EP3518625A1 - 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
EP3518625A1
EP3518625A1 EP19153652.3A EP19153652A EP3518625A1 EP 3518625 A1 EP3518625 A1 EP 3518625A1 EP 19153652 A EP19153652 A EP 19153652A EP 3518625 A1 EP3518625 A1 EP 3518625A1
Authority
EP
European Patent Office
Prior art keywords
current
driver circuit
leds
resistor
values
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
EP19153652.3A
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German (de)
English (en)
Other versions
EP3518625B1 (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
Original Assignee
Siteco Beleuchtungstechnik GmbH
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Publication date
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Publication of EP3518625A1 publication Critical patent/EP3518625A1/fr
Application granted granted Critical
Publication of EP3518625B1 publication Critical patent/EP3518625B1/fr
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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 powering one or more LEDs, in particular a driver circuit, which comprises a control to a current value to achieve a desired dimming of the LEDs.
  • An LED is any semiconductor light source to understand, including organic semiconductor light sources, so-called OLEDs to count.
  • the driver circuit of the type mentioned above are typically realized in two different variants.
  • On the one hand there is a pulse width modulation control in which LED current with pulse width modulated signal on and off.
  • On the other hand there is an analogous method in which the current can be regulated without interruption to a desired value.
  • the pulse width modulation method is not considered to be preferred for general lighting, as it may lead to stroboscopic effects, in particular interference of cameras or interference of barcode scanners. In addition, health effects are feared by the stroboscopic effect.
  • FIG. 1 A typical prior art circuit is in FIG. 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. By measuring resistor R CS flows in the on state, the same current flowing through the LED load. The voltage drop across R CS is in the integrated circuit measured and used to control a desired amperage for the LED load in the integrated circuit.
  • a disadvantage of this type of analog current control is that at low current values, the voltage drop across the measuring resistor can be very small. By currents inevitably occurring in the circuit, e.g. resulting from switching transistors, therefore, at low current values, the evaluation of the voltage drop across the current measuring resistor for the control of the current is unusable. Thus, in such an analog current control results in a minimum lower value up to which the current control can be done reliably. One way to get to 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 high currents leads to large losses and even thermal problems can occur.
  • the object of the present invention is therefore to provide a driver circuit for powering LEDs, which covers the widest possible current range for achieving a large dimming range and avoids the disadvantages of pulse width modulation.
  • the object is achieved by a driver circuit for the power supply of one or more LEDs according to claim 1.
  • a special feature of the driver circuit of the present invention is that the current measuring resistor is switched to at least two different values, the lower of the two values for measuring the current through the LEDs in a lower current range and the higher of the two values for measuring the current through the LEDs is applied in a higher current range.
  • the current measuring resistor is adapted to the particular current range to be measured, so that the voltage drop across the current measuring resistor assumes an acceptable value, which can be easily processed by the driver circuit. This makes it possible to measure even small currents.
  • the power converted at the current measuring resistor is limited because a lower measuring resistor is selected in the higher current range. This limits the power loss and the resulting thermal problems.
  • the measuring resistor is formed by at least two resistors connected in parallel, of which at least one of the two resistors can be electronically connected or disconnected.
  • the two resistors which together form the current measuring resistor, connected in parallel to each other in the circuit of the LEDs to earth, wherein in one of the two parallel branches, an electronic switch is provided which can be opened or closed.
  • the current measuring resistor is formed either only by one of the two resistors (when the switch is open) or by both resistors connected in parallel (when the switch is closed).
  • two different values for the current measuring resistor can be realized.
  • It can also be provided in parallel more than two resistors.
  • more than just an electronic switch can be provided. It can also be connected in series with each of the resistors connected in parallel with an electronic switch, in which case at least one of the switches is closed during operation of the LED.
  • the electronic connection and disconnection of the at least one resistor by driving a gate of a field effect transistor, FET whose source and drain is connected in series with the resistor.
  • a FET has a very low resistance in the closed state between source and drain, so that 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 a 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 easier to set up and can also be fully realized 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 when the current to be measured reaches the limit of the two current ranges, it switches the driver circuit reverses the current sensing resistor to correspondingly decrease or increase the voltage drop across the current sensing resistor.
  • the two current ranges may also partially overlap. This prevents frequent switching operations between the current sense resistors if the current to be measured by the LEDs happens to oscillate exactly in the area between the two current ranges. For example, when the maximum of the lower current range is reached, the measuring resistor can be switched over to the lower value and, conversely, switched to the higher value only when the minimum of the higher current range has been reached. This type of hysteresis prevents frequent switching operations from occurring at low current fluctuations around the border between the current ranges, which could manifest as LED flickering.
  • the current measuring resistor may assume at least two values, the lower value between 0.1 ohms and 0.5 ohms and the higher of the two values between 0.9 ohms and 1.7 ohms.
  • the power loss can be limited to a maximum of 0.5 W.
  • the lower current range may include 20 mA to 200 mA and the higher current range may comprise 200 mA to 1 A. It may also be provided that the current ranges also overlap, as previously described, such that, for example, the lower current range comprises a maximum value of 250 mA, while the higher current range comprises a minimum value of 150 mA.
  • the current measuring resistor can also be more than just two values, e.g. three or four values, for three or four current ranges.
  • FIG. 2 An embodiment of a driving circuit for LEDs according to the present invention is shown in FIG FIG. 2 shown. Similar to a driver circuit of the prior art, which in FIG. 1 is shown, an LED load 3, which may be formed by one or more LEDs (only one LED shown in the figures) via a supply voltage which is provided by an integrated circuit 2, driven.
  • the integrated circuit 2 provides a constant current supply through the LED load 3. A constant current can be adjusted (not shown in the figure) 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 provided.
  • a second resistor R CS 2 is provided which is connected in parallel with the first resistor R CS and is also connected to ground via a semiconductor switch, eg a field effect transistor 22.
  • a semiconductor switch eg a field effect transistor 22.
  • the field effect transistor 22 is turned on, that is, a conductive connection between drain and source, the resistor R CS 2 is parallel to the resistor R CS , so that the current sense resistor for the integrated circuit 2 is given in total by the parallel connection of R CS and R CS 2 is.
  • the gate of the field effect transistor 22 is applied to an output of a microcontroller 24 and is controlled by this. Further, the microcontroller 24 provides a control voltage which acts on an input LD of the integrated circuit 2 to adjust the supply current through the LED.
  • the microcontroller 24 also serves 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 applied to the input LD of the integrated circuit 2, taking into account the current measuring resistor selected via the range changeover by the microcontroller 24.
  • the integrated circuit 2 sets the current through the LED load.
  • any current can be set between 20 mA and 1 A, for example.
  • the microcontroller applies a voltage to the gate of the semiconductor switch provided by the FET 22, so that a drain-to-source connection is turned on.
  • the resistors R CS and R CS 2 are connected in parallel to ground.
  • the parallel circuit of R CS and R CS 2 acts in this circuit state as a measuring resistor for the current control of the LED load.
  • the integrated circuit 2 measures the voltage drop across the parallel connection of the resistors R CS and R CS 2 to control the current through the LEDs to a constant value.
  • the field effect transistor 22 is triggered 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 of the measuring resistor for determining the current is given only by the resistor R CS .
  • the current measuring resistor is switched over the microcontroller 24 according to a predetermined current range between two values.
  • the lower current range of the measuring resistor is given only by R CS
  • 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 effectively only a current measuring resistor of 0.6 ohms is given.
  • the power converted at the measuring resistor power is reduced at higher currents.
  • the electricity is higher Measuring range, the voltage drop is still sufficiently high to allow precise current measurement.
  • the lower current measuring range of the measuring resistance is increased accordingly, for example to 1.2 ohms, so that even at the lower to be measured supply currents still a sufficiently high voltage drop is given for the measuring resistor.
  • a control voltage is also output, which acts on the integrated circuit 12, to compensate for the current measurement correspond to the selected measuring resistor by the corresponding factor.
  • the present invention is not limited to the illustrated circuit of two resistors R CS and R CS 2. It is also possible to connect more than two resistors in parallel, and it is also possible to provide more than just two current ranges for measuring the current.
  • the remaining circuit for LED power supply corresponds to the embodiment in the prior art.
  • the inventive range switching for the measuring resistor can also be implemented simply with existing integrated circuits known from the prior art for an LED power supply.
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 true EP3518625A1 (fr) 2019-07-31
EP3518625B1 EP3518625B1 (fr) 2022-09-07

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EP19153652.3A Active EP3518625B1 (fr) 2018-01-26 2019-01-25 Circuit d'attaque destiné à l alimentation électrique d'une pluralité de del

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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10013215A1 (de) * 2000-03-17 2001-09-20 Tridonic Bauelemente Ansteuerschaltung für Leuchtdioden
EP2512207A1 (fr) * 2011-04-15 2012-10-17 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
US20150245441A1 (en) * 2014-02-25 2015-08-27 Earl W. McCune, Jr. High-Efficiency, Wide Dynamic Range Dimming for Solid-State Lighting
US20150305103A1 (en) * 2012-11-05 2015-10-22 Osram Sylvania Inc. Driver for solid state light sources

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140241387A1 (en) * 2013-02-22 2014-08-28 Raytheon Company Multiple-current-source laser diode driver system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10013215A1 (de) * 2000-03-17 2001-09-20 Tridonic Bauelemente Ansteuerschaltung für Leuchtdioden
EP2512207A1 (fr) * 2011-04-15 2012-10-17 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
US20150305103A1 (en) * 2012-11-05 2015-10-22 Osram Sylvania Inc. Driver for solid state light sources
US20150245441A1 (en) * 2014-02-25 2015-08-27 Earl W. McCune, Jr. High-Efficiency, Wide Dynamic Range Dimming for Solid-State Lighting

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
C. WESLEY TIPTON ET AL: "Multi-Channel, Constant-Current Power Source for Aircraft Applications", 16 January 2018 (2018-01-16), pages 1 - 3, XP055581932, Retrieved from the Internet <URL:https://apps.dtic.mil/dtic/tr/fulltext/u2/1042222.pdf> [retrieved on 20190417] *
UNKNOWN: "HV9961 LED Driver with Average-Current Mode Constant-Current Control", MICROCHIP TECHNOLOGY INC, 1 January 2017 (2017-01-01), pages 1 - 16, XP055581937, Retrieved from the Internet <URL:http://ww1.microchip.com/downloads/en/devicedoc/20005588a.pdf> [retrieved on 20190417] *

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EP3518625B1 (fr) 2022-09-07
DE102018101796A1 (de) 2019-08-01

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