EP1372359A1 - Circuit d'alimentation pour plusieurs chaínes de DEL - Google Patents

Circuit d'alimentation pour plusieurs chaínes de DEL Download PDF

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Publication number
EP1372359A1
EP1372359A1 EP03011739A EP03011739A EP1372359A1 EP 1372359 A1 EP1372359 A1 EP 1372359A1 EP 03011739 A EP03011739 A EP 03011739A EP 03011739 A EP03011739 A EP 03011739A EP 1372359 A1 EP1372359 A1 EP 1372359A1
Authority
EP
European Patent Office
Prior art keywords
led
control circuit
strand
current flowing
led strand
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03011739A
Other languages
German (de)
English (en)
Other versions
EP1372359B1 (fr
Inventor
Alois Biebl
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
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP1372359A1 publication Critical patent/EP1372359A1/fr
Application granted granted Critical
Publication of EP1372359B1 publication Critical patent/EP1372359B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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]
    • H05B45/30—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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology
    • 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]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology
    • 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]
    • H05B45/385—Switched mode power supply [SMPS] using flyback topology

Definitions

  • the present invention relates to a control circuit for at least one LED strand, whereby a switch is arranged in series with each LED strand and each LED strand has one Has supply connection, via which it can be connected to a supply voltage, wherein each switch can be controlled such that a current flow in the associated LED string is made possible with a first control circuit, which is designed to switch the minimum to control an LED string in such a way that an adjustable mean value of the LED strand flowing through current is achieved.
  • FIG. 1 shows such a control circuit in which, for example, an LED string is formed by four LEDs D1 to D4.
  • a switch T1 is arranged on one side of the LED string and is connected on the one hand to a control circuit and on the other hand to a supply voltage U V.
  • the LED string is connected to ground via a shunt resistor R Sh .
  • the voltage drop across the resistor R Sh Sh voltage U is applied to an integrator 10 which provides at its output a size corresponding to the mean value i LED corresponds to the current i LED flowing through the LED string.
  • a comparator 12 provides at its output a control voltage U control ready to be supplied to a further comparator fourteenth Its second input is supplied with the triangular voltage U D provided by a triangular generator 16. Its output is connected to the control input of switch T1.
  • i LED target can be the average i LEDs of the current through the LED string vary and thus change the brightness of the light emitted by LEDs D1 to D4, ie dim.
  • This control circuit has several disadvantages: for example, when operating such an LED string in a motor vehicle, it must be expected that the supply voltage U V , for example the on-board voltage, is not constant.
  • the coordination of the number of LEDs in the LED string must therefore be selected so that even with a minimal supply voltage U V, a sufficiently high current can be achieved through the LED string to ensure a certain minimum brightness of the LEDs. If the entire supply voltage is now always applied to the LED strand in order to achieve a high degree of efficiency, an increase in the supply voltage leads to an increase in the peak current flowing through the LED strand, see the thinly drawn curves in the middle illustration in FIG. 2.
  • LEDs have a negative temperature coefficient of several millivolts per degree Celsius.
  • FIG. 2 shows the peak current ⁇ LED at various temperatures as an example in thick lines.
  • i LED is set, the peak current ⁇ LED varies considerably.
  • the LED string is triggered in a pulsed manner, with the pauses between two successive pulses being larger at higher temperatures.
  • the wavelength of the light emitted by the LEDs in turn changes undesirably.
  • the switching element a series resistor upstream.
  • the energy converted in the series resistor leads to an additional increase of the ambient temperature and thus reinforces the negative effect.
  • the object of the present invention is therefore to provide a control circuit for the type mentioned at the outset in such a way that even when the supply voltage changes and the ambient temperature an operation of the LED string to deliver Guaranteed light in the desired brightness and color with high efficiency can be.
  • the first-mentioned object is achieved by a control circuit with the features of Claim 1.
  • the second object is achieved by a method with the Features of claim 14.
  • the invention is based on the knowledge that the above objects can be achieved in an ideal manner if the peak value ⁇ LED of the current flowing through the LED strand is determined and the supply voltage provided to the LED strand is regulated in a corresponding manner.
  • the mean i LED of the current flowing through the LED strand is regulated, the brightness of the light emitted by the LEDs is kept constant and adjustable.
  • the color of the light emitted by the LED strand is kept adjustable and adjustable. If the supply voltage that is provided for the LED string is then designed so that as little energy as possible is converted into heat, a particularly high degree of efficiency can be achieved. This also enables LED strings to be implemented with any number of LEDs, ie when the peak current is specified, it does not matter whether the control circuit is used to operate an LED strand with 5 or 10 LEDs.
  • the at least one LED strand is preferably operated in a clocked manner, the mean value of the current flowing through the at least one LED strand, in particular by pulse width modulation is set.
  • the eye takes over the function of the integrator. As long as the LEDs are always operated with the same peak current, changes only the brightness of the light emitted by the LEDs, but not its color.
  • the second control loop is preferred in view of a particularly high efficiency designed, the supply voltage of the string voltage of the at least one LED string adapt.
  • the first and second control loops are designed Determine actual values for mean and peak value only for a first LED string wherein at least a second LED strand corresponds to that for the first LED strand determined actual values is operated.
  • This measure can be made up of several LED arrays of existing LED arrays while achieving the advantages according to the invention control, but the two control loops are only executed once.
  • the first control loop can have a first comparator with which the actual value of the Average value of the current flowing through the at least one LED strand with a specifiable one Setpoint value is compared, with the output signal of the first comparator on the input of a second comparator is coupled, the second input of which is connected to a Triangle signal is applied, the output signal of the second comparator to the at least one switch is coupled.
  • the second control loop can have a third comparator with which the actual value of the Peak value of the current flowing through the at least one LED strand with a predeterminable one Setpoint value is compared, with the output signal of the third comparator on the first input of a fourth comparator is coupled, the second input of a triangular signal is applied, the output signal of the fourth comparator is coupled to a voltage converter.
  • the average of the minimum a current flowing through an LED strand can be changed by an operator.
  • the wavelength of the emitted by the LED strand Light the peak value of the current flowing through the at least one LED strand be designed to be changeable by an operator.
  • the second control loop comprises a peak value detector for the current flowing through the at least one LED strand, a peak value can be predetermined for the current flowing through the at least one LED strand and the second control loop is designed to provide a supply voltage so that the predeterminable peak value is achieved. This results in an optimal adaptation of the supply voltage U V to the LED string voltage U St.
  • the second control circuit preferably comprises a DC / DC converter, the output voltage of which is coupled to the at least one supply connection.
  • the DC / DC converter is preferred in particular as a step-up converter, step-down converter or flyback converter.
  • An inductance is preferably arranged in series with the output of the second control circuit.
  • FIG. 3 shows a control circuit according to the invention, the circuit component in the right half of FIG. 3 essentially corresponding to the control circuit shown in FIG. 1.
  • the drop across the resistor R Sh Sh voltage U is supplied to a peak detector 18 whose output signal is correlated with the actual peak value I LEDact and a comparator is supplied stirred 20th
  • the adjustable peak value ⁇ LED setpoint is present at the other input of the comparator 20.
  • One of the difference between ⁇ ⁇ LEDact LEDnom and corresponding voltage U Rule2 is supplied to a further comparator 22 whose other input is driven with a triangular voltage U D2.
  • the output signal of the comparator 22 is present at the control input of a switch T2, which is connected to the supply voltage U V.
  • a diode D is arranged in the reverse direction between the output of the switch T2 and ground.
  • An inductance L is arranged in series between the output of the switch T2 and the supply voltage connection of the switch T1.
  • the T1-side connection of inductance L is connected to ground via a capacitor C.
  • the voltage U A provided by the capacitor C is preferably selected such that it is essentially equal to the phase voltage U St.
  • a step-down converter is realized in the present case by the comparator 22, the switch T2 and the diode D and the triangular generator 21, which provides the voltage U D2 .
  • the comparator 22 the switch T2 and the diode D and the triangular generator 21, which provides the voltage U D2 .
  • other types of converters in particular DC / DC converters, can also be present at this point in the circuit, depending on the application.
  • the oscillator frequency of the triangle generator 16 should preferably be chosen to be substantially lower than the oscillator frequency of the triangle generator 21.
  • the integrator 10 can be differently outlined, that is, differently than by an RC element , be realized.
  • the peak value detector 18 can be implemented differently than by a diode-capacitor combination.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)
  • Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
EP03011739A 2002-06-10 2003-05-23 Circuit d'alimentation pour plusieurs chaînes de DEL Expired - Lifetime EP1372359B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10225670A DE10225670A1 (de) 2002-06-10 2002-06-10 Ansteuerschaltung für mindestens einen LED-Strang
DE10225670 2002-06-10

Publications (2)

Publication Number Publication Date
EP1372359A1 true EP1372359A1 (fr) 2003-12-17
EP1372359B1 EP1372359B1 (fr) 2007-02-21

Family

ID=29557718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03011739A Expired - Lifetime EP1372359B1 (fr) 2002-06-10 2003-05-23 Circuit d'alimentation pour plusieurs chaînes de DEL

Country Status (6)

Country Link
US (1) US7061394B2 (fr)
EP (1) EP1372359B1 (fr)
CN (1) CN100469208C (fr)
AT (1) ATE354930T1 (fr)
CA (1) CA2431514A1 (fr)
DE (2) DE10225670A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1871144A1 (fr) * 2006-06-22 2007-12-26 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Dispositif d'excitation de diodes électroluminescentes et procédé correspondant
WO2014049216A1 (fr) * 2012-09-28 2014-04-03 Renault S.A.S. Procédé d'élaboration d'une consigne de fonctionnement pour un ensemble de diodes d'éclairage d'un projecteur de véhicule, et véhicule correspondant
EP2420107B1 (fr) 2009-04-14 2015-07-08 Tridonic GmbH & Co KG Régulation de la puissance de del, à l'aide de la moyenne du courant des del et d'un compteur bidirectionnel
WO2016173776A1 (fr) * 2015-04-30 2016-11-03 Osram Gmbh Ensemble formant circuit et procédé de réduction de la modulation de lumière d'au moins une source de lumière commandée par une tension
AT519021A5 (de) * 2009-04-14 2018-03-15 Tridonic Gmbh & Co Kg Leistungsregelung von led, mittels mittelwert des led-stroms und bidirektionaler zähler

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US6836157B2 (en) * 2003-05-09 2004-12-28 Semtech Corporation Method and apparatus for driving LEDs
DE102004003698B4 (de) * 2004-01-24 2005-11-24 Preh Gmbh Schaltungsanordnung zur Ansteuerung von Leuchtmitteln
US7824627B2 (en) 2004-02-03 2010-11-02 S.C. Johnson & Son, Inc. Active material and light emitting device
US7202608B2 (en) * 2004-06-30 2007-04-10 Tir Systems Ltd. Switched constant current driving and control circuit
JP4646110B2 (ja) * 2004-10-22 2011-03-09 株式会社中川研究所 半導体発光素子用電源および照明装置
US7492108B2 (en) * 2005-08-11 2009-02-17 Texas Instruments Incorporated System and method for driving light-emitting diodes (LEDs)
GB2440603B (en) * 2005-09-12 2008-11-12 Lee Alan Bourgeois A shunt that allows a vehicle with pulsed lamp checking to use light emitting diodes
WO2007041574A1 (fr) 2005-10-03 2007-04-12 S. C. Johnson & Son, Inc. Appareil lumineux
TWI433588B (zh) 2005-12-13 2014-04-01 Koninkl Philips Electronics Nv 發光二極體發光裝置
WO2007088505A1 (fr) 2006-01-31 2007-08-09 Koninklijke Philips Electronics N.V. Circuit d'attaque de del
US7456586B2 (en) * 2006-01-31 2008-11-25 Jabil Circuit, Inc. Voltage controlled light source and image presentation device using the same
US7307391B2 (en) * 2006-02-09 2007-12-11 Led Smart Inc. LED lighting system
US8063581B2 (en) * 2006-06-22 2011-11-22 Koninklijke Philips Electronics N.V. Drive circuit for driving a load with pulsed current
US7705547B2 (en) * 2006-10-19 2010-04-27 Honeywell International Inc. High-side current sense hysteretic LED controller
DE102006059355A1 (de) * 2006-12-15 2008-06-19 Robert Bosch Gmbh Ansteuerungseinrichtung und Verfahren zum Betrieb wenigstens einer Reihenschaltung von Leuchtdioden
US7898187B1 (en) * 2007-02-08 2011-03-01 National Semiconductor Corporation Circuit and method for average-current regulation of light emitting diodes
CN101106852B (zh) * 2007-06-25 2010-12-08 四川大学 照明发光二极管阵列的恒流和调光控制电路
US20090115343A1 (en) * 2007-11-06 2009-05-07 Brian Matthew King LED Power Regulator with High-Speed LED Switching
WO2009136318A1 (fr) 2008-05-06 2009-11-12 Koninklijke Philips Electronics N.V. Unité de pilotage de del
IT1391326B1 (it) * 2008-07-21 2011-12-05 Mt Lights S R L "alimentatore elettronico di potenza di diodi led"
US8350498B2 (en) * 2010-04-28 2013-01-08 National Semiconductor Corporation Dynamic current equalization for light emitting diode (LED) and other applications
CN102387627B (zh) 2010-09-03 2015-07-29 奥斯兰姆有限公司 发光二极管驱动及调光的方法和装置、以及照明系统
US8395331B2 (en) * 2010-10-05 2013-03-12 Semtech Corporation Automatic dropout prevention in LED drivers
CN102055324A (zh) * 2011-01-11 2011-05-11 北方工业大学 采用积分电路的电源控制装置及方法
DE202012100109U1 (de) 2012-01-12 2012-02-27 Productivity Engineering Gesellschaft für Prozessintegration mbH Schaltungsanordnung zum Betreiben von LED-Lichtquellen
FR2996403B1 (fr) * 2012-09-28 2015-05-22 Renault Sa Procede de regulation de la tension aux bornes d'un ensemble de diodes d'eclairage d'un projecteur de vehicule, et vehicule correspondant
DE102012224346A1 (de) * 2012-12-21 2014-06-26 Osram Gmbh Schaltungsanordnung zum Betreiben von n parallel geschalteten Strängen mit mindestens einer Halbleiterlichtquelle
CN103199506B (zh) * 2013-04-12 2015-07-15 深圳市华星光电技术有限公司 光源驱动模组的过流保护电路及背光模组
DE102022200429A1 (de) 2022-01-17 2023-07-20 Osram Gmbh Zweistufiges betriebsgerät mit isolierbarem getakteten konverter als leistungsfaktorkorrektor und regelungsverfahren für das betriebsgerät

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1871144A1 (fr) * 2006-06-22 2007-12-26 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Dispositif d'excitation de diodes électroluminescentes et procédé correspondant
WO2007147724A1 (fr) * 2006-06-22 2007-12-27 Osram Gesellschaft mit beschränkter Haftung Dispositif de commande pour led et procédé connexe
US8143810B2 (en) 2006-06-22 2012-03-27 Osram Ag Drive device for LEDs and related method
EP2420107B1 (fr) 2009-04-14 2015-07-08 Tridonic GmbH & Co KG Régulation de la puissance de del, à l'aide de la moyenne du courant des del et d'un compteur bidirectionnel
AT519021A5 (de) * 2009-04-14 2018-03-15 Tridonic Gmbh & Co Kg Leistungsregelung von led, mittels mittelwert des led-stroms und bidirektionaler zähler
AT519021B1 (de) * 2009-04-14 2018-03-15 Tridonic Gmbh & Co Kg Leistungsregelung von led, mittels mittelwert des led-stroms und bidirektionaler zähler
WO2014049216A1 (fr) * 2012-09-28 2014-04-03 Renault S.A.S. Procédé d'élaboration d'une consigne de fonctionnement pour un ensemble de diodes d'éclairage d'un projecteur de véhicule, et véhicule correspondant
FR2996404A1 (fr) * 2012-09-28 2014-04-04 Renault Sa Procede d'elaboration d'une consigne de fonctionnement pour un ensemble de diodes d'eclairage d'un projecteur de vehicule, et vehicule correspondant
WO2016173776A1 (fr) * 2015-04-30 2016-11-03 Osram Gmbh Ensemble formant circuit et procédé de réduction de la modulation de lumière d'au moins une source de lumière commandée par une tension

Also Published As

Publication number Publication date
CN1469694A (zh) 2004-01-21
ATE354930T1 (de) 2007-03-15
US20030227265A1 (en) 2003-12-11
CN100469208C (zh) 2009-03-11
CA2431514A1 (fr) 2003-12-10
DE50306558D1 (de) 2007-04-05
DE10225670A1 (de) 2003-12-24
EP1372359B1 (fr) 2007-02-21
US7061394B2 (en) 2006-06-13

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