EP3518625B1 - Circuit d'attaque destiné à l alimentation électrique d'une pluralité de del - Google Patents

Circuit d'attaque destiné à l alimentation électrique d'une pluralité de del Download PDF

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Publication number
EP3518625B1
EP3518625B1 EP19153652.3A EP19153652A EP3518625B1 EP 3518625 B1 EP3518625 B1 EP 3518625B1 EP 19153652 A EP19153652 A EP 19153652A EP 3518625 B1 EP3518625 B1 EP 3518625B1
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EP
European Patent Office
Prior art keywords
current
driver circuit
rcs2
leds
rcs
Prior art date
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Active
Application number
EP19153652.3A
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German (de)
English (en)
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EP3518625A1 (fr
Inventor
Christoph Hofinger
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.)
Siteco GmbH
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Siteco GmbH
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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]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • 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]
    • H05B45/30—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
    • H05B45/395—Linear regulators
    • 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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/59—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits for reducing or suppressing flicker or glow effects

Definitions

  • the invention relates to a driver circuit for the power supply of one or more LEDs, in particular a driver circuit that includes regulation to a current value in order to achieve a desired dimming of the LEDs.
  • An LED is understood to mean any semiconductor light source, which also includes organic semiconductor light sources, so-called OLEDs.
  • the driver circuit of the type mentioned at the outset is typically implemented in two different variants.
  • On the one hand there is a pulse width modulation control in which the LED current is switched on and off with a pulse width modulated signal.
  • On the other hand there is an analog method in which the current can be regulated to a desired value without interruption.
  • the pulse width modulation method is not considered to be preferred for general lighting, as it can lead to stroboscopic effects, in particular interference from cameras or interference from barcode scanners. In addition, health effects due to the stroboscopic effect are also feared.
  • a typical prior art circuit is shown in figure 1 shown.
  • An LED load which may include one or more LEDs, is controlled by an integrated circuit.
  • the integrated circuit has an input CS to which a measuring resistor R CS is connected to ground.
  • the same current that flows through the LED load flows through the measuring resistor R CS when it is switched on.
  • the voltage drop across RCS is in the integrated circuit measured and used to regulate a desired current level for the LED load in the integrated circuit.
  • a disadvantage of this type of analog current control is that the voltage drop across the measuring resistor can be very small with small current values. Due to currents that inevitably arise in the circuit, e.g. from switching transistors, the evaluation of the voltage drop across the current measuring resistor for the regulation of the current becomes useless with small current values. With such an analog current regulation, there is thus a minimum lower value up to which the current regulation can take place reliably. One way to get even smaller current values would be to increase the value of the current sense resistor. However, this has the consequence that the power loss at the resistor at higher currents leads to large losses and even thermal problems can occur.
  • U.S. 2015/305103 A1 , WO 2013/028632 A1 , U.S. 2015/245441 A1 , EP 2 512 207 A1 and DE 100 13 215 A1 disclose further driver circuits for driving LEDs, which have a controllable resistor in the supply circuit of the LEDs.
  • the data sheet "HV9961 LED Driver with Average-Current Mode Constant-Current Control” discloses a driver circuit according to figure 1 .
  • the object of the present invention is therefore to provide a driver circuit for the power supply of LEDs, which covers the widest possible current range to achieve a large dimming range and thereby avoids the disadvantages of pulse width modulation.
  • the object is achieved by a driver circuit for powering one or more LEDs according to claim 1.
  • a special feature of the driver circuit of the present invention is that the current sense resistor is switched to at least two different values, the lower of the two values being used to measure the current through the LEDs in a lower current range and the higher of the two values being used to measure the current through the LEDs in a higher current range is applied.
  • the current measuring resistor is adapted to the current range to be measured in each case, so that the voltage drop across the current measuring resistor assumes an acceptable value, which can be easily processed by the driver circuit. This means that even small currents can be measured.
  • the power converted at the current measuring resistor is limited because a lower measuring resistor is selected in the higher current range. This will make the Power loss and the resulting thermal problems are limited.
  • the measuring resistor is formed by at least two resistors connected in parallel, of which at least one of the two resistors can be switched on or off electronically.
  • the two resistors, which together form the current measuring resistor are connected in parallel to ground in the circuit of the LEDs, with an electronic switch being provided in one of the two parallel branches, which can be opened or closed.
  • the current measuring resistor is formed either by just one of the two resistors (when the switch is open) or by both resistors connected in parallel (when the switch is closed).
  • resistors can also be provided in parallel.
  • electronic switch can also be provided.
  • Each of the resistors connected in parallel can also be connected in series with an electronic switch, in which case at least one of the switches is closed during operation of the LED.
  • the at least one resistor is switched on and off electronically by driving a gate of a field effect transistor, FET, whose source and drain are connected in series with the resistor.
  • FET field effect transistor
  • a FET has a very low resistance between the source and drain in the closed state, so the resistance of the field effect transistor itself is negligible.
  • the internal resistance of the FET is largely thermally stable, so that Measurement errors are minimized by a changing internal resistance of the FED.
  • the FET can be controlled with the microcontroller.
  • the microcontroller only has to generate a voltage which is to be applied to the gate in order to open or close the FET between source and drain.
  • a circuit is simpler to construct and can also be implemented entirely as an integrated circuit.
  • the maximum of the lower current range corresponds to the minimum of the higher of the two current ranges.
  • the driver circuit switches over the current measuring resistor in order to correspondingly reduce or increase the voltage drop across the current measuring resistor.
  • the two current ranges overlap. This prevents frequent switching operations between the current measuring resistors if the current to be measured through the LEDs happens to fluctuate exactly in the range between the two current ranges.
  • the measuring resistor is switched over to the lower value when the maximum of the lower current range is reached and, conversely, only switched back to the higher value when the minimum of the higher current range is reached. This type of hysteresis prevents frequent switching operations from occurring with small current fluctuations around the boundary between the current ranges, which could result in flickering of the LED.
  • the current measuring resistor can assume at least two values, the lower value being between 0.1 ohms and 0.5 ohms and the higher of the two values being between 0.9 ohms and 1.7 ohms.
  • the power dissipation can be limited to a maximum of 0.5 W.
  • the lower current range can be 20 mA to 200 mA and the higher current range can be 200 mA to 1 A.
  • the current ranges overlap, as described above, so that, for example, the lower current range has a maximum value of 250 mA, while the higher current range has a minimum value of 150 mA.
  • the current measuring resistor can also assume more than just two values, for example three or four values, for three or four current ranges.
  • FIG. 2 An embodiment of a driver circuit for LEDs according to the present invention is in figure 2 shown. Similar to a prior art driver circuit disclosed in figure 1 is shown, an LED load 3, which can be formed by one or more LEDs (only one LED is shown in the figures) is driven via a supply voltage that is provided by an integrated circuit 2.
  • the integrated circuit 2 provides a constant current supply through the LED load 3. A constant current can be set (not shown in the figure) in order to produce a desired dimming of the LED load.
  • the LED load can be switched on and off by the integrated circuit.
  • a field effect transistor 4 is connected to an output GATE of the integrated circuit 2, which connects the LED load 3 to ground when it is closed.
  • a resistor R CS is included in this circuit.
  • the voltage drop across the resistor R CS is measured at an input CS of the integrated circuit 2 and is used to control the constant current through the LED. So far, the circuit according to the present invention is also the same as that in FIG figure 1 shown circuit according to the prior art.
  • a second resistor R CS 2 is additionally provided, which is connected in parallel to the first resistor R CS and is also connected to ground via a semiconductor switch, for example a field effect transistor 22 . If the field effect transistor 22 is switched on, ie there is a conductive connection between drain and source, the resistor R CS 2 is in parallel with the resistor R CS , so that the current measuring resistor for the integrated circuit 2 is given overall by the parallel connection of R CS and R CS 2 is.
  • the gate of the field effect transistor 22 is connected to an output of a microcontroller 24 and is controlled by it. Furthermore, the microcontroller 24 provides a control voltage which acts on an input LD of the integrated circuit 2 in order to set the supply current through the LED.
  • the microcontroller 24 is also used to set the current for the desired dimming of the LED load.
  • the microcontroller 24 generates a control voltage corresponding to the desired dimming, which is present at the input LD of the integrated circuit 2, the current measuring resistor selected by the microcontroller 24 via the range switchover being taken into account.
  • the integrated circuit 2 sets the current through the LED load. Any current can be set between 20 mA and 1 A, for example, to dim the LED.
  • the microcontroller applies a voltage to the gate of the semiconductor switch, which is given by the FET 22, so that a connection from drain to source is switched through.
  • the resistors R CS and R CS 2 are connected in parallel to ground.
  • the parallel connection of R CS and R CS 2 acts as a measuring resistor for the current regulation of the LED load.
  • the integrated circuit 2 measures the voltage drop across the parallel combination of resistors RCS and RCS 2 to regulate the current through the LEDs to a constant value.
  • the field effect transistor 22 is controlled via the microcontroller 24 in order to open the connection between drain and source.
  • the supply current flows through the LED load 3 only through the resistor R CS , so that in this circuit state the measuring resistor for determining the current is given only through the resistor R CS .
  • the current measuring resistor is thus switched over between two values via the microcontroller 24 in accordance with a predetermined current range.
  • the measuring resistance is given only by RCS
  • the measuring resistance is given by the parallel connection of RCS and RCS 2 is correspondingly lower.
  • the resistance R CS and R CS 2 can each be 1.2 ohms, so that in the higher current range from 200 mA to 1 ⁇ A there is effectively only a current measuring resistor of 0.6 ohms.
  • the power converted at the measuring resistor is reduced for larger currents.
  • the measuring resistor is correspondingly increased, for example to 1.2 ohms, so that even with the lower supply currents to be measured, there is still a sufficiently high voltage drop for the measuring resistor.
  • a control voltage is output via the microcontroller 24, which acts on the integrated circuit 12 in order to compensate the current measurement corresponding to the selected measuring resistor by the appropriate factor.
  • the present invention is not limited to the illustrated circuit of two resistors R CS and R CS 2 . More than two resistors can also be connected in parallel and more than just two current ranges can also be provided for measuring the current.
  • the rest of the LED power supply circuitry is the same as the prior art embodiment.
  • the range switching according to the invention for the measuring resistor can also be easily implemented using existing integrated circuits known from the prior art for an LED power supply.

Landscapes

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

Claims (6)

  1. Circuit d'attaque destiné à l'alimentation électrique d'une ou de plusieurs DEL (3), comprenant une source de courant constant réglable destinée à la connexion d'une ou de plusieurs DEL (3) montées en série, et
    une résistance de mesure de courant (RCS, RCS2) commutable qui est montée de façon commutable en série avec la ou les plusieurs DEL,
    le circuit d'attaque étant agencé pour, par le biais d'une chute de tension de la résistance de mesure de courant (RCS, RCS2), mesurer le courant traversant la ou les plusieurs DEL (3) afin de régler le courant à une valeur prédéfinie, la commutation de la résistance de mesure de courant (RCS, RCS2) étant commandée par un microcontrôleur (24) du circuit d'attaque, et le microcontrôleur fournissant en outre une tension de commande qui fixe la production de courant au niveau de la source de courant constant en fonction de la résistance de mesure de courant (RCS, RCS2) sélectionnée,
    le circuit d'attaque étant en outre agencé pour commuter la résistance de mesure de courant (RCS, RCS2) sur au moins deux valeurs différentes, la commutation se faisant dans une plage de courant plus élevée sur la plus faible des deux valeurs pour la mesure du courant traversant la ou les plusieurs DEL (3), et dans une plage de courant plus faible sur la plus élevée des deux valeurs pour une mesure du courant traversant la ou les plusieurs DEL (3),
    caractérisé en ce que les deux plages de courant se chevauchent partiellement, et en ce que le circuit d'attaque est agencé de façon à commuter sur la valeur faible la résistance de mesure de courant (RCS, RCS2) lorsque le maximum de la plage de courant inférieure est atteint et de façon à, inversement, ne la commuter de nouveau sur la valeur plus élevée que lorsque le minium de la plage de courant plus élevée est atteinte.
  2. Circuit d'attaque selon la revendication 1, la résistance de mesure de courant (RCS, RCS2) étant formée d'au moins deux résistances (RCS, RCS2) montées en parallèle, dont au moins une (RCS2) peut être mise en circuit et hors circuit électroniquement.
  3. Circuit d'attaque selon la revendication 2, la mise en circuit et hors circuit électronique de l'au moins une résistance (RCS2) s'effectuant par une activation d'une grille (G) d'un transistor à effet de champ FET (22) dont la source (S) et le drain (D) sont montés en série avec la résistance.
  4. Circuit d'attaque selon la revendication 3, la grille (G) du FET (22) étant activée par le microcontrôleur (24).
  5. Circuit d'attaque selon l'une des revendications précédentes, la résistance de mesure de courant pouvant adopter au moins deux valeurs, la valeur plus faible étant comprise entre 0,1 ohm et 0,7 ohm, et la valeur plus élevée étant comprise entre 0,9 ohm et 1,7 ohm.
  6. Circuit d'attaque selon l'une des revendications précédentes, la résistance de mesure de courant adoptant plus de deux valeurs, en particulier trois ou quatre valeurs pour commuter entre plus de deux plages de courant, en particulier trois ou quatre plages de courant.
EP19153652.3A 2018-01-26 2019-01-25 Circuit d'attaque destiné à l alimentation électrique d'une pluralité de del Active EP3518625B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018101796.0A DE102018101796A1 (de) 2018-01-26 2018-01-26 Treiberschaltung zur Stromversorgung einer oder mehrerer LEDs

Publications (2)

Publication Number Publication Date
EP3518625A1 EP3518625A1 (fr) 2019-07-31
EP3518625B1 true EP3518625B1 (fr) 2022-09-07

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EP (1) EP3518625B1 (fr)
DE (1) DE102018101796A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10013215B4 (de) * 2000-03-17 2010-07-29 Tridonicatco Gmbh & Co. Kg Ansteuerschaltung für Leuchtdioden
EP2512207B1 (fr) * 2011-04-15 2013-06-05 ATLAS Elektronik GmbH Circuit d'excitation et procédé d'alimentation d'une DEL ainsi que moyen d'éclairage
WO2013028632A1 (fr) * 2011-08-19 2013-02-28 Marvell Semiconductor, Inc. Régulateur pour le mélange de couleur d'éclairage à led
EP2914715A1 (fr) * 2012-11-05 2015-09-09 Osram Sylvania Inc. Commande pour sources de lumière à semi-conducteurs
US20140241387A1 (en) * 2013-02-22 2014-08-28 Raytheon Company Multiple-current-source laser diode driver system
US9456481B2 (en) * 2014-02-25 2016-09-27 Earl W. McCune, Jr. High-efficiency, wide dynamic range dimming for solid-state lighting

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EP3518625A1 (fr) 2019-07-31
DE102018101796A1 (de) 2019-08-01

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