EP2387290A1 - Modul zur Steuerung der Stromversorgung von LED-Gruppen - Google Patents

Modul zur Steuerung der Stromversorgung von LED-Gruppen Download PDF

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Publication number
EP2387290A1
EP2387290A1 EP11165302A EP11165302A EP2387290A1 EP 2387290 A1 EP2387290 A1 EP 2387290A1 EP 11165302 A EP11165302 A EP 11165302A EP 11165302 A EP11165302 A EP 11165302A EP 2387290 A1 EP2387290 A1 EP 2387290A1
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EP
European Patent Office
Prior art keywords
circuit
led
measurement
measuring
measuring device
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Granted
Application number
EP11165302A
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English (en)
French (fr)
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EP2387290B1 (de
Inventor
Loïc Flandre
Sylvain Yvon
Alain Dari
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.)
Valeo Vision SAS
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Valeo Vision SAS
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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]
    • H05B45/20—Controlling the colour 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]
    • H05B45/20—Controlling the colour of the light
    • H05B45/24—Controlling the colour of the light using electrical feedback from LEDs or from LED modules

Definitions

  • the field of the present invention is that of automotive lighting.
  • the invention relates to a lighting system based on light emitting diodes (English: Light Emitting Diodes) or LEDs.
  • the invention relates more specifically to a device for measuring characteristic parameters of a light-emitting diode.
  • the invention also relates to a control module of the power supply of this diode and its method.
  • a light emitting diode (or LED) is an electronic component capable of emitting light when traversed by an electric current.
  • Significant advances have led to major new applications such as lighting, including automotive lighting. Indeed, diodes can be used to illuminate, which is one of the key applications still under development.
  • the LEDs can be organized into sets, each set of LEDs fulfilling at least one lighting function such as high beams or a low beam for example.
  • the LEDs must be current-controlled, ie the LED control circuit must be able to define the current flowing through them, regardless of the number of LEDs placed in series.
  • the relationship between the voltage and the power supply of the LEDs is not linear. Thus, a small increase in voltage applied to the LED can cause a significant increase in the current and therefore in the luminous flux.
  • the conventional driving system is often an LED driver.
  • This component which controls the supply of LEDs from operating parameters, generally requires the presence of measuring means (in particular to prevent overheating of the LEDs) which consist of a complex circuit, with, for each set of LEDs, normally at least one inductor, capacitors, one or more diodes, several different power transistors and resistors.
  • the invention therefore proposes a fairly compact measuring device capable of measuring two or more parameters of a set of light-emitting diodes with a single circuit having different configurations.
  • the characteristic parameters of the set of LEDs may include the BIN resistor.
  • the value of this resistance is associated with the flow performance of a given LED or a set of LEDs of a given type as a function of the current through. This value, for example, allows a power management module of the LED or LEDs, to know what LED it is and what performance associated with it. The module can thus adapt the supply current of the LED, to obtain the numerin flux required in the lighting and / or signaling device containing this LED.
  • the characteristic parameters of the LED (s) may comprise the temperature and an adaptation is made as a function thereof.
  • the current is lowered if the temperature is too high or if the flow of an LED is too high when cold.
  • the transistors may be metal oxide-semiconductor field effect transistors, also called MOSFETs, for the Metal Oxide Semiconductor Field Effect Transistor.
  • MOSFET is a transistor comprising three electrodes respectively denoted drain, source and gate. The MOSFET can modulate the current that flows from the drain to the source, using a signal applied to its central electrode, namely the gate.
  • the MOSFET transistors are controlled by applying a signal to their gate.
  • the switching means may comprise switches performing the open / closed function of circuit parts for switching from one circuit configuration to another.
  • pull resistors are employed.
  • the device for measuring characteristic parameters of at least one set of LEDs can comprise means for triggering the switching means.
  • the triggering means are advantageously configured to place a first switching means in closed mode while preserving a second switching means in open mode, the transition from one circuit configuration to another being effected by reversing the closed mode and open two switching means.
  • triggering means may be configured to periodically trigger at least one of the parameter measurements. More specifically and in another embodiment, the triggering means are configured to trigger the measurement of at least one parameter periodically and / or to each power supply of the set of LEDs. This parameter can be the BIN value associated with an LED.
  • the switching means can be automated according to a defined time interval, and configured to successively create at least two configurations of the circuit.
  • An advantage of the presence of switching means preferably associated with tripping means is that it is possible to go from one measurement configuration to another immediately and according to a determined operating plane, in particular with a given acquisition period. and triggering a certain measurement at certain times (such as switching on) the operation of the LEDs.
  • the measurement circuit may comprise a single transistor and a single analog-to-digital converter.
  • the characteristic parameter measuring device may comprise at least two parallel circuits having common triggering means for measuring parameters of several sets of LEDs.
  • the device comprises several essentially identical and parallel circuits.
  • the invention offers a great flexibility of application, the number of sets of LEDs is not limited. And even with several sets of LEDs, the device is economical in terms of the number of components.
  • the present invention also relates to a control module of the power supply of at least one set of LEDs which comprises the measuring device described above. Since the device is less cumbersome and less complex than the solutions of the prior art, the control module is logically less bulky and less complex as well.
  • the module for controlling the power supply of at least one set of LEDs may comprise means for regulating the power supply as a function of the electrical values representative of the characteristic parameters of the LEDs.
  • the invention also relates to a lighting system comprising at least one set of light-emitting diodes (LEDs) and the control module described above.
  • LEDs light-emitting diodes
  • the figure 1 we see a measuring device 1 electrically connected to several sets of different light emitting diodes. From left to right, the figure 1 has a set of at least one LED for a code / route bifunction module HB / LB LED (HB / LB for High Beam / Low Beam) for the code / route function.
  • HB / LB LED HB / LB for High Beam / Low Beam
  • this set with an LED symbol.
  • it advantageously comprises several LEDs, such as two LEDs to perform the code function and an LED to perform the complementary route function.
  • a set of at least one LED for lighting on the sides CL LED (CL for Corner Light) then appears for side lighting, a set of at least one LED, C LB LED (CLB for Complementary Low Beam), for additional lighting in code fire mode, a set of at least one LED, DRL LED (DRL for Day Running Light), for daytime running lights and a set of at least one LED, TI LED (TI for Turn Indicator), for the direction change indicator.
  • CL LED CL for Corner Light
  • C LB LED C LB LED
  • DRL LED DRL LED
  • TI LED TI for Turn Indicator
  • a set of diodes which comprises at least one diode of a given type and generally more than one, may be associated with a BIN resistor and a NTC thermistor.
  • the diode connections have not been shown to simplify the figures.
  • the BIN resistor and the CTN thermistor are in series as illustrated on the figure 1 .
  • the diodes, the regulation block 9 and the control 10 of the switches are only shown on the figure 1 .
  • a measuring circuit 8 is associated with a set of diodes.
  • the measuring device 1 which is proposed can therefore comprise several measurement circuits 8. This is the case of the illustrations.
  • a reference voltage Vref is applied to each measurement circuit simultaneously. More specifically, the reference voltage Vref is applied to the resistance BIN of each set of at least one diode at node 2.
  • the reference voltage Vref may be produced in the measuring device or be a reference voltage external to said measuring device.
  • the measuring device is electrically connected to the electrical circuit of the corresponding set of LEDs, at the CTN thermistor at node 3, which represents a connection point between BIN and CTN.
  • connection node 3 between the resistor BIN and the CTN thermistor is connected to a measurement circuit 8 of the device 1.
  • This circuit 8 comprises a resistor 6, which is connected to the drain D of a transistor 5, which is in this example a MOSFET.
  • the source S of transistor 5 is earthed.
  • the link node 3 between the resistor BIN and the thermistor CTN is connected to the free end of the resistor 6 at a node 7. All the circuits 8 are connected at the level of the gates G of the transistors 5.
  • an AD converter analog digital converter is placed at the node 7 of connection between the resistor 6 and the link node 3 between the resistor BIN and the CTN thermistor.
  • the free ends of the NTC thermistors of the LEDs that is to say the nodes 4, are connected together and connected to the drain D of a single transistor 15, whose source S is connected to ground.
  • figure 1 shows the use of a plurality of transistors (referenced 5 and 15) to effect circuit configuration changes.
  • the choice of transistors for this function is only indicative and any means of circuit configuration change is within the scope of the invention.
  • the figure 1 also shows triggering means 10 able to control the switching of the transistors (or other functionally equivalent means).
  • the means 10 may comprise means for applying a power supply at the gate G of the transistor 15 according to a binary command illustrated by the terms ON-OFF. The circuit variations thus produced are subsequently described in detail.
  • the triggering means 10 may comprise means for applying a power supply at the gate G of the transistors 5. It will be seen, with reference to FIG. figure 2 in particular, that the means for applying a supply of transistors 5 and of transistor 15 are activated at different times.
  • the figure 1 illustrates, for each set of LEDs, a power supply that can be of conventional type to apply the necessary current to the LEDs.
  • the power supplies 8 are each controlled by a setpoint delivered by regulation means 9 using the values of the parameters coming from the measurement circuits 8.
  • the regulation means make it possible to carry out a feedback control of the supply current of a set of LEDs whose BIN has been determined, according to the temperature value resulting from the measurement using the CTN thermistor.
  • the value of BIN is a code describing the characteristics techniques of a LED in a short and simple way.
  • the features defined in the BIN can include color, hue, flux, and reverse voltage.
  • BIN is understood to mean any code making it possible to sort LEDs and to characterize them.
  • BIN resistance varies from one set of LEDs to another. The BIN of each LED is therefore measured independently. The BIN of an LED is fixed. An initial measure should then suffice.
  • a user of the system can replace one LED or one set of LEDs with another for different reasons, for example if it is defective or if there is a new need to know the value of the BIN when a driver change is made. Another measurement of BIN must then be made. So, as illustrated on the figure 2 , a measurement of BIN is performed at each power supply / activation of an LED. Whenever necessary, the triggering means 10 apply a signal to the gate G of the transistors 5. The circuit configuration obtained is that of the figure 3 .
  • the figure 2 also shows NTC thermistor measurements that represent the temperature of the LED.
  • the means 10 apply a signal to the gate G of the transistor 15, obtaining the configuration of the figure 4 .
  • events trigger BIN value measurements. This is the case of LED driver activation or initialization, which usually happens when the power is turned on.
  • an event is marked DRL for a set of LEDs associated with the daytime running light or DRL, TI for a set of LEDs associated with the change of direction indicator, and finally LB for a set of LEDs associated with the code.
  • DRL for a set of LEDs associated with the daytime running light or DRL
  • TI for a set of LEDs associated with the change of direction indicator
  • LB for a set of LEDs associated with the code.
  • a change of LEDs, driver or other event can also trigger this BIN value measurement.
  • the temperature measurement is performed more often, for example at a predetermined frequency, in the time intervals between two measurements of BIN.
  • the figure 3 shows a first configuration of the device 1 for measuring the BIN resistance for light-emitting diodes. For each diode, it is interesting to know the resistance of the LED Rbin-i.
  • the transistors are switched so that they are equivalent to a simple circuit connection.
  • the transistor 15 is equivalent to an open circuit.
  • the figure 4 shows a second configuration of the CTN thermistor measuring device for light-emitting diodes.
  • the present invention makes it possible to have a single measuring circuit. The number of connections to components associated with the LED to a measurement module is thus reduced, thus simplifying its design and cost.
  • the invention thus finds a particular advantage in a device comprising several LEDs and in particular in the context of a vehicle lighting device, such as a headlamp, comprising several LEDs assigned to different lighting functions and / or signaling.
  • FIGS. 5a and 5b show two other possibilities of implementing the invention with measuring circuits using switch switching.
  • the figure 5a shows two switches SW1 and SW introduced into the circuit of the measuring device 1.
  • two switches are sufficient for a measuring device 1 regardless of the number of measuring circuits 8, that is to say, the number of BIN and CTN or sets of LEDs.
  • the resistors R foot 1 and R foot 2 are connected to the ground whereas the switches SW1 and SW2 alternatively allow a voltage Vref to be applied. Switching is always done by triggering means 10.
  • the figure 5b shows a possible improvement in the measurement accuracy of the embodiment presented on the figure 5a .
  • the resistors R pullup 1 and R pullup 2 also called pull resistors are subjected to a voltage Vref while the switches SW1 and SW2 are connected to ground.
  • the closing of the switch SW1, while keeping the switch SW2 open, makes it possible to read the resistors of BIN, Rbin 1 , Rbin 2 in a manner similar to the previous cases at the points AD 1 and AD 2 .
  • the switch combination SW 1 open and SW 2 closed With the switch combination SW 1 open and SW 2 closed, the value of the thermistors CTN1 and CTN2 are determined at the outputs AD 1 and AD 2 .

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)
EP11165302.8A 2010-05-12 2011-05-09 Modul zur Steuerung der Stromversorgung von LED-Gruppen Active EP2387290B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1053738A FR2960119B1 (fr) 2010-05-12 2010-05-12 Module de pilotage d'alimentation d'ensembles de led

Publications (2)

Publication Number Publication Date
EP2387290A1 true EP2387290A1 (de) 2011-11-16
EP2387290B1 EP2387290B1 (de) 2020-03-25

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US (1) US8698427B2 (de)
EP (1) EP2387290B1 (de)
FR (1) FR2960119B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103249207A (zh) * 2012-02-10 2013-08-14 成爱林 双光控路灯开关
FR3042847A1 (fr) * 2015-10-23 2017-04-28 Valeo Vision Module lumineux pour un vehicule automobile a encodage bin electronique

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5464204B2 (ja) * 2011-12-28 2014-04-09 株式会社デンソー 発光駆動装置
DE102012224348A1 (de) 2012-06-25 2014-01-02 Osram Gmbh Beleuchtungsanlage mit einer Schnittstelle aufweisend ein Netzgerät und mindestens ein Lichtquellenmodul
DE102012110397A1 (de) 2012-10-30 2014-04-30 Epcos Ag Leuchtdiodenanordnung, Modul und Verfahren zur Herstellung einer Leuchtdiodenanordnung
TWI463477B (zh) * 2012-12-26 2014-12-01 Univ Nat Cheng Kung 用以組成光源組之點光源的料碼配量方法與其電腦程式產品
US10813181B2 (en) * 2013-03-14 2020-10-20 HELLA GmbH & Co. KGaA Vehicle control device and controlling lights
DE202015102078U1 (de) * 2015-04-27 2016-08-01 Zumtobel Lighting Gmbh Anordnung zur Beleuchtung
JP2017135225A (ja) * 2016-01-27 2017-08-03 シーシーエス株式会社 Ｌｅｄ光射出装置に用いられる電源装置
KR101822889B1 (ko) * 2016-06-14 2018-03-08 엘지전자 주식회사 리어 콤비네이션 램프의 입력 전압 안정화 회로, 리어 콤비네이션 램프 및 차량
FR3085099B1 (fr) * 2018-06-22 2023-06-30 Valeo Vision Dispositif de pilotage de l'alimentation electrique de sources lumineuses d'un vehicule automobile en fonction des variations de leurs temperatures
FR3107748B1 (fr) * 2020-02-27 2022-08-05 Valeo Iluminacion Sa Arrangement lumineux automobile

Citations (5)

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Publication number Priority date Publication date Assignee Title
EP1244334A2 (de) * 2001-03-22 2002-09-25 Hella KG Hueck & Co. Schaltungsanordnung für eine LED Leuchte
US20040056774A1 (en) * 2002-07-04 2004-03-25 Patent-Treuhand-Gesellschaft Fur Elektrisch Gluhlampen Mbh Supply unit
EP1411750A2 (de) * 2002-10-16 2004-04-21 CCS Inc. Stromversorgungssystem für eine Lumineszenzdiodeneinheit
EP1517588A1 (de) * 2003-09-17 2005-03-23 Moritex Corporation Verfahren und Vorrichtung zum Anschluss eines Scheinwerfers
EP1848249A1 (de) * 2006-04-20 2007-10-24 Valeo Vision LED-Bedienvorrichtung für einen Fahrzeugscheinwerfer

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US7015654B1 (en) * 2001-11-16 2006-03-21 Laughing Rabbit, Inc. Light emitting diode driver circuit and method
US7902771B2 (en) * 2006-11-21 2011-03-08 Exclara, Inc. Time division modulation with average current regulation for independent control of arrays of light emitting diodes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1244334A2 (de) * 2001-03-22 2002-09-25 Hella KG Hueck & Co. Schaltungsanordnung für eine LED Leuchte
US20040056774A1 (en) * 2002-07-04 2004-03-25 Patent-Treuhand-Gesellschaft Fur Elektrisch Gluhlampen Mbh Supply unit
EP1411750A2 (de) * 2002-10-16 2004-04-21 CCS Inc. Stromversorgungssystem für eine Lumineszenzdiodeneinheit
EP1517588A1 (de) * 2003-09-17 2005-03-23 Moritex Corporation Verfahren und Vorrichtung zum Anschluss eines Scheinwerfers
EP1848249A1 (de) * 2006-04-20 2007-10-24 Valeo Vision LED-Bedienvorrichtung für einen Fahrzeugscheinwerfer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103249207A (zh) * 2012-02-10 2013-08-14 成爱林 双光控路灯开关
FR3042847A1 (fr) * 2015-10-23 2017-04-28 Valeo Vision Module lumineux pour un vehicule automobile a encodage bin electronique

Also Published As

Publication number Publication date
US20110279058A1 (en) 2011-11-17
EP2387290B1 (de) 2020-03-25
FR2960119A1 (fr) 2011-11-18
US8698427B2 (en) 2014-04-15
FR2960119B1 (fr) 2012-08-03

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