WO2013090956A1 - Procédé et circuit pour générer de la lumière blanche au moyen de del - Google Patents

Procédé et circuit pour générer de la lumière blanche au moyen de del Download PDF

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Publication number
WO2013090956A1
WO2013090956A1 PCT/AT2012/000323 AT2012000323W WO2013090956A1 WO 2013090956 A1 WO2013090956 A1 WO 2013090956A1 AT 2012000323 W AT2012000323 W AT 2012000323W WO 2013090956 A1 WO2013090956 A1 WO 2013090956A1
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WO
WIPO (PCT)
Prior art keywords
led
type
current
branch
compensation
Prior art date
Application number
PCT/AT2012/000323
Other languages
German (de)
English (en)
Inventor
Michael Zimmermann
Original Assignee
Tridonic Gmbh & 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 & Co. Kg filed Critical Tridonic Gmbh & Co. Kg
Priority to ATGM9020/2012U priority Critical patent/AT15161U1/de
Publication of WO2013090956A1 publication Critical patent/WO2013090956A1/fr

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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D25/00—Control of light, e.g. intensity, colour or phase
    • G05D25/02—Control of light, e.g. intensity, colour or phase characterised by the use of electric means
    • 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
    • H05B45/28—Controlling the colour of the light using temperature feedback
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]

Definitions

  • the invention relates to a method and a circuit arrangement for.
  • Producing mixed light of a predetermined color, in particular of white light by mixing the longer-wavelength light emitted by at least one first LED with the shorter-wavelength light emitted by at least one second LED.
  • the boundary between the longer-wavelength and the shorter-wavelength light may, for example, be at 500 nm (with respect to the peak of the spectrum). It is known to produce mixed light of a predetermined color by mixing the light emitted by at least two LEDs, the light emitted from one LED and from the other LED having different wavelengths.
  • “warm” white light can be obtained by mixing the light emitted by a red light LED and by a color-converted blue light LED or UV light LED (this is, for example, an LED chip producing a blue light or UV light Alternatively, white light may also be produced by RGB (red, green, blue) mixture or other mixtures
  • RGB red, green, blue
  • Color location changes of the mixed light result: the higher the temperature rises in an LED module, the lower the intensity of the light emitted by the LEDs (with constant current through the LED).
  • the gradient of the intensity as a function of the temperature is decreasing or, in other words, the gradient is negative. This would not be a problem in terms of the color of the mixed light, if the negative gradient of the longer wavelength LED light and the shorter wavelength LED light would be about the same. In fact, however, the negative gradient of longer wavelength LED light is greater than the negative gradient of shorter wavelength LED light, with the result that the spectrum of the mixed light changes.
  • the efficiency of the phosphor layer may also be temperature-dependent.
  • a color location shift can occur, which is perceptible to the human eye.
  • the temperature dependence may also be manifested by a change in the color temperature.
  • WO 2011/054547 AI it is known to use a passive compensation branch in an LED drive circuit, which reduces the voltage at one or more LEDs of a series connection of LEDs as a function of the respective temperature by switching to ground.
  • part of the electric power is thermally converted by means of an NTC resistor, resulting in high power consumption.
  • the temperature-induced color change is compensated only insufficient.
  • the invention has for its object - counteract the adverse effect described and at the same time to achieve a high overall efficiency.
  • An operating circuit according to the invention is used to drive an LED track, which has different spectrum for generating mixed light, at least two LED types.
  • one LED type is a monochromatic, for example, red LED
  • the second type is a UV or blue, dye-converted white light LED.
  • the LED path has a main branch, which includes at least one LED.
  • the LED track also has a compensation branch.
  • the operating circuit is designed to act on the compensation branch with a compensation current.
  • the operating circuit is included designed to act on the compensation branch depending on a temperature signal as a signal from a temperature directly or indirectly sensing sensor with a compensation current, the compensation current depending on the temperature signal clocked, preferably PWM is modulated. So no or only little power flows to ground. A high efficiency is achieved. At the same time, a temperature change can be compensated.
  • the operating circuit further preferably has a processing device which adjusts the main current and the compensation current as a function of the temperature signal.
  • the sensor preferably has a PTC resistor or an NTC resistor or a thermistor or a voltmeter. So a very accurate compensation is possible.
  • the operating circuit has a switch which can be controlled by the processing device. The switch then has a first switching state and a second switching state. In the first switching state, the switch permits a flow of the compensation current through the compensation branch and, in the second switching state, no flow of the compensation current through the compensation branch.
  • the adjustment of the brightness ratios of the main branch and the compensation branch is very simple.
  • the processing device is designed to control the switch such that the timing, preferably the pulse width modulation (PWM) of the Perform compensation current.
  • PWM pulse width modulation
  • Pulse width modulation then takes place as a function of a current temperature.
  • the operating circuit preferably additionally has a return line which supplies a current temperature or a control parameter derived from a current temperature to a power source supplying it.
  • the main branch preferably has at least one LED of a first type.
  • the compensation branch further comprises at least one LED of a second type.
  • the main branch includes only LEDs of the first type or LEDs of the first type and the second type. So a simple structure is possible.
  • the main branch has at least one LED of a first type, while the compensation branch has no LED of a first type and no LED of a second type.
  • the main branch has at least one LED of a first type
  • the compensation branch has no LED of a first type and no LED of a second type.
  • the second LED type is preferably an optionally dye-converted red, amber-colored, orange, or infra-orange LED.
  • the first LED type is an optional dye converted blue light LED or UV light LED.
  • An inventive LED module includes an above-mentioned operating circuit and an LED track supplied by this.
  • An LED lamp according to the invention includes an above-mentioned LED module.
  • the LED lamp according to the invention further includes a power supply circuit.
  • the power supply circuit is then configured to set a total current for powering the LED module in response to a feedback signal corresponding to a current temperature or a control parameter derived from a current temperature.
  • the required power can be further reduced while the color temperature and the brightness of the LED track are very precisely adjustable.
  • the operating circuit can also act on the compensation branch depending on a directly or indirectly transmitted brightness signal or the supply voltage with a compensation current, the compensation current depending on the temperature signal clocked, preferably modulated pulse width modulated.
  • An inventive method is used to operate an LED track.
  • The. LED track then generates mixed light with at least two LED types of different spectrum.
  • the LED track includes a main branch which includes at least one LED.
  • a compensation branch is fed with an adjustable compensation current.
  • Compensation current is dependent on a direct or indirectly detected temperature signal clocked, preferably pulse width modulated.
  • 1 shows an exemplary LED lamp with an LED track
  • Fig. 2a shows a first embodiment of
  • Fig. 3 shows a third embodiment of
  • FIGS. 4a-4d show various signals within one
  • FIG. 5 shows a first embodiment of the
  • Fig. 6 shows a second embodiment of the method according to the invention.
  • FIG. 1 the problem underlying the present invention will be explained with reference to an exemplary LED lamp. Subsequently, by means of FIGS. 2a-4, the structure and mode of operation of various forms of the device according to the invention will be discussed. Finally, the mode of operation of the method according to the invention will be clarified with reference to FIGS. 5 to 6. Identical elements have not been repeatedly shown and described in similar figures.
  • LEDs that emit red light are representative of longer wavelength LEDs
  • white light emitting LEDs also referred to as “white or blue or color converted white or color converted blue LEDs” are representative of shorter wavelength LEDs stand.
  • the limit with respect to the peak of the spectrum between the longer-wavelength and the shorter-wavelength light may be, for example, 500 nm.
  • Fig. 1 shows an exemplary LED lamp. Only the inner structure is shown.
  • a power supply circuit 1 is connected directly to an LED module 2.
  • the power supply circuit 1 includes a rectifier module 3, which generates a smoothed direct current from an alternating current.
  • the alternating current is supplied to a grid connection 6.
  • Power supply circuit 1 still includes a Current source 4. This generates from the direct current, which is generated by the rectifier module 3, a constant direct current I LED , which is the LED module 2 is supplied. Alternatively, a voltage source can be used.
  • the LED module 2 consists here of a Se ienscrien numerous LEDs. These are white and red LEDs.
  • each LED is flowed through by the same total current I LED .
  • I LED total current
  • the LED lamp according to the invention includes a power supply circuit 10 and an LED module 11.
  • the structure of the power supply circuit 10 corresponds to the structure of the power supply circuit 1 of FIG. 1.
  • the rectifier module 12 corresponds to the rectifier module 3.
  • the current source 13 corresponds to the current source 4. Alternatively can also be used here a voltage source.
  • the total current I LED is generated by the power supply circuit 10 and supplied to the LED module 11.
  • the LED module 11 shown here is an LED module according to the invention.
  • the LED module 11 includes a Operating circuit 14a according to the invention and an LED track 15.
  • the LED section 15 here also consists of a series connection of a plurality of LEDs 20-26.
  • the LEDs 21-26 are white LEDs of a first type (w).
  • the LED 20 is a red LED of a second type (r).
  • the LED track 15 includes a compensating branch 32 connected in parallel. It is connected in parallel to a main branch 33, which here only contains the LED 26.
  • the grain pens branch 32 includes an ohmic resistor 28 and an LED 27.
  • the LED 27 is here of the second type (r).
  • the total current I LED is divided into a compensation current Ii and a main current I.
  • the compensation current Ii flows through the compensation branch 32, while the main current I2 flows through the main branch 33.
  • the ohmic resistor 28 serves only to equalize the voltage drop across the LED 27 to the voltage drop across the LED 26. Due to their different types (r, w), the LEDs 27 and 26 have a different voltage drop.
  • the operating circuit 14a in this case has a switch 29, which is controlled by a microcontroller 31.
  • the switch 29 is controlled by the microcontroller 31 such that a pulse width modulation is performed. That is, the ratio of the compensation current Ii to the main current I2 is adjusted by means of pulse width modulation by the switch 29. By adjusting the ratio between the compensation current Ii and the main current I2, the average brightness of the LED 27 and the LED 26 becomes set.
  • the pulse width modulation is set by the microcontroller 31 as a function of a current temperature.
  • the current temperature is determined by means of a sensor.
  • the sensor is a temperature-dependent resistor (PTC resistor) 30.
  • PTC resistor temperature-dependent resistor
  • NTC resistors or thermistors are conceivable.
  • a voltmeter can be used, which measures the falling across the entire LED track 15 voltage. Also with regard to this parameter results in a temperature characteristic.
  • the microcontroller 31 adjusts the pulse width modulation such that a constant color temperature of the LED path 15 results.
  • the total current I LED is fully used to operate the LEDs 20-27. This results in a very high overall efficiency.
  • the ohmic resistor 28 has only a very small value, since it only serves to compensate for the slightly different voltage drop of the different LED types (r, w). So has the ohmic resistance 28. only a very small negative impact on the overall efficiency.
  • Fig. 2b shows a second embodiment of the LED lamp according to the invention.
  • the embodiment corresponds largely to the embodiment of Fig. 2a.
  • the compensation branch 32a here corresponds to the compensation branch 32 of FIG. 2.
  • the compensation branch 32a does not include any components here, but merely represents a bridging of the main branch 33a connected through the switch 29.
  • the main branch 33a corresponds to the main branch 33, but instead contains the LED 26 of the first type (w) an LED 27a of the second type (r). Due to the targeted, preferably clocked circuit of the switch 29 and the resulting color temperature can be adjusted.
  • a third embodiment of the LED lamp according to the invention is shown. Compared to FIG. 2, only the operating circuit 14b is changed here.
  • a control of the total current ILED- additionally takes place here. This control takes place via a return line 35, which transmits a control signal of the microcontroller 31 to the current source 13 of the power supply circuit 10.
  • Such control serves to further improve the color stability.
  • the temperature changes the power requirement of an LED to achieve a constant brightness. Depending on their brightness, many LEDs have a color characteristic. That At different brightnesses of the operation results in a different color characteristic.
  • FIGS. 4a-4d Numerous signals in an LED lamp according to the invention are shown in the time sequence in FIGS. 4a-4d.
  • Fig. 4a shows the switching behavior of the switch 29 and thus the pulse width modulation. Before time t1, the switch is open for about the same amount of time as closed. After the time t 1, the turn-on time is significantly reduced.
  • the time t1 here corresponds to e.g. a clear one
  • Fig. 4d shows. the total current I LED . It can be clearly seen here that the total current I LED is constant both before the time t 1 and after the time t 1. However, if total current control is performed as a function of temperature, the total current also changes with the temperature change at tl.
  • Fig. 4b shows the compensation current Ii. It can be clearly seen here that the compensation current Ii flows during the switch-on time of the switch 29 and otherwise does not flow.
  • Fig. 4c of the Kleinström I 2 is shown. It can be clearly seen here that the main current I 2 is the total current I LED corresponds as long as the switch 29 is open. when the switch 29 is closed, the main flow I 2 corresponds to the total current I LE D minus the compensation current
  • the pulse width modulation takes place in an imperceptible to the human eye speed. For the human eye, this results in a color perception, which corresponds to the time average over the pulse width modulation.
  • FIG. 5 shows a first exemplary embodiment of the method according to the invention.
  • temperature parameters are determined. That is, a signal is measured, which reflects the temperature of the LED track as accurately as possible.
  • the brightness ratio to be set between the 'main branch and the compensation branch is determined, which is necessary to achieve a desired color temperature in the currently measured temperature.
  • the current temperature is first determined based on the measured temperature parameters.
  • the duty cycle of the pulse width modulation is determined.
  • the intermediate step on the determination of the current temperature can also be omitted.
  • the duty cycle is determined directly from the measured temperature parameters. This determination can be made via a calculation rule or via a table stored by the microcontroller.
  • a third step 42 the pulse width modulation determined in the second step 41 is performed. That is the Power through the compensation branch is switched on / off. Since the total current I LED distributed to the main branch and the compensation branch, the main current I2 is set at the same time. To be continued with the first step 40.
  • the sequence shown is repeated as often as desired during the entire operating life of the LED track. Since changes in temperature of the LED track are usually rather long-term nature, it is sufficient if the steps are performed at least once a minute, preferably at least once every 10 seconds, more preferably at least once a second.
  • the method illustrated here corresponds to the arrangement of FIG. 2.
  • FIG. 6 shows a second exemplary embodiment of the method according to the invention. The method shown here corresponds to the arrangement of FIG. 3.
  • Steps 50, 51 and 53 correspond to steps 40 - 42 of FIG. 5.
  • a step 52 is inserted between step 51 and step 53.
  • the necessary total current I LED is set based on the current temperature.
  • the operating circuit (14a, 14b) also act on the compensation branch (32) as a function of a directly or indirectly transmitted brightness signal or the supply voltage with a compensation current (Ii), the compensation current being dependent clocked by the temperature signal, preferably pulse width modulated (PM) is modulated.
  • a compensation current Ii
  • PM pulse width modulated

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention concerne un circuit de service (14a) qui sert à commander une ligne de DEL (15) comportant au moins deux types de DEL (r, w) de spectre différent pour générer une lumière mixte. La ligne de DEL (15) présente une branche principale (33) qui contient au moins une DEL (26, 27a). La ligne de DEL (15) présente en outre une branche de compensation (32, 32a). Le circuit de service (14a) est conçu pour appliquer un courant de compensation (I1)) à la branche de compensation (32, 32a). Le courant de compensation est cadencé, et de préférence soumis à une modulation de largeur d'impulsion (PWM), en fonction d'un signal de température qui est détecté directement ou indirectement par un capteur.
PCT/AT2012/000323 2011-12-23 2012-12-21 Procédé et circuit pour générer de la lumière blanche au moyen de del WO2013090956A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ATGM9020/2012U AT15161U1 (de) 2011-12-23 2012-12-21 Verfahren und Schaltungsanordnung zur Erzeugung von weißem Licht mittels LEDS

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102011089870 2011-12-23
DE102011089870.0 2011-12-23
DE102012203746.2 2012-03-09
DE102012203746A DE102012203746A1 (de) 2011-12-23 2012-03-09 Verfahren und Schaltungsanordnung zur Erzeugung von weissem Licht mittels LEDS

Publications (1)

Publication Number Publication Date
WO2013090956A1 true WO2013090956A1 (fr) 2013-06-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT2012/000323 WO2013090956A1 (fr) 2011-12-23 2012-12-21 Procédé et circuit pour générer de la lumière blanche au moyen de del

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AT (1) AT15161U1 (fr)
DE (1) DE102012203746A1 (fr)
WO (1) WO2013090956A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013215334A1 (de) * 2013-08-05 2015-02-05 Tridonic Gmbh & Co Kg Dimmbare LED-Leuchtmittelstrecke
US9504103B2 (en) * 2013-10-21 2016-11-22 Osram Sylvania Inc. Driving a multi-color luminaire
DE102015205808A1 (de) * 2015-03-31 2016-10-06 Osram Gmbh Schaltungsanordnung zum Betreiben zumindest einer ersten und genau einer zweiten Kaskade von LEDs
DE102015211454A1 (de) * 2015-06-22 2016-12-22 Tridonic Gmbh & Co Kg Sensorspeisung mit einem Konstantstrom-Konverter für Leuchtmittel
US10405383B2 (en) 2016-04-22 2019-09-03 Signify Holding B.V. Method of controlling a lighting arrangement, a lighting control circuit and a lighting system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100026191A1 (en) * 2006-10-06 2010-02-04 Koninklijke Philips Electronics N.V. Power supply device for light elements and method for supplying power to light elements
DE102009022070A1 (de) * 2009-05-20 2010-11-25 Osram Gesellschaft mit beschränkter Haftung Schaltung sowie Lampe umfassend die Schaltung
US20110068701A1 (en) * 2009-09-24 2011-03-24 Cree Led Lighting Solutions, Inc. Solid state lighting apparatus with compensation bypass circuits and methods of operation thereof
WO2011054547A1 (fr) 2009-11-09 2011-05-12 Tridonic Jennersdorf Gmbh Procédé et circuiterie permettant de produire une lumière led mixte d'une couleur prédéfinie

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100026191A1 (en) * 2006-10-06 2010-02-04 Koninklijke Philips Electronics N.V. Power supply device for light elements and method for supplying power to light elements
DE102009022070A1 (de) * 2009-05-20 2010-11-25 Osram Gesellschaft mit beschränkter Haftung Schaltung sowie Lampe umfassend die Schaltung
US20110068701A1 (en) * 2009-09-24 2011-03-24 Cree Led Lighting Solutions, Inc. Solid state lighting apparatus with compensation bypass circuits and methods of operation thereof
WO2011054547A1 (fr) 2009-11-09 2011-05-12 Tridonic Jennersdorf Gmbh Procédé et circuiterie permettant de produire une lumière led mixte d'une couleur prédéfinie

Also Published As

Publication number Publication date
DE102012203746A1 (de) 2013-06-27
AT15161U1 (de) 2017-01-15

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