendering Index;
• An application-dependent spectral distribution reaches a predetermined value as well as possible.
• a target value optimization can take place with regard to at least one of the stated target variables, wherein this optimization is expediently carried out in advance and stored or stored in or for a control and / or regulating unit for setting the light sources. It is also a further development that an optimization with regard to the at least one target variable is carried out in advance and in particular is provided as a control information for the 3 non-preset light sources.
• the 3 non-preset light sources span a triangle in a CIE x-y diagram, the triangle in particular having as large a surface as possible.
• One embodiment is that the n light sources or a part of the n light sources have only slight to no overlaps in their respective spectra.
• a part of the light sources each provide their own contribution to the overall spectrum, which is otherwise not supplied by at least a portion of the remaining light sources.
• the light source comprises at least one light-emitting diode.
• a next embodiment is that the 3 non-preset light sources are iteratively set so that the target color location is reached.
• the method can be used as repeating control at certain times.
• a relative or an absolute target color location and / or a brightness information is set in an adjustable manner for setting the target color location.
• a user e.g. in the case of a lamp or luminaire comprising the luminous sources, set a total brightness and a hue (for example within a predetermined range).
• the light sources are set on the resulting target color location.
• Group comprises three light sources and a second group comprises the remaining light sources
• the arrangement can be embodied in particular as a control and / or regulating unit (or a color management system) or comprise such.
• a development consists in that a unit for determining the color locus difference is provided on the basis of the at least one sensor. This can be carried out together with the unit for determining a setting of the light sources of the first group.
• An additional embodiment is that a drive unit is provided for adjusting the light sources.
• a brightness sensor in particular a V ⁇ -rated brightness sensor
• a lighting system comprising an arrangement as described herein.
• the lighting system can be designed as a light module, a lamp, a lamp or a headlight.
• Fig.l a way to control or setting a target color location by means of a color management system
• control cams for achieving an optimized color rendering of the lighting system comprising a plurality
• the approach presented here makes it possible, in particular, to set and continuously and / or iteratively regulate a color locus by means of a color management system, whereby preferably more than three light-emitting diodes with different wavelengths are used.
• Light sources which are preferably designed as LEDs has.
• the n light sources are determined by at least one of the following parameters:
• a ratio of the abovementioned parameters for the n light sources can be set in such a way that at least one of the following predefinable target variables - Color Rendering Index (CRI);
• CQS Color Quality Scale
• n light sources it is possible to select or predetermine the n light sources in such a way that they have a correspondingly favorable spectral distribution, which is perceived by a lighting system to be pleasant for a viewer.
• Light sources one each over the other Light sources complementary contribution in the light spectrum of the lighting system represent. If, for example, a light source, for example an LED, has a very limited spectral expansion within the desired spectrum of the lighting system, then further LEDs can be provided, the spectra of which additionally lie in a different frequency range. The overall spectrum thus results from the superposition of the spectra of the individual light sources.
• a (substantially) white light source with a correspondingly broad spectrum can be provided.
• the lighting system when adjusting the color locus of the lighting system can be achieved that due to the correspondingly optimized spectrum, the lighting system reproduces the set or preselected color in a pleasant and uniform manner for the viewer.
• n-3 predetermined parameters are given as color valencies Y4 ... Yn.
• a color location difference e.g. a color location difference to be determined by the target color location to be set.
• a target color location as well as a brightness of the lighting system may be used, for example. is set by a user.
• Target color valency Y total is preferably set to 100% or to the value to be reached by the system (brightness setting of the user).
• the 3 light sources with their given colors are now available to achieve a setting to the target color location.
• the parameters for setting the 3 light sources can be determined as follows:
• This equation enables the colorimetric calculation of the photometric variables or parameters Yi, Y 2 and Y 3 to be set for setting the difference color location or for achieving the desired color location.
• each of the 3 light sources may also comprise more than one light means or more than one LED.
• a plurality of LEDs having substantially the same color valence can be combined to form a luminous source.
• a plurality of LEDs of different color valences can also be combined to form a light source according to the present description.
• a measurement of the at least one control and / or controlled variable of the lighting system is carried out by means of at least one sensor comprising in particular:
• At least one brightness sensor in particular at least one V ⁇ -valued brightness sensor
• a control iteratively, continuously and / or at certain times take place such that a control unit (Color Management System) to be set Farbvalenzen Y newly determined (by re-measurement of at least one control and / or controlled variable of the lighting system) and thus for example responding to changes occurring in the junction temperatures of the LEDs by readjustment or stabilization of the target color location.
• a control unit Color Management System
• a luminous source comprises a controllable white light source
• the individual colors are not required separately depending on the desired color location.
• a common use of a control channel is possible.
• each light source may in particular comprise at least one light emitting diode
• the 3 light sources advantageously have different colors and span as large a color space that a freely specified color location within the color space by means of a Control of three colors can be stabilized and optimized to one or more target sizes spectrum can be determined.
• optimization of the spectrum with regard to specific target variables can be determined in advance, in particular once. Such an optimization can be complex and time-consuming, for example, and can therefore advantageously not take place on the lighting module itself.
• the optimization serves as input for the control (Color Management System) for achieving or setting the target color location on the basis of the freely adjustable light sources.
• the solution of the equation system for setting the target color location by means of three light sources can be performed quickly and efficiently on the light module.
• Fig.l shows a way to control or setting a target color location by means of a color management system 101.
• an input 102 here serves a total intensity of a target color location comprising a target color location with associated brightness.
• a further input variable 103 for the color management system 101 represents an optimized intensity of the colors of the n light sources in accordance with a drive curve as shown in FIG. 2. Starting from n light sources, the intensities of the light sources 4 to n are shown by way of example on the basis of the drive curves according to FIG determined by the color management system 101 based on a predetermined optimization after at least one target size. This default is used to set the remaining light sources 1 to 3 to reach the target color location.
• the color management system 101 includes a differential color location determination unit 104 and a single color intensities unit Y1, Y2, and Y3. Thus, the color management system 101 provides, as an output signal, the intensities Y1 to Yn of the light sources 1 to n which are used by a driver 108 for setting the light sources, here the LED light sources 106.
• At least one sensor 107 is used to determine the target color location of the lighting system comprising the LED light sources 106.
• the current color location for each LED or light source and / or the overall color location with associated temperature is forwarded to the Color Management System 101.
• the intensities of the light sources Yl, Y2 and Y3 are determined and forwarded together with the stored for the temperature intensities for the light sources Y4 to Yn to the driver 108 for adjusting the LED light sources.
• FIG. 2 shows control curves for achieving an optimized (and advantageously predetermined) color reproduction of the lighting system.
• a drive curve 201 shows the profile for a white LED
• a drive curve 202 shows the progression for a green LED
• a drive curve 203 shows the course for a red LED
• a drive curve 204 shows the progression for a yellow LED, with the curve starting at approx. 4700K
• Drive curve 204 has a brightness of about 0%
• a drive curve 205 shows the course for a blue LED, wherein the drive curve 205 to about 4700 K has a brightness of about 0%.
• the course of the drive curves 201 to 205 can be determined, for example, by means of a simulation of the lighting system.
• a target value optimization is advantageously carried out in such a way that the parameters of the n light sources are selected or determined such that a predetermined target value is achieved as well as possible.
• at least one of the following variables can serve as parameters: luminous flux; Illuminance; Light intensity; and / or luminance.
• at least one of the following target values can be used for target value optimization: Color Rendering Index; Color Quality Scale; and / or an application-dependent spectral distribution.
• color valencies Y4 to Yn of the n-3 light sources are predefined on the basis of the target value optimization.
• a measurement of at least one controlled and / or controlled variable of the lighting system takes place.
• at least one such control and / or controlled variable can be determined for each light source.
• a comparison is made between the measured control and / or controlled variable and a target specification, in particular a desired color value. The determined deviation is thereby overcome and set the target color value by a target specification, in particular a desired color value.
• Adjustment of the 3 non-predefined light sources takes place (step 305).
• step 305 branching is made to step 303 and thus an iterative regulation or setting of the target color location can be achieved.
• the approach presented here can be carried out in particular in a lighting system, for example a lighting unit or lighting module comprising a processor unit or a computer or a control unit for determining and setting the desired color location.
• the lighting system may comprise a plurality of light sources, each of which has in particular at least one LED.
• the described lighting system or lighting module can be used in particular in a headlight and / or in a lamp and / or light.
• the brightness or the hue may preferably be predetermined within certain limits by the user. Thus, for example, a color of bluish to reddish light can be made possible, the lamp using the approach presented here, the selected shade and the associated brightness maintains.

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

Applications Claiming Priority (2)

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Family Applications (1)

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• 2007
  • 2007-12-07 DE DE102007059131A patent/DE102007059131A1/de not_active Withdrawn
• 2008
  • 2008-12-04 TW TW097147040A patent/TW200937152A/zh unknown
  • 2008-12-05 KR KR1020107012667A patent/KR20100082028A/ko not_active Application Discontinuation
  • 2008-12-05 WO PCT/EP2008/010344 patent/WO2009071315A1/de active Application Filing
  • 2008-12-05 CN CN200880119499.0A patent/CN101889479B/zh active Active
  • 2008-12-05 JP JP2010535306A patent/JP5211293B2/ja not_active Expired - Fee Related
  • 2008-12-05 EP EP08858320A patent/EP2223569A1/de not_active Withdrawn
  • 2008-12-05 US US12/746,537 patent/US8593446B2/en active Active

Non-Patent Citations (2)

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