EP2772120A1 - Atténuation de moyens d'éclairage par modulation d'impulsions en largeur pwm - Google Patents

Atténuation de moyens d'éclairage par modulation d'impulsions en largeur pwm

Info

Publication number
EP2772120A1
EP2772120A1 EP12810032.8A EP12810032A EP2772120A1 EP 2772120 A1 EP2772120 A1 EP 2772120A1 EP 12810032 A EP12810032 A EP 12810032A EP 2772120 A1 EP2772120 A1 EP 2772120A1
Authority
EP
European Patent Office
Prior art keywords
pulse
pulse width
width modulated
brightness
dimming
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
EP12810032.8A
Other languages
German (de)
English (en)
Other versions
EP2772120B1 (fr
Inventor
Eduardo Pereira
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.)
Tridonic GmbH and Co KG
Original Assignee
Tridonic GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tridonic GmbH and Co KG filed Critical Tridonic GmbH and Co KG
Publication of EP2772120A1 publication Critical patent/EP2772120A1/fr
Application granted granted Critical
Publication of EP2772120B1 publication Critical patent/EP2772120B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits

Definitions

  • the invention relates to a method for controlling an electrical load, preferably for dimming a light source, by supplying the consumer with a series of pulses whose pulse width is variable, for example, in discrete steps.
  • the invention also relates to a method for adjusting a color location. ⁇
  • DALI Digital Addressable Lighting Interface
  • the control unit transmits digital control signals, which are converted on the receiver side into discrete analogue dimming values and then processed into a pulse train whose pulses are then pulse width modulated in accordance with the discrete analogue dimming values.
  • microprocessors For the conversion of the digital control signals first into discrete analogue dimming values and then into pulse-width modulated pulses, microprocessors are used which, for reasons of price, generally work only at a rate of 10 to 12 bits.
  • the problem may arise that the corresponding required color value can not be set by the existing hardware stable and without side effects such as noise generation.
  • the invention is based on the object to improve a method for dimming or controlling an electrical load.
  • the invention has for its object to propose a stable setting of a required color value or brightness value, so as to prevent side effects such as noise generation.
  • the object of the invention is characterized by the features of
  • a method for dimming at least one luminous means such as LED or OLED, which is operated with a pulse width modulated current.
  • the duty cycle and / or the amplitude of the pulse width modulated current is / are adjustable depending on a desired color intensity or brightness of the light source.
  • At least one pulse of the pulse width modulated current is omitted or omitted.
  • pulses are selectively merged.
  • the at least one pulse can be omitted in such a way that the lighting means is a current that is constantly controlled or regulated on a time average to reach the current desired color intensity or brightness is provided.
  • the at least one pulse may be omitted such that the desired color intensity or brightness of the illuminant is achieved and at the same time the duty cycle or the amplitude of the pulse width modulated current remains greater than a minimum value, the minimum value for the duty cycle preferably half of the maximum possible Duty cycle is.
  • a duty cycle or amplitude designed / designed to achieve the desired color intensity or brightness of the light source is determined. If the determined duty cycle or amplitude is less than a minimum value, the desired color intensity or brightness of the light source is achieved such that the duty cycle or the amplitude is increased at least to the minimum value and at least one pulse of the pulse width modulated current is omitted.
  • the pulse-width-modulated current may have pulses periodically.
  • at least one pulse of the pulse width modulated current can be omitted.
  • the dimming ranges can be adjusted by dimming default value. be defined the desired color intensity or brightness of the bulb.
  • the dimming default values may be greater in the first dimming range than in the second dimming range.
  • There are at least two, preferably differing in their color rendering or in their color spectrum bulbs groups by means of a respective pulse width modulated current are independently dimmable.
  • pulses of different pulse-width-modulated currents for respective groups of lamps are offset in time or not at the same time.
  • a pulse of one of the different pulse width modulated currents is omitted, a pulse of the other pulse width modulated currents can be omitted at the same time, wherein preferably then the duty cycle of all pulse width modulated currents is increased. If different groups of lamps are controlled by different pulse width modulated currents, it may in fact happen that not all pulse width modulated currents would fall below the minimum duty cycle value. Nevertheless, a pulse can be omitted at the same time in all pulse width modulated currents.
  • Every nth pulse can be omitted.
  • the duty cycle or the amplitude of the pulse-width-modulated current can preferably be increased by the factor n / (nl).
  • the duty cycle or the amplitude can be increased to a minimum value.
  • pulses of the pulse width modulated current corresponding to the color intensity or brightness can be omitted.
  • At least one pulse is periodically omitted. In two successive periods, this at least one pulse is omitted at the same time or preferably at random or quasi-randomly determined different times.
  • the pulse width modulated current can be generated by a supply unit controlled by a corresponding pulse width modulated control signal such that the pulse width modulated control signal defines the pulse sequence of the pulse width modulated current.
  • the frequency of the pulse-width-modulated current may preferably be selected to be so high that, due to the omission of pulses, any flickering of the brightness of the light emitted by the illuminant is no longer perceived by the inertia of the human eye.
  • the frequency of the pulse width modulated current may preferably be chosen higher than 200 Hz.
  • the dimming default value can be digital.
  • a method for setting a color location or a color intensity in a dimming control of an electrical consumer, preferably one
  • Illuminant such as LED or OLED.
  • the luminous means has at least one, preferably two independently controllable, different in their color rendering or in their color spectrum
  • the lamp is driven with PWM signals preferably adjustable in discrete steps duty cycle.
  • PWM signals preferably adjustable in discrete steps duty cycle.
  • a combined PWM signal is generated, to which then one or more subsequent PWM signals are omitted accordingly.
  • the PWM signals may be the aforementioned pulse width modulated current or the aforementioned pulse width modulated control signal or a pulse of the aforementioned pulse width modulated current or the aforementioned pulse width modulated control signal.
  • a method for operating at least one dimmable luminous means comprising the steps:
  • the desired color intensity or brightness is achieved such that the duty cycle or the amplitude is increased at least to the minimum value and pulses of the PWM signal are omitted.
  • a method for operating at least one dimmable luminous means comprising the steps:
  • a amplitude of the pulse-modulated current designed to achieve a desired color intensity or brightness of the luminous means is determined
  • the desired color intensity or brightness is achieved such that the amplitude is increased to at least the minimum amplitude and that pulses of the PWM signal are omitted.
  • an integrated circuit in particular ASIC, microprocessor or hybrid thereof, which circuit is designed to carry out such a method.
  • a dimmable operating device for lighting means in particular LEDS or OLEDs, comprising such a circuit.
  • a lighting module comprising lighting means, in particular LEDs or OLEDs, and such a control gear.
  • a method for dimming control of an electrical load preferably a light source, such as, for example, LED or OLED.
  • This aspect relates to a method for adjusting a color locus in a dimming control of an electrical load, preferably a light source, such as LED or OLED, wherein the light source has at least two independently controllable light source groups, which differ in their color reproduction or in their color spectrum,
  • the luminous means is driven with PWM signals with a duty cycle which can be set in discrete steps
  • a summed PWM signal can be generated when the pulse width of a PWM signal is less than half the maximum possible pulse width of a PWM signal.
  • the combined PWM signals can be output offset from each other, so that at the same time to a omitted PWM signal for a group of bulbs, a summarized PWM signal for another group of bulbs is generated.
  • the position of the combined PWM signals or the PWM pulses within the group can be changed periodically or randomly, for example in order to reduce resonances.
  • the dimming preset value can be digital. This can be resolved over a dimming range into a higher number of steps than the number of steps provided for the change of the duty cycle.
  • the frequency of the PWM pulses or of the pulse sequence can be selected to be so high that a flickering of the brightness of the light emitted by the light source due to the generation of the combined PWM signals is no longer perceived by the inertia of the human eye.
  • the frequency of the PWM pulses can be selected, for example, higher than 200 Hz.
  • the invention also relates to an integrated circuit, in particular ASIC, microprocessor or hybrid thereof, which circuit is designed to carry out a method of the abovementioned type.
  • a further aspect relates to a dimmable operating device for lamps, in particular LEDS or OLEDs,
  • the invention also relates to a lighting module, comprising lighting means, in particular LEDs or OLEDs, and a control gear.
  • the invention also proposes a lighting system, comprising at least one lighting module, which is connected via a signal line to a central unit, which is designed for the transmission of dimming specifications, in particular according to the DALI standard.
  • the method according to the invention also has the advantage that a change in color or color locus can be relatively slow and continuous.
  • FIG. 1 shows a graphic illustration of the setting of the color locus according to the prior art
  • FIG. 2 shows an illustration of an exemplary embodiment of the setting of the color locus according to the invention
  • Figure 3 shows an embodiment of a schematic
  • Block diagram for an operating circuit according to the invention for operating three LED modules for operating three LED modules
  • FIG. 4 shows an exemplary embodiment for a color temperature of 2700 Kelvin
  • FIG. 5 shows a periodic P M control signal or PWM current according to the prior art
  • FIG. 6 shows an embodiment for a PWM control signal or for a PWM current according to the present invention
  • FIG. 7 shows a further exemplary embodiment of a PWM control signal or for a PWM current according to the present invention
  • FIG. 8 shows a further invention
  • Embodiment with amplitude dimming Embodiment with amplitude dimming.
  • the resolution for example, between 10 and 14 bits may be less than the resolution of the dimming preset value, if this is digital or analog (quasi infinitely fine resolution).
  • Figure 1 shows an example of the setting of the duty cycle of the pulse train or the PMW setting of three different groups of bulbs, here for the colors red, green and blue. In this way, any color can be set in RGB space. Depending on the color or color location to be set, the pulse width is set accordingly for each of the lighting groups.
  • FIG. 2 shows a detail of a pulse train according to the invention with a pulse repetition frequency of e.g. 100 Hz (1 / T) shown.
  • a method for adjusting a color locus in a dimming control of an electrical load allows, wherein the light source has at least two independently controllable lighting groups, which differ in their color reproduction or in their color spectrum.
  • the light source is driven with P M signals with a duty cycle that can be set in discrete steps.
  • a plurality of successive PWM signals can be combined for at least one group of lamps and thus instead of the sequence of PWM signals only a combined PWM signal is generated, to which then one or more subsequent PWM signals are omitted.
  • the individual lamp groups can be driven by a respective driver circuit, wherein preferably a common control circuit can influence or regulate the control of the individual lamp groups.
  • a combined PWM PWS signal is preferably generated when the pulse width of a PWM signal is less than a predetermined minimum proportion of the possible pulse width of a PWM signal, for example, half of the maximum possible pulse width of a PWM signal.
  • the combined PWM signals can be output offset to one another, so that at the same time a omitted PWM signal for a Illuminant group a summarized PWM signal for another group of lamps is generated.
  • the position of the combined PWM signals can be changed periodically or randomly within the group.
  • the dimming default value can be digital.
  • the pulse repetition frequency can be selected to be high enough so that a flickering of the brightness of the light emitted by the light source due to the generation of the combined PWM signals is no longer perceived by the inertia of the human eye.
  • the frequency of the PWM pulses can also be selected higher than 200 Hz.
  • the variation of the pulse width does not always have to be in the direction of larger values, but can also be done in the other direction.
  • FIG. 3 shows an exemplary embodiment of a schematic block diagram for an operating device 1 according to the invention for operating LEDs 6 or LED modules 14, 15, 16.
  • the operating device 1 is part of a lighting system 10 and comprises a control unit 2, a first driver circuit 3, a second driver circuit 4, a third driver circuit 5, and a DC power source 7.
  • the operating device 1 has two inputs, namely a first input 8 for the power supply via the power supply line 9 and a second input 11 for receiving data.
  • the DC power source 7 is supplied via the first input 8 from the AC mains with AC voltage. At its output, the DC power source 7 provides a constant DC current 10 available.
  • the DC power source 7 may preferably include a rectifier for rectifying the mains voltage, a voltage converter for lowering the rectified mains voltage, and a converter for generating the direct current 10.
  • the DC power source 7 can be controlled by the control unit 2 such that the DC current 10 generated by the DC power source 7 is e.g. is adjustable depending on dimming default values.
  • the data received via the input 11 are, for example, dimming preset values, ie control signals for controlling the brightness of the connected LEDs 6. These data are preferably transmitted via a bus 12, for example, from a central processing unit 13.
  • a bus 12 is a DALI (Digital Addressable Light ng Interface) bus for implementing the DALI protocol for controlling lighting equipment.
  • the data can thus be in digital form via the bus 12 are transmitted.
  • the control unit 2 of the operating device 1 is connected to the bus 12, so that the brightness of the LEDs 6 and the LED modules 14, 15, 16, for example. Centrally controlled by the central processing unit 13.
  • the control unit 2 of the operating device 1 utilizes the data or dimming specifications received via the second input 11 and accordingly controls the LEDs 6 or the LED modules 14, 15, 16.
  • the supply of the LED modules 14, 15, 16 takes place via a respective driver circuit in which a first driver circuit 3, the first LED module
  • the third LED module 16 is powered.
  • the operating device 1 can thus control several LED modules independently of each other.
  • one or more of the LED modules may be an LED array of blue LEDs that emit white light using a color conversion agent. It is also possible that each LED module controls a different LED color. It is also e.g. It is conceivable that one module activates red LEDs, one module green LEDs and one module blue LEDs in order to achieve every desired point in the RGB color space.
  • one, two or more than three LED modules can be controlled.
  • several LED modules can be powered by a common driver circuit.
  • the present invention particularly relates to LED modules 14, 15, 16 which emit white light, wherein the characteristic, ie in particular the color temperature within the Planck's white light curve is variable.
  • the invention further relates in particular to the use of LED modules, which have a blue-emitting LED, a red-emitting LED and a farbstoffkonvertator 'LED (blue LED with dye in the yellow / green area).
  • the invention is not limited to such combinations of colored LEDs, but rather the invention may relate to an LED module having at least two LEDs having different color emission spectra.
  • the two emission spectra can preferably be combined so that at least two different color coordinates in the region of the Planck's white light curve can be set.
  • the driver circuit 3, 4, 5 is a circuit known per se, which, starting from the constant direct current 10, generates a pulse-width-modulated current i3, i4, i5.
  • the driver circuit 3, 4, 5 comprises at least one switch (not shown) which can be controlled by a control signal PWM3, PWM4, PWM5 such that a desired pulse-width-modulated current i3, i4, i5 operates the LEDs at the output.
  • the control signal is preferably a pulse width modulated (PWM) control signal generated by the control unit 2.
  • PWM pulse width modulated
  • the brightness of the LEDs 6 can be controlled in a known manner via the amplitude of the current i3, i4, i5 and / or via the duty cycle of the control signal PWM3, PWM4, PW5.
  • PWM3, PWM4, PW5 pulse width modulated
  • the blue-emitting LEDs in the LED module must be operated very strongly dimmed, as I said, even with a dimming value of 100% of the total Light outputs.
  • FIG. 4 shows an exemplary embodiment for the course of the control signals PWM3, PWM4, PWM5, so that a color temperature of 2700 Kelvin can be achieved by the illumination system 10.
  • the control signals PWM3, PWM4, PWM5 control driver circuits 3, 4, 5 for respectively supplying an LED module 14 with red emitting LEDs, an LED module 15 with dye converted LEDs such as blue LEDs with yellow / green dye, and an LED Module 16 with blue emitting LEDs.
  • the control unit 2 When dimming these values are downgraded accordingly.
  • each LED module 14, 15, 16 is dimmed in accordance with the pending AnSteuerbetation or the upcoming Dimmvorgabe up to the possible by the PWM hardware limit with respect to the duty cycle.
  • the duty cycle for the LED module concerned is not further reduced. Rather, turn-on pulses are completely omitted, and therefore the duty cycle in the remaining pulses increases.
  • FIG. 5 shows a known periodic PWM control signal 50, in which the dimming specifications are converted into a Fall below a predetermined minimum value TL for the duty cycle should result.
  • This value TL is preferably defined by the fact that above this value, the duty cycle can be kept stable.
  • the duty ratio T5setpoint of a periodic control signal which has a pulse in each period T0, is first calculated in accordance with the dimming setpoint values.
  • This theoretical PWM signal is shown in dashed lines in FIG.
  • the minimum duty cycle value TL is undershot.
  • the control unit 2 is then designed to increase the duty cycle at least to the value TL, but to omit individual pulses, so that in the time averaging the same overall brightness is achieved as in the periodic control signal shown in Figure 5 PWM5 with duty cycle T5set.
  • FIG. 6 shows an exemplary embodiment of a control signal 60 according to the present invention, in which the pulse has been widened in the first period [0, TO].
  • the duty cycle is tripled to a value higher than the minimum value TL, for example.
  • the pulses in the following two periods [TO, 2T0] and [2T0, 3T0] are not generated and completely omitted.
  • TW the same brightness of the LED module results compared with the known control signal 50 shown in FIG.
  • each nth turn-on pulse for the relevant LED module is completely omitted, and instead the duty cycle for this LED module in the remaining pulses multiplied by n / (nl). What matters is that the new value for the duty cycle is higher than the minimum value TL.
  • not only the third pulse in a period TW is not always omitted.
  • the control signal 72 shown in Fig. 7 is thus constructed.
  • the third pulse is skipped between 2T0 and 3T0, whereas in the following period TW2 it is the second pulse between 4T0 and 5T0.
  • the omission of pulses can be carried out according to the invention, either only for each standing on the PWM boundary TL PWM signal.
  • the human eye will see the resulting color changes or
  • the frequency is thus preferable for the frequency to be still above the temporal resolution of the human eye, even if the pulses for all or only one selected color channel are omitted. for example, above 60 to 65 Hz, preferably above 80 Hz, preferably above 100 Hz.
  • this dimming method can be combined as desired with other dimming methods, in particular with a continuous or stepwise variation of the current amplitude by the respective driver circuit 3, 4, 5.
  • Both amplitude modulation and PWM are performed in the upper dimming range.
  • Upon reaching the lower limit for current and / or duty cycle can be switched to the inventive selective omission of pulses.
  • the invention can also be adapted, for example, to a pure amplitude, e.g. in the upper dimming area.
  • a corresponding embodiment is e.g. shown in FIG.
  • the amplitude dimming may be stably performed up to a lower predetermined value AL.
  • the amplitude A0 for the matching current 80 for the LED module is calculated.
  • the lower limit AL for the possible reduction of current for an LED module can be switched to the above-mentioned selective omission of pulses or collapse of pulses.
  • the current signal 82 for the LED module for example, the pulse between 2T0 and 3T0 is omitted, so that the resulting brightness of the LED module can be reduced according to the dimming specifications, but at the same time the minimum amplitude AL is not exceeded.
  • the color locus remains averaged over time in terms of the resolving power of the human eye, ie, at a frequency of, for example, 100 hertz constant.
  • the method according to the invention can also be used for dimming a single LED module or for generating a single pulse-modulated current.
  • the invention then contributes to the fact that preferably at low dimming values, the brightness of the LED module can be kept stable.
  • An advantage of the invention is that the resulting color intensity of a single LED module or the entire illumination system 10 is kept stable.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

L'invention concerne un procédé pour atténuer au moins un moyen d'éclairage (6) tel qu'une DEL ou OLED fonctionnant au moyen d'un courant à modulation d'impulsions en largeur (i3, i4, i5), procédé selon lequel le rapport cyclique et/ou l'amplitude du courant à modulation d'impulsions en largeur (i3, i4, i5) peut être réglé(e) en fonction d'une intensité de couleur ou d'une clarté souhaitée du moyen d'éclairage (6). Pour régler l'intensité de couleur ou la clarté du moyen d'éclairage (6), au moins une impulsion du courant à modulation d'impulsions en largeur n'est pas prise en compte.
EP12810032.8A 2011-10-27 2012-10-29 Atténuation de moyens d'éclairage par modulation d'impulsions en largeur pwm Active EP2772120B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ATGM585/2011U AT13736U1 (de) 2011-10-27 2011-10-27 Pwm-dimmen von leuchtmitteln
DE102012200657A DE102012200657A1 (de) 2011-10-27 2012-01-18 PWM-Dimmen von Leuchtmitteln
PCT/AT2012/000270 WO2013059849A1 (fr) 2011-10-27 2012-10-29 Atténuation de moyens d'éclairage par modulation d'impulsions en largeur pwm

Publications (2)

Publication Number Publication Date
EP2772120A1 true EP2772120A1 (fr) 2014-09-03
EP2772120B1 EP2772120B1 (fr) 2019-01-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12810032.8A Active EP2772120B1 (fr) 2011-10-27 2012-10-29 Atténuation de moyens d'éclairage par modulation d'impulsions en largeur pwm

Country Status (4)

Country Link
EP (1) EP2772120B1 (fr)
AT (1) AT13736U1 (fr)
DE (2) DE102012200657A1 (fr)
WO (1) WO2013059849A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102013223711A1 (de) * 2013-11-20 2015-05-21 Osram Gmbh Steuern eines wenigstens zwei Halbleiterlichtquellen aufweisenden Leuchtmittels
DE102016107725B4 (de) * 2016-04-26 2023-09-28 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verfahren zum Ansteuern einer Mehrzahl von Leuchtmodulen eines Matrixscheinwerfers für ein Kraftfahrzeug
CN111034360B (zh) * 2017-08-23 2022-08-02 微通香港照明有限公司 控制一组照明单元对动态照明场景的输出的系统和方法
CN117295206B (zh) * 2023-11-24 2024-04-12 杭州罗莱迪思科技股份有限公司 恒亮度恒功率调色控制方法和灯具

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US20040174152A1 (en) * 2003-03-04 2004-09-09 Hwang Jeffrey H. Pulse-skipping switching power converter
EP1627556A1 (fr) * 2003-05-19 2006-02-22 Sloanled, Inc. Appareil et methode de commande de plusieurs led
US7902771B2 (en) * 2006-11-21 2011-03-08 Exclara, Inc. Time division modulation with average current regulation for independent control of arrays of light emitting diodes
DE102007034177B4 (de) * 2007-07-23 2009-06-10 Diehl Aerospace Gmbh Verfahren zum Dimmen des von LED-Leuchten abgestrahlten Lichts, insbesondere in der Fluggastkabine eines Verkehrsflugzeuges
DE102009040283A1 (de) * 2009-09-04 2011-03-10 Tridonic Ag Betrieb von pulsmodulierten LEDs

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Also Published As

Publication number Publication date
WO2013059849A1 (fr) 2013-05-02
AT13736U1 (de) 2014-07-15
DE102012200657A1 (de) 2013-05-02
DE112012004478A5 (de) 2014-07-10
EP2772120B1 (fr) 2019-01-09

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