EP1035754A2 - Vorrichtung zum Anzeigen einer Meldung mit einer Leuchtdiode - Google Patents
Vorrichtung zum Anzeigen einer Meldung mit einer Leuchtdiode Download PDFInfo
- 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
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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.
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
- Audible And Visible Signals (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
- Led Devices (AREA)
Abstract
Description
Claims (7)
- Vorrichtung zum Anzeigen einer Meldung mit einer Leuchtdiode und einer den Betriebsstrom der Leuchtdiode steuernden Steuereinheit,
dadurch gekennzeichnet,
daß die Steuereinheit zur Anhebung der Signalwirkung der Meldung den Betriebsstrom (ILED) der Leuchtdiode (1, 2, 3 oder 4) kurzzeitig wiederholt über das sonstige Niveau des Betriebsstroms (IN) anhebt. - Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß die Anhebung des Betriebsstroms (ILED) der Leuchtdiode (1, 2, 3 oder 4) dadurch erfolgt, daß parallel zu einem in Reihe mit der Leuchtdiode (1, 2, 3 oder 4) geschalteten Vorwiderstand (7 oder 8) ein weiterer durch einen Widerstand (9 oder 10) strombegrenzter Strompfad gegen ein gegenüber der an der Anode der Leuchtdiode (1, 2, 3 oder 4) anliegenden Betriebsspannung (UB) ausreichend abgesenktes elektrisches Potential durch Signale (D, F1, F2) der Steuereinheit freigeschaltet wird. - Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß die Anhebung des Betriebsstroms (ILED) der für die kurzzeitige Signalverstärkung vorgesehenen Leuchtdiode (3 oder 4) dadurch erfolgt,a) daß ein einen Spannungsabfall erzeugendes Element (Z) vorgesehen ist, welches das an der Anode der Leuchtdiode (3 oder 4) anliegende Spannungsniveau (UL) gegenüber der Betriebsspannung (UB) für eine andere Leuchtdiode (1 oder 2), bei der eine Signalverstärkung nicht vorgesehen ist, absenkt,b) daß ein Strom begrenzendes Element (7 oder 8) vorgesehen ist, welches den Strom, der durch die für die Signalverstärkung vorgesehenen Leuchtdiode (3 oder 4) fließt, so einstellt, daß dieser Strom im Normalfall dem Strom entspricht, der durch die andere Leuchtdiode (1 oder 2) fließt, bei der eine Signalverstärkung nicht vorgesehen ist,c) daß ein schaltendes Element (T) vorgesehen ist, welches für den Fall, daß für die Leuchtdiode (3 oder 4) eine Signalverstärkung gewünscht wird, das einen Spannungsabfall erzeugende Element (Z) auf Veranlassung eines von der Steuereinheit kommenden Steuersignals (FS) überbrückt, wodurch der Betriebsstrom (ILED) durch die für die Signalverstärkung vorgesehene Leuchtdiode (3 oder 4) angehoben wird. - Vorrichtung nach einem der vorangegangenen Ansprüche,
dadurch gekennzeichnet,
daß die Steuereinheit periodisch einen Stromimpuls (IP) ausgelöst, der dem sonstigen Niveau des Betriebsstroms (IN) für die Leuchtdiode (1, 2, 3, oder 4) überlagert wird, wobei die Wiederholzeit (tw) für den Stromimpuls (IP) zwar frei programmierbar, aber dem üblichen Blinktakt (tT) für gattungsgemäße Kontrolleuchten angepaßt ist. - Vorrichtung nach einem der vorangegangenen Ansprüche,
dadurch gekennzeichnet,
daß die Dauer (tP) der Stromimpulse (IP) etwa 170 bis 200 Millisekunden beträgt. - Vorrichtung nach einem der vorangegangenen Ansprüche,
dadurch gekennzeichnet,
daß bei blinkender Betriebsweise der Leuchtdiode (1, 2, 3, oder 4) die Dauer (tP) der Stromimpulse (IP) erkennbar kürzer ist als eine aktive Blinkperiode (tB), in der der Betriebsstrom (IN) für die Leuchtdiode (1, 2, 3, oder 4) eingeschaltet ist. - Vorrichtung nach einem der vorangegangenen Ansprüche,
dadurch gekennzeichnet,
daß die Steuereinheit die Intensität des Stromimpulses (IP) den Leistungsdaten der verwendeten Leuchtdiode (1, 2, 3, oder 4) anpaßt, so daß die gemittelte an der Leuchtdiode (1, 2, 3, oder 4) auftretende Verlustleistung auch bei hohen Betriebstemperaturen innerhalb der für die Leuchtdiode (1, 2, 3, oder 4) geltenden Belastbarkeitsgrenzen bleibt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19909950A DE19909950A1 (de) | 1999-03-06 | 1999-03-06 | Vorrichtung zum Anzeigen einer Meldung mit einer Leuchtdiode |
DE19909950 | 1999-03-06 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1035754A2 true EP1035754A2 (de) | 2000-09-13 |
EP1035754A3 EP1035754A3 (de) | 2001-12-05 |
EP1035754B1 EP1035754B1 (de) | 2008-08-13 |
Family
ID=7899976
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00104197A Expired - Lifetime EP1035754B1 (de) | 1999-03-06 | 2000-03-01 | Vorrichtung zum Anzeigen einer Meldung mit einer Leuchtdiode |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1035754B1 (de) |
AT (1) | ATE405135T1 (de) |
DE (2) | DE19909950A1 (de) |
Cited By (2)
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)
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)
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 (de) * | 1997-07-08 | 1999-01-13 | Korry Electronics Co. | LED-Schaltkreis zur Anpassung an Glühlampenhelligkeit |
-
1999
- 1999-03-06 DE DE19909950A patent/DE19909950A1/de not_active Withdrawn
-
2000
- 2000-03-01 EP EP00104197A patent/EP1035754B1/de not_active Expired - Lifetime
- 2000-03-01 AT AT00104197T patent/ATE405135T1/de not_active IP Right Cessation
- 2000-03-01 DE DE50015302T patent/DE50015302D1/de not_active Expired - Lifetime
Patent Citations (5)
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 (de) * | 1997-07-08 | 1999-01-13 | Korry Electronics Co. | LED-Schaltkreis zur Anpassung an Glühlampenhelligkeit |
Cited By (2)
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 (de) | 2001-12-05 |
DE19909950A1 (de) | 2000-09-07 |
EP1035754B1 (de) | 2008-08-13 |
DE50015302D1 (de) | 2008-09-25 |
ATE405135T1 (de) | 2008-08-15 |
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