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WO2011117024A1 - Procédé et dispositif de commutation pour commander une pluralité de del - Google Patents

Procédé et dispositif de commutation pour commander une pluralité de del Download PDF

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Publication number
WO2011117024A1
WO2011117024A1 PCT/EP2011/052181 EP2011052181W WO2011117024A1 WO 2011117024 A1 WO2011117024 A1 WO 2011117024A1 EP 2011052181 W EP2011052181 W EP 2011052181W WO 2011117024 A1 WO2011117024 A1 WO 2011117024A1
Authority
WO
WIPO (PCT)
Prior art keywords
led
duty cycle
led2
led1
current
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.)
Ceased
Application number
PCT/EP2011/052181
Other languages
German (de)
English (en)
Inventor
Oskar Schallmoser
Ralf Hying
Knut Asmussen
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.)
Osram GmbH
Original Assignee
Osram 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 Osram GmbH filed Critical Osram GmbH
Publication of WO2011117024A1 publication Critical patent/WO2011117024A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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]
    • H05B45/10—Controlling the intensity 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
    • H05B45/3725—Switched mode power supply [SMPS]
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to a method for operating a plurality of LEDs on a circuit arrangement with a supply terminal for coupling to a supply voltage, a reference potential terminal for coupling to a reference potential, at least a first parallel connection of at least a first LED and a first shorting switch for shorting the at least a first LED, at least one second parallel connection of at least one second LED and a second shorting switch for shorting the at least one second LED, a current source, the series circuit comprising the current source, the at least one first and the at least one second parallel connection between the supply terminal and the reference potential ⁇ alan gleich is coupled, and a control device, the at least one first output for driving the first short-circuit switch, a second output for driving the second short-circuit switch un d comprises at least one input for supplying at least one first control signal for setting an instantaneous brightness output of the at least one first LED and a second control signal for setting a momentary brightness output of the at least one second LED. It also relates to a
  • the present invention is an example of so-called AFS (Advanced Forward Lighting system) systems beschrie ⁇ ben, although, as apparent to those skilled in the art can also be used in other areas.
  • AFS Advanced Forward Lighting system
  • a large number of surface elements of a travel path or an environment with LEDs are to be illuminated differently in terms of time with varying degrees of brightness.
  • Individual surface elements must be ⁇ be lights dimmed while others, for example, functions in actuallyensitua-, even briefly with particularly high brightness.
  • the object of the present invention is therefore to develop a generic method or a generic circuit arrangement such that an increase in the efficiency is made possible.
  • This object is achieved by a method having the features of patent claim 1 and by a circuit arrangement having the features of patent claim 13.
  • the present invention is based on the recognition that the efficiency of an LED with respect to the momenta ⁇ NEN, the LED current flowing through is lower, the higher the current, the LED is the current flowing through.
  • the LEDs are powered by a power source that continuously supplies a constant current.
  • the brightness output currently to be set is achieved solely by driving the short circuit switch connected in parallel to the LED with a signal which has a duty cycle which leads to the setting of the instantaneous brightness output.
  • the present invention now goes to the solution of the above-described object, the way to vary the current supplied by the current source instantaneous current.
  • the instantaneous current of the current source is varied by the control device, specifically as a function of the instantaneous brightness output to be set of the at least one first LED and / or the at least one second LED.
  • the control device specifically as a function of the instantaneous brightness output to be set of the at least one first LED and / or the at least one second LED.
  • a first PWM signal is provided at the first output of the control device, which signal comprises a first PWM signal Duty cycle, and at the second output of the control device, a second PWM signal having a second Dy ⁇ cycle. Since these signals are coupled to the short-circuit ⁇ switches, the corresponding LED will thus operate with the respective inverse duty cycle.
  • the smaller of the at least two duty cycles is first determined on this basis. Subsequently, the smaller of the at least two duty cycles is reduced and the instantaneous current of the current source is lowered in such a way that the at least one LED operated with the smaller duty cycle outputs its brightness which is currently to be set. Finally, the at least one other duty cycle is reduced so that the NE with the at least one other duty cycle felde- at least one LED emits its currently adjusted Hel ⁇ ltechnik.
  • both LEDs on the one hand deliver their currently set brightness
  • the LEDs can be operated with a pos ⁇ lichst low power, being turned off on the smaller of the at least two duty cycles, since this is not lowered below 0% can be.
  • the smaller of the two duty cycles is preferred in this case to a duty cycle of not more than 10%, preferably Hoechsmann ⁇ least 5%, more preferably reduced to 0%. This resulted in an advantage to minimize the current flowing through the LED, and accordingly maximizing the effect ⁇ grads of the circuit arrangement.
  • the reduction of the duty cycles and the corresponding reduction of the instantaneous current of the current source takes place stepwise, in particular in predefinable stages. she carried out in particular so that the obtain from the LEDs ⁇ added brightness does not change.
  • the determining step that is the step in which the smaller of at least two duty cycle is determined, is repeated at predetermined intervals zeitli ⁇ chen. This will embarkge ⁇ assumed that the LEDs are operated for long periods of time as possible with an optimum ratio of the duty cycle and Momen- tanstrom.
  • a preferred development of the method according to the invention is characterized in that, moreover, is ⁇ telt ermit whether achievable with the current instantaneous current at a third predetermined duty cycle, in particular a duty cycle of 0%, a brightness output to be set the at least one LED. If the resulting ⁇ nis this determination is "no", is increased according to the invention of the instantaneous current. So, if even a duty cycle of 0% is no longer sufficient for short circuit switches to achieve high brightness output to be set at least one LED, the instantaneous current is again raised.
  • Increasing the instantaneous current in egg ⁇ nem step is preferably carried out, wherein the step is chosen such that at a fourth predetermined duty cycle, in particular a Duty cycle of 20%, preferably 0%, the Constant ⁇ alternate brightness output of the at least one LED it is ⁇ targetable.
  • the increase in one step allows ei ⁇ ne rapid response to a momentary brightness requirement, for example, in a dangerous situation.
  • this is performed such that the brightness output to be set is obtained at a lowest possible instantaneous ⁇ current of the current source.
  • the maximum instantaneous current is the rated current of the at least one LED. This ensures that the LED will not be damaged even if it has to emit high brightness over a longer period of time.
  • the maximum instantaneous current can be the maximum pulse current of the at least one LED. As a result, particularly high levels of brightness can be achieved, in particular at certain points, whereby it is again ensured that the LEDs affected thereby and the components of the circuit arrangement are not damaged.
  • the at least one other duty cycle is advantageously Cycle increased so that at least one LED, the short-circuit switch is operated with the at least one other Dy-Cycle, outputs their currently set brightness. This ensures that all LEDs output their currently set brightness.
  • another preferred embodiment of the invention takes into account the fact that, if the instantaneous current already exists, the current source a brightness request occurs that can not be adjusted by means of a pre- ⁇ given duty cycle in this minimum instantaneous current, since it is below.
  • the invention therefore, it is further provided that it is determined whether a brightness output of the at least one LED to be set can be achieved with the current duty cycle at a minimum instantaneous current of the current source. If this is not the case, since the adjustable at the ge ⁇ gen stiirtigen duty cycle brightness output Ü is over the adjusted brightness output, it is ⁇ -making according to the duty cycle increases, runs the short ⁇ switch the relevant LED.
  • the invention therefore enables an extremely wide dynamic range of the brightness to be emitted by the LEDs, which could not be achieved using the prior art procedure.
  • FIG. 1 shows a schematic illustration of an exemplary embodiment of a circuit arrangement according to the invention
  • Fig. 2 shows the time course of various signals from
  • Fig. 1 in a known from the prior art method
  • Fig. 3 shows the time course of various signals from
  • Fig. 4 shows the time course of various signals from
  • FIG. 1 of a second embodiment of a method according to the invention.
  • Fig. 1 shows a schematic representation of an embodiment of an inventive Heidelbergungsanord ⁇ tion.
  • This includes several LEDs, in this case LED1, LED2, LED3, each LED being a short-circuiting switch in parallel is connected, in this case the LEDl the Kurz gleichschal ⁇ ter KS1, the LED2 of the short-circuit switch KS2 and the LED3 of the short-circuit switch KS3.
  • each short-circuiting switch only one LED is connected in parallel, can of course each short-circuiting switch, a LED strand a plurality of serially gekop ⁇ pelte LEDs be fully connected in parallel.
  • a current source I Q is connected in series with these parallel circuits , the combination of current source I Q and the several parallel circuits being coupled between a supply voltage V C c and a reference potential.
  • the current source I Q is designed to deliver a rated current Io.
  • the current current provided by the current source I Q is denoted by I.
  • the current source I Q preferably comprises a switching regulator and a Freilaufdi ⁇ ode and thus operates at very low losses.
  • the circuit arrangement further comprises a control device 10, having an input St, to which control signals for setting a momentary brightness output of the LED1, LED2, LED3 are supplied.
  • the individual control signals can be provided serially at the input St. Alternatively, a plurality of such inputs St may be provided.
  • the control device 10 here has three outputs and that an output AI for driving the first short-circuit switch KS1, an off ⁇ gear A2 for driving the second short-circuit switch KS2 A3 and an output for driving the third short-circuit switch KS3.
  • the signals provided at the outputs AI to A3 are each PWM signals, which are characterized by a respective current duty cycle, that is, a current duty cycle.
  • the signal provided at the output signal AI is ⁇ be labeled Sl
  • the signal provided at the output A2 is connected to S2 and the signal provided at the output A3 is denoted by S3.
  • the duty cycle of the signal Sl is Dl
  • that of the signal S2 is D2
  • that of the signal S3 is D3.
  • the control device 10 also has an output A4, which is gekop ⁇ pelt to a control input of the current source and through which the istge ⁇ surrounded by the current source I Q instantaneous current I can be adjusted.
  • Fig. 2 shows a schematic representation of the temporal
  • the signal S 1 is complementary to the signal Sl, the
  • the representation of the signals Si, S2 and S3 has the reason that they derwe the sequence as ⁇ , according to which the respective LED emits light.
  • the circuit arrangement according to the prior art is operated (without connection between the control device 10 and current source I Q ).
  • the current source I Q continuously supplies the rated current Io.
  • the duty cycle of the signal Sl is 50%
  • the duty cycle of the signal S2 is 90%
  • the duty cycle of the signal S3 is 70% (corresponding to the Duty cycle of signal S 3 30%)
  • the circuit arrangement of FIG. 1 is operated according to the method according to the invention.
  • the LEDs should deliver the same brightness in the method of FIG. 2.
  • the control device 10 is adapted to determine the smallest duty cycle of the Sig ⁇ dimensional Sl, S2 and S3 of FIG. 2. This is above the signal Sl (50%).
  • the control device 10 is further designed to reduce the smallest duty cycle, in the present case Sl, as far as possible, that is to say in the present case to 0%.
  • the instantaneous current I of the current source I Q is correspondingly lowered, that is to say below IQ / 2, that is to say according to the efficiency characteristics of the LEDs, to less than half of the nominal current Io, which results in the efficiency advantage of the present invention.
  • the typical value is 0.4 * Io.
  • the duty cycle Si is now 100% to achieve the desired brightness output of the LED1.
  • the duty cycles of the further signals S2, S3 are adapted accordingly. After adjustment, the duty cycle S2 is accordingly
  • the instantaneous current I is increased again.
  • the increase is preferably such that the smallest duty cycle of the signals Sl, S2, S3 is 0%.
  • the per ⁇ wells other duty cycle will be adjusted accordingly. If it is determined that with the current duty cycle at a minimum instantaneous current I of the current source I Q a brightness output of at least one LED to be set is no longer achievable, since the brightness output which can be set using the present duty cycle lies above the brightness output to be set, the Duty cycles, with which the short circuit of the LEDs are operated, again increased accordingly.
  • control device 10 it can be provided that the above-mentioned checking steps are carried out at predeterminable time intervals or when the control signals at the input St. change. If the brightness emitted by the LEDs is fed to a control circuit, the control device 10 can carry out the set checking step if reason of the control loop results in a change in the control of the short-circuit switch KS1 to KS3.
  • FIG. 4 shows the operation of the circuit arrangement of FIG. 1 according to a further exemplary embodiment of the method according to the invention.
  • the LED 2 Since during the period T2 the LED 2 is to emit the same brightness as during the period T 1, the duty cycle of the signal S 2 in the ratio rated current to maximum learning pulse current, taking into account the efficiency characteristic of the LED2 reduced.
  • the instantaneous current I is lowered again to the nominal current Io, or, if the operation of the LED3 makes this possible, even further.
  • the period T max may be, for example, between 1 ms and 100 ms, preferably 20 ms.

Landscapes

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

Abstract

La présente invention concerne un procédé servant à commander une pluralité de DEL (DEL1, DEL2, DEL3) dans un agencement de commutation avec une borne d'alimentation pour le couplage à une tension d'alimentation (VCC) ; une borne de potentiel de référence pour le couplage à un potentiel de référence ; au moins un premier circuit en parallèle d'au moins une première DEL (DEL1) et d'un premier commutateur de mise en court-circuit (KS1) pour mettre en court-circuit la ou les première(s) DEL (DEL1) ; au moins un deuxième circuit en parallèle d'au moins une deuxième DEL (DEL2) et d'un deuxième commutateur de mise en court-circuit (KS2) pour mettre en court-circuit la ou les deuxième(s) DEL (DEL2) ; une source de courant (IQ), le circuit en série sortant de la source de courant (IQ) étant couplé au(x) premier(s) et au(x) deuxième(s) circuit(s) en parallèle entre la borne d'alimentation et la borne de potentiel de référence ; et un dispositif de commande (10) qui comprend au moins une première sortie (A1) pour commander le premier commutateur de mise en court-circuit (KS1) ; une deuxième sortie (A2) pour commander le deuxième commutateur de mise en court-circuit (KS2) ; et au moins une entrée (St) pour acheminer au moins un premier signal de commande servant à instaurer une production de clarté momentanée de la ou des première(s) DEL (DEL1) et un deuxième signal de commande servant à instaurer une production de clarté momentanée de la ou des deuxième(s) DEL (DEL2) ; le courant momentané (I)de la source de courant (IQ) à travers le dispositif de commande (10) variant en fonction de la production de clarté momentanée à instaurer de la ou des première(s) DEL (DEL1) et/ou de la ou des deuxième(s) DEL (DEL2). Elle concerne en outre un agencement de commutation correspondant pour commander une pluralité de DEL (DEL1, DEL2, DEL3).
PCT/EP2011/052181 2010-03-25 2011-02-15 Procédé et dispositif de commutation pour commander une pluralité de del Ceased WO2011117024A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010003244.1 2010-03-25
DE102010003244A DE102010003244A1 (de) 2010-03-25 2010-03-25 Verfahren und Schaltungsanordnung zum Betreiben einer Vielzahl von Leds

Publications (1)

Publication Number Publication Date
WO2011117024A1 true WO2011117024A1 (fr) 2011-09-29

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013170397A1 (fr) * 2012-05-16 2013-11-21 钰瀚科技股份有限公司 Procédé d'actionnement de dispositif d'éclairage et dispositif comprenant une diode électroluminescente
CN112180242A (zh) * 2020-10-15 2021-01-05 东莞飞思凌通信技术有限公司 一种高密度芯片的ddr接口电路故障诊断的方法和装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203072200U (zh) * 2012-12-12 2013-07-17 欧司朗股份有限公司 电流补偿装置和具有该电流补偿装置的照明设备
DE102016207732A1 (de) * 2016-05-04 2017-11-09 Bayerische Motoren Werke Aktiengesellschaft Beleuchtungsvorrichtung

Citations (4)

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Publication number Priority date Publication date Assignee Title
US20080001547A1 (en) * 2005-09-20 2008-01-03 Negru Sorin L Driving parallel strings of series connected LEDs
US20080191642A1 (en) * 2005-04-08 2008-08-14 Wart Hog Ii Holding B.V. Methods and Apparatus for Operating Groups of High-Power Leds
WO2009072058A2 (fr) * 2007-12-07 2009-06-11 Koninklijke Philips Electronics N.V. Système et procédé de gestion de puissance de lampe à diodes électroluminescentes
WO2009157763A2 (fr) * 2008-06-24 2009-12-30 Eldolab Holding B.V. Unité de commande pour un ensemble de diodes électroluminescentes et système d’éclairage

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7633463B2 (en) * 2004-04-30 2009-12-15 Analog Devices, Inc. Method and IC driver for series connected R, G, B LEDs
WO2009029553A2 (fr) * 2007-08-24 2009-03-05 Cirrus Logic, Inc. Commande multi-del
DE102007044476A1 (de) * 2007-09-18 2009-03-19 Osram Gesellschaft mit beschränkter Haftung Beleuchtungseinheit und Verfahren zur Ansteuerung der Beleuchtungseinheit
DE102007053481B4 (de) * 2007-11-09 2020-01-02 Diehl Aerospace Gmbh Verfahren zum Dimmen von Lichtquellen ausgebildet zum Erzeugen von Mischlichtfarben

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080191642A1 (en) * 2005-04-08 2008-08-14 Wart Hog Ii Holding B.V. Methods and Apparatus for Operating Groups of High-Power Leds
US20080001547A1 (en) * 2005-09-20 2008-01-03 Negru Sorin L Driving parallel strings of series connected LEDs
WO2009072058A2 (fr) * 2007-12-07 2009-06-11 Koninklijke Philips Electronics N.V. Système et procédé de gestion de puissance de lampe à diodes électroluminescentes
WO2009157763A2 (fr) * 2008-06-24 2009-12-30 Eldolab Holding B.V. Unité de commande pour un ensemble de diodes électroluminescentes et système d’éclairage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013170397A1 (fr) * 2012-05-16 2013-11-21 钰瀚科技股份有限公司 Procédé d'actionnement de dispositif d'éclairage et dispositif comprenant une diode électroluminescente
CN112180242A (zh) * 2020-10-15 2021-01-05 东莞飞思凌通信技术有限公司 一种高密度芯片的ddr接口电路故障诊断的方法和装置

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