EP2499883B1 - Led-leuchtvorrichtung und verfahren zum betreiben einer led-leuchtvorrichtung - Google Patents

Led-leuchtvorrichtung und verfahren zum betreiben einer led-leuchtvorrichtung Download PDF

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Publication number
EP2499883B1
EP2499883B1 EP11701785.5A EP11701785A EP2499883B1 EP 2499883 B1 EP2499883 B1 EP 2499883B1 EP 11701785 A EP11701785 A EP 11701785A EP 2499883 B1 EP2499883 B1 EP 2499883B1
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Prior art keywords
color
phase
color channels
during
measurement phase
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EP11701785.5A
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German (de)
English (en)
French (fr)
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EP2499883A1 (de
Inventor
Tobias Frost
Bakuri Lanchava
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Osram Beteiligungsverwaltung GmbH
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Osram Beteiligungsverwaltung GmbH
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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
    • H05B45/22—Controlling the colour of the light using optical feedback

Definitions

  • the invention relates to a method for operating an LED lighting device and an LED lighting device.
  • WO 2006/063552 A1 relates to a motor vehicle headlight element which has at least one light-emitting diode (LED) and at least one control device which is suitable for processing a signal that is dependent on a measured variable and for impressing a current corresponding to the signal in the light-emitting diode, the control device and the light-emitting diode on one common carrier are arranged.
  • LED light-emitting diode
  • control device which is suitable for processing a signal that is dependent on a measured variable and for impressing a current corresponding to the signal in the light-emitting diode, the control device and the light-emitting diode on one common carrier are arranged.
  • US 2004/0036418 A1 relates to a circuit and a method for providing a closed control loop using continuous current switching techniques.
  • LEDs light emitting diodes
  • a circuit has several high-side switches, each of which is connected to an LED array.
  • the LED arrays are connected via a coil to a power switching control point, which switches power to ground or feeds the power back in order to maintain an LED current flow in a desired area.
  • US 2006/0006821 A1 relates to a system and method for implementing an LED-based luminaire that contains one or more color channels.
  • the luminaire includes a controller that uses optical sensing and feedback to control LEDs in each channel to provide consistent luminosity and / or color output.
  • the luminaire controller likes the optical feedback loop Provide uniform luminosity and / or color of the luminaire output.
  • the controller may then set a current and / or a pulse width modulation (PWM) duty cycle, which separate color channels are fed to the luminaire in order to obtain the desired luminosity and / or color.
  • PWM pulse width modulation
  • US 2002/0097000 A1 relates to an LED luminaire system for providing power for LED light sources in order to provide a desired light color, which system has a power supply stage which is configured to provide a direct current signal.
  • a light mixing circuit is coupled to the power supply stage and includes a plurality of LED light sources of red, green and blue colors to produce light of various desired color temperatures.
  • a control system is coupled to the power supply stage and is configured to provide the power supply stage with control signals to maintain the DC signal at a desired level to the desired. Maintain light output.
  • the control system is further configured to estimate lumen output fractions associated with the LED light sources based on a transition temperature of the LED light sources and chromaticity coordinates of the desired light to be generated at the light mixing circuit.
  • the light mixing circuit further includes a temperature sensor for measuring the temperature associated with the LED light sources and a light detector for measuring a lumen output level of light generated by the LED light sources. Based on the measured temperatures, the control system determines the amount of output lumens that each of the LED light sources must produce in order to achieve the desired mixed light output, and the light detector in conjunction with a feedback loop maintains the required lumen output for each of the LED light sources.
  • the EP 1 898 677 A2 shows a color control for a luminaire in which only the light source to be measured and therefore the color to be measured is active during the measurement of a light source.
  • the publication WO 02/23954 A1 discloses a lamp with an array of red, green and blue light emitting diodes and a control system.
  • the control system is set up to operate the individual components in such a way that a desired color impression can be permanently maintained.
  • DE 10 2005 049 579 A1 relates to a light source that emits mixed-colored light that contains light at least two different colors that is emitted by a plurality of primary light sources, in which: the primary light sources are divided into groups and the brightness values of the primary light sources within a group are determined separately according to color and are controlled so that the color locus of the mixed-colored light lies in a predetermined range of the CIE standard color table. Furthermore, a method for controlling such a light source is specified, as well as a lighting device with such a light source, for example for backlighting a display.
  • the at least two color channels can also include different color channels of the same color.
  • Each color channel comprises one or more LEDs of the same color, e.g. connected in series or connected in parallel.
  • a portion or fraction of the light emitted by the (in particular all) LEDs is detected or sensed by means of the at least one photodetector, in particular a single photodetector.
  • the photodetector can comprise, for example, a photodiode or a phototransistor.
  • the operating phase corresponds to normal operation of the LED lighting device.
  • Color mixing or integral color mixing of the measurement phase can in particular be understood to mean an addition of the light emitted from the color channels during the measurement phase.
  • the order of the successively controlled color channels is fundamentally not restricted.
  • the order of the successively controlled color channels can be the same or different for several measurement phases.
  • the above method has the advantage that the luminous flux detected by the photodetector can be assigned unambiguously and with high accuracy to a specific color channel through the successive (sequential) control of the color channels. This eliminates the need for faulty separation or reconstruction of the luminous fluxes of the individual color channels. This can be used, for example, to determine a correlation between a current through a color channel and the luminous intensity or luminous flux of this color channel resulting therefrom. In this way, for example, a desired color location and / or a desired light intensity can be set or regulated more precisely during the operating phases.
  • a light emitted by the LEDs during the measurement phase has a color mixture which essentially corresponds to a color mixture of the operating phase, a color impression from the previous operating phase is continued at the same time, so that an observer cannot distinguish the measurement phase from the operating phase in terms of color and so the Measurement phase does not perceive as disturbing.
  • each color channel is controlled separately by means of a pulse width modulation so that a ratio of pulse widths of the color channels during the measurement phase essentially corresponds to a ratio of the pulse widths of the color channels during the operating phase.
  • the color impression that is the same as in the operating phase is thus achieved by setting a similar or the same pulse width, which is particularly easy to achieve.
  • a flow level is set separately for each of the color channels so that a ratio of current levels of the color channels during the measurement phase essentially corresponds to a ratio of the current levels of the color channels during the operating phase.
  • an amount of light during the measurement cycle is brought to a value by setting a current level at which a signal level or level of a sensor signal of the at least one photodetector is in a range between 75% and less than 100%, e.g. 99.5 %, of its maximum signal level.
  • a sufficiently high signal level with a high signal-to-noise ratio (SNR) can be achieved and, at the same time, saturation of the photodetector can be avoided.
  • the search algorithm can be, for example, a linear search algorithm.
  • a search algorithm can be used which works faster than the linear search algorithm, in particular a binary search algorithm or an interval search.
  • the level of the sensor signal may be desirable to reduce the level of the sensor signal if a lot of light is reflected back into the photodetector and / or irradiated from the surroundings. This can be the case, for example, when the LED lighting device a light mixer such as a diffuser, beam-shaping optics, etc. is connected downstream, which reflects a comparatively large amount of light. As a result, the photodetector can be saturated, so that in the measurement phase there is no longer any meaningful correlation between a control signal of a color channel and its luminous flux.
  • a light mixer such as a diffuser, beam-shaping optics, etc.
  • the measurement phase in addition to the step of activating the color channels, has a step of not activating all of the color channels. In this “dark phase”, an effect of ambient light incident on the LED lighting device on the sensor signal can be determined.
  • the measurement phase additionally has compensation sections, during which the color channels are controlled as during an operating phase.
  • the color channels can also be operated simultaneously during the compensation sections.
  • these measurements can be omitted or specifically shortened in subsequent measurement phases in order to reduce the time required for the measurement phase.
  • the error caused by the omitted measurements can be corrected, for example, by the compensation sections.
  • a measurement phase does not last longer than approx. 40 ms, in particular no longer than 20 ms, in particular no longer than 10 ms.
  • the duration of the measurement phase in which a color channel is activated can last as long as is necessary for the measurement value acquisition of the individual channels, that is, for example, even without a dark phase.
  • a period of time between two measurement phases is not constant.
  • a plurality of LED lighting devices in particular several times one behind the other, are simultaneously (collectively) in their measurement phase and thus reinforce a difference to an impression from an operating phase for a viewer.
  • This effect can be suppressed particularly effectively if a period of time between two measurement phases is non-deterministic, e.g. determined randomly or pseudo-randomly.
  • a sensor signal output by the at least one photodetector during the measurement phase is used, at least in sections, to adapt a control in a subsequent operating phase.
  • This can take the form of feedback, for example.
  • the result can be used to calculate and / or readjust the amount of light required to reach the color location in a control loop.
  • the dark phase is advantageous if one is provided. This results in a particularly fast measurement and thus a short measurement phase, which minimizes the risk of brightness fluctuations that are visible to the observer.
  • the switching device can, for example, be a functional part of a general control device of the LED lighting device.
  • the LED lighting device is set up to carry out a method as described above.
  • the first row off Fig. 1 shows an excerpt from a first control signal S1 for a first color channel Ch1 of an LED lighting device.
  • the first color channel Ch1 contains all light emitting diodes (LEDs) of a first color, for example red, which are controlled jointly by means of the common control signal S1.
  • the red light-emitting diodes of the first, red color channel Ch1 can be connected in series, for example.
  • the second row shows an excerpt from a second control signal S2 for a second color channel Ch2 of an LED lighting device.
  • the second color channel Ch2 contains all light emitting diodes (LEDs) of a second color, e.g. green, which are controlled by means of the common control signal S2.
  • the green light-emitting diodes of the second, green color channel Ch2 can be connected in series, for example.
  • the third row shows a section from a third control signal S3 for a third color channel Ch3 of an LED lighting device.
  • the third color channel Ch3 contains all light-emitting diodes (LEDs) of a third color, for example blue, which are controlled jointly by means of the common control signal S3.
  • the blue light-emitting diodes of the third, blue color channel Ch3 can be connected in series, for example.
  • Fig. 1 each shows simultaneous excerpts of the control signals S1, S2 and S3.
  • the sections each show a first operating phase BP1, which is followed by a measurement phase MP, which is followed by a second operating phase BP2.
  • a pulse in particular a current pulse, is applied to all three color channels Ch1, Ch2, Ch3 in an activation cycle, wherein a pulse width PB1, PB2, PB3 of the color channels Ch1, Ch2, Ch3 can differ.
  • the pulse width PB1, PB2, PB3 can be set by the LED lighting device and can, for example, be based on a desired color temperature. For example, a specific color or color location of the light emitted by the LED lighting device, e.g.
  • warm-white or cold-white can be assigned a specific ratio of the pulse widths PB1, PB2, PB3 and thus activation times of the color channels Ch1, Ch2, Ch3.
  • the pulse widths PB1, PB2 or PB3 can depend, for example, on the desired color location of the LED lighting device, the luminosity, the color and the number of LED (s) per color channel, etc.
  • the pulse widths PB1, PB2, PB3 can be varied, for example in order to change a color location and / or a light intensity of the mixed light.
  • the three color channels Ch1, Ch2, Ch3 can be controlled independently of one another, so that, for example, simultaneous control, in particular energization, of the three color channels Ch1, Ch2, Ch3 can be achieved particularly easily.
  • a sequential control can also be used in which no two color channels Ch1, Ch2, Ch3 are controlled at the same time.
  • color channels only two color channels may be used, e.g. with red LED (S) or mint green LED (s) to generate a white mixed light. More than three color channels can also be used, e.g. additionally with amber-colored LED (s) ('amber') to generate a warm-white mixed light.
  • a portion of the light emitted by the LEDs of the color channels Ch1, Ch2, Ch3 is captured by means of at least one photodetector.
  • the at least one photodetector is at least able to detect a luminous flux of the LEDs and output a corresponding sensor signal, e.g. to an evaluation logic of the LED control device.
  • the operating phase BP1 changes to the measurement phase MP at a point in time tm0 for all three color channels Ch1, Ch2, Ch3.
  • the three color channels Ch1, Ch2, Ch3 are controlled one after the other or sequentially and not contemporaneous.
  • a sensor signal of the at least one photodetector can be easily and unambiguously assigned to a specific color channel Ch1, Ch2, Ch3 and evaluated, for example for determining and / or setting the light intensity or the color location of the mixed light.
  • a time for activating the color channels Ch1, Ch2, Ch3 preferably does not last more than 40 ms, in particular not more than 20 ms, in particular not more than 10 ms. It is particularly preferred if the total duration tm of the measurement phase MP does not last more than 40 ms, in particular not more than 20 ms, in particular not more than 10 ms.
  • the color channels Ch1, Ch2, Ch3 are controlled in such a way that light emitted by the LEDs during the measurement phase has an integral color mixture, which is essentially one Color mix corresponds to the operating phase.
  • An integral color mixture can be understood to mean, in particular, an accumulation, in particular addition, of the light emitted by the LEDs during the measurement phase.
  • a ratio of the pulse widths PM1, PM2, PM3 of the color channels Ch1, Ch2, Ch3 during the measurement phase MP essentially corresponds to a ratio of the pulse widths PB1, PB2, PB3 of the color channels Ch1, Ch2, Ch3 during the operating phase BP1, even if whose absolute width or duration in the measurement phase MP and the previous operating phase BP1 need not match. Because of the inertia of the eyes, an observer then perceives the same color impression in the measurement phase MP as in the operating phase BP1.
  • the LED lighting device can use the sensor signals, for example for each of the color channels Ch1, Ch2, Ch3, to create a correlation between an associated control signal S1, S2, S3, for example a current, and a color-specific light intensity and if there is a deviation from a setpoint value, for example the light intensity, modify the control signal accordingly. For example, if it is determined that a light intensity for a specific color channel Ch1, Ch2, Ch3 is lower than a value of the light intensity stored for the pulse width PM1, PM2 or PM3 used, the pulse width PB1, PB2, PB3 for this color channel Ch1, Ch2, Ch3 are increased in a subsequent operating phase BP2.
  • a lower luminous intensity can be caused, for example, by aging of the LEDs, temperature effects or by failure of an LED.
  • the section for which the color channels Ch1, Ch2, Ch3 are sequentially controlled or activated is followed by an optional section during which none of the color channels is controlled or activated, a so-called dark phase DP.
  • a black value can be measured which, for example, takes into account ambient light radiated into the LED device, in particular the photodetector.
  • a switch is made to a second operating phase BP2, in which the control signals S1, S2, S3 can be modified in comparison to the control signals S1, S2, S3 of the first operating phase BP1 on the basis of knowledge gained from the measurement phase MP.
  • the time interval between two measurement phases MP can be predetermined, for example a measurement phase MP can be carried out every n activation cycles.
  • a measurement phase MP can be carried out every n activation cycles.
  • the measurement phases MP of the several LED lighting devices occur essentially at the same time or only slightly offset in time. A viewer can then possibly perceive these measurement phases MP collectively.
  • the time interval (duration) of two measurement phases MP of an LED lighting device can be non-deterministic, for example random or pseudo-random, in particular within a predetermined time interval.
  • Fig. 2 outlines an LED lighting device L which, among other things, has a control device T, in particular a driver, for operating light-emitting diodes LD1, LD2 and LD3.
  • the light-emitting diodes are divided into three strings, which correspond to a respective color channel Ch1, Ch2 or Ch3.
  • Each color channel contains one or more light-emitting diodes LD1, LD2 or LD3 of the same color, for example the color channel Ch1 the red light-emitting diodes LD1, the color channel Ch2 the green light-emitting diodes LD1 and the color channel Ch3 the blue light-emitting diodes LD3.
  • the color channels Ch1, Ch2 and Ch3 can be controlled separately or individually by means of the control device T.
  • the color channels Ch1, Ch2 and Ch3 can, for example, contain the light-emitting diodes LD1, LD2 and LD3 in a series connection.
  • An LED LD1, LD2, LD3 can be understood as an individually housed LED or an LED chip.
  • Light-emitting diodes LD1, LD2, LD3 designed as LED chips can for example be arranged on a common substrate.
  • the LEDs LD1, LD2, LD3 can be, for example, inorganic LEDs, e.g. with InGAIP, or organic LEDs (OLEDs).
  • a signal output of the photodetector D is functionally connected to the control device T, where a sensor signal output via the signal output is evaluated can be.
  • the sensor signal of the photodetector D can be used, for example, to to regulate the currents that flow through the color channels Ch1, Ch2 and Ch3 in such a way that a setpoint value of a luminous flux can be maintained.
  • the photodetector D cannot be used in the operating phase BP1, BP2.
  • the measurement phase MP can be used for calibrating the LED lighting device L. For example, a correlation between a current through a color channel Ch1, Ch2 and Ch3 and the resulting light intensity or luminous flux of this color channel Ch1, Ch2 or Ch3 can be determined. In this way, in turn, a desired color location and / or a desired light intensity can be set or regulated more precisely during the operating phases BP1, BP2.
  • the control device T can functionally comprise a switching device for switching the LED lighting device from the operating phase BP1, BP2 into the measurement phase MP and back, as well as a measurement phase sequence control.
  • a current-level-modulated or current-intensity-modulated control of the color channels can also take place.
  • the color channels can then each be operated in continuous operation, with their light intensity being able to be set via a current level or current level of an operating current impressed on the respective color channel.
  • the color channels can be controlled one after the other with the same current strength or current level as in the operating phase, with different color channels can then preferably also be activated for the same length of time for a color impression that is uniform in relation to the operating phase. This also enables a particularly short measurement phase.
  • PWM control of the color channels with variable current levels is possible, i.e. PWM control in which the current level or current intensity can also be varied.
  • a current level can be set (with or without PWM control), it can also be varied during the measurement phase in order to optimize the sensor signal of the at least one photodetector.
  • the current level for this color channel can be increased until the sensor signal has a has lower noise error or a higher SNR.
  • the current level can also be reduced in the event that a light current incident on the at least one photodetector is comparatively high and is in particular in the saturation range of the at least one photodetector.
  • the luminous flux here is already so high that the photodetector is saturated and if the luminous flux is increased further, its sensor signal is no longer amplified.
  • An indication that the photosensor is being operated above its saturation limit is the presence of a maximum sensor signal, e.g. a maximum sensor voltage.
  • the current level of the color channel can be reduced until the associated sensor signal is in a range between a value just below the maximum sensor signal (as the upper limit) and above a value with an already favorable SNR. It has proven to be advantageous that the current level of the color channel is reduced until the associated sensor signal is in a range between 50% and below, in particular 99.5%, of the maximum sensor signal, in particular between 75% and below, in particular 99.5%, of the maximum sensor signal.
  • the search for a favorable sensor area can be carried out using any suitable search algorithm.
  • a linear search algorithm can be carried out in which the current level is increased step-by-step (linearly) (if the sensor signal is initially too weak) or decreased (if the sensor signal is initially too strong or saturated).
  • Such a search algorithm has (in Landau notation) a complexity class O (n).
  • An even faster adaptation e.g. with the complexity class O (log n)
  • can be achieved using other search algorithms e.g. a binary search algorithm or an interpolation search or an interval search.
  • the order of the color channels activated one after the other is basically not restricted.
  • the sequence can be the same for several measurement phases (eg always Ch1, Ch2, Ch3) or differ (eg Ch1, Ch2, Ch3 for one measurement phase and, for example, Ch3, Ch1, Ch2 for another measurement phase).
  • the sequence is preferably chosen so that the measurement phase is as short as possible.
  • the power sources that are commonly used, this is particularly the case when the color channels are controlled one after the other in the measuring phase in descending order of brightness, i.e. first the color channel with the greatest brightness, then the one with the second largest, etc. up to the channel with the lowest brightness , since the usual power sources require considerably more time for a power increase than for a power decrease.
  • the dark phase is advantageous if one is provided is. This results in a particularly fast measurement and thus a short measurement phase, which minimizes the risk of brightness fluctuations that are visible to the observer. If a power source is used that reacts faster when rising than when falling, a measurement in the reverse order, ie from the darkest to the lightest color channel, is of course advantageous.
  • each of the color channels can be activated once or several times in a measurement phase.
  • at least one of the channels can be activated twice in a measurement phase;
  • the red, green and blue color channels can be activated twice in a measurement phase, for example in the order Ch1, Ch2, Ch3, Ch1, Ch2, Ch3.
  • the control signals for the color channels can follow one another directly or be spaced apart in time.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Spectrometry And Color Measurement (AREA)
EP11701785.5A 2010-02-12 2011-01-20 Led-leuchtvorrichtung und verfahren zum betreiben einer led-leuchtvorrichtung Active EP2499883B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102010001889 2010-02-12
DE102010028406A DE102010028406A1 (de) 2010-02-12 2010-04-30 LED-Leuchtvorrichtung und Verfahren zum Betreiben einer LED-Leuchtvorrichtung
PCT/EP2011/050781 WO2011098334A1 (de) 2010-02-12 2011-01-20 Led-leuchtvorrichtung und verfahren zum betreiben einer led-leuchtvorrichtung

Publications (2)

Publication Number Publication Date
EP2499883A1 EP2499883A1 (de) 2012-09-19
EP2499883B1 true EP2499883B1 (de) 2021-10-06

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US (1) US9392664B2 (ja)
EP (1) EP2499883B1 (ja)
JP (1) JP2013519970A (ja)
CN (1) CN102754526B (ja)
DE (1) DE102010028406A1 (ja)
WO (1) WO2011098334A1 (ja)

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DE102010028406A1 (de) 2011-08-18
US9392664B2 (en) 2016-07-12
US20120306379A1 (en) 2012-12-06
WO2011098334A1 (de) 2011-08-18
CN102754526B (zh) 2015-09-30
EP2499883A1 (de) 2012-09-19
JP2013519970A (ja) 2013-05-30
CN102754526A (zh) 2012-10-24

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