EP2796001A1 - Dimmbarer konverter und dimmverfahren für leds - Google Patents
Dimmbarer konverter und dimmverfahren für ledsInfo
- Publication number
- EP2796001A1 EP2796001A1 EP12813334.5A EP12813334A EP2796001A1 EP 2796001 A1 EP2796001 A1 EP 2796001A1 EP 12813334 A EP12813334 A EP 12813334A EP 2796001 A1 EP2796001 A1 EP 2796001A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- led
- duty cycle
- dimming
- current
- converter
- 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
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]
- H05B45/20—Controlling the colour of the light
- H05B45/24—Controlling the colour of the light using electrical feedback from LEDs or from LED modules
Definitions
- the present invention relates to a dimmable LED converter and a method for operating, in particular dimming, LED lines.
- the invention can be used, for example, to control one or more LED paths of an LED module.
- the invention can achieve increased color stability of the light emitted by such an LED module.
- An LED track is provided with one or more inorganic or organic LEDs. It is known to provide one or more LED circuits with an LED converter with power. It is also known from the prior art to dim LED lines starting from a dimming preset with an LED converter. Usually, two known methods are used in dimming. On the one hand, the temporal mean value of the amplitude of the current can be changed directly by means of an LED route. This method is referred to as amplitude dimming and is shown schematically in FIG. In order to set a dimming value A, the amplitude of the current through the LED path is set constant in time to a value I a . To set a different dimming value B, the current amplitude is changed to a constant value I B.
- amplitude dimming and PWM dimming have specific disadvantages.
- amplitude dimming in addition to the change in the light intensity (i.e., the desired dimming effect), an undesirable shift in the wavelength of the light may occur, which can change the light color markedly.
- PWM dimming is disadvantageous at low dimming levels, as it is difficult to set the required very small duty cycles (i.e., very small effective currents).
- EP 1 689 212 B1 therefore proposes using amplitude dimming at very low dimming values and using PWM dimming for higher dimming values.
- the light color is defined as a color coordinate or tristimulus in a so-called CIE standard color system or CIE diagram.
- CIE diagram Such a CIE diagram is shown in FIG.
- Each combination of the primary colors red, blue, and green (ie RGB) lies within the coordinates of the diagram.
- the horizontal axis indicates the green component (X component)
- the vertical axis indicates the red component (Y component)
- the gray encoding indicates the blue component (Z component) of the color coordinate.
- white light can be generated by mixtures of light whose color coordinates are on the line of a blackbody radiator in the CIE diagram.
- the color coordinate of the light emitted by an LED track depends on both the current flowing through the LED track and the temperature of the LED track.
- Fig. 4 shows how the normalized color coordinate (plotted on the vertical axis, showing only the Y component of the color coordinate) is changed non-linearly with the current (plotted on the horizontal axis) through the LED path.
- FIG. 5 also shows how different temperatures of the LED path affect the same normalized color coordinate (only the Y component of the color coordinate is shown).
- the change of the color coordinate leads to a shift in the CIE Diagram.
- a color shift of one of the LED paths can greatly influence the color coordinate of the total emitted light of the LED module.
- a detected (for example, linear) dependence in an EEPROM of an LED module is not a simple addition of the changes caused on the one hand by the temperature dependence and on the other hand by the current dependence. Rather, the actual change in the color coordinate results only from a complex calculation that is highly dependent on the specific combination of temperature and current amplitude. The problem therefore arises that for each value of the current amplitude, a corresponding temperature dependence (as shown in FIG. 5) would have to be determined, if continuous current amplitudes are then to be used in the course of a dimming process (as described, for example, in FIG.
- the present invention therefore has for its object to solve the above-mentioned problems of the prior art.
- the disadvantages of the known dimming method should at least be mitigated.
- the invention has the object of providing a dimmable LED converter and a corresponding method for operating and dimming LED lines or LED modules with which the color coordinate of the emitted light is stable both over the entire dimming range and over a predetermined temperature range can be held.
- the light output should change linearly with the specified dimming value when dimming.
- the present invention relates to a dimmable LED converter, which is adapted to supply starting from a dimming default at least one LED track with a current, wherein at least the time average of the amplitude of the current through the at least one LED track ⁇ 2)
- the duty cycle of pulses are adjustable, during which the turn-on LED current flows, wherein in at least a portion of the total dimming range in the direction of lower dimming the Duty cycle of the pulses is preferably reduced at a constant current amplitude until the duty cycle reaches a predetermined lower limit, at which further reduction of the dimming value, the duty cycle is suddenly increased by a predetermined value and at the same time the current amplitude is abruptly reduced to a reduced value , whereupon the duty cycle is reduced again to reduce the dimming value even further while the current amplitude remains constant.
- the LED converter allows so is suitable for operating and dimming at least one LED track or an LED module (multiple LED routes). Both the disadvantages of amplitude dimming and PWM dimming can be at least greatly attenuated. On the one hand, on the one hand, no continuous amplitude dimming at low dimming values has to be carried out. A strong color shift in this area of the total dimming range can thus be avoided. Because otherwise only discrete current amplitudes are set, there is no continuous shift in the wavelength of the emitted light, ie a continuous change of the color coordinate, to be expected in other areas. The sudden changes of the current amplitude to discrete values can be compensated more easily.
- the duty ratio of the PWM dimming up to the predetermined lower limit value can be easily performed. So it can be achieved a large total dimming without very small - as described above problematic - duty cycles are needed.
- this number is on the one hand advantageously large enough to span a large total dimming range due to the multiple jumps in the current amplitude, without ever having to set extremely low duty cycles.
- the number is advantageously limited to only a few discrete current amplitudes, which facilitates compensation of current-related and / or temperature-related color shifts (changes in the color coordinate of the emitted light).
- an associated current amplitude is stored in the dimmable LED converter for each section of the total dimming range of the at least one LED track.
- the dimmable LED converter is adapted to cause a non-linear change in the light output of the light emitted by the at least one LED track caused by a sudden decrease in the current amplitude of the at least one LED track and / or a change in temperature to compensate by adjusting the duty cycle.
- the dimmable LED converter can measure the ambient temperature and / or the temperature of the LED track indirectly or directly, for example via a suitably positioned temperature sensor. For example, when the current amplitude is suddenly halved, the duty cycle is not merely doubled but jumped to an additionally corrected value so that the light output remains the same before and after the sudden changes.
- the correction value of the duty ratio can be calculated, for example, from a ⁇ of the dimmable LED converter.
- Correction values can also be stored in advance in a memory of the dimmable LED converter.
- the dimmable LED converter is adapted to selectively compensate for a non-linear change in the light output for a plurality of LED paths. As a result, in an LED module with multiple LED paths, both the light output and the color coordinate of the total emitted light can be better controlled.
- a plurality of LED circuits to be supplied with power can each be assigned to a color channel of an LED module.
- the multiple LED routes may be, for example, the color channels of a white light LED module.
- the selective adaptation and the resulting stabilization of the color coordinate make it possible to achieve a more uniform white light.
- the dimmable LED converter is adapted to change a color coordinate of the light emitted together from a plurality of LED paths, which is caused by a sudden decrease in the current amplitude by at least one LED paths Adjusting the duty cycle of the at least one LED track to compensate.
- the dimmable LED converter is arranged to change a color coordinate of the light emitted together by a plurality of LED strips caused by a sudden decrease in the current amplitude by at least one LED track, by adjusting the duty cycle of at least one other LED Route to compensate.
- the contribution to the total emitted light of the LED track, the color coordinate has changed, both by an adjustment, for example, an increase in the duty cycle of this LED track as well as an opposite adjustment, for example one Humidity, the duty cycle of at least one other LED track can be achieved.
- the color stability of an LED module with at least two LED paths over the entire dimming range can be improved. Since no continuous compensation of the color coordinate, but only a discrete compensation of the color coordinate must be performed every sudden change in the current amplitude, a simple and inexpensive implementation in a ⁇ of the dimmable LED converter is possible.
- the maximum dimming range of an LED module can be increased in color stability.
- the adjustment of the duty cycle can for example be calculated independently of the ⁇ C based on stored calculation formulas. Due to the limited number of discrete jumps in the current amplitude, the necessary measurement time for calibration processes of an LED module is also reduced.
- a dependency of the color coordinate on the discretely adjustable current amplitudes of each of the plurality of LED paths is stored.
- a ⁇ of the LED converter does not need to independently calculate the fit, i. a correction value of the
- Current dependency may be, for example, a value list or table or one or more color coordinate curves (such as shown in FIG Memory of the dimmable LED converter are stored.
- the LED converter can also be calibrated by storing new current dependencies. It is also conceivable to store several current dependencies in parallel, for example, for different age levels of an LED track or an LED module. As a result, age-related changes can be compensated.
- the dimmable LED converter is configured to compensate for a change in a color coordinate of the light emitted together by a plurality of LED paths caused by a change in temperature by adjusting the duty cycle of at least one LED path.
- a temperature dependence of the color coordinate for each discretely adjustable current amplitude of the at least one LED path is stored in the dimmable LED converter.
- the temperature dependence can be stored as the current dependence in a memory of the LED converter. It is advantageous to store value tables or trajectories of combined dependencies. A combination of a temperature and a current dependence does not have to be calculated complex, but can be easily read out.
- the light of an LED module can be dimmed by this color-stable.
- a calculation scheme may be filed that uses a microcontroller to determine the duty cycle that is suitable for compensating for a current-related or temperature-related change in the color coordinate.
- the adjustment of the duty cycle can be performed selectively for each LED track as well as selectively for a group of LED tracks.
- a group can be a color channel of an LED module.
- the present invention also relates to a method for operating based on a dimming input of at least one LED track, which is supplied with a current, wherein at least the time average of the amplitude of the current through the LED track as well as the duty cycle of pulses are adjustable during LED current flows, wherein in at least a portion of the total dimming range in the direction of lower dimming values, the duty cycle of the pulses is preferably reduced at a constant current amplitude until the duty cycle reaches a predetermined lower limit, at which the further reduction of the dimming value Duty cycle is increased abruptly by a predetermined value and at the same time the current amplitude is suddenly reduced to a reduced value, whereupon the duty cycle is reduced again for further reduction of the dimming value at a constant reduced current amplitude.
- Fig. 1 shows known amplitude dimming.
- Fig. 2 shows known PWM dimming.
- Fig. 3 shows color coordinates in the CIE diagram.
- Fig. 4 shows a current dependence of a color coordinate.
- Fig. 5 shows a current and temperature dependence of a color coordinate.
- Fig. 6 shows a block diagram of a dimmable LED converter of the present invention.
- Fig. 7 shows the course of the amplitude and the duty ratio of the current through an LED path.
- Fig. 8 shows the combined dimming method of the present invention.
- FIG. 6 shows a simplified block diagram of a dimmable LED converter 1, which supplies at least one LED section 2 with a current.
- An LED track 2 has at least one LED, where LED is understood as meaning both inorganic and organic LEDs (OLEDs).
- the LEDs can also be provided with luminous and / or scattering particles, for example coated, which influence the light emitted by the LED.
- the LED converter 1 controls the at least one LED track based on a dimming preset 3, for example, by an external control circuit.
- the LED converter is preferably a high-frequency clocked switching regulator, such as a buck converter or boost converter.
- the dimming preset 3 can predefine the current state amplitude (at least in the time average) and preferably a pulse duty factor of current pulses which are adjustable for each of the at least one LED line 2.
- the current pulses can be superimposed low-frequency of the high-frequency clocking of the switching regulator, in particular such that the high-frequency clocking takes place only during the switch-on period of the pulses.
- the LED converter 1 can set the predetermined current amplitude for current pulses at least in the time average.
- the dimmable LED converter 1 can generate the current amplitude as the time average of a high-frequency fluctuation of the current through the LED path 2, the high-frequency fluctuation in turn being generated, for example, by a switching regulator, for example a buck converter or boost converter can.
- the LED converter 1 may further set the predetermined duty cycle of the current pulses during which current flows through the at least one LED track 2.
- the dimmable LED converter 1 of the present invention is suitable for PWM dimming (as described above with reference to FIG. 2) also for amplitude dimming (as described above with respect to FIG. 1). It can therefore also a continuous, ie a non-pulsed current flow through the at least one LED track 2 and change the amplitude of this current discretely or continuously.
- PWM dimming is generally referred to a method in which a brightness change is effected via a pulsed signal.
- pulse width modulation it is also possible, for example, to use pulse width modulation or pulse code modulation.
- PWM dimming refers to a method in which the ratio on-time to off-time and thus the duty cycle is changed.
- the LED converter 1 may further be provided with a memory 4 such as an EEPROM, ROM or the like in which information can be stored as data.
- the LED converter 1 can write data to the memory 4 and read out data therefrom. This can be done, for example a microcontroller ( ⁇ ) 5 or ASIC of the LED converter 1 are performed.
- the ⁇ 5 and the memory 4 can also be integrated in one component.
- Fig. 7 shows how the LED converter 1 drives the at least one LED track 2 over a total dimming range according to the present invention. On the horizontal axis in Fig. 7, the percentage dimming value (in relation to the maximum light output) is displayed, on the vertical axis in the lower part of the percentage duty cycle and the upper part of the percentage current amplitude (in relation to the maximum current) is displayed ,
- the dimming value for lower dimming values is initially controlled exclusively via PWM dimming.
- the current amplitude remains preferably constant, in FIG. 7, for example, to 100%, ie the maximum current.
- the duty cycle is continuously reduced from about 70% to about 20%, thereby continuously reducing the effective current amplitude through the LED link 2. Since, in fact, only a constant current amplitude (in this case the maximum current amplitude of 100%) flows through the LED path, which is only switched on and off, the color coordinate of the light emitted by the LED path 2 changes in CIE diagram not. Incidentally, a duty cycle of about 20% can be easily set without having to accept the disadvantageous effects of PWM dimming described above.
- a lower limit of the indicated portion of the total Dimming range reached is defined, for example, by a minimum duty cycle to be set (in order, for example, to avoid the aforementioned problems of PWM dimming).
- the limit value can also be permanently assigned to a dimming value. If the limit value is reached, the current amplitude is suddenly reduced to further reduce the dimming value.
- a change with a rise can take place. Even if there is a sudden change in the amplitude, the change in the signal at the converter can increase as a result of the first transhipment (for example of parasitic elements).
- the current amplitude is reduced from 100% to 50% of the maximum current.
- a compensating increase in the duty cycle must be performed at the same time. In the simplest case, if the dimmable LED converter 1 calculates no correction values, the duty cycle would therefore have to be increased suddenly from approximately 20% to approximately 40%. However, in FIG. 7, the duty ratio is increased to only about 38% because additional compensation is performed as described below.
- the color coordinate of the light emitted by a plurality of LED lines 2 of an LED module is made up of a superposition of the light of the single LED stretches 2 together.
- the individual LED sections 2 of an LED module can be weighted differently.
- the LED converter 1 can now determine a correction value which changes the weighting of the f rb changed LED track 2 by an adaptation of the pulse duty factor such that the color coordinate of the light of the LED module as a whole is in the CIE diagram remains unchanged.
- the adjustment of the duty cycle can be made in accordance with dependencies stored in memory 4, for example, curves representing the color coordinate over the current and / or the temperature (as shown in FIGS. 4 and 5).
- the light output is not linear with the set current amplitude. Therefore, there could be an undesirable change in the light output as the current amplitude and duty cycle jumps.
- the ⁇ 5 of the LED converter 1 can also correct the duty cycle to the non-linear light output, ie it can make an adjustment for compensating both the light output and the color coordinate.
- the duty cycle at the limit is only increased to about 38% by leaps and bounds. So this is a correction value to allow a continuously adjustable light output and a color stability over the entire dimming range.
- the current amplitude is again kept constant (now constant at 50% in FIG. 6) and only the duty cycle is changed continuously.
- the dashed line shows an example of a dimming scheme with three sections of the total dimming range.
- each lower limit there are two lower limits (for the highest section and the middle section): at each lower limit, from high dimming values to low dimming values, the current amplitude is suddenly reduced while the duty cycle is increased sharply To balance both the non-linearity of the light output with the current amplitude and the change of the color coordinate with the current amplitude in an LED module. or may be fixed at predetermined dimming values.
- the duty cycle of individual LED sections 2 may change at different speeds (ie, vary in intensity with the same change in the dimming value). If the limit value for each LED segment is specified by the minimum duty cycle, LED segments 2 thus achieve this duty cycle at different dimming values. Whenever an LED track 2 undergoes a sudden change in the current amplitude, either a correction value of the duty cycle of this LED track 2 or another LED track 2 is determined, thereby performing a compensation of the color coordinate.
- the dimming method performed by the LED converter 1 allows only a few discrete current amplitudes, for example, two to four discrete current amplitudes for two to four sections of the total dimming range for at least one LED track 2, only a limited number are stored by temperature dependencies in the memory 4, to also perform an adjustment of the duty cycle to a temperature-induced change in the color coordinate.
- the method works equivalently from low dimming values to high dimming values.
- the current amplitude increases suddenly and at the same time the duty cycle of the current pulses abruptly reduced to a reduced value.
- the duty cycle of the current pulses abruptly reduced to a reduced value.
- FIG. 9 shows an exemplary transition at a lower limit of a portion of the total dimming range.
- Both the upper diagram and the lower diagram show a dimming value A at which the transition from one section to the other section takes place.
- this threshold value is switched from the current pulses of the upper diagram to the current pulses of the lower diagram.
- the Current amplitude is abruptly reduced while the duty cycle is increased abruptly.
- the pulse width t e i n is sharply widened, while the pauses t off between the individual current pulses are abruptly shortened.
- the effective current remains nearly the same, so that there is a continuous transition between the two sections of the total dimming range.
- the absolute current amplitude is changed. Resulting light power and color coordinate changes in an LED module are compensated as described by adjusting the duty cycle to a correction value.
- the present invention thus solves the aforementioned problems of the prior art with the LED converter 1 and the correspondingly executed method. It is possible to compensate for a nonlinear change in the color coordinate of an LED module as a function of the current through an LED path 2. In addition, the temperature dependence of the color coordinate of the LED module can be compensated. Due to the proposed method, this must be done only for a few discrete current amplitudes. For this information can be stored in advance in a memory. The amount of information is small due to the discrete current amplitudes, and therefore, an LED converter 1 having a simple design and inexpensive to manufacture can be provided. Nevertheless, the LED converter 1 can ensure high color stability for the light of a driven LED module over the entire dimming range.
- the pulse duty factor of the pulses is preferably constant Current amplitude is increased until the duty cycle reaches a predetermined upper limit, at the further increase of the dimming value, the duty cycle is abruptly reduced by a predetermined value and at the same time the current amplitude is increased abruptly to an increased value, whereupon for even further increase the dimming value at constant increased current amplitude again the duty cycle is increased.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011089885A DE102011089885A1 (de) | 2011-12-23 | 2011-12-23 | Dimmbarer Konverter und Dimmverfahren für LEDs |
| PCT/EP2012/076185 WO2013092734A1 (de) | 2011-12-23 | 2012-12-19 | Dimmbarer konverter und dimmverfahren für leds |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2796001A1 true EP2796001A1 (de) | 2014-10-29 |
| EP2796001B1 EP2796001B1 (de) | 2019-02-20 |
Family
ID=47552997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12813334.5A Not-in-force EP2796001B1 (de) | 2011-12-23 | 2012-12-19 | Dimmbarer konverter und dimmverfahren für leds |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2796001B1 (de) |
| DE (1) | DE102011089885A1 (de) |
| WO (1) | WO2013092734A1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013113053B4 (de) * | 2013-11-26 | 2019-03-28 | Schott Ag | Treiberschaltung mit einer Halbleiterlichtquelle sowie Verfahren zum Betrieb einer Treiberschaltung |
| AT16867U1 (de) | 2015-02-24 | 2020-11-15 | Tridonic Gmbh & Co Kg | Abwärtswandler zum Betreiben von Leuchtmitteln mit Spitzenstromwertsteuerung und Mittelstromwerterfassung |
| DE102015205808A1 (de) * | 2015-03-31 | 2016-10-06 | Osram Gmbh | Schaltungsanordnung zum Betreiben zumindest einer ersten und genau einer zweiten Kaskade von LEDs |
| DE102015210710A1 (de) | 2015-06-11 | 2016-12-15 | Tridonic Gmbh & Co Kg | Getaktete Sperrwandlerschaltung |
| US11252794B2 (en) | 2019-03-29 | 2022-02-15 | Electronic Theatre Controls, Inc. | Systems, devices, and methods for controlling an LED light source based on a color temperature scale factor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10349553B4 (de) * | 2003-06-25 | 2007-04-19 | Digitallicht Ag | Verfahren und Lichtnetzwerk zur Helligkeitsregelung und dynamischen Farbmischung von LED-Einheiten |
| EP1689212B1 (de) | 2005-02-02 | 2008-01-23 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Verfahren und Anordnung zum Dimmen von Lichtquellen |
| DE102010002072A1 (de) * | 2010-02-18 | 2011-08-18 | Osram Gesellschaft mit beschränkter Haftung, 81543 | Schaltungsanordnung und Verfahren zum Betreiben mindestens einer Leuchtdiode |
-
2011
- 2011-12-23 DE DE102011089885A patent/DE102011089885A1/de not_active Withdrawn
-
2012
- 2012-12-19 WO PCT/EP2012/076185 patent/WO2013092734A1/de not_active Ceased
- 2012-12-19 EP EP12813334.5A patent/EP2796001B1/de not_active Not-in-force
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2013092734A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2796001B1 (de) | 2019-02-20 |
| DE102011089885A1 (de) | 2013-06-27 |
| WO2013092734A1 (de) | 2013-06-27 |
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