EP1035754A2 - Dispositif de signalisation à diode électroluminescente - Google Patents

Dispositif de signalisation à diode électroluminescente Download PDF

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Publication number
EP1035754A2
EP1035754A2 EP00104197A EP00104197A EP1035754A2 EP 1035754 A2 EP1035754 A2 EP 1035754A2 EP 00104197 A EP00104197 A EP 00104197A EP 00104197 A EP00104197 A EP 00104197A EP 1035754 A2 EP1035754 A2 EP 1035754A2
Authority
EP
European Patent Office
Prior art keywords
light
emitting diode
current
operating
led
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
EP00104197A
Other languages
German (de)
English (en)
Other versions
EP1035754A3 (fr
EP1035754B1 (fr
Inventor
Jürgen Dipl.-Ing.(FH) Adams
Werner Ing. Grad. Baldenhofer
Michael Dipl.-Ing.(FH) Krieg
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.)
Continental Automotive GmbH
Original Assignee
Mannesmann VDO AG
Siemens AG
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 Mannesmann VDO AG, Siemens AG filed Critical Mannesmann VDO AG
Publication of EP1035754A2 publication Critical patent/EP1035754A2/fr
Publication of EP1035754A3 publication Critical patent/EP1035754A3/fr
Application granted granted Critical
Publication of EP1035754B1 publication Critical patent/EP1035754B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B45/14—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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits

Definitions

  • the invention relates to a device for displaying a message with a LED and a controlling the operating current of the LED Control unit according to the preamble of the first claim.
  • the invention relates to a combination of several in one vehicle arranged control lights, each control light with a light emitting diode and the indicator light gives the driver a specific message mediated.
  • Such indicator lights can be, for example, in one in one Dashboard of the vehicle arranged instrument cluster be, the instrument cluster in its assembly several indicating Devices united.
  • the solution takes advantage of the knowledge that the human eye Perceives changes in intensity of a visual display more than one static display.
  • the perception of a certain message is therefore not depends only on the light intensity with which a light source shines, but also how much the display of the message differs from its surroundings differs.
  • Especially when there are several indicator lights in a group operated in an instrument cluster in the dashboard of a vehicle can be a driver's attention to a particular message be significantly increased by the fact that this message flashes from the other messages stand out.
  • Increasing the visibility of a message The more important, the more indicator lights are provided, of which each one to achieve its signal effect in a specific way must take off. In today's commercial vehicles can be thirty and more Indicator lights are present, so it is important to find a solution a single message in the flood of all flowing in on the driver Highlight messages.
  • This effect is achieved according to the invention in that the control unit, which controls the operating current of the light emitting diode to raise the Signal effect of the message briefly the operating current of the LED repeatedly rises above the other level of the operating current.
  • This Operating mode of a light emitting diode can be realized both with light emitting diodes which are continuously energized and thus shine permanently as even with light-emitting diodes, whose operating current in a certain cycle periodically turned on to turn the LED into a flashing Relocate operation. In the latter case, it is understood that the brief periodic increase in the operating current of the LED the other level of operating current is of an appropriately shorter duration than the active phase of the blinking of the light emitting diode.
  • FIG. 1 shows the mode of operation according to the invention in three time diagrams Led.
  • Figures 2 and 3 show circuit arrangements for Realization of the operation of a light emitting diode according to the invention.
  • the operating current I LED for a light-emitting diode is plotted over the time axis t.
  • two short current pulses I P are shown as examples. They should also be impressed on the other level, ie the normal case for the operating current I N of the light-emitting diode.
  • the normal case for the operating current I N of the light-emitting diode thus relates to the level for the operating current I N with which the light-emitting diode is normally energized in order to make it light up, be it for a permanent lighting up or a flashing operating mode.
  • the current pulse I P is triggered periodically by a control unit to increase its signal effect.
  • the repetition time t w for the current pulse I P can be freely programmable. However, it is usually adapted to the usual flashing frequency for generic indicator lights. It has proven to be advantageous to measure the duration t P of the current pulses I P at approximately 170 to 200 milliseconds.
  • the intensity of the current pulses I P depends on the performance data of the light-emitting diode used, because the averaged power loss occurring at the light-emitting diode should remain within the load limits applicable to the light-emitting diode, even in the case of high operating temperatures, in order not to unnecessarily increase the operating time of the light-emitting diode due to an excessive current load Reduce.
  • the periodic current pulse I P is superimposed on an operating current I N permanently connected to the light-emitting diode.
  • the light-emitting diode is operated flashing, the operating current I N of the light-emitting diode being switched on again in a certain flashing cycle t T after its decay.
  • a current pulse I P is additionally impressed on the operating current I N in each active flashing period t B.
  • the exact position of the current pulse I P within the active flashing period t B is not critical. However, the current pulse I P should preferably always occur at the same point in all active flashing periods. In the case shown, the current pulse I P takes place with the rising edge of the operating current I N at the beginning of each active flashing period t B.
  • FIG. 2 now show an example of circuit arrangements with which the inventive mode of operation of a light emitting diode can be carried out.
  • both circuit arrangements have four light-emitting diodes 1, 2, 3 and 4, which are each operated with a series resistor 5, 6, 7 and 8 connected in series with them.
  • the anode of the light-emitting diodes 1, 2, 3 and 4 is connected to the operating voltage UB.
  • the cathode of the light-emitting diodes 1, 2, 3 and 4 is connected to the outputs of a shift register 11 via series resistors 5, 6, 7 and 8.
  • the current path therefore leads from the line for the operating voltage UB through the light-emitting diodes 1, 2, 3 and 4 and the series resistors 5, 6, 7 and 8 to the outputs of the shift register 11.
  • the light-emitting diodes 3 and 4 are intended to amplify whose signal effect, the operating current I LED according to the invention are briefly raised above the other level of the operating current I N.
  • the cathode of the light-emitting diode 3 is additionally connected via a resistor 9 and the cathode of the light-emitting diode 4 additionally via a resistor 10 to the outputs of a further shift register 12.
  • Both shift registers 11 and 12 receive their data from a control unit which is preferably designed as a microprocessor, but which is not shown in FIGS. 2 and 3.
  • the data coming from the control unit are read in serially over a data line D from the shift registers 11 and 12 in a time cycle.
  • This clock is given to the shift registers 11 and 12 via a clock line T.
  • the outputs of the shift register 11 are switched active or passive by means of a line F1. With shift register 12, the outputs are activated or passivated via a line F2.
  • a flashing mode of operation of the light-emitting diodes 1, 2, 3 or 4 is achieved, for example, by periodically changing the data content transmitted via the data line D.
  • a current flow through the resistors 9 or 10 is additionally permitted by means of the enable signal transmitted via line F2 to the shift register 12 .
  • the enable signal transmitted via line F2 causes the outputs of the shift register 12 to assume an electrical potential which is sufficiently lower than the operating voltage UB.
  • the current components through the resistors 7 and 9 or 8 and 10 add up.
  • the release signal transmitted via line F2 can be used to control how long and in what time period t w an additionally the operating current I N additional current flow I P is permitted by the LED 3 or 4. If the LEDs 1, 2, 3 or 4 are operated flashing by the shift register 11, this enable signal transmitted via line F2 is to be synchronized with the enable signal on line F1.
  • the signal effect of the light emitting diodes 3 or 4 is amplified differently from the circuit arrangement according to FIG. 2 in that, in the light emitting diodes 3 and 4 provided for the enhanced signal effect, the voltage level UL is briefly raised for their operation.
  • the voltage level UL at the anode of the light-emitting diodes 3 and 4 is accordingly reduced in normal operation by measures in a functional element 13 compared to the operating voltage UB supplying the circuit arrangement.
  • the current flowing through the light-emitting diodes 3 and 4 is limited by an element limiting current connected in series with them, which in this case occurs in the specific case through the resistors 7 and 8.
  • resistors 7 and 8 are dimensioned such that in normal operation the current through the LEDs 3 and 4 corresponds to the current through the LEDs 1 and 2, which are not provided for amplifying their signal effect.
  • the voltage level UL at the anode of the light-emitting diodes 3 and 4 is raised to the level of the operating voltage UB by the functional element 13 changing the current path between the line for the circuit arrangement supplying operating voltage UB and the anode of the light emitting diodes 3 and 4 is switched through practically without restriction.
  • the functional element 13 can include, for example, a Zener diode Z for lowering the operating voltage UB to the voltage level UL and a transistor T connected in parallel with the Zener diode Z.
  • the transistor T is switched on or off by a control signal FS coming from a control unit.
  • the transistor T switches on at the instigation of the control signal FS, as a result of which the zener diode Z is short-circuited and the voltage drop which otherwise exists across it is canceled.
  • the circuit arrangement according to FIG. 3 saves a second shift register 12 and the additional resistors 9 and 10 compared to the circuit arrangement according to FIG. Otherwise, the circuit arrangement according to FIG. 3 can be controlled in the same way via the data line D and by means of the enable signal transmitted via line F1 as the circuit arrangement according to FIG. 2.
EP00104197A 1999-03-06 2000-03-01 Dispositif de signalisation à diode électroluminescente Expired - Lifetime EP1035754B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19909950 1999-03-06
DE19909950A DE19909950A1 (de) 1999-03-06 1999-03-06 Vorrichtung zum Anzeigen einer Meldung mit einer Leuchtdiode

Publications (3)

Publication Number Publication Date
EP1035754A2 true EP1035754A2 (fr) 2000-09-13
EP1035754A3 EP1035754A3 (fr) 2001-12-05
EP1035754B1 EP1035754B1 (fr) 2008-08-13

Family

ID=7899976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00104197A Expired - Lifetime EP1035754B1 (fr) 1999-03-06 2000-03-01 Dispositif de signalisation à diode électroluminescente

Country Status (3)

Country Link
EP (1) EP1035754B1 (fr)
AT (1) ATE405135T1 (fr)
DE (2) DE19909950A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2889643A1 (fr) * 2005-08-08 2007-02-09 Valeo Systemes Thermiques Ajustement de l'intensite lumineuse, notamment d'un tableau de commande pour vehicule automobile
CN100393177C (zh) * 2000-12-27 2008-06-04 皇家菲利浦电子有限公司 带有电调节色彩平衡的led光源

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004060483B4 (de) * 2004-12-16 2018-06-07 HELLA GmbH & Co. KGaA Verfahren zum Betreiben einer Lichtblitzwarneinrichtung mit mindestens einer Leuchtdiode
FR2998035A1 (fr) * 2013-05-07 2014-05-16 Continental Automotive France Dispositif d'eclairage pour vehicule automobile
DE102015116492A1 (de) 2015-09-29 2017-03-30 Eaton Electrical Ip Gmbh & Co. Kg Steuerschaltung zum Ansteuern von mehreren Leuchtdioden und Befehls- und / oder Meldegerät mit der Steuerschaltung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2711884A1 (fr) * 1993-10-29 1995-05-05 Solartec Sarl Dispositif de signalisation notamment pour la signalisation routière, aéronautique ou maritime.
FR2714564A1 (fr) * 1993-12-28 1995-06-30 Etat Francais Labo Cl Ponts Ch Procédé de commande d'une source lumineuse, moyens pour la mise en Óoeuvre de ce procédé et dispositif équipé des dits moyens.
US5783909A (en) * 1997-01-10 1998-07-21 Relume Corporation Maintaining LED luminous intensity
US5850126A (en) * 1997-04-11 1998-12-15 Kanbar; Maurice S. Screw-in led lamp
EP0890894A1 (fr) * 1997-07-08 1999-01-13 Korry Electronics Co. Circuit LED d'adaptation à lampe à incadescence

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2711884A1 (fr) * 1993-10-29 1995-05-05 Solartec Sarl Dispositif de signalisation notamment pour la signalisation routière, aéronautique ou maritime.
FR2714564A1 (fr) * 1993-12-28 1995-06-30 Etat Francais Labo Cl Ponts Ch Procédé de commande d'une source lumineuse, moyens pour la mise en Óoeuvre de ce procédé et dispositif équipé des dits moyens.
US5783909A (en) * 1997-01-10 1998-07-21 Relume Corporation Maintaining LED luminous intensity
US5850126A (en) * 1997-04-11 1998-12-15 Kanbar; Maurice S. Screw-in led lamp
EP0890894A1 (fr) * 1997-07-08 1999-01-13 Korry Electronics Co. Circuit LED d'adaptation à lampe à incadescence

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100393177C (zh) * 2000-12-27 2008-06-04 皇家菲利浦电子有限公司 带有电调节色彩平衡的led光源
FR2889643A1 (fr) * 2005-08-08 2007-02-09 Valeo Systemes Thermiques Ajustement de l'intensite lumineuse, notamment d'un tableau de commande pour vehicule automobile

Also Published As

Publication number Publication date
EP1035754A3 (fr) 2001-12-05
ATE405135T1 (de) 2008-08-15
EP1035754B1 (fr) 2008-08-13
DE50015302D1 (de) 2008-09-25
DE19909950A1 (de) 2000-09-07

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