EP1083774A2 - Luminaire à diodes électroluminescentes - Google Patents

Luminaire à diodes électroluminescentes Download PDF

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Publication number
EP1083774A2
EP1083774A2 EP00119068A EP00119068A EP1083774A2 EP 1083774 A2 EP1083774 A2 EP 1083774A2 EP 00119068 A EP00119068 A EP 00119068A EP 00119068 A EP00119068 A EP 00119068A EP 1083774 A2 EP1083774 A2 EP 1083774A2
Authority
EP
European Patent Office
Prior art keywords
light
led
temperature
emitting diode
led light
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.)
Withdrawn
Application number
EP00119068A
Other languages
German (de)
English (en)
Other versions
EP1083774A3 (fr
Inventor
Klaus Dipl.Ing. Nachtigall
Hubert Dipl.Phys. Zwick
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.)
Hella GmbH and Co KGaA
Original Assignee
Hella KGaA Huek and Co
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 Hella KGaA Huek and Co filed Critical Hella KGaA Huek and Co
Publication of EP1083774A2 publication Critical patent/EP1083774A2/fr
Publication of EP1083774A3 publication Critical patent/EP1083774A3/fr
Withdrawn legal-status Critical Current

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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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs

Definitions

  • the invention relates to an LED light for motor vehicles, the has at least one light-emitting diode as the light source.
  • Such an LED light is known from DE 197 28 763 A1. She has several light-emitting diodes connected in series, which a PTC resistor is connected upstream. The PTC resistance increases at increasing temperature its electrical resistance and limited thereby the operating current of the LEDs. The LEDs are each operated with an operating current that is less than or equal to that permitted at the respective ambient temperature The maximum current of the LEDs is. Between the cold operation and the case of high operating temperature finds a sliding Current reduction instead of the constant supply voltage of depends on the temperature of the PTC resistor.
  • the previously known LED light has the disadvantage, however, that the operating current of the Light emitting diodes, especially at high ambient temperatures a correspondingly large voltage at the PTC resistor drops, a power loss on the PTC resistor causes that as heat is released to the environment and to warm the LEDs contributes. Despite the reduced at high temperatures Operating current also occurs at the LEDs themselves certain power loss, whereby these are additionally heated. The LEDs must therefore be comparatively high Operating temperature must be dimensioned, which is why the manufacture of the LED light is still comparatively expensive.
  • a protective circuit which has at least one Temperature sensor for measuring the ambient temperature and at least a switching means for switching off the LED (s) when exceeded a predetermined temperature threshold.
  • At least one light emitting diode is used for the If a predetermined temperature threshold is exceeded, switched off.
  • a predetermined temperature threshold is exceeded, switched off.
  • the invention can be used especially with such LED lights, which is not used or only rarely used at high ambient temperatures become. For example, one is used as a reading lamp in one Motor vehicle-provided LED lights usually in strong Sun exposure and therefore not at high ambient temperatures switched on, so that the deactivation of the LED (s) at these Temperatures from the user of the lamp practically not as disadvantageous is felt.
  • LED light according to the invention in comparison to an LED light, in which the LED current is reduced at high temperatures, the light emitting diode (s) for a correspondingly smaller one, by the Temperature threshold value of the protective circuit specified operating temperature be dimensioned, making the LED light inexpensive can be manufactured.
  • An interior light is already known from DE 44 10 584 C1, which has two light bulbs as light sources, at least of which a by means of a protective circuit having a temperature sensor is switched off when a predetermined temperature threshold is exceeded.
  • the protection circuit is only for the protection of light bulbs illuminated components of the lamp in front of the in comparison to a light emitting diode significantly higher operating temperature Light bulbs, but not intended to protect the light bulbs themselves.
  • Temperature sensor and the switching means through a bimetal switch educated This can be done, for example, with the LED (s) be connected in series. Overall, this results in one LED light that can be manufactured particularly cost-effectively.
  • the temperature sensor connected to a comparison device for comparison it with the temperature sensor determined temperature measurement the temperature threshold, the comparison device with the Switching means for switching off the LED (s) in control connection stands.
  • the temperature sensor can be, for example, a hot or PTC thermistor.
  • the LED (s) is (are) below Avoidance of mechanical contact prone to overheating protected.
  • the temperature sensor is thermal is conductively connected to the LED (s).
  • the light emitting diode is then even better against their high junction temperature pn junction protected.
  • the LED light on several LEDs at least one this light-emitting diode is designed for an operating temperature, which is greater than the temperature threshold of the protection circuit for the other LEDs and the one for the larger one Operating temperature trained (n) LED (s) in front of the Protection circuit connected to a common power supply is (are). So it only becomes part of the light emitting diodes of the LED light switched off when the temperature threshold is exceeded, while the other LEDs continue to be energized. Thus, at least one remains even at high ambient temperatures LED activated so that the user of the LED light can detect proper function. If necessary, the LED (s) designed for the higher operating temperature have a different color than the other LEDs.
  • the for the larger operating temperature trained LED (s) can (can) also at least when the temperature limit is exceeded be supplied with an operating current that is smaller than the operating current of the other LEDs at a temperature which is less than the temperature threshold.
  • the LED light is arranged in a makeup mirror and for manual switching on and off whose LED (s) is at least an electrical switch is provided, in particular by Positioning the makeup mirror in the viewing position and / or by positioning one intended for the makeup mirror Cover is actuated.
  • a makeup mirror usually comes with high ambient temperature is not used, the user the LED light deactivates the LED (s) at high Virtually don't notice temperatures.
  • the LEDs can be protected from overheating practically without sacrificing comfort.
  • temperatures below the temperature threshold the LEDs then with a correspondingly large operating current be energized without the risk of thermal damage the LEDs are given. The LED light therefore shines Temperatures below the temperature threshold one accordingly great light intensity.
  • the LED light adjacent to a door handle of a vehicle door arranged to illuminate the door handle and / or the door apron.
  • the LED light is usually only at night and therefore at ambient temperatures below the Temperature threshold must be switched on.
  • the LED light can for this purpose, for example, on the switch for switching on and / or off the low beam of the motor vehicle.
  • a light-emitting diode for motor vehicles, generally designated 1 has a plurality of light-emitting diodes 2a, 2b as the light source.
  • the exemplary embodiment according to FIG. 1 is part of these light-emitting diodes 2a, 2b assigned a protective circuit that a bimetal switch 3 for switching off the light-emitting diodes 2a when exceeding one predetermined temperature threshold.
  • the bimetal switch 3 is connected in series with the LEDs 2a and opens its Switch contacts when the temperature of the switch contacts the predetermined temperature threshold, which may be, for example, 60 ° C can, exceeds.
  • the connecting branch between the first Connections 4a of the light emitting diodes 2a and the first power supply connection 5 of a power supply for the LED light 1 is then interrupted so that the LEDs 2a are de-energized. Thereby overheating of the light emitting diodes 2a is avoided.
  • the light emitting diodes 2a need only for a comparatively small Temperature threshold corresponding to the maximum operating temperature to be dimensioned, which is a correspondingly inexpensive LED light 1 enables.
  • the protective circuit has a comparison device 9, one input of which is connected to a first connection 10 of a temperature sensor 11 designed as a temperature-dependent electrical resistor.
  • the second connection 12 of the temperature sensor 11 is connected to the second supply connection 8 of the power supply.
  • the temperature sensor 11 is connected in series with an electrical resistor, not shown in the drawing, which is connected with its one connection to the first connection 10 of the temperature sensor 11 and with its second connection to the first supply connection 5 of the power supply.
  • a reference potential which defines the temperature threshold value is present at a second input of the comparison device 9, which is not shown in the drawing.
  • the switching output 13 of the comparison device 9 is connected to the first connection 4a of the light-emitting diodes 2a via the current limiting resistors 6a.
  • the comparison device 9 has an electrical switching means which is in control connection with the temperature sensor 11 and by means of which an electrical potential corresponding to the potential of the second supply connection 8 is applied to the switching output 13 when the predetermined temperature threshold value is exceeded.
  • the LEDs 2a are then de-energized. If the ambient temperature measured by means of the temperature sensor 11 falls below the predetermined temperature threshold value, a potential corresponding to the potential of the first supply connection 5 of the power supply is present at the switching output 13, as a result of which the light-emitting diodes 2a are energized with a predetermined operating current.
  • the light-emitting diodes 2a are connected to the bimetal switch 3 (FIG. 1) or the temperature sensor 11 (Fig.2) thermally connected. In in the drawing, this is in each case by a dashed line clarifies.
  • the light emitting diode 2b is with its connections 4b, 7b in front of the Protection circuit at the supply connections 5, 8 of the power supply connected.
  • This LED 2b is for one Operating temperature dimensioned, which is greater than the temperature threshold the protection circuit for the other LEDs 2a.
  • the between the first supply connection 5 and the first Connection 4b of the light emitting diode 2b arranged current limiting resistor 6b has a greater electrical resistance than the current limiting resistors 6a of the light emitting diode 2a, i.e. the Operating current of the LED 2b is less than the operating current of the light emitting diodes 2a.
  • the LED 2b thus also serves as a function display, which the user especially at ambient temperatures, the larger are than the temperature threshold, the proper function the LED light 1 signals.
  • the LED 2b can optionally be a colored light emitting diode while the light emitting diodes 2a are preferably white.
  • the LED light 1 is adjacent to a makeup mirror arranged on the headlining of the motor vehicle pivotable from a rest position into a viewing position is stored.
  • the makeup mirror or one that can be swiveled with it Part is connected to an electrical switch 14, the Switch contacts when positioning the makeup mirror in Viewing position closed and open in the rest position.
  • the electrical switch 14 is between the supply connection 5 of the power supply and the LEDs 2a, 2b arranged.
  • the LED light 1 for motor vehicles therefore, has a light source at least one light-emitting diode 2a, for which a protective circuit is provided.
  • This has at least one temperature sensor 11 Measurement of the ambient temperature and at least one switching device to switch off the light-emitting diode (s) 2a when a predetermined temperature threshold.

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  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP00119068A 1999-09-10 2000-09-02 Luminaire à diodes électroluminescentes Withdrawn EP1083774A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19943345 1999-09-10
DE19943345A DE19943345A1 (de) 1999-09-10 1999-09-10 LED-Leuchte

Publications (2)

Publication Number Publication Date
EP1083774A2 true EP1083774A2 (fr) 2001-03-14
EP1083774A3 EP1083774A3 (fr) 2002-01-30

Family

ID=7921517

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00119068A Withdrawn EP1083774A3 (fr) 1999-09-10 2000-09-02 Luminaire à diodes électroluminescentes

Country Status (2)

Country Link
EP (1) EP1083774A3 (fr)
DE (1) DE19943345A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1313353A1 (fr) * 2001-11-19 2003-05-21 Nokia Corporation Procédé et dispositif pour commander une diode LED
WO2004002198A1 (fr) * 2002-06-25 2003-12-31 Koninklijke Philips Electronics N.V. Systeme destine a conserver les caracteristiques lumineuses d'un boitier multipuce a diode electroluminescente (del)
EP2066149A3 (fr) * 2007-11-27 2009-08-19 Stefan Ruppel Lampe plate DEL dotée d'une platine dissipant la chaleur, notamment pour meuble
WO2011104262A1 (fr) * 2010-02-23 2011-09-01 Tridonic Ag Protection de led contre une surchauffe et un courant traversant trop élevé
WO2013160400A1 (fr) * 2012-04-26 2013-10-31 Zumtobel Lighting Gmbh Ensemble de led

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10239449B4 (de) * 2002-02-06 2013-10-24 Ulrich Kuipers Verfahren und Vorrichtung zur Realisierung von LED-Leuchten mit Farb- und Helligkeitseinstellung und dem dazugehörigen Bedienelement
DE10214447A1 (de) * 2002-03-30 2003-10-16 Hella Kg Hueck & Co Regeleinrichtung zum Regeln von elektrischen Leuchtmitteln und Scheinwerfer mit einer solchen Regeleinrichtung
DE102005039792A1 (de) * 2005-08-22 2007-03-01 Elwa Klaus Warzog Gmbh Beleuchtungsvorrichtung
DE102013102312B3 (de) * 2013-03-08 2014-07-03 Vossloh-Schwabe Deutschland Gmbh Betriebsschaltung zum Betreiben eines Leuchtmoduls
DE102018108412A1 (de) * 2018-04-10 2019-10-10 Siteco Beleuchtungstechnik Gmbh Temperaturüberwachtes led-modul

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9002812U1 (de) * 1990-02-13 1990-06-07 Siemens AG, 1000 Berlin und 8000 München Infrarot-Scheinwerfer
WO1998016942A1 (fr) * 1996-10-11 1998-04-23 Catalina Lighting, Inc. Lampadaire halogene avec protection contre l'incendie
DE19728763A1 (de) * 1997-07-07 1999-01-14 Reitter & Schefenacker Gmbh Schaltungseinrichtung zum Schutz von strombetriebenen Leuchtmitteln, insbesondere von LEDs, zu Signal- oder Beleuchtungszwecken
DE19805771A1 (de) * 1998-02-13 1999-08-19 Hohe Gmbh & Co Kg Beleuchtungseinrichtung für Kraftfahrzeuge

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8006555U1 (de) * 1981-02-05 Semikron Gesellschaft Fuer Gleichrichterbau Und Elektronik Mbh, 8500 Nuernberg Halbleiteranordnung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9002812U1 (de) * 1990-02-13 1990-06-07 Siemens AG, 1000 Berlin und 8000 München Infrarot-Scheinwerfer
WO1998016942A1 (fr) * 1996-10-11 1998-04-23 Catalina Lighting, Inc. Lampadaire halogene avec protection contre l'incendie
DE19728763A1 (de) * 1997-07-07 1999-01-14 Reitter & Schefenacker Gmbh Schaltungseinrichtung zum Schutz von strombetriebenen Leuchtmitteln, insbesondere von LEDs, zu Signal- oder Beleuchtungszwecken
DE19805771A1 (de) * 1998-02-13 1999-08-19 Hohe Gmbh & Co Kg Beleuchtungseinrichtung für Kraftfahrzeuge

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1313353A1 (fr) * 2001-11-19 2003-05-21 Nokia Corporation Procédé et dispositif pour commander une diode LED
WO2004002198A1 (fr) * 2002-06-25 2003-12-31 Koninklijke Philips Electronics N.V. Systeme destine a conserver les caracteristiques lumineuses d'un boitier multipuce a diode electroluminescente (del)
EP2066149A3 (fr) * 2007-11-27 2009-08-19 Stefan Ruppel Lampe plate DEL dotée d'une platine dissipant la chaleur, notamment pour meuble
WO2011104262A1 (fr) * 2010-02-23 2011-09-01 Tridonic Ag Protection de led contre une surchauffe et un courant traversant trop élevé
WO2013160400A1 (fr) * 2012-04-26 2013-10-31 Zumtobel Lighting Gmbh Ensemble de led

Also Published As

Publication number Publication date
EP1083774A3 (fr) 2002-01-30
DE19943345A1 (de) 2001-03-15

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