WO2014067893A1 - Procédé permettant de faire fonctionner une source de lumière dotée de plusieurs del ou de groupes de del - Google Patents

Procédé permettant de faire fonctionner une source de lumière dotée de plusieurs del ou de groupes de del Download PDF

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Publication number
WO2014067893A1
WO2014067893A1 PCT/EP2013/072491 EP2013072491W WO2014067893A1 WO 2014067893 A1 WO2014067893 A1 WO 2014067893A1 EP 2013072491 W EP2013072491 W EP 2013072491W WO 2014067893 A1 WO2014067893 A1 WO 2014067893A1
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WO
WIPO (PCT)
Prior art keywords
led
leds
led groups
delay time
duration
Prior art date
Application number
PCT/EP2013/072491
Other languages
German (de)
English (en)
Inventor
Thomas Steffens
Original Assignee
Zumtobel Lighting Gmbh
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 Zumtobel Lighting Gmbh filed Critical Zumtobel Lighting Gmbh
Priority to EP13783561.7A priority Critical patent/EP2915412A1/fr
Publication of WO2014067893A1 publication Critical patent/WO2014067893A1/fr

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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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines

Definitions

  • the present invention relates to a method according to the preamble of
  • Claim 1 for operating a light source which has at least two separate LEDs or LED groups, wherein the LEDs or LED groups respectively
  • LEDs Pulse width modulated currents are supplied.
  • the term "LEDs” is intended to mean both semiconductor materials based light sources and so-called organic LEDs (OLEDs).
  • LEDs There are various possibilities for setting the brightness of a light source based on LEDs.
  • the current most common approach is to provide the LEDs with pulse width modulated currents. In this case, so the LEDs are repeatedly turned on and off, whereby by changing the ratio between duty and off duration, the average
  • the procedure based on pulse-width-modulated currents has the advantage that during the switch-on phase of the LED, it can be operated with the optimum current for LED operation. So here is a very efficient LED operation feasible, although in spite of a basically stepless adjustment of the brightness is possible.
  • This procedure for changing the brightness of an LED or an LED group can also be used, in particular, when a light source has different LEDs or LED groups which, for example, emit light of a different color or color temperature, for example. By appropriately adjusting the brightness of the respective LED or LED group, the total emitted light can then be changed with respect to its color or color temperature.
  • each LED or LED group is then supplied with a pulse width modulated current required to achieve the individual brightness.
  • the present invention is based on the object to further optimize the approach in operating a light source based on LEDs, on the one hand in terms of efficiency and on the other hand in terms of quality of light output.
  • the inventive method is based on the idea to operate the different LEDs or LED groups in turn with pulse width modulated currents. It is now provided, however, that the individual LEDs or LED groups supplied currents are timed to each other, that to each
  • Time maximum one of the LEDs or LED groups, ie a so-called. Channel is supplied with power.
  • Light source which has at least two separate LEDs or LED groups, proposed, wherein the LEDs or LED groups each pulse width modulated
  • the inventive method also allows a change in the color or color temperature of the total emitted light and a dimming of the total brightness. Depending on the intended overall brightness, a period may be provided in particular in which none of the LEDs or LED groups is supplied with power.
  • a particularly simple procedure for realizing the solution according to the invention is that after switching off a first LED or LED group, a different LED or LED group is switched on only at a predetermined time or after a predetermined switch-off period.
  • the time interval between the switching off of the first group and the switching on of the following group is permanently constant in this case, and after switching off the second group - if there are no other other LEDs or LED groups - it is still possible to connect a switch-off period, which, as mentioned above, serves to adjust the overall brightness and can be variable in duration.
  • the time interval between switching off a first LED or LED group and switching on a second LED or LED group could also be variable.
  • the light output with respect to its time course is even more variable or homogeneous, in particular, it may be provided that the Bacausschaltdauer a drive cycle
  • Switch-off period or a minimum duration for a switch-off period can be in the range of a few ⁇ , in particular about ⁇ .
  • the different LEDs or different LED groups may in particular be light sources that emit light of a different color or color temperature. By adjusting the individual brightnesses, the total light output can then be adjusted with regard to its color or color temperature.
  • the inventive concept is by no means limited to only two LEDs or LED groups but can be extended in principle to any number of different LEDs or LED groups.
  • Figure 2 shows the time course of the currents for two different LED groups according to a known from the prior art solution
  • FIG. 3 shows the time course of the LED currents according to the invention
  • FIG. 4 shows the individual steps in a first variant of the invention
  • FIG. 5 shows the individual steps in a second variant of the invention
  • FIG. 1 very schematically shows an operating device 1 for operating a LED-based light source 100, which in the illustrated embodiment consists of two LED groups 101 and 102.
  • the operating device 1 is connected on the input side to the general power supply and internally has a control unit 5 which is designed to convert the mains supply voltage UNetz into supply voltages or currents I LED I and I LED 2 for operating the two LED groups 101 and 102 ,
  • the control unit 5 has means internally known from the prior art for carrying out a corresponding conversion of the mains supply voltage UNetz.
  • the currents I LED I and I LED 2 supplied to the LED groups 101 and 102 are-as schematically indicated-pulse-width-modulated, that is to say the LEDs of the two groups 101, 102 are switched on and off alternately, whereby
  • Brightness of the respective group 101, 102 can be changed.
  • the control circuit 5 can be designed, in particular, to convert external control signals received via an interface 2 into suitable operating currents I LED I and I LED 2 to ensure that the total light output realized by the light source 100 has a desired mixed color or a desired color temperature , In addition, by appropriately setting the switch-off duration (s) and the
  • Total light output can be changed in their brightness, ie a dimming
  • this principle is applicable not only to the two illustrated LED groups 101 and 102 but can in principle be used with any number of LED groups.
  • RGB arrangements ie light sources with the colors red, green and blue are common, which allow the emission of light of almost any hue.
  • the hitherto predominantly conventional procedure for driving the two LED groups 101 and 102 is shown schematically in FIG. This figure shows the course of the respective LED currents I LED I and I LED 2, wherein so far at a time t 0 , which represents the beginning of a drive cycle, both LED groups were turned on simultaneously.
  • the first group 101 remains switched on for a period ⁇
  • the second group 102 is switched on only for a shorter period ⁇ 2 .
  • the first LED group 101 is, in this case, a larger proportion to the total light output at as the second group 102.
  • a further period of time includes x on off, in which both groups of LEDs 101, 102 are inactive.
  • the duration of this third time period from x is then calculated in how high the intensity of the total light output should be. That is, over the change of this period x from a dimming of the total light output can be made, while on the other hand via a change in the ratio of the times ⁇ and ⁇ 2, an adjustment of the color or color temperature is possible.
  • a new actuation cycle begins, that is, both LED groups 101 and 102 are again supplied with power.
  • the currents I LED I and I LED 2 supplied to the LED groups 101, 102 are matched in time to one another in such a way that at most one maximum of the two groups 101, 102 is active. A first possibility for this is shown in FIG.
  • a drive cycle for the two LED groups 101, 102 begins again at the time t 0 , wherein, however, initially only the first group 101 is switched on, and in turn for the period ⁇ . Only after completion of this switch-on phase for the first LED group 101, the activation of the second group 102 for the period ⁇ 2 , which is strictly speaking after switching off The first group 101 is first waited for a short period ⁇ 0 & before the second LED group 102 is turned on. This time separation for the phase x 0ff ensures that there is actually no overlap in terms of the power supply. It is actually a conscious one
  • the delay time ⁇ 0 & is therefore in the range of a few ⁇ , for example about ⁇ , so that in fact there is a clear separation of the switch-on of the different color channels.
  • the second group 102 again remains active over the period ⁇ 2 and is then deactivated again.
  • the first group remains inactive over the period, which corresponds in terms of its duration to the period x of FIG. 2, so that the
  • Period ⁇ 2 another turn-off consisting of the period Tbi ac k and the delay time ⁇ 0 followed & then again at time ti the next drive cycle begins.
  • the light output realized in the procedure according to FIG. 3 is identical to the light output in the procedure of the prior art with respect to its hue or its color temperature as well as its overall brightness.
  • the maximum power consumption is much lower. This means that no such high current and voltage peaks can occur, as is the case in the prior art procedure.
  • the measures for powering the LED groups 101, 102 can be realized accordingly with a significantly lower cost.
  • Light source or illuminated by the light source area is recorded with a digital camera.
  • the switch-off duration T out for the first LED group 101 is used to realize the light output of the second LED group 102.
  • the periods ⁇ 0 & and Tbiack, in which there is no light output, are thus significantly shorter, whereby obviously the following relationship applies:
  • time period Tbi ac k can be kept variable or adjusted to make a dimming of the total brightness, but it is important that at comparable light output in the procedure according to the invention over a much shorter period of time no light is emitted as in the case of the The prior art solution is the case.
  • a more homogeneous light output is achieved by which any flicker effects or the like can be avoided.
  • FIG. 1 A first flow diagram of a conceivable variant for driving the LED groups according to the invention is shown in FIG. It is assumed that there are altogether n different LED groups or n so-called channels.
  • the control unit 5 the turn-on ⁇ to ⁇ ⁇ for the different channels as well as the duration of it possibly subsequent complete switch-off phase Tbi ac k determined, these time periods in particular on the basis of the externally supplied control signals over which, for example, a total color or color temperature and a total brightness is specified, are calculated.
  • a channel counter value i is set to the start value 1.
  • step S 3 a check is made as to whether the channel corresponding to the channel counter value i is to be activated at all, ie whether the corresponding LED group should contribute its color to the light output. If this is the case, all channels except the channel i are first turned off in step S 4 (at the beginning of the cycle all channels are switched off anyway) and in the following step S 5 the
  • step S 6 Delay time x 0ff waited. Subsequently, the channel i is activated, that is supplied with power (step S 6 ). After the expiration of the corresponding period of time ⁇ in step S 7 ; has been detected for the activation of this channel i, the channel counter value i is increased by the value 1 in step S 8 .
  • step S it is then checked whether the channel counter value i is less than or equal to the total number n, ie whether the last channel has already been activated or whether there are other channels. If there are still other channels, the method is continued with step S 3 and checked accordingly whether the new
  • step S 10 it is checked in step S 10 whether the brightness of the total light output should be 100% or whether the total light output should be dimmed. If dimming is required, all channels are deactivated in step Sn and then (step S 12 ) the period Tbiack is awaited. This is then a drive cycle is completed and the process begins again with step S ls which in turn is checked by the control unit 5, if - eg
  • the desired mixed color and the desired overall brightness first calculates the number n on on the separated channels and the total break ibiackGetician during a cycle. Further, for each channel, the individual
  • channels to be switched on is greater than 0, ie whether a channel is to be activated at all. If this is not the case, all channels are deactivated in step S103 and the cycle begins again.
  • step S104 the
  • step S105 it is checked whether the proportionate switch-off time Tbi ac k calculated in this way is below a predetermined mill-off switch-off duration ⁇ 0 & . If this is the case, a correction of the switch-off time to the minimum duration x 0ff takes place in step S106. This completes the calculation of the switch-on durations for the various channels and the proportionate switch-off times and the actual activation of the channels begins, the count index i being initially set to 1 as in the method of FIG.
  • step S 107 This is followed by the check whether the corresponding channel is to be activated (S 108 ). If this is not the case, the program jumps directly to step S 112 and increments the counting index i by one. If, on the other hand, the corresponding channel is to be activated, a check is made in step S10 as to whether the proportional switch-off duration is greater than zero. If, on the other hand, the current channel is to be activated, all channels are deactivated in step Sno. Furthermore, the proportional switch-off time Xbiack is waited for and the channel i finally for the calculated on-time x; activated.
  • step Sm all channels except channel i are first deactivated. After waiting for the minimum delay time x Qff , the channel i is finally activated for the start time calculated at the beginning.
  • step S 112 the count index i is increased. If the subsequent check S 113 reveals that i is less than or equal to n, ie other channels exist, then the method is continued with step Sios. When the last channel has been reached, the drive cycle is completed and the process starts again with step S101 .
  • Another development of the method according to the invention can also be to vary the PWM frequencies.
  • the corresponding LED group is initially operated, in principle, at the minimum pulse length, and therefore the
  • Total shutdown Xbkck is reduced.
  • the switch-on duration for the corresponding LED or LED group can then be increased and the switch-off period x b i ac k remains constant at a small value. This can be continued until at maximum brightness the switch-off period Tbi ac k completely disappears.
  • the driving of for generating a desired mixed color or mixed color temperature and overall brightness is significantly optimized.
  • the effort for driving can be reduced, on the other hand, the quality of the light output is improved in terms of temporal homogeneity.

Abstract

L'invention concerne un procédé permettant de faire fonctionner une source de lumière, laquelle présente au moins deux DEL ou groupes de DEL (101, 102) séparés, des courants (ILED1, ILED2) modulés par impulsion étant respectivement acheminés jusqu'aux DEL ou jusqu'aux groupes de DEL (101, 102). Selon ce procédé, les courants (ILED1, ILED2) acheminés jusqu'aux DEL ou jusqu'aux groupes de DEL (101, 102) sont adaptés les uns aux autres dans le temps, de telle manière qu'à tout moment, au maximum une des DEL ou un des groupes de DEL (101, 102) est alimenté(e) en courant (ILED1, ILED2).
PCT/EP2013/072491 2012-10-30 2013-10-28 Procédé permettant de faire fonctionner une source de lumière dotée de plusieurs del ou de groupes de del WO2014067893A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13783561.7A EP2915412A1 (fr) 2012-10-30 2013-10-28 Procédé permettant de faire fonctionner une source de lumière dotée de plusieurs del ou de groupes de del

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012219817.2 2012-10-30
DE102012219817.2A DE102012219817A1 (de) 2012-10-30 2012-10-30 Verfahren zum Betreiben einer Lichtquelle mit mehreren LEDs oder LED-Gruppen

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WO2014067893A1 true WO2014067893A1 (fr) 2014-05-08

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EP (1) EP2915412A1 (fr)
DE (1) DE102012219817A1 (fr)
WO (1) WO2014067893A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019105953A1 (de) * 2019-03-08 2020-09-10 HELLA GmbH & Co. KGaA Steuer- und/oder Regelungsmittel, Schaltungsanordnung und Verfahren zur Ansteuerung von Leuchtdioden in einem Leuchtdiodenfeld

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US20080048573A1 (en) * 2006-07-17 2008-02-28 Powerdsine, Ltd. - Microsemi Corporation Controlled Bleeder for Power Supply
US20080100232A1 (en) * 2006-01-25 2008-05-01 Mitsuaki Miguchi Power Supply Apparatus, Light Emitting Apparatus, and Display Apparatus
US20080116818A1 (en) * 2006-11-21 2008-05-22 Exclara Inc. Time division modulation with average current regulation for independent control of arrays of light emitting diodes
WO2009060400A1 (fr) * 2007-11-07 2009-05-14 Koninklijke Philips Electronics N.V. Circuit d'alimentation électrique
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JP2007290450A (ja) * 2006-04-21 2007-11-08 Denso Corp 照明装置
DE102007002809A1 (de) * 2007-01-18 2008-07-24 Hella Kgaa Hueck & Co. Verfahren zum gepulsten Betrieb einer Beleuchtungseinrichtung mit Leuchtdioden (LED) für Kraftfahrzeuge
US20090225020A1 (en) * 2008-03-07 2009-09-10 O2Micro, Inc. Backlight controller for driving light sources
DE102008027148A1 (de) * 2008-06-03 2009-12-10 Technisat Digital Gmbh Verfahren zum Betrieb einer Lichtquelle eines Kraftfahrzeugs
TWI459858B (zh) * 2008-06-24 2014-11-01 Eldolab Holding Bv 照明系統及發光二極體組件之控制單元
DE102010046795A1 (de) * 2010-09-28 2012-03-29 E:Cue Control Gmbh Verfahren zum Betrieb eines LED-Leuchtmittels mit mehreren LEDs, Steuereinheit für ein LED-Leuchtmittel mit mehreren LEDs und LED-Leuchtmittel

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Publication number Priority date Publication date Assignee Title
US20080100232A1 (en) * 2006-01-25 2008-05-01 Mitsuaki Miguchi Power Supply Apparatus, Light Emitting Apparatus, and Display Apparatus
US20080048573A1 (en) * 2006-07-17 2008-02-28 Powerdsine, Ltd. - Microsemi Corporation Controlled Bleeder for Power Supply
US20080116818A1 (en) * 2006-11-21 2008-05-22 Exclara Inc. Time division modulation with average current regulation for independent control of arrays of light emitting diodes
WO2009060400A1 (fr) * 2007-11-07 2009-05-14 Koninklijke Philips Electronics N.V. Circuit d'alimentation électrique
WO2010030462A1 (fr) * 2008-09-12 2010-03-18 General Electric Company Eclairage couleur réglable à semi-conducteurs
US20110248642A1 (en) * 2010-04-09 2011-10-13 Rohm Co., Ltd. Light emitting device control circuit device and control method of the control circuit device

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Publication number Publication date
EP2915412A1 (fr) 2015-09-09
DE102012219817A1 (de) 2014-04-30

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