• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a device for producing white light whose color temperature can be adjusted, the device comprising: a first LED light source (1) for generating a first light of a first color, the first color being defined by a first white color locus ( 7), a second LED light source (2) for generating a second light of a second color, the second color being characterized by a second white color locus (8) different from the first white color locus (7), and a third LED light source (3) for generating a third light of a third color, the third color being characterized by a third white color locus (9) extending from both the first white color location (7) and the second white color space (3) Color location (8) is different. By appropriate brightness control of the three LED light sources, a mixed light can be generated, the color point is virtually arbitrarily exactly on the black body curve (5).
    公开号:AT14890U1
    申请号:TGM9002/2013U
    申请日:2013-04-25
    公开日:2016-08-15
    发明作者:Katharina Keller
    申请人:Zumtobel Lighting Gmbh；
    IPC主号:
    专利说明:

    description
    ARRANGEMENT FOR GENERATING WHITE LIGHT WITH ADJUSTABLE COLOR TEMPERATURE THROUGH THREE WHITE LIGHT LEDS
    The invention relates to an arrangement for generating white light with adjustable color temperature on LED basis (LED: light-emitting diode).
    Moreover, the invention relates to a method for controlling such an arrangement.
    To produce white light with adjustable color temperature based on LEDs, an arrangement with three LEDs is known, in which the first LED emits a red light, the second LED a green light and the third LED a blue light. The arrangement is designed in such a way that the differently colored lights of the LEDs subsequently more or less mix, so that-viewed from the usual distance-a mixed light is seen that appears white. The intensities of the three LEDs can be changed independently of each other, so that the color of the mixed light can be adjusted in this way. Are in the well-known CIE Standardfarbtafel 1931 (CIE: Commission international de l'eclairage) - hereinafter also briefly "standard color chart" - the three color locations that correspond to the three colors used red, green and blue, registered and connected to each other in a straight line, so that a triangle is formed, the color location of the mixed light lies within this triangle anyway.
    However, it is associated with considerable effort to make the arrangement such that the mixture of colors is so complete that when viewing the arrangement no disturbing colored spots are recognizable. Frequently, a corresponding arrangement on a light emitting surface on which forms an unwanted, non-white colored light phenomenon. A white light that meets particularly high requirements, can be realized with such an arrangement hardly or only with great effort.
    Alternatively, it is known to mix the light of two white light LEDs together to produce an adjustable white light, wherein the intensities of the two white light LEDs are set differently to set the color temperature. On the standard color chart, the color location of the mixed light thus formed lies on the connecting straight line of the two color locations which correspond to the two white-light LED light sources. However, in this case, there is the problem that at certain mixing ratios of the intensities of the two LED light sources, a mixed light of a color is produced whose color location deviates so much from the blackbody curve that this mixed light no longer appears white to a normal viewer, but for example pink. This is because in the standard color chart the blackbody curve is not straight, but arcuate.
    The invention has for its object to provide a corresponding improved arrangement for generating white light. In particular, with the arrangement, a white light with adjustable color temperature should be specified, which appears over the entire adjustment range as pure white light. In addition, a method for controlling such an arrangement is to be specified.
    This object is achieved according to the invention with the objects specified in the independent claims. Particular embodiments of the invention are indicated in the dependent claims.
    According to the invention there is provided an arrangement for producing white light whose color temperature can be adjusted, the arrangement comprising: a first LED light source for producing a first light of a first color, the first color being defined by a first white color Color locus is characterized, a second LED light source for generating a second light of a second color, wherein the second color is characterized by a second white color location, which differs from the first white color location, and a third LED light source for generating a third light a third color, wherein the third color is characterized by a third white color location that differs from both the first white color location and the second white color location.
    By using the third LED light source can be achieved that with the arrangement by appropriate brightness control of the three LED light sources adjustable in its color temperature mixed light can be generated, whose color coordinates are virtually any exactly on the blackbody curve.
    Furthermore, the arrangement has a control unit for controlling the first LED light source, the second LED light source and the third LED light source, which is designed to independently control the intensities of the three LED light sources, in each case, that each of the three LED light sources is not operated at less than 10% of their maximum power. In other words, the control unit is designed such that with it the intensities of the three LED light sources can be regulated independently of each other, but only between 10% and 100% of the maximum power of the respective LED light source.
    The latter is advantageous in the following respect: For controlling the intensities of LED light sources, two different methods are known, namely a first method in which the amplitude of the current or the current is changed, "analog dimming" and a second Method, the so-called "PWM dimming" (PWM: pulse width modulation). When analog dimming to less than 10%, there may be a color change, which then affects the achievement of the desired mixed light or total light output. And a PWM dimming to less than 10% can only be achieved with relatively high effort. By "controlling the LED light sources to at least 10%", the accuracy of the light output with respect to the color locus setting of the mixed light can thus be improved while avoiding great control expense.
    Preferably, the arrangement is designed such that the first white color location of the color corresponds to warm white, the second white color location of the color cold white and the third white color point of the color neutral white. This choice makes it possible to achieve that the mixed light has a comparatively high color rendering index (CRI), even if the individual LED light sources as such each have a comparatively low color rendering index. In this way, the LED light sources can be manufactured with relatively low production costs, so that the arrangement can be made more cost-effective overall. For example, even in the case where the "cool white LED light source" has a comparatively low color rendering index, a color rendering index of, for example, 80 can be obtained for the mixed light, that is, a relatively high or good color rendering index.
    Preferably, the arrangement is such that the third white color location with respect to the blackbody curve in the CIE standard color chart is located on the side opposite to the purple line. Further preferably, the arrangement is configured such that the first white color locus and / or the second white color locus with respect to the blackbody curve are arranged in the CIE standard color chart on the side opposite to the purple line. This makes it possible to achieve, with relatively high efficiency, the three lights produced by the LED light sources corresponding to the vertices of a triangular color locus area in the CIE standard color chart, which includes a relatively large part of the blackbody curve.
    Further preferably, the arrangement is such that, with respect to the blackbody curve in the CIE standard color chart, the connecting line between the first white color locus and the second white color locus intersects the blackbody curve at a first interface and at a second interface wherein the first interface is within a first portion and the second interface is within a second portion of the blackbody curve. In this case, preferably the first section extends from 2600 K to 3300 K, in particular from 2800 K to 3100 K and the second section from 5000 K to 7000 K, in particular from 5500 K to 6500 K. In this way, can be particularly well an area of Blackbody curve, which is particularly relevant for the practice.
    In this case, the arrangement is also particularly advantageously designed such that the distance between the first interface and the second interface is at least three times and at most ten times the distance between the first interface and the first white color locus, preferably at least four times and at most eight times and / or that the distance between the first interface and the second interface is at least three times and at most ten times the distance between the second interface and the second white color location, preferably at least four times and at most eight times. In this way it can be achieved that the color location of the mixed light can be set practically over the entire section of the blackbody curve within the triangular color locus area when the first LED light source and the second LED light source each occupy at least 10% of their power operate.
    Preferably, the arrangement is further configured such that, with respect to the CIE standard color chart, the third white color location is located within a range defined by the x-coordinate interval of 0.380 ± 0.005 and the y-coordinate interval of 0.390 ± 0.005 is. This design is particularly advantageous with respect to the third LED light source with reference to the "controlling the LED light sources to at least 10%".
    Advantageously, the control unit is adapted to regulate the three intensities respectively by changing the amperage.
    In addition, the control unit is preferably adapted to a total intensity, which is composed of the three intensities and the intensity of the mixed light - to regulate by a PWM dimming.
    According to a further aspect of the invention, a method for driving an arrangement according to the invention is provided, comprising the following step: controlling the three intensities of the first LED light source, the second LED light source and the third LED light source such that the mixed light formed by the first light, the second light and the third light has a color whose color locus lies on the blackbody curve. The three mentioned LED light sources are controlled in such a way that they are always operated with at least 10% of their maximum power.
    Preferably, the current intensities are varied by the said LED light sources to control the three intensities. The setting of the color locus of the mixed light is thus preferably carried out by analog dimming the LED light sources.
    The adjustment of the brightness of the mixed light is advantageously carried out by a PWM dimming.
    The invention will be explained in more detail below with reference to an embodiment and with reference to the drawings. 1 shows a sketch of a plan view of an arrangement according to the invention, FIG. 2 shows the known CIE standard color chart 1931 with the black body curve, [0025] FIG. 3 shows a section from the standard color chart and [0026 ] Fig. 4 shows a further section of the standard color chart.
    In Fig. 1 is a schematic plan view of an embodiment of an inventive arrangement outlined. The arrangement comprises a first LED light source 1, a second LED light source 2 and a third LED light source 3. The first LED light source 1 may in particular consist of one LED or of several LEDs, the same applies to the second LED light source 2 and the third LED light source 3.
    The first LED light source 1 is designed to produce a first light of a first color, the second LED light source 2 for generating a second light of a second color and the third LED light source 3 for generating a third light of a third color.
    The LED light sources 1, 2, 3 may be arranged on a common board 4. The three LED light sources 1, 2, 3 are preferably arranged very close to one another, so that even at a small distance a mixed light results, which is composed of the first light, the second light and the third light. For example, the arrangement may be designed such that the distances between the LED light sources 1, 2, 3 are not greater than the diameter thereof.
    In Fig. 2, the well-known CIE standard color chart from 1931 is sketched. The horseshoe-shaped spectral color line 4, the blackbody curve 5 and the purple line 6 are marked, for example. On the blackbody curve 5, some temperatures of the corresponding blackbody emitters are given by way of example. The black body curve 5 is not straight, but arcuate, wherein it is curved with respect to the purple line 5 to the outside. Each color location in the standard color chart is known to be uniquely identified by an x coordinate and a y coordinate.
    The first color - that is, the color of the first light, which is generated by the first LED light source 1 - is characterized by a first white color location 7. The second color is characterized by a second white color locus 8 and the third color by a third white color locus 9. The second white color locus 8 differs from the first white color locus 7 and the third white color locus 9 differs from both the first white color locus 7, as well as the second white color location 8. In this case, the three named color locations 7, 8, 9 are not in line. As exemplarily shown, the third color locus 9 is preferably located on the side opposite to the purple line 6 with respect to a connecting line between the first color locus 7 and the second color locus 8.
    The LED light sources 1, 2, 3 may be, for example, LED light sources which generate a blue light or UV radiation which is subsequently influenced by a phosphor layer, so that a total of a corresponding White light is formed. This is known per se, so that will not be discussed here at this point.
    In Fig. 3, a section of the standard color chart is sketched, which shows the three white color locations 7, 8, 9 in more detail. The three color locations 7, 8, 9 are each connected in a straight line, so that a triangular Farbort areal is limited, in which the color location of the mixed light, which is composed of the first light, the second light and the third light, anyway must be located. It can be seen that in the example shown, the blackbody curve 5 runs approximately between 2900 K and 5900 K within this color location area. This is a relatively further and, with respect to the lighting technology, practice-relevant section of the black-body curve 5.
    As can be seen by way of example from FIGS. 2 and 3, all three color loci 7, 8, 9 are located relatively close to the blackbody curve 5, in particular such that no light is generated by any of the LED light sources 1, 2, 3 which, in the case of a normal observer, produces a color impression of a "colorful" color.
    As further shown by way of example in FIG. 2, in the example shown, all three color loci 7, 8, 9 with respect to the black body curve 5 lie on the side opposite to the purple line 6.
    FIG. 4 shows a further detail from the standard color chart, wherein a warm white area WW, a cold white area CW and a neutral white area NW are shown. The color loci within the warm white area WW are referred to here as "warm white", corresponding to the color locations within the cold white area CW as "cool white" and those within the neutral white area NW as "neutral white".
    The three areas mentioned WW, CW, NW are each quadrangles in the standard color chart.
    The following table shows the x and y coordinates of the vertices of these quadrilaterals in the standard color chart:
    Preferably, the design is such that the first white color location 7 lies within the warm white area WW, the second white color location 8 within the cold white area CW and the third white color location 9 within the neutral white area NW.
    More preferably, the first white color locus is within the range x = 0.465 ± 0.005; y = 0.420 ± 0.005, the second white color location within the range x = 0.310 ± 0.005; y = 0.325 ± 0.005 and the third white color locus 9 within the range x = 0.380 ± 0.005; y = 0.390 ± 0.005.
    In Fig. 3 is - as part of the boundary of the above-mentioned triangular color site area - the connecting line 11 between the first white color location 7 and the second white color location 8 located. It can be seen that this connecting line 11 intersects the black-body curve 5 at two points, namely at a first interface 12 and at a second interface 13. The first interface 12 lies in particular within a first section of the blackbody curve 5. which extends from 2600 K to 3300 K, preferably from 2800 K to 3100 K, the second interface 13 within a second section extending from 5000 K to 7000 K, preferably from 5500 K to 6500 K.
    The first color locus 7 lies at a certain distance from the first interface 12 and the second color locus 8 at a certain distance from the second interface 13. This is advantageous because in this way to form an adjustable mixed light, the color locus itself on the blackbody curve 5, the first LED light source 1 and the second LED light source 2 need not be dimmed to zero or approximately zero. In particular, the first color location 7 and the second color location 8 are selected such that the above-described "controlling the LED light sources to at least 10%" for all possible color locations along the blackbody curve 5 - in this case approximately between 2900 K and 5900 K. - can be realized.
    Specifically, in this context, the arrangement may be designed such that the distance between the first interface 12 and the second interface 13 is at least three times and at most the tooth of the distance between the first interface 12 and the first white color location 7, preferably at least four times and at most eight times. Similarly, preferably the distance between the first interface 12 and the second interface 13 is at least three times and at most ten times the distance between the second interface 13 and the second white color location 8, preferably at least four times and at most eight times.
    The arrangement further has a - schematically sketched in Fig. 1 - control unit 10 for driving the first LED light source 1, the second LED light source 2 and the third LED light source 3, wherein the arrangement is designed such that with the control unit 10, the intensities of said LED light sources 1, 2, 3 can be controlled independently of each other. As a result, with the three LED light sources 1, 2, 3 a mixed light can be generated, which is composed of the first light, the second light and the third light, such that the mixed light has a color which is characterized by a color locus, the - practically arbitrarily exactly - is on the black body curve 5, so to speak, "pure" white light. For example, the control unit 10 may be adapted to the color location on the
    Adjust Blackbody Curve 5 within the accuracy of a MacAdam ellipse (or "1-step MacAdam ellipse"). In this way it can be reliably ruled out that the mixed light has a pink-colored or greenish tint. For comparison, a "4-step MacAdam ellipse" is drawn around the color locus at 4000 K on the blackbody curve 5 in FIG. 3 (ie, a larger ellipse than a "1-step MacAdam ellipse").
    The control unit 10 is designed such that with it the intensities of the three LED light sources 1, 2, 3 can only be regulated between 10% and 100%.
    For driving accordingly, a method is provided, comprising the following step: controlling the intensities of the first LED light source 1, the second LED light source 2 and the third LED light source 3 such that the first light , the mixed light formed of the second light and the third light has a color whose color locus lies on the blackbody curve 5, in particular within the scope of the accuracy of a MacAdam ellipse. The mentioned LED light sources 1, 2, 3 are controlled such that they are always operated with at least 10% of their power.
    For controlling the three intensities, the current intensities are preferably varied by the mentioned LED light sources 1, 2, 3.
    The desired brightness of the mixed light is advantageously controlled by means of PWM dimming.
    The above description refers to the case where the arrangement has the three LED light sources 1, 2, 3 mentioned. Of course, the arrangement may also have more than three LED light sources, namely at least one first LED light source, at least one second LED light source and at least one third LED light source, wherein the at least one first LED light source in their features of the first described above LED light source 1 corresponds to the at least one second LED light source of the above-described second LED light source 2 and the at least one third LED light source of the third LED light source 3 described above.
    权利要求:
    Claims (12)
    [1]
    claims
    An arrangement for producing white light whose color temperature can be adjusted, comprising - a first LED light source (1) for generating a first light of a first color, the first color being characterized by a first white color locus (7), a second LED light source (2) for generating a second light of a second color, the second color being characterized by a second white color location (8) different from the first white color location (7); a third LED light source (3) for producing a third light of a third color, wherein the third color is characterized by a third white color locus (9) different from both the first white color locus (7) and the second white color locus (8) and - a control unit (10) for driving the first LED light source (1), the second LED light source (2) and the third LED light source (3), which is adapted to the intensities of the three LED Li Each of the three LED light sources (1, 2, 3) is not operated with less than 10% of their maximum power.
    [2]
    2. Arrangement according to claim 1, which is designed such that the first white color location (7) corresponds to the color warm white, the second white color location (8) of the color cold white and the third white color location (9) of the color neutral white.
    [3]
    An arrangement according to claim 1 or 2, which is arranged such that the third white color locus (9) with respect to the blackbody curve (5) in the CIE standard color chart is disposed on the side opposite to the purple line (6) ,
    [4]
    4. Arrangement according to one of the preceding claims, which is designed such that the first white color locus (7) and / or the second white color locus (8) with respect to the blackbody curve (5) in the CIE standard color chart on the, the purple line (6) opposite side are arranged.
    [5]
    5. Arrangement according to one of the preceding claims, which is designed such that with respect to the black body curve (5) in the CIE standard color chart, the connecting line (11) between the first white color location (7) and the second white color location (8 ) intersecting the blackbody curve (5) at a first interface (12) and at a second interface (13), wherein the first interface (12) lies within a first portion and the second interface (13) within a second portion the first section preferably extends from 2600 K to 3300 K, in particular from 2800 K to 3100 K, and the second section from 5000 K to 7000 K, in particular from 5500 K to 6500 K.
    [6]
    6. Arrangement according to claim 5, which is designed such that the distance between the first interface (12) and the second interface (13) at least three times and at most ten times the distance between the first interface (12) and the first white color location (7) is, preferably at least four times and at most eight times and / or that the distance between the first interface (12) and the second interface (13) at least three times and at most ten times the distance between the second interface (13) and the second white color location is (8), preferably at least four times and at most eight times.
    [7]
    7. Arrangement according to one of the preceding claims, designed in such a way that, with reference to the CIE standard color chart, the third white color locus (9) is arranged within a range defined by the x-coordinate interval 0.380 ± 0.005 and the y-coordinate. Coordinate interval y = 0.390 ± 0.005.
    [8]
    8. Arrangement according to one of the preceding claims, wherein the control unit (10) is adapted to control the three intensities respectively by changing the current intensity.
    [9]
    9. Arrangement according to one of the preceding claims, wherein the control unit (10) designed to control a total intensity, which is composed of the three intensities, by a PWM dimming.
    [10]
    10. A method for driving an arrangement according to one of the preceding claims, comprising the following step: controlling the three intensities of the first LED light source (1), the second LED light source (2) and the third LED light source (3) in such a way in that the mixed light formed by the first light, the second light and the third light has a color whose color locus lies on the black body curve (5), the three said LED light sources (1, 2, 3) being driven in such a way that that they are always operated with at least 10% of their maximum power.
    [11]
    11. The method of claim 10, wherein the current intensities are varied by the said LED light sources (1,2, 3) for controlling the three intensities.
    [12]
    12. The method of claim 10 or 11, wherein a desired brightness of the mixed light is controlled by means of PWM dimming. 4 sheets of drawings
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    法律状态:
    2020-12-15| MM01| Lapse because of not paying annual fees|Effective date: 20200430 |
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