EP3503687A1 - Beleuchtungsvorrichtung und zugehöriges verfahren zur chromatischen kompensation - Google Patents

Beleuchtungsvorrichtung und zugehöriges verfahren zur chromatischen kompensation Download PDF

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Publication number
EP3503687A1
EP3503687A1 EP18211986.7A EP18211986A EP3503687A1 EP 3503687 A1 EP3503687 A1 EP 3503687A1 EP 18211986 A EP18211986 A EP 18211986A EP 3503687 A1 EP3503687 A1 EP 3503687A1
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EP
European Patent Office
Prior art keywords
light radiation
radiation sources
color temperature
sources
light
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
Application number
EP18211986.7A
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English (en)
French (fr)
Other versions
EP3503687B1 (de
Inventor
Luca Volpato
Matteo CALDON
Lorenzo Baldo
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.)
Osram GmbH
Osram SpA
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Osram GmbH
Osram SpA
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Publication of EP3503687A1 publication Critical patent/EP3503687A1/de
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light

Definitions

  • One or more embodiments may be applied to lighting devices using electrically-powered light radiation sources, for example, solid-state light radiation sources such as LED sources.
  • electrically-powered light radiation sources for example, solid-state light radiation sources such as LED sources.
  • CCT Correlated Color Temperature
  • This characteristic in practice, the possibility of adjusting the "color" of the white light emitted from the source) can be implemented using, for example, in an LED module, two (or more) LEDs with different CCT values and then mixing the emitted light radiations, giving rise to a combined radiation having the required CCT value.
  • a drawback of this solution lies in the fact that the obtainable CCT points or loci are (only) those lying on the segment that connects the points corresponding to the CCTs of the LEDs used on the CIE 1931 diagram.
  • the CIE 1931 diagram corresponds to the color space, defined in 1931 by the Commission Internationale de l'Eclairage, which is able to include all the colors visible to the human eye.
  • One or more embodiments aim to provide solutions for compensating the correlated color temperature (CCT) that are able to overcome the drawbacks outlined above.
  • CCT correlated color temperature
  • this object can be achieved thanks to a device having the characteristics referred to in the following claims.
  • One or more embodiments may concern a corresponding method.
  • an embodiment in the context of the present description indicates that a particular configuration, structure or characteristic described in relation to the embodiment is included in at least one embodiment.
  • sentences such as “in an embodiment”, which may be present at various points in the present description, do not necessarily refer to exactly the same embodiment.
  • particular configurations, structures or characteristics can be combined in any suitable way in one or more embodiments.
  • reference 10 indicates a lighting device comprising electrically-powered light radiation sources.
  • One or more embodiments may concern solid-state light radiation sources such as LED sources (to which constant reference will be made in the following present description for illustrative simplicity and without limiting intent).
  • the device 10 may comprise a substrate 12 (substantially similar to a Printed Circuit Board - PCB) of a planar shape, for example, elongated and ribbon-like.
  • Light radiation sources are arranged on the substrate 12, which can be mounted on the substrate with known techniques (for example with surface-mount technology techniques).
  • each of the three light radiation sources visible in Figure 1 comprising - in turn - a group of light radiation generators, e.g. LEDs arranged adjacent to each other with:
  • the (or each) group of generators visible in the figures also comprises a third light radiation generator 143 which emits light in the green region, and which is assigned a compensation function of the CCT of the light radiation resulting from mixing of the light radiations emitted by the generators 141, 142 and 143 as a consequence, for example, of the fact that the generators 141, 142 and 143 are arranged adjacent to each other.
  • the generator 143 can be a (small) LED generator interposed or placed on the support 12 between the generators 141 and 142 so that the radiations emitted by the generators 141, 142 and 143 are mixed together.
  • Figure 3 exemplifies the possibility (feasible by adjusting the relative intensities of the emissions of the generators 141, 142 and 143 - for example by intervening on the PWM drive modes of the generators) to move the point corresponding to the light radiation deriving from mixing the light radiations of the three generators 141, 142 and 143 at virtually any point of the curve BB between the points indicated with 141 and 142. In this way, it is possible to "cover" practically the entire CCT range between 2000 K and 4000 K, remaining at the BB curve.
  • Figures 6 and 7 exemplify the possibility of applying the solution presented in general terms with reference to Figure 1 to a lighting device 10 with driving of the generators 141, 142 and 143 "at constant voltage".
  • the lines CW (cold light), WW (warm light) and CC (CCT compensation) as well as a general LED+ power supply line can be connected to a controller 14.
  • This may be, for example, a three-channel PWM controller 14 supplied between a power supply voltage +V CC and a ground line GND.
  • Figure 7 illustrates a possible circuitry configuration in which the various generators 141 (cold light), 142 (warm light) and 143 (compensation) can be arranged (according to criteria known per se) in strings of generators connected in series with each other, which are associated with respective current regulators 1410, 1420 and 1430 interposed (therefore connected in series) with the generators of the respective strings.
  • the required CCT value for the light radiation resulting from the mixing can be achieved (with the corresponding compensation action carried out by the generators 143) by operating - according to criteria known per se - on the controller 14, which is able to perform a PWM modulation function of the current on the three channels operating, for example, between the LED+ terminal (common to the three channels) and with the three lines - WW, CW and CC - selectively connected to a reference value (conventionally definable as LED-) with required duty-cycle values so as to regulate the emission of each group of generators 141, 142 and 143 according to methods substantially corresponding to those exemplified by the diagrams of Figures 4 and 5 .
  • a solution as exemplified in Figures 6 and 7 , lends itself to being implemented both in the form of a source concentrated on a single board 12, for example, PCB, so as to act as a localized "light engine”, or in the form of a modular type source, for example, of elongated, rigid or flexible shape, for example, in the form of a so-called LED strip.
  • Figures 8 and 9 exemplify a so-to-speak "dual" solution, with “constant current” drive.
  • the light radiation generators 141, 142 and 143 can be arranged in strings with a common LED- terminal (see, for example, Figure 9 ) supplied, for example, by a drive unit once again indicated with 14.
  • the drive function can be implemented by means of a constant current driver CC or by an output of a constant current multichannel LED driver.
  • Figure 8 exemplifies the possible implementation of the device 10 in the form of a so-called light engine mounted on a single board (for example, PCB) 12, which is a solution frequently used in combination with a constant current drive.
  • PCB single board
  • Figures 10 to 12 exemplify the possibility of resorting to a solution according to one or more embodiments in a context such as that described in the Italian patent application no. 102017000095581 assigned to the same Assignees of the present application and not yet accessible to the public at the time of filing the present application.
  • This solution envisages the use of a first and a second set of light radiation generators having a "high" CCT (for example 4000 K, as in the example here referring to generators 141) and a lower CCT (for example 2000 K, as in the example here referring to generators 141), respectively.
  • a "high" CCT for example 4000 K, as in the example here referring to generators 141
  • a lower CCT for example 2000 K, as in the example here referring to generators 141
  • This solution aims to implement a "warm" dimming mechanism, for example, in the context of an LED module powered by constant voltage, for example, between LED+ and LED- voltages (see the diagram in Figure 11 ).
  • this operation mode corresponds to implementing the aforesaid warm-dimming action starting from the initial point SL of Figure 10 , that is to say, a point on the segment which connects points 141 and 142, at a certain distance from the curve of the black body BB, thus giving rise, in particular around temperature values in the order of 3000 K, to the effect of pinkish light at the highest brightness levels.
  • this can occur according to the modes shown in Figure 12 where it can be seen that, by operating on the string of compensation generators 143 (capable of being driven by the same turn-on delay circuit 16, intended to drive the radiation generators 141), it is possible to move the starting point of the warm dimming action from the point SL, exemplified in Figure 10 , to the point SL' of Figure 12 , i.e. to a point located on the curve of the black body BB.
  • the warm-dimming action can take place along a segment (the one connecting the point SL' with the point 142 in Figure 12 ) which, although in itself does not strictly follow the curve of the black body BB, is able to prevent the negative effects described above (pinkish light) in consideration of the fact that the segment that goes from the point SL' to the point 142 is closer to the curve of the black body BB compared to the segment that goes from the point SL to point 142.
  • a lighting device (e.g. 10) according to one or more embodiments may comprise:
  • One or more embodiments may comprise a plurality of groups of light radiation sources, with each group in the plurality of groups comprising at least one said first light radiation source, at least one said second light radiation source and at least one said third light radiation source.
  • said plurality of light radiation sources may comprise:
  • the driver circuit can be configured for:
  • said second color temperature can be lower than said first color temperature (e.g. 2000 K relative to 4000 K).
  • said light radiation sources may comprise solid-state light radiation generators, optionally LED generators.
  • a method for generating light radiation may comprise:
  • One or more embodiments may envisage adjusting the intensity of the third light radiation of green color by moving the color point of the mixed light radiation in the CIE 1931 diagram onto the black body emission curve (e.g. BB).
  • the black body emission curve e.g. BB

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP18211986.7A 2017-12-20 2018-12-12 Beleuchtungsvorrichtung und zugehöriges verfahren zur chromatischen kompensation Active EP3503687B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT201700147440 2017-12-20

Publications (2)

Publication Number Publication Date
EP3503687A1 true EP3503687A1 (de) 2019-06-26
EP3503687B1 EP3503687B1 (de) 2020-08-05

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EP18211986.7A Active EP3503687B1 (de) 2017-12-20 2018-12-12 Beleuchtungsvorrichtung und zugehöriges verfahren zur chromatischen kompensation

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116600437A (zh) * 2023-07-19 2023-08-15 深圳市美尚照明有限公司 一种快速调节色温色容差的led灯带及方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110273107A1 (en) * 2010-05-08 2011-11-10 Lightel Technologies Inc. Solid-state lighting of a white light with tunable color temperatures
WO2013036070A2 (en) * 2011-09-08 2013-03-14 Lg Innotek Co., Ltd. Lighting device and lighting control method
EP3122160A1 (de) * 2014-03-20 2017-01-25 Toshiba Materials Co., Ltd. Lichtemittierende vorrichtung und led-glühlampe
US20170181241A1 (en) * 2015-10-02 2017-06-22 Samsung Electronics Co., Ltd. White Light Emitting Module and LED Lighting Apparatus
WO2017182266A1 (en) * 2016-04-22 2017-10-26 Philips Lighting Holding B.V. A method of controlling a lighting arrangement, a lighting control circuit and a lighting system.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201247016A (en) * 2011-04-12 2012-11-16 Koninkl Philips Electronics Nv Apparatus, system and method for pulse width modulated lighting control
US9055643B2 (en) * 2013-03-13 2015-06-09 Cree, Inc. Solid state lighting apparatus and methods of forming

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110273107A1 (en) * 2010-05-08 2011-11-10 Lightel Technologies Inc. Solid-state lighting of a white light with tunable color temperatures
WO2013036070A2 (en) * 2011-09-08 2013-03-14 Lg Innotek Co., Ltd. Lighting device and lighting control method
EP3122160A1 (de) * 2014-03-20 2017-01-25 Toshiba Materials Co., Ltd. Lichtemittierende vorrichtung und led-glühlampe
US20170181241A1 (en) * 2015-10-02 2017-06-22 Samsung Electronics Co., Ltd. White Light Emitting Module and LED Lighting Apparatus
WO2017182266A1 (en) * 2016-04-22 2017-10-26 Philips Lighting Holding B.V. A method of controlling a lighting arrangement, a lighting control circuit and a lighting system.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116600437A (zh) * 2023-07-19 2023-08-15 深圳市美尚照明有限公司 一种快速调节色温色容差的led灯带及方法

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