EP1372359B1 - Circuit d'alimentation pour plusieurs chaînes de DEL - Google Patents

Circuit d'alimentation pour plusieurs chaînes de DEL Download PDF

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Publication number
EP1372359B1
EP1372359B1 EP03011739A EP03011739A EP1372359B1 EP 1372359 B1 EP1372359 B1 EP 1372359B1 EP 03011739 A EP03011739 A EP 03011739A EP 03011739 A EP03011739 A EP 03011739A EP 1372359 B1 EP1372359 B1 EP 1372359B1
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EP
European Patent Office
Prior art keywords
led
strand
drive circuit
led strand
circuit according
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.)
Expired - Lifetime
Application number
EP03011739A
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German (de)
English (en)
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EP1372359A1 (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
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Publication of EP1372359A1 publication Critical patent/EP1372359A1/fr
Application granted granted Critical
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    • 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 drive circuit for at least one LED string, wherein a switch is arranged serially to each LED string and each LED string has a supply terminal, 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 loop, which is designed to control the switch of the at least one LED string such that an adjustable mean value of the current flowing through the LED string is achieved.
  • FIG. 1 shows such a drive circuit in which, by way of example, an LED string is formed by four LEDs D1 to D4.
  • a switch T1 is arranged, which is connected on the one hand with a control circuit, on the other hand with 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 of the LED to LED strand current flowing through LED i.
  • the actual average value of the current I LED corresponding quantity I LEDact is an input of a comparator 12 fed to the other input is supplied to a size that corresponds to a set value of the current i ⁇ LED through the LED string, namely i ⁇ LEDsoll .
  • the comparator 12 provides at its output a control voltage U rule , which is supplied to a further comparator 14. Its second input is supplied with the triangle voltage U D provided by a triangular generator 16. Its output is connected to the control input of the switch T1.
  • the mean value i ⁇ LED of the current through the LED string can be varied and thus the brightness of the light emitted by the LEDs D1 to D4 can be changed, ie dimmed.
  • This drive circuit has several disadvantages: For example, when operating such a LED string in a motor vehicle is thus expected that the supply voltage U V , for example, the on-board voltage is not constant.
  • the tuning of the number of LEDs of the LED string is therefore to be chosen so that even with minimal supply voltage U V a sufficiently high current can be achieved through the LED string to ensure a certain Mindcsthellmaschine the LEDs.
  • the entire supply voltage is always applied to the LED string in order to achieve high efficiency, an increase in the supply voltage leads to an increase in the peak current flowing through the LED string, see the thinly drawn curves in the middle illustration of FIG
  • the air conditioner is turned on, this voltage jump can lead to a sudden change in the supply voltage available for the supply of the LED string.
  • a different peak current will shift the wavelength of the light emitted by the LED, which can then be distracting.
  • LEDs have a negative temperature coefficient of several millivolts per degree Celsius.
  • Figure 2 shows in thick lines by way of example the peak current î LED at different temperatures.
  • the peak current î LED varies considerably. At low temperatures, as shown on the left, the peak current is much lower than at higher temperatures, see illustration on the right.
  • the LED string is driven in a pulse-like manner, whereby at higher temperatures the pauses between two successive ones Pulses are larger to choose.
  • the wavelength of the light emitted by the LEDs again undesirably changes.
  • the object of the present invention is to develop a drive circuit of the type mentioned in such a way that even with changes in the supply voltage and the ambient temperature operation of the LED string for emitting light in the desired brightness and desired color can be ensured at high efficiency.
  • the first-mentioned object is achieved by a drive circuit having the features of patent claim 1.
  • the second-mentioned object is achieved by a method having the features of patent claim 14.
  • the invention is based on the finding that the above objects can be achieved in an ideal manner when the peak value î LED of the current flowing through the LED string is determined and the supply voltage provided to the LED string is regulated in a corresponding manner.
  • the mean value î LED of the current flowing through the LED string By controlling the mean value î LED of the current flowing through the LED string, the brightness of the light emitted by the LEDs is adjustably kept constant.
  • the color of the light output from the LED string is kept constant adjustable. If then the supply voltage that is provided to the LED string is designed so that as little energy is converted into heat, a particularly high efficiency can be realized. This also makes it possible to realize LED strings with an arbitrary number of LEDs, ie when the peak current is specified, it does not matter whether the triggering circuit is used to operate an LED string with 5 or 10 LEDs.
  • the color of the light emitted by the LEDs can be set in a targeted manner by the present invention.
  • the regulation of the peak LED current î LED to a predefinable value ensures that the pulse load capacity of the LEDs is never exceeded.
  • the at least one LED string is operated clocked, wherein the mean value of the at least one LED strand flowing through current is adjusted in particular by pulse width modulation.
  • the eye takes over the function of the integrator. As long as the LEDs are always operated at the same peak current level, only the brightness of the light emitted by the LEDs changes, but not its color.
  • the second control circuit is designed with regard to a particularly high efficiency to adapt the supply voltage of the strand voltage of the at least one LED strand.
  • the first and the second control circuit is designed to determine the actual values for mean value and peak value only for a first LED string, wherein an at least second LED string corresponding to the determined for the first LED string actual values is operated.
  • the first control loop may have a first comparator with which the actual value of the mean value of the current flowing through the at least one LED string is compared with a predefinable desired value, the output signal of the first comparator being coupled to the input of a second comparator, the second one of the comparators Entrance with a Triangulated signal is applied, wherein the output signal of the second comparator is coupled to the at least one switch.
  • the second control loop may comprise a third comparator with which the actual value of the peak value of the current flowing through the at least one LED string is compared with a predefinable desired value, the output signal of the third comparator being coupled to the first input of a fourth comparator whose second input is supplied with a triangular signal, wherein the output signal of the fourth comparator is coupled to a voltage converter.
  • the mean value of the current flowing through the at least one LED string can be changed by an operator.
  • the peak value of the current flowing through the at least one LED strand can be designed to be variable by an operator.
  • the second control circuit comprises a peak detector, for which the current flowing through at least one LED string, wherein a peak value for the current flowing through the at least one LED string can be predetermined and the second control circuit is designed to provide a supply voltage, such that the predetermined peak value is achieved.
  • the second control circuit comprises a DC / DC converter whose output voltage is coupled to the at least one supply terminal.
  • the DC / DC converter is designed in particular as a step-up converter, down converter or flyback converter.
  • an inductance is arranged serially to the output of the second control loop.
  • FIG. 3 shows a drive circuit according to the invention, wherein the circuit component in the right half of FIG. 3 substantially corresponds to the drive circuit shown in FIG.
  • the voltage U Sh dropped across the resistor R Sh is fed to a peak detector 18 whose output signal is correlated with the actual peak value î LED and is supplied to a comparator 20.
  • the comparator 20 At the other input of the comparator 20 is the adjustable peak value î LEDsoll .
  • One of the differences between î LEDsoll and î LED is corresponding voltage U Rege12 is supplied to a further comparator 22 whose other input is driven by a delta voltage U D2 .
  • the output signal of the comparator 22 is applied to 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.
  • an inductance L is serially arranged.
  • the T1-side terminal of the inductance L is connected via a capacitor C with Mass connected.
  • the voltage U A provided by the capacitor C is preferably chosen such that it is substantially equal to the phase voltage U St.
  • the oscillator frequency of the triangle generator 16 is preferably much smaller to choose from in view of a good controllability of the voltage U A as the oscillator frequency of the triangular generator 21.
  • the integrator 10 may be different than outlined, that is other than by an RC element , be realized.
  • the peak detector 18 may be realized 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)

Claims (12)

  1. Circuit de commande d'au moins une chaîne (D1 à D4) de DEL dans lequel il est monté en série avec chaque chaîne de DEL un commutateur (T1) et chaque chaîne de DEL a une borne d'alimentation par laquelle il peut lui être appliqué une tension d'alimentation, chaque commutateur (T1) pouvant être commandé de manière à rendre possible un flux de courant dans la chaîne associée de DEL, comprenant
    • un premier circuit de régulation conçu pour commander le commutateur (T1) de la au moins une chaîne de DEL de façon à obtenir une valeur (i̅ LEDsoll) moyenne réglable du courant (i LED) passant dans la chaîne de DEL ;
    • un deuxième circuit de régulation conçu pour mettre à disposition de la au moins une chaîne (D1 à D4) DEL une tension (UA) d'alimentation en fonction de la valeur (
    Figure imgb0001
    LED) de crête du courant (i LED) passant dans la au moins une chaîne LED,
    caractérisé
    en ce que le deuxième circuit de régulation a un détecteur (18) de valeur de crête pour le courant (i LED) passant dans la au moins une chaîne DEL, une valeur (
    Figure imgb0001
    LEDsoll) de crête du courant passant dans la au moins une chaîne DEL pouvant être prescrite et le deuxième circuit de régulation étant conçu pour mettre à disposition une tension (UA) d'alimentation de manière à obtenir la valeur (
    Figure imgb0001
    LEDsoll) de crête qui peut être prescrite.
  2. Circuit de commande suivant la revendication 1,
    caractérisé
    en ce que le deuxième circuit de régulation comprend un convertisseur CC/CC (21, 22, T2, D) dont la tension (UA) de sortie est appliquée à la au moins une borne d'alimentation.
  3. Circuit de commande suivant la revendication 2,
    caractérisé
    en ce que le convertisseur CC/CC (22, T2, D) est réalisé notamment en convertisseur élévateur, convertisseur abaisseur ou convertisseur à oscillateur bloqué.
  4. Circuit de commande suivant l'une des revendications précédentes,
    caractérisé
    en ce qu'une inductance (L) est montée en série avec la sortie du deuxième circuit de régulation.
  5. Circuit de commande suivant l'une des revendications précédentes,
    caractérisé
    en ce que la au moins une chaîne DEL fonctionne de manière cadencée.
  6. Circuit de commande suivant l'une des revendications précédentes,
    caractérisé
    en ce que la valeur (i̅ LED) moyenne du courant passant dans la au moins une chaîne DEL est réglée par une modulation en largeur d'impulsion.
  7. Circuit de commande suivant l'une des revendications précédentes,
    caractérisé
    en ce que le deuxième circuit de régulation est conçu pour adapter la tension (UA) d'alimentation à la tension (USt) de chaîne de la au moins une chaîne DEL.
  8. Circuit de commande suivant l'une des revendications précédentes,
    caractérisé
    en ce que le premier et le deuxième circuits de régulation sont conçus pour déterminer les valeurs réelles de la valeur (i̅ LEDist) moyenne et la valeur (
    Figure imgb0004
    ) de crête seulement pour une première chaîne DEL au moins une deuxième chaîne DEL fonctionnant en fonction des valeurs (i̅ LEDist,
    Figure imgb0004
    ) réelle déterminées pour la première chaîne DEL.
  9. Circuit de commande suivant l'une des revendications précédentes,
    caractérisé
    en ce que le premier circuit de régulation comprend un premier comparateur (12) par lequel la valeur (i̅ LEDist) réelle de la valeur moyenne du courant (i LED) passant dans la au moins une chaîne DEL est comparée à une valeur (i̅ LEDsoll) de consigne qui peut être prescrite, le signal (URegel) de sortie du premier comparateur (12) étant couplé à la première entrée d'un deuxième comparateur (14) dont la deuxième entrée est alimentée par un signal (UD) triangulaire, le signal de sortie du deuxième comparateur (14) étant envoyé au au moins un commutateur (T1) .
  10. Circuit de commande suivant l'une des revendications 3 à 10,
    caractérisé
    en ce que le deuxième circuit de régulation a un troisième comparateur (20) par lequel la valeur (
    Figure imgb0004
    ) réelle de la valeur de crête du courant (i LED) passant dans la au moins une chaîne DEL est comparée à une valeur (
    Figure imgb0007
    ) de consigne pouvant être prescrite, le signal de sortie du troisième comparateur (20) étant couplé à la première entrée d'un quatrième comparateur (22) dont la deuxième entrée est alimentée en un signal (UD2) triangulaire, le signal de sortie du quatrième comparateur (22) étant envoyé au convertisseur CC/CC.
  11. Circuit de commande suivant l'une des revendications précédentes,
    caractérisé
    en ce que la valeur (i̅ LEDsoll) moyenne du courant passant dans la au moins une chaîne DEL peut être modifiée par un opérateur à des fins d'obscurcissement.
  12. Circuit de commande suivant l'une des revendications précédentes,
    caractérisé
    en ce que la valeur (
    Figure imgb0007
    ) de crête du courant passant dans la au moins une chaîne DEL peut être modifiée par un opérateur à des fins de réglages des longueurs d'ondes de la lumière émise par la chaîne DEL.
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 EP1372359A1 (fr) 2003-12-17
EP1372359B1 true EP1372359B1 (fr) 2007-02-21

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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)

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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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Publication number Priority date Publication date Assignee Title
CN103889107A (zh) * 2012-12-21 2014-06-25 欧司朗有限公司 运行n个具有至少一个半导体光源的并联支路的电路装置
CN103889107B (zh) * 2012-12-21 2018-05-18 欧司朗有限公司 运行n个具有至少一个半导体光源的并联支路的电路装置
DE102022200429A1 (de) 2022-01-17 2023-07-20 Osram Gmbh Zweistufiges betriebsgerät mit isolierbarem getakteten konverter als leistungsfaktorkorrektor und regelungsverfahren für das betriebsgerät
WO2023134892A1 (fr) 2022-01-17 2023-07-20 Osram Gmbh Dispositif de fonctionnement à deux étages doté d'un convertisseur cadencé pouvant être isolé comme correcteur de facteur de puissance et procédé de commande pour le dispositif de fonctionnement

Also Published As

Publication number Publication date
CN1469694A (zh) 2004-01-21
US7061394B2 (en) 2006-06-13
US20030227265A1 (en) 2003-12-11
CA2431514A1 (fr) 2003-12-10
ATE354930T1 (de) 2007-03-15
CN100469208C (zh) 2009-03-11
DE10225670A1 (de) 2003-12-24
DE50306558D1 (de) 2007-04-05
EP1372359A1 (fr) 2003-12-17

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