EP2428098A2 - Dispositif pour faire fonctionner des del - Google Patents

Dispositif pour faire fonctionner des del

Info

Publication number
EP2428098A2
EP2428098A2 EP10719578A EP10719578A EP2428098A2 EP 2428098 A2 EP2428098 A2 EP 2428098A2 EP 10719578 A EP10719578 A EP 10719578A EP 10719578 A EP10719578 A EP 10719578A EP 2428098 A2 EP2428098 A2 EP 2428098A2
Authority
EP
European Patent Office
Prior art keywords
led
led2
operating
measurement
leds
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
EP10719578A
Other languages
German (de)
English (en)
Other versions
EP2428098B1 (fr
Inventor
Horst Knoedgen
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.)
Tridonic GmbH and Co KG
Original Assignee
Tridonic GmbH and Co KG
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 Tridonic GmbH and Co KG filed Critical Tridonic GmbH and Co KG
Publication of EP2428098A2 publication Critical patent/EP2428098A2/fr
Application granted granted Critical
Publication of EP2428098B1 publication Critical patent/EP2428098B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • H05B45/12—Controlling the intensity of the light using optical feedback

Definitions

  • the invention relates to a device for operating LEDs according to the preamble of patent claim 1 and a method for operating LEDs according to the preamble of patent claim 19.
  • Such devices are used in lighting systems to achieve a colored or flat lighting of rooms, paths or escape routes. Usually, the bulbs are driven by operating devices and activated as needed. For such illumination, organic or inorganic light emitting diodes (LED) are used as the light source.
  • LED organic or inorganic light emitting diodes
  • light-emitting diodes are also increasingly being used as the light source.
  • the efficiency and luminous efficacy of light-emitting diodes is being increased more and more so that they are already being used in various general lighting applications.
  • the solution according to the invention for a device for operating LEDs is based on the idea that it has a driver module and an LED module controlled by the driver module with at least two LEDs.
  • the driver module includes a switching regulator, wherein at least in one operating mode, a first LED is driven so that it lights, and the second LED is used in a reverse mode as a photodiode and receives at least a portion of the light of the first LED, and a measurement the second LED is used, the measurement on the second LED for determining an operating parameter of the LED module is used and this measurement takes place on the second LED, while the second LED is bridged.
  • the invention also makes possible a method for operating LEDs, wherein at least in one operating mode a first LED is activated so that it lights up, a second LED is used in a reverse mode as a photodiode and receives at least a part of the light of the first LED, and Measurement on the second LED is used to determine an operating parameter of the LED module.
  • FIG. 1 shows a device according to the invention for operating LED.
  • FIG. 2 shows an embodiment of a device according to the invention.
  • FIG. 3 shows a further embodiment of a device according to the invention.
  • FIG. 4 shows a possibility for calibrating a device according to the invention
  • Fig. 1 shows an inventive device for operating LED in an abstracted representation.
  • This device has a driver module 1, and an LED module 5 controlled by the driver module 1 with at least two LEDs (LED1, LED2).
  • the LED (LED1, LED2) of the LED module 5 can be selectively controlled via the various drive channels (via the wiring 4).
  • This device preferably has a memory for storing information about the LED module 5, wherein the memory can be contained either in the driver module 1 or in the LED module 5 and optionally the information in the memory can be changed.
  • the memory is preferably designed to be non-volatile, i. that it is maintained even when switching off or failure of the supply voltage.
  • a flash memory can be used.
  • the memory may be included in a driver module 1.
  • the driver module 1 has connections 2 and 3 to which two or more LEDs (LED1, LED2) are connected via the wiring 4 to a (preferably common) LED module 5.
  • the LED module 5 may be, for example, a circuit board or a base support on which two or more LEDs (LED1, LED2) are arranged.
  • the LEDs can be embodied, for example, as a wired LED, as an SMD LED or as a COB LED (chip-on-board LED).
  • the LED module 5 can also have means for heat removal or cooling.
  • the LEDs can also be selectively controlled via individually controllable channels (via the wiring 4).
  • the individually controllable LED can be selectively controlled on an LED module 5 (for example, turned on, turned off and changed in their brightness).
  • An LED module 5 can have different LEDs (LED1, LED2), wherein these can preferably be controlled independently of each other (selectively) via individual channels. These different LEDs may differ, for example, in their wavelength, color location and / or intensity.
  • LED1, LED2 At least in one operating mode of the LED module 5 by the driver module 1, a first LED is driven so that it lights up.
  • the second LED LED2 is used in a reverse mode as a photodiode and can receive at least a portion of the light of the first LED LED1. In this case, a measurement takes place on the second LED LED2, the measurement on the second LED serving to determine an operating parameter of the LED module (ie, for example, the first LED LED1 or the second LED LED2) the second LED LED2 is bridged.
  • the measurement on the second LED LED2 can be used to determine the temperature of the LED module or the temperature of the first LED1 or the second LED LED2.
  • the measurement on the second LED LED2 can also be used to monitor the aging of the LED module or the first LED1 or the second LED LED2.
  • the measurement can be made on the basis of the leakage current of the second LED LED2.
  • the measurement can be made on the basis of a measurement of the differential resistance of the second LED LED2.
  • the second LED LED2 can be controlled as an LED in a different operating state from the reverse mode, to light up and contribute to light generation. This is preferably always done when no measurement is performed (at the second LED LED2) to determine an operating parameter of the LED module, but the LED module is operated (or at least the other LEDs of the same color as the second LED LED2 are driven) ,
  • the two LEDs can be optically coupled.
  • the optical coupling OK can take place via a light guide, which preferably connects the first LED LED1 to the second LED LED2. For example, part of the light from the first LED can be coupled out into the light guide.
  • the optical coupling can be done via a partial reflection or total reflection within the LED module or within the lamp surrounding the LED module.
  • the second LED LED2 may be placed so that it can receive a part of the light emitted by the LED modules.
  • the second LED LED2 may be placed so that it is isolated from ambient light and can only receive light emitted by the LED modules (total reflection). This partitioning can be done by a cover, which is specially mounted for the measurement with the second LED LED2 for determining an operating parameter of the LED module. This cover may contain the second LED LED2. The second LED LED2 can also be placed on the reflector of the first LED LED1.
  • the second LED may be placed LED2 so as to directly or indirectly receive the light of the first LED LED1 of the LED module.
  • the luminaire surrounding the LED module can also be constructed such that part of the light of the first LED LED1 is reflected and can be received by the second LED LED2 (partial reflection).
  • the measurement at the second LED LED2 to determine a Bracket 'arameters can be repeated at regular intervals or be initiated by a control command.
  • driver modules for LED operate at frequencies above 200 Hz (in the range up to several hundred kHz), so that a sufficiently short measurement is possible.
  • the measurement on the second LED LED2 for determining an operating parameter can also take place during a switch-off phase of the LED module, in particular the measurement can be made on the second LED LED2 while it is switched off, preferably bypassed.
  • the second LED LED2 may be optically coupled to another LED of the LED module.
  • the measurement on the second LED LED2 to determine an operating parameter for the first LED LED1 and the other LED can be done by sequential activation of the individual LED or at the same time for the entire LED module or subregions (groups of LED).
  • the device may have a memory for storing the operating parameter.
  • the memory can be read out via a digital interface.
  • the memory may be located on the driver module and read by the user when the LED module is replaced.
  • the memory can be located on the LED module 5 and be read when replacing the LED module 5 by the user. When the memory is on the LED module 5, the memory may be read out before the replacement of the LED module 5 by the driver module 1 due to a user signaling.
  • the memory can also be arranged in a calibration device or on the driver module 1.
  • Information about the type of LED, the wavelength, the color location and / or the intensity of the LED can be stored in the memory. Furthermore, other operating parameters such as the required setpoint operating current through the LED or the maximum permissible current through the LED or also the maximum permissible voltage through the LED can be stored as information in the memory.
  • the signaling for reading the memory on the LED module 5 can be done by the user by a switching sequence on the supply voltage, a digital control command or by other signaling.
  • the driver module 1 can forward the information stored in the memory via a (preferably digital) interface 7 to other driver modules.
  • the invention also makes possible a method for operating LEDs, wherein at least in one operating mode a first LED is activated so that it lights up, a second LED is used in a reverse mode as a photodiode and receives at least part of the light of the first LED, and Measurement on the second LED is used to determine an operating parameter of the LED module.
  • the driver module 1 may include a switching regulator, for example an AC-DC converter or DC-DC converter.
  • the driver module 1 can be connected to a supply voltage 8 (for example, an AC mains voltage or a DC voltage).
  • the driver module 1 may include a PFC (active or passive power factor correction circuit).
  • the PFC can be formed for example by a boost converter, buck-boost converter, a flyback converter or by a Valley FiII circuit.
  • the driver module 1 may have a potential separation. This isolation can be done for example via a transformer.
  • the driver module 1 may, for example, a buck converter (Buck converter) include a flyback converter (isolated flyback converter), a forward converter (Durchflußwandler) or a half-bridge converter with transformer.
  • a buck converter Buck converter
  • flyback converter isolated flyback converter
  • forward converter Durchflußwandler
  • the driver module 1 has a PFC, it can be implemented as a so-called single-stage topology, for example by a flyback converter operating in the so-called borderline mode or else by a so-called two-stage topology, for example by a boost converter with a subsequent half-bridge topology. Converter with transformer, be executed.
  • the driver module 1 may have means for controlling the current through one or more LED of the LED module 5, the voltage across the LED of the LED module 5, or power supplied to the LED of the LED module 5.
  • the detection of the current by one or more LEDs of the LED module 5 and / or the voltage across the LED of the LED module 5 can be achieved by means of resistors or by means of other sensor means such as a current or
  • the driver module 1 may also have a current source characteristic and be operated such that a predetermined current is impressed at a certain drive frequency and / or An Kunststoffeinschaltwort.
  • the operation of the LEDs can be such that the LED module 5 with at least two LEDs (LED1, LED2) is driven by a driver module, and a memory for storing information about the LED module 5 is present, with information in the Memory can be stored or modified. The information in the memory can be changed based on a calibration measurement.
  • a calibration measurement can be carried out with the aid of a temperature sensor.
  • both a measurement with the second LED LED2 used as the photodiode and with the temperature sensor can be carried out when the first LED LED1 is operated.
  • the measurement result of the measurement can be compared with the second LED LED2.
  • reference values preferably in a table
  • the information in the memory can be changed by a correction factor.
  • the information in memory may be modified by a correction factor determined based on a calibration measurement.
  • the correction factor may be selected depending on the temperature measured by the invention.
  • the correction factor can also. be changed due to a calibration measurement.
  • the correction factor can also be changed by a user, for example via a specification via an interface 7.
  • the interface 7 can use both a wired and a wireless transmission.
  • the change of the correction factor for example by a user, can, as already mentioned, also take place on the basis of a calibration measurement.
  • This calibration measurement can be done by a measurement with a sensor 6 (as described later with reference to FIG. 4) or else only via the visual sensation of the user.
  • the correction factor may be dependent on the aging or the operating time of the LED module 5.
  • Fig. 2 is given as a example of a switching regulator as driver module 1, a buck converter.
  • the buck converter as driver module 1 is designed for the operation of at least two LED (LED1, LED2) and has a switch S1.
  • switch S1 a field effect transistor is preferably used.
  • the switch S1 is clocked high-frequency, typically in a frequency range of about 10 kHz.
  • the driver module 1 is supplied with a DC voltage or a rectified AC voltage UO.
  • the current through the two LEDs can be effected by suitable selection of the switch-on time and the switch-off time of the switch S1. For example, these times may be selected to turn on the switch S1 when the current falls below a certain minimum reference value for the current through the first LED LED1, and the switch is turned off when the current through the first LED LED1 exceeds a maximum reference value ,
  • At least one filter capacitor C1 may be provided, which is connected in parallel with one or more LEDs.
  • the switches S2 and S4 arranged parallel to the LED are open.
  • a decoupling element for example a diode DB or a switch
  • the decoupling element is preferably arranged on the anode side of the respective LED (LED1 or LED2) to be decoupled.
  • a detection circuit is provided at least in the second LED LED2.
  • the LED used for monitoring second LED LED2 is selectively bridged.
  • the bridging phase is separated by a decoupling from the feeding switching regulator.
  • a switching regulator can feed a series circuit of LEDs, wherein individual LEDs are briefly bridged by a controllable switch S4 (this bridged second LED LED2 forms the monitored LED).
  • the single monitored LED LED2 is disconnected from the series circuit by a decoupling element (eg, a diode DB or a switch). As Entkoppelglied but can also serve another LED.
  • the current is detected by the monitored LED LED2 via the detection circuit.
  • the second LED LED2 is therefore referred to as a monitored LED, since it is monitored by means of the detection circuit for the measurement (to determine an operating parameter of the LED module 5).
  • the controllable switches S1 and S2 and S4 can be controlled by a common control circuit, which can preferably also evaluate the measurement on the second LED LED2 for determining an operating parameter of the LED module 5.
  • the common control circuit may be formed as an integrated circuit such as an ASIC or microcontroller.
  • the detection circuit can be switched on for this bridging phase, but it can also be permanently connected to the LED to be monitored and evaluated only for the bridging phase for detecting the current through the monitored LED LED2.
  • two switching regulator stages can also drive individual groups of LEDs (preferably two serial strings of LEDs).
  • LEDs preferably two serial strings of LEDs.
  • the two switching regulators K1 and K2 together form the driver module 1 and correspond in their basic structure and also in their function to the switching regulator shown in FIG.
  • At least one switching regulator (the switching regulator K2) has at the output, which feeds the LED, a controllable switch S4 connected in parallel with the output of the switching regulator K2.
  • a diode DB2 is optionally connected as a decoupling element. As Entkoppelglied but can also serve another LED or a switch.
  • a detection circuit connected to the LED LED2. With the aid of the detection circuit, the current injected by the monitored LED can be determined.
  • the further switching regulator (switching regulator K1) is also formed by a step-down converter for supplying an LED LED1, this may optionally also have a controllable switch S2 connected in parallel with the output of the switching regulator K1 and a diode DB1 as the decoupling element, the diode DB1 being connected between the output of the LED Switching regulator K1 with high potential P1 and the LED LED1 is activated.
  • switching regulator K1 switching regulator K1
  • the switching regulator K1 is also formed by a step-down converter for supplying an LED LED1
  • this may optionally also have a controllable switch S2 connected in parallel with the output of the switching regulator K1 and a diode DB1 as the decoupling element, the diode DB1 being connected between the output of the LED Switching regulator K1 with high potential P1 and the LED LED1 is activated.
  • there is an optical coupling OK between the first LED LED1 and the second LED LED2 in particular by a light guide, which forwards a part of the light
  • the second LED LED2 (as a monitored LED) selectively short-circuited by closing the controllable switch S4.
  • the second LED LED2 is now disconnected from the feeding switching regulator K2 by the decoupling element DB2.
  • the current through the second LED LED2 can now be detected as a monitored LED via the detection circuit Sense2.
  • the detection circuit can be switched on for this bridging phase, but it can also be permanently connected to the LED to be monitored and evaluated only for the bridging phase for detecting the current through the monitored LED.
  • the switching regulator K2 has a current source characteristic.
  • the switching regulator K2 designed as a step-down converter has a current control, so that the current through the LED LED2 is kept constant (at least during the clock phases during PWM dimming).
  • This arrangement has the advantage that in case of a short-term bridging by the controllable switch S4, the current is taken over by this, wherein the switching regulator K2 is not disturbed by this bridging in its operation. A brief bridging of the LED LED2 thus has no negative effect on the control loop or on the radiated light.
  • both switching regulators K1 and K2 each have the elements of the controllable switch S2 or S4 and the decoupling element DB1 or DB2 and a detection circuit, the two LEDs (LED1 or LED2) can monitor each other. As already explained, there is preferably an optical coupling OK between the two LEDs and both can each be bridged and decoupled for a short time.
  • a calibration measurement can also be carried out, for example, with a color measurement with a sensor 6 (for example an RGB color sensor, preferably a CCD sensor).
  • the sensor 6 can also be formed by a plurality of photodiodes, each having a color filter, so that the photodiodes can be excited only by specific wavelengths or wavelength ranges.
  • a sensor 6 can be coupled to the device as an additional sensor, and the device according to the invention can be calibrated with the aid of the sensor 6.
  • the color location and / or the intensity of the LED can be stored so that this information can be stored in the memory.
  • the individual LED modules 5 can be switched on and calibrated one after the other.
  • the calibration can be used to determine the colors of the connected LED modules 5. In this case, the individual colors or color locations and / or the intensities of the respectively driven LEDs are determined.
  • both a measurement with the second LED LED 2 used as the photodiode and with the sensor 6 are preferably carried out when the first LED LED 1 is operated. Based on the measurement with the sensor 6, the measurement result of the measurement with the second LED LED2 can be adjusted. For example, reference values can be stored in a table in the memory.
  • one or more LED modules 5 can be switched off.
  • 5 individually controllable channels can be selectively switched off within an LED module, so that the individually controllable LED on an LED module 5 can be selectively switched off.
  • the sensor 6 may be placed so that it can receive a part of the light emitted by the LED modules 5.
  • the sensor 6 may be placed so that it is shielded from ambient light and can only receive light emitted by the LED modules 5. This foreclosure can be done by a cover that is specially designed for the calibration measurement. On this cover 11, the sensor 6 may be located.
  • the sensor 6 can also be placed on the reflector 10 of the LED lamp.
  • the sensor 6 may be placed so as to directly or indirectly receive the light of the LED of the LED module 5.
  • the assignment of the colors and the mixture of the individual LEDs required for the output of a desired color by the LED illumination can be determined.

Landscapes

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

Abstract

L'invention concerne un dispositif servant à faire fonctionner des DEL et comprenant un module pilote (1), ainsi qu'un module de DEL (5) qui est commandé par le module pilote (1) et qui comprend au moins deux DEL (LED1, LED2). Le module pilote (1) contient un régulateur à découpage, et au moins selon un mode de fonctionnement une première DEL (LED1) est commandée de manière à émettre de la lumière, tandis que la seconde DEL (LED2) est utilisée en fonctionnement inverse comme photodiode et reçoit au moins une partie de la lumière émise par la première DEL (LED1); par ailleurs, une mesure intervient à la seconde DEL (LED2), servant à déterminer un paramètre de fonctionnement du module de DEL (5) et intervenant alors que cette seconde DEL (LED2) est pontée.
EP10719578.6A 2009-04-29 2010-04-28 Dispositif pour faire fonctionner des del Active EP2428098B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT2772009 2009-04-29
PCT/AT2010/000130 WO2010124309A2 (fr) 2009-04-29 2010-04-28 Dispositif pour faire fonctionner des del

Publications (2)

Publication Number Publication Date
EP2428098A2 true EP2428098A2 (fr) 2012-03-14
EP2428098B1 EP2428098B1 (fr) 2018-04-11

Family

ID=42340488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10719578.6A Active EP2428098B1 (fr) 2009-04-29 2010-04-28 Dispositif pour faire fonctionner des del

Country Status (4)

Country Link
EP (1) EP2428098B1 (fr)
AT (1) AT518887B1 (fr)
DE (1) DE112010001829A5 (fr)
WO (1) WO2010124309A2 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003510856A (ja) * 1999-09-29 2003-03-18 カラー・キネティックス・インコーポレーテッド 組合せ型照明及び較正装置及び複数のｌｅｄ用較正方法
US6498440B2 (en) * 2000-03-27 2002-12-24 Gentex Corporation Lamp assembly incorporating optical feedback
DE10248238A1 (de) * 2002-10-16 2004-04-29 Delphi Technologies, Inc., Troy Beleuchtungseinrichtung insbesondere für Kraftfahrzeuge
US7816638B2 (en) * 2004-03-30 2010-10-19 Phoseon Technology, Inc. LED array having array-based LED detectors
WO2006012737A1 (fr) * 2004-08-06 2006-02-09 Tir Systems Ltd. Systeme d'eclairage comprenant une emission et une detection photonique utilisant des elements electroluminescents
WO2007057822A1 (fr) * 2005-11-21 2007-05-24 Koninklijke Philips Electronics N.V. Dispositif d'eclairage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010124309A2 *

Also Published As

Publication number Publication date
AT518887B1 (de) 2018-02-15
WO2010124309A2 (fr) 2010-11-04
WO2010124309A3 (fr) 2011-12-15
EP2428098B1 (fr) 2018-04-11
DE112010001829A5 (de) 2012-05-31
AT518887A5 (de) 2018-02-15

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