WO2006066532A1 - Lighting device comprising at least one light-emitting diode and vehicle headlight - Google Patents

Lighting device comprising at least one light-emitting diode and vehicle headlight Download PDF

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Publication number
WO2006066532A1
WO2006066532A1 PCT/DE2005/002172 DE2005002172W WO2006066532A1 WO 2006066532 A1 WO2006066532 A1 WO 2006066532A1 DE 2005002172 W DE2005002172 W DE 2005002172W WO 2006066532 A1 WO2006066532 A1 WO 2006066532A1
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WO
WIPO (PCT)
Prior art keywords
light
emitting diode
cooling
lighting device
heat sink
Prior art date
Application number
PCT/DE2005/002172
Other languages
German (de)
French (fr)
Inventor
Gerhard Behr
Peter Helbig
Thomas Reiners
Ralf Vollmer
Original Assignee
Patent-Treuhand- Gesellschaft Für Elektrische Glühlampen Mbh
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
Priority claimed from DE102004062988A external-priority patent/DE102004062988A1/en
Priority claimed from DE102005005753A external-priority patent/DE102005005753A1/en
Application filed by Patent-Treuhand- Gesellschaft Für Elektrische Glühlampen Mbh filed Critical Patent-Treuhand- Gesellschaft Für Elektrische Glühlampen Mbh
Publication of WO2006066532A1 publication Critical patent/WO2006066532A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/56—Cooling arrangements using liquid coolants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/42—Forced cooling
    • F21S45/46—Forced cooling using liquid
    • F21S45/465—Forced cooling using liquid from other vehicle cooling systems, e.g. from air-conditioning or engine cooling systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
    • F21S45/48—Passive cooling, e.g. using fins, thermal conductive elements or openings with means for conducting heat from the inside to the outside of the lighting devices, e.g. with fins on the outer surface of the lighting device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/51—Cooling arrangements using condensation or evaporation of a fluid, e.g. heat pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/54—Cooling arrangements using thermoelectric means, e.g. Peltier elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/22—Liquid cooling characterised by evaporation and condensation of coolant in closed cycles; characterised by the coolant reaching higher temperatures than normal atmospheric boiling-point
    • F01P2003/2278—Heat pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2050/00—Applications
    • F01P2050/30—Circuit boards
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/42—Forced cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/42—Forced cooling
    • F21S45/43—Forced cooling using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S362/00—Illumination
    • Y10S362/80—Light emitting diode

Definitions

  • Lighting device with at least one light emitting diode and vehicle headlights
  • the invention relates to a lighting device according to the preamble of patent claim 1.
  • Such a lighting device is disclosed for example in EP-A 1 298 382.
  • This document describes a lighting device with a plurality of light emitting diodes, which are arranged on a heat sink, and an optic and an electrical module for operating the light emitting diodes.
  • This lighting device is intended for use in a vehicle and as a replacement for a conventional light bulb.
  • the illumination device has at least one light-emitting diode and a heat sink for the at least one light-emitting diode, wherein the heat sink is provided with connections for a coolant flow through the heat sink.
  • the illumination device has at least one Peltier element for cooling the at least one light-emitting diode
  • the illumination device comprises at least one heat-pipe element for cooling the at least one light emitting diode. This achieves better cooling than by means of a metal plate as disclosed in the prior art.
  • lighting devices intended for use in vehicle headlights must be equipped with light-emitting diodes of particularly high power and light intensity in order to meet the requirements for the different lighting functions, such as low beam, high beam, daytime running light, etc.
  • the corresponding amount of heat that must be dissipated in order to avoid destruction of the LEDs by overheating is carried out according to the invention by means of a coolant flow through the heat sink or by means of at least one Peltier element or by means of at least one heat pipe element. This can be dispensed with large-volume, massive heatsink, which may be provided with cooling fins.
  • the illumination device according to the invention thereby has small dimensions, so that a plurality of lighting devices according to the invention can be arranged in a vehicle headlight to produce by switching the lighting devices in different combinations, the light distribution of the desired illumination function, such as those for the low beam, high beam or daytime running lights.
  • Suitable coolants are both gaseous and liquid coolants. However, preference is given to coolants which are already present in the vehicle for cooling other systems.
  • a cooling water circuit similar to the engine cooling, or a coolant circuit, similar to the air conditioning system may be provided.
  • a meander-shaped coolant guide may be provided inside the heat sink in order to ensure optimum cooling.
  • the at least one light-emitting diode is thermally coupled to the cold during operation surface of the at least one Peltier element.
  • the thermal coupling can be realized, for example, by means of an aluminum plate on which the at least one light-emitting diode is arranged and which is mounted on the Peltier element in contact with its cooled surface.
  • FIG. 1 Schematic representation of the illumination device according to the first exemplary embodiment of the invention
  • FIG. 2 Schematic representation of the illumination device according to the second embodiment of the invention
  • FIG. 3 Schematic representation of the illumination device according to the third embodiment of the invention
  • FIG. 1 shows the illumination device according to the first exemplary embodiment of the invention.
  • This lighting device has a substantially cuboid heat sink 1 with a mounting surface 10, on which a five light-emitting diode chips and with a surrounding the light-emitting diode chips Vergusswanne 3 stocked carrier plate 2 is arranged.
  • the carrier plate 2 is designed as a metallkernplatine which is provided with an electrical insulation made of ceramic and arranged thereon tracks for powering the LED chips.
  • the support plate 2 is mounted on the mounting surface 10 of the metallic heat sink 1 by means of at least one bore and a pin matched thereto.
  • electrical contacts 11 and tracks 12 are applied, which serve to power the LEDs or optionally applied to the tracks 12 electrical components.
  • the illumination device furthermore has an optical element 4, a so-called primary optic, which is fixed on the mounting surface 10 of the heat sink 1 by means of at least one bore and a pin 41 integrally formed on the optical element 4 and matched to the bore in the heat sink 1.
  • the optical element 4 is an optical concentrator, for example a composite parabolic optical concentrator (CPC), which serves to reduce the divergence of the light emitted by the light-emitting diodes.
  • the optical element 4 is arranged above the potting trough 3 and the light-emitting diode chips and is optically coupled to the light-emitting diodes, for example by means of Canada balsam.
  • the light exits from the end face 42 of the optical element 4.
  • the optical element 4 and the support plate 2 are adjusted to each other on the heat sink 1.
  • the heat sink 1 is provided with two connections 13, 14 for the passage of a liquid coolant, for example water, through the interior of the hollow heat sink 1.
  • a Peltier element 5 may be provided which is formed as part of the support body 17 for the LEDs and their optics 4 or thermally to the support body 17 and is coupled to the light emitting diodes or to the support plate 2 for the LEDs.
  • 2 shows a second embodiment of the illumination device according to the invention is shown, which has a cooling means of a Peltier element 5 instead of the coolant flow.
  • the carrier body 17 occurs in the second embodiment in place of the heat sink 1 in the first embodiment. In all other details, this embodiment is the same as the first one. Therefore, the same reference numerals have been used in Figures 1 and 2 for identical parts.
  • the Peltier element 5 operates as a heat pump and therefore transports heat so that it forms a cold and a warm side during operation, by supplying electrical energy.
  • the support plate 2 for the light-emitting diode chips is, for example, directly in contact with the cold side of the Peltier element 5, while the warm side of the Peltier element 5 is coupled, for example, to a metallic heat sink in order to dissipate the heat via cooling fins 15.
  • a metallic heat sink can between the support plate 2 for the LED chips and the cold side of the Peltier element additionally be arranged a metal plate.
  • Commercially available Peltier elements 5 can be used for this type of cooling.
  • the power supply of the at least one Peltier element 5 works by means of the terminals 16 via the vehicle electrical system voltage of the motor vehicle.
  • the carrier body 17 may have recesses for the electrical components of a driver circuit for operating the LEDs, so that the driver circuit is also cooled by the at least one Peltier element 5.
  • the top 10 of the carrier body 17 has the same structure as the O- overside of the heat sink 1 of the first embodiment.
  • the cooling of the illumination device according to the invention can also be carried out by means of at least one commercially available heat-pipe element 6, which is designed, for example, as a component of a heat sink or carrier body for the light-emitting diodes.
  • 3 shows a third embodiment of the illumination device according to the invention is shown, which has a cooling means of a heat pipe element 6 instead of the coolant flow. In all other details, this embodiment is the same as the first one. Therefore, the same reference numerals have been used in Figures 1 and 3 for identical parts.
  • a heat-pipe element 6 has closed tubes which are evacuated, provided with a capillary structure and filled with a two-phase fluid, for example with water and water vapor.
  • the supplied energy is used to evaporate liquid.
  • Steam flows along the heat pipe 6a, 6b and condenses at the end at its cold surfaces 18.
  • the condensed liquid flows back to the heat source under the influence of gravity and capillary force.
  • the energy level of the liquid molecules is increased or decreased by the evaporation enthalpy.
  • no temperature drop since liquid and vapor phase in the two-phase region at the saturation temperature coexist.
  • the saturation temperature is again a function of the pressure. Since the pressure and the temperature vary only slightly along the heat pipe 6a, 6b, heat pipe elements comprising one or more heat pipes 6a, 6b can be used for efficient cooling.
  • One end of the two heat pipes 6a, 6b is in each case thermally coupled to the carrier plate 2 of the light emitting diodes or to the carrier body 1 'for the light emitting diodes and the optical system 4.
  • the upper side 10 of the carrier body 1 ' coincides with that of the heat sink 1 of the first embodiment.
  • the carrier body 1 ' consists of a material of high thermal conductivity.
  • the other end of the two heat pipes 6a, 6b is in each case thermally coupled to the metallic cooling ribs 18, which are cooled by means of a fan 19 arranged behind the cooling ribs 18 (only the fan casing is visible in FIG. 3).
  • a driver circuit for operating the light-emitting diodes which is arranged on the mounting board driver circuit can be also thermally coupled to the heat pipe member 6 v to conduct the generated heat from the drive circuit to the cooling fins 18th

Abstract

The invention relates to a lighting device comprising at least one light-emitting diode and a cooling aggregate (1) for cooling the at least one light-emitting diode, wherein the cooling aggregate (1) is provided either with connections (13, 14) for a coolant to flow through the cooling aggregate (1) or the lighting device comprises at least one Peltier element or at least one heat pipe element for cooling the at least one light-emitting diode.

Description

Beleuchtungseinrichtung mit mindestens einer Leuchtdiode und FahrzeugscheinwerferLighting device with at least one light emitting diode and vehicle headlights
Die Erfindung betrifft eine Beleuchtungseinrichtung gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a lighting device according to the preamble of patent claim 1.
I. Stand der TechnikI. State of the art
Eine derartige Beleuchtungseinrichtung ist beispielsweise in der EP-A 1 298 382 offenbart. Diese Schrift beschreibt eine Beleuchtungseinrichtung mit mehreren Leuchtdioden, die auf einem Kühlkörper angeordnet sind, und einer Optik sowie einem elektrischen Modul zum Betreiben der Leuchtdioden. Diese Beleuchtungseinrichtung ist zum Einsatz in einem Fahrzeug und als Ersatz für eine herkömmliche Glühlampe vorgesehen.Such a lighting device is disclosed for example in EP-A 1 298 382. This document describes a lighting device with a plurality of light emitting diodes, which are arranged on a heat sink, and an optic and an electrical module for operating the light emitting diodes. This lighting device is intended for use in a vehicle and as a replacement for a conventional light bulb.
II. Darstellung der ErfindungII. Presentation of the invention
Es ist Aufgabe der Erfindung, eine gattungsgemäße Beleübhtungseinrichtung mit einer verbesserten Kühlung bereitzustellen.It is an object of the invention to provide a generic Beleübhtungseinrichtung with improved cooling.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruchs 1 gelöst. Besonders vorteilhafte Ausführungen der Erfindung sind in den abhängigen Patentansprüchen beschrieben.This object is achieved by the features of claim 1. Particularly advantageous embodiments of the invention are described in the dependent claims.
Die erfindungsgemäße Beleuchtungseinrichtung weist mindestens eine Leuchtdiode und einen Kühlkörper für die mindestens eine Leuchtdiode auf, wobei der Kühlkörper mit Anschlüssen für einen Kühlmittelfluss durch den Kühlkörper versehen ist. Gemäß einer alternativen zweiten Ausführungsform der Erfindung weist die Beleuchtungseinrichtung mindestens ein Peltier-Element zur Kühlung der mindestens einen Leuchtdiode auf und gemäß einer alternativen dritten Ausführungsform der Erfindung umfasst die Beleuchtungseinrichtung mindestens ein Heat-Pipe-Element zur Kühlung der mindestens einen Leuchtdiode. Dadurch wird eine bessere Kühlung als mittels einer Metallplatte, wie im Stand der Technik offenbart, erreicht. Insbesondere Beleuchtungseinrichtungen, die zur Verwendung in Fahrzeugscheinwerfern vorgesehen sind, müssen mit Leuchtdioden besonders hoher Leistung und Lichtstär- ke bestückt sein, um den Anforderungen für die unterschiedlichen Beleuchtungsfunktionen, wie zum Beispiel Abblendlicht, Fernlicht, Tagfahrlicht etc., zu genügen. Während des Betriebs dieser Leuchtdioden entsteht dem entsprechend viel Wärme, die abgeführt werden muss, um eine Zerstörung der Leuchtdioden durch Überhitzung zu vermeiden. Die Kühlung der Leuchtdioden erfolgt erfindungsgemäß mit Hilfe eines Kühlmittelflusses durch den Kühlkörper oder mittels mindestens eines Peltier- Elementes oder mittels mindestens eines Heat-Pipe-Elementes. Dadurch kann auf großvolumige, massive Kühlkörper, die gegebenenfalls mit Kühlrippen versehen sind, verzichtet werden. Außerdem besitzt die erfindungsgemäße Beleuchtungseinrichtung dadurch geringe Abmessungen, so dass mehrere der erfindungsgemäßen Beleuchtungseinrichtungen in einem Fahrzeugscheinwerfer angeordnet werden können, um durch Einschalten der Beleuchtungseinrichtungen in unterschiedlichen Kombinationen die Lichtverteilung der gewünschten Beleuchtungsfunktion, beispielsweise die für das Abblendlicht, Fernlicht oder Tagfahrlicht, zu erzeugen.The illumination device according to the invention has at least one light-emitting diode and a heat sink for the at least one light-emitting diode, wherein the heat sink is provided with connections for a coolant flow through the heat sink. According to an alternative second embodiment of the invention, the illumination device has at least one Peltier element for cooling the at least one light-emitting diode, and according to an alternative third embodiment of the invention, the illumination device comprises at least one heat-pipe element for cooling the at least one light emitting diode. This achieves better cooling than by means of a metal plate as disclosed in the prior art. In particular, lighting devices intended for use in vehicle headlights must be equipped with light-emitting diodes of particularly high power and light intensity in order to meet the requirements for the different lighting functions, such as low beam, high beam, daytime running light, etc. During the operation of these LEDs, the corresponding amount of heat that must be dissipated in order to avoid destruction of the LEDs by overheating. The cooling of the LEDs is carried out according to the invention by means of a coolant flow through the heat sink or by means of at least one Peltier element or by means of at least one heat pipe element. This can be dispensed with large-volume, massive heatsink, which may be provided with cooling fins. In addition, the illumination device according to the invention thereby has small dimensions, so that a plurality of lighting devices according to the invention can be arranged in a vehicle headlight to produce by switching the lighting devices in different combinations, the light distribution of the desired illumination function, such as those for the low beam, high beam or daytime running lights.
Als Kühlmittel eignen sich sowohl gasförmige als auch flüssige Kühlmittel. Bevor- zugt werden allerdings Kühlmittel, die im Fahrzeug schon zur Kühlung anderer Systeme vorhanden sind. Zur Kühlung der erfindungsgemäßen Beleuchtungseinrichtung kann beispielsweise ein Kühlwasserkreislauf, ähnlich wie bei der Motorkühlung, oder ein Kühlmittelkreislauf, ähnlich wie bei der Klimaanlage, vorgesehen sein. Im Inneren des Kühlkörpers kann ferner eine mäanderförmige Kühlmittelführung vorge- sehen sein, um eine optimale Kühlung zu gewährleisten. Bei der alternativen zweiten Ausführungsform der Erfindung ist die mindestens eine Leuchtdiode thermisch an die während des Betriebs kalte Oberfläche des mindestens einen Peltier-Elementes gekoppelt. Die thermische Kopplung kann beispielsweise mittels einer Aluminiumplatte realisiert werden, auf der die mindestens eine Leuchtdiode angeordnet ist und die auf dem Peltier-Element, im Kontakt mit dessen gekühlter Oberfläche, montiert ist. III. Beschreibung des bevorzugten AusfuhrungsbeispielsSuitable coolants are both gaseous and liquid coolants. However, preference is given to coolants which are already present in the vehicle for cooling other systems. For cooling the illumination device according to the invention, for example, a cooling water circuit, similar to the engine cooling, or a coolant circuit, similar to the air conditioning system may be provided. Furthermore, a meander-shaped coolant guide may be provided inside the heat sink in order to ensure optimum cooling. In the alternative second embodiment of the invention, the at least one light-emitting diode is thermally coupled to the cold during operation surface of the at least one Peltier element. The thermal coupling can be realized, for example, by means of an aluminum plate on which the at least one light-emitting diode is arranged and which is mounted on the Peltier element in contact with its cooled surface. III. Description of the preferred embodiment
Nachstehend wird die Erfindung anhand mehrerer bevorzugter Ausfuhrungsbeispiels näher erläutert.The invention will be explained in more detail with reference to several preferred exemplary embodiment.
Figur 1 Schematische Darstellung der Beleuchtungseinrichtung gemäß dem ersten Ausfuhrungsbeispiel der ErfindungFigure 1 Schematic representation of the illumination device according to the first exemplary embodiment of the invention
Figur 2 Schematische Darstellung der Beleuchtungseinrichtung gemäß dem zweiten Ausführungsbeispiel der ErfindungFigure 2 Schematic representation of the illumination device according to the second embodiment of the invention
Figur 3 Schematische Darstellung der Beleuchtungseinrichtung gemäß dem dritten Ausführungsbeispiel der ErfindungFigure 3 Schematic representation of the illumination device according to the third embodiment of the invention
In der Figur 1 ist die Beleuchtungseinrichtung gemäß dem ersten Ausführungsbeispiel der Erfindung dargestellt. Diese Beleuchtungseinrichtung besitzt einen im wesentlichen quaderförmigen Kühlkörper 1 mit einer Montage fläche 10, auf der eine mit fünf Leuchtdiodenchips und mit einer die Leuchtdiodenchips umgebenden Vergusswanne 3 bestückte Trägerplatte 2 angeordnet ist. Die Trägerplatte 2 ist als Me- tallkernplatine ausgebildet, die mit einer elektrischen Isolierung aus Keramik und darauf angeordneten Leiterbahnen zur Stromversorgung der Leuchtdiodenchips versehen ist. Die Trägerplatte 2 ist mittels mindestens einer Bohrung und eines passgerecht darauf abgestimmten Stiftes auf der Montagefläche 10 des metallischen Kühlkörpers 1 montiert. Die von der Vergusswanne 3 umgebenen fünf Leuchtdiodenchips bilden zusammen mit der in der Vergusswanne angeordneten, Leuchtstoffe enthaltenden Vergussmasse insgesamt fünf Leuchtdioden, die während des Betriebs weißes Licht emittieren. Auf der Montagefläche 10 des Kühlkörpers 1 sind, vom Kühlkörper 1 durch eine elektrisch isolierende Sperrschicht getrennt, elektrische Kontakte 11 und Leiterbahnen 12 aufgebracht, die zur Stromversorgung der Leuchtdioden bzw. der gegebenenfalls auf den Leiterbahnen 12 aufgebrachten elektrischen Bauteile dienen. Die Beleuchtungseinrichtung weist außerdem ein optisches Element 4, eine so genannte Primäroptik, auf, die mittels mindestens einer Bohrung und eines an das optische Element 4 angeformten, auf die Bohrung im Kühlkörper 1 passgerecht abgestimmten Stiftes 41 auf der Montagefläche 10 des Kühlkörpers 1 fixiert ist. Bei dem optischen Element 4 handelt es sich um einen optischen Konzentrator, beispielsweise einen zusammengesetzten parabolischen optischen Konzentrator (Compound Parabo- Hc Concentrator, CPC), der zur Verringerung der Divergenz des von den Leuchtdioden emittierten Lichts dient. Das optische Element 4 ist über der Vergusswanne 3 und den Leuchtdiodenchips angeordnet und beispielsweise mittels Kanadabalsam optisch an die Leuchtdioden gekoppelt. Das Licht tritt aus der Stirnfläche 42 des optischen Elementes 4 aus. Mittels der vorgenannten Bohrungen und Passstifte sind das optische Element 4 und die Trägerplatte 2 auf dem Kühlkörper 1 zueinander justiert. Zur Höhenjustierung des optischen Elements 4 über den Leuchtdioden dient ein An- schlagszapfen 43, der als Bestandteil des optischen Elements 4 ausgebildet ist und auf der Trägerplatte 2 aufsitzt. Der Kühlkörper 1 ist mit zwei Anschlüssen 13, 14 zum Durchleiteή eines flüssigen Kühlmittels, beispielsweise Wasser, durch das Innere des hohlen Kühlkörpers 1 ausgestattet.FIG. 1 shows the illumination device according to the first exemplary embodiment of the invention. This lighting device has a substantially cuboid heat sink 1 with a mounting surface 10, on which a five light-emitting diode chips and with a surrounding the light-emitting diode chips Vergusswanne 3 stocked carrier plate 2 is arranged. The carrier plate 2 is designed as a metallkernplatine which is provided with an electrical insulation made of ceramic and arranged thereon tracks for powering the LED chips. The support plate 2 is mounted on the mounting surface 10 of the metallic heat sink 1 by means of at least one bore and a pin matched thereto. The five light-emitting diode chips surrounded by the potting trough 3 together with the potting compound containing luminescent materials contained in the potting trough form a total of five light-emitting diodes which emit white light during operation. On the mounting surface 10 of the heat sink 1, separated from the heat sink 1 by an electrically insulating barrier layer, electrical contacts 11 and tracks 12 are applied, which serve to power the LEDs or optionally applied to the tracks 12 electrical components. The illumination device furthermore has an optical element 4, a so-called primary optic, which is fixed on the mounting surface 10 of the heat sink 1 by means of at least one bore and a pin 41 integrally formed on the optical element 4 and matched to the bore in the heat sink 1. In which The optical element 4 is an optical concentrator, for example a composite parabolic optical concentrator (CPC), which serves to reduce the divergence of the light emitted by the light-emitting diodes. The optical element 4 is arranged above the potting trough 3 and the light-emitting diode chips and is optically coupled to the light-emitting diodes, for example by means of Canada balsam. The light exits from the end face 42 of the optical element 4. By means of the aforementioned holes and dowel pins, the optical element 4 and the support plate 2 are adjusted to each other on the heat sink 1. For height adjustment of the optical element 4 via the light emitting diodes serves a stop pin 43, which is formed as part of the optical element 4 and is seated on the support plate 2. The heat sink 1 is provided with two connections 13, 14 for the passage of a liquid coolant, for example water, through the interior of the hollow heat sink 1.
Anstelle der Kühlung mittels eines Kühlmittelflusses durch den Kühlkörper 1 kann auch, gemäß dem Ausführungsbeispiel in Figur 2, ein Peltier-Element 5 vorgesehen sein, das als Bestandteil des Trägerkörpers 17 für die Leuchtdioden und ihre Optik 4 ausgebildet ist oder thermisch an den Trägerkörper 17 und an die Leuchtdioden bzw. an die Trägerplatte 2 für die Leuchtdioden gekoppelt ist. In der Figur 2 ist ein zweites Ausführungsbeispiel der erfindungsgemäßen Beleuchtungseinrichtung dargestellt, die anstelle des Kühlmittelflusses eine Kühlung mittels eines Peltierelementes 5 besitzt. Der Trägerkörper 17 tritt bei dem zweiten Ausführungsbeispiel an die Stelle des Kühlkörpers 1 bei dem ersten Ausführungsbeispiel. In allen anderen Details stimmt dieses Ausführungsbeispiel mit dem ersten überein. Daher wurden in den Figuren 1 und 2 für identische Teile dieselben Bezugszeichen verwendet. Das Peltier-Element 5 arbeitet als Wärmepumpe und transportiert daher Wärme, so dass es während des Betriebs, durch Zufuhr von elektrischer Energie, eine kalte und eine warme Seite ausbildet. Die Trägerplatte 2 für die Leuchtdiodenchips befindet sich beispielsweise direkt im Kontakt mit der kalten Seite des Peltier-EIementes 5, während die warme Seite des Peltier-EIementes 5 beispielsweise an einen metallischen Kühlkörper ge- koppelt ist, um die Wärme über Kühlrippen 15 abzuführen. Um die Kühlwirkung bzw. thermische Kopplung zu verbessern, kann zwischen der Trägerplatte 2 für die Leuchtdiodenchips und der kalten Seite des Peltier-Elementes zusätzlich eine Metallplatte angeordnet sein. Für diese Art der Kühlung können handelsübliche Peltier- Elemente 5 verwendet werden. Die Energieversorgung des mindestens einen Peltier- Elementes 5 funktioniert mittels der Anschlüsse 16 über die Bordnetzspannung des Kraftfahrzeugs. Der Trägerkörper 17 kann Aussparungen für die elektrischen Komponenten einer Treiberschaltung zum Betreiben der Leuchtdioden besitzen, so dass die Treiberschaltung ebenfalls durch das mindestens eine Peltier-Element 5 gekühlt wird.. Die Oberseite 10 des Trägerkörpers 17 besitzt denselben Aufbau wie die O- berseite des Kühlkörpers 1 des ersten Ausführungsbeispiels.Instead of cooling by means of a coolant flow through the heat sink 1, according to the embodiment in Figure 2, a Peltier element 5 may be provided which is formed as part of the support body 17 for the LEDs and their optics 4 or thermally to the support body 17 and is coupled to the light emitting diodes or to the support plate 2 for the LEDs. 2 shows a second embodiment of the illumination device according to the invention is shown, which has a cooling means of a Peltier element 5 instead of the coolant flow. The carrier body 17 occurs in the second embodiment in place of the heat sink 1 in the first embodiment. In all other details, this embodiment is the same as the first one. Therefore, the same reference numerals have been used in Figures 1 and 2 for identical parts. The Peltier element 5 operates as a heat pump and therefore transports heat so that it forms a cold and a warm side during operation, by supplying electrical energy. The support plate 2 for the light-emitting diode chips is, for example, directly in contact with the cold side of the Peltier element 5, while the warm side of the Peltier element 5 is coupled, for example, to a metallic heat sink in order to dissipate the heat via cooling fins 15. To improve the cooling effect or thermal coupling, can between the support plate 2 for the LED chips and the cold side of the Peltier element additionally be arranged a metal plate. Commercially available Peltier elements 5 can be used for this type of cooling. The power supply of the at least one Peltier element 5 works by means of the terminals 16 via the vehicle electrical system voltage of the motor vehicle. The carrier body 17 may have recesses for the electrical components of a driver circuit for operating the LEDs, so that the driver circuit is also cooled by the at least one Peltier element 5. The top 10 of the carrier body 17 has the same structure as the O- overside of the heat sink 1 of the first embodiment.
Als weitere Alternative kann die Kühlung der erfindungsgemäßen Beleuchtungseinrichtung auch .mittels mindestens eines handelsüblichen Heat-Pipe-Elementes 6 durchgeführt werden, das beispielsweise als Bestandsteil eines Kühlkörpers oder Trägerkörpers für die Leuchtdioden ausgebildet ist. In der Figur 3 ist ein drittes Ausführungsbeispiel der erfindungsgemäßen Beleuchtungseinrichtung dargestellt, die anstelle des Kühlmittelflusses eine Kühlung mittels eines Heat-Pipe-Elementes 6 besitzt. In allen anderen Details stimmt dieses Ausführungsbeispiel mit dem ersten überein. Daher wurden in den Figuren 1 und 3 für identische Teile dieselben Bezugszeichen verwendet. Ein Heat-Pipe-Element 6 besitzt geschlossene Rohre, die evakuiert, mit einer Kapillarstruktur versehen und mit einem Zwei-Phasen-Fluid, bei- spielsweise mit Wasser und Wasserdampf, befüllt sind. An der Wärmequelle, das heißt, an den Leuchtdiodenchips bzw. an deren Trägerplatte 2, wird die zugeführte Energie zum Verdampfen von Flüssigkeit verwendet. Dampf strömt entlang der Heat-Pipe 6a, 6b und kondensiert am Ende an seinen kalten Flächen 18. Die kondensierte Flüssigkeit fließt unter Schwerkraft- und Kapillarkraft-Einfluß zurück zur Wärmequelle. Beim Verdampfen und Kondensieren wird das Energieniveau der Flüssigkeitsmoleküle um die Verdampfungsenthalpie erhöht bzw. erniedrigt. Dabei entsteht kein Temperaturabfall, da Flüssig- und Dampfphase im Zwei-Phasengebiet bei der Sättigungstemperatur nebeneinander vorliegen. Die Sättigungstemperatur ist wiederum eine Funktion des Druckes. Da der Druck und die Temperatur nur gering- fügig entlang der Heat-Pipe 6a, 6b variieren, lassen sich Heat-Pipe-Elemente, die eine oder mehrere Heat-Pipes 6a, 6b umfassen, für eine effiziente Kühlung einsetzen. Ein Ende der beiden Heat-Pipes 6a, 6b ist jeweils thermisch an die Trägerplatte 2 der Leuchtdioden bzw. an den Trägerkörper 1 ' für die Leuchtdioden und die Optik 4 gekoppelt. Die Oberseite 10 des Trägerkörpers 1' stimmt mit der des Kühlkörpers 1 des ersten Ausführungsbeispiels über. Der Trägerkörper 1 ' besteht aus einem Materi- al hoher Wärmeleitfähigkeit. Das andere Ende der beiden Heat-Pipes 6a, 6b ist jeweils thermisch an die metallischen Kühlrippen 18 gekoppelt, die mittels eines hinter den Kühlrippen 18 angeordneten Ventilators 19 (in Figur 3 ist nur das Ventilatorgehäuse sichtbar) gekühlt werden. In einer Aussparung oder einem Innenraum des Trägerkörpers 1 ' kann, beispielsweise auf einer Montageplatine, eine Treiberschaltung zum Betreiben der Leuchtdioden angeordnet sein. Die auf der Montageplatine angeordnete Treiberschaltung kann ebenfalls thermisch an das Heat-Pipe-Element 6 gekoppelt sein, umvdie von der Treiberschaltung generierte Wärme zu den Kühlrippen 18 zu leiten. As a further alternative, the cooling of the illumination device according to the invention can also be carried out by means of at least one commercially available heat-pipe element 6, which is designed, for example, as a component of a heat sink or carrier body for the light-emitting diodes. 3 shows a third embodiment of the illumination device according to the invention is shown, which has a cooling means of a heat pipe element 6 instead of the coolant flow. In all other details, this embodiment is the same as the first one. Therefore, the same reference numerals have been used in Figures 1 and 3 for identical parts. A heat-pipe element 6 has closed tubes which are evacuated, provided with a capillary structure and filled with a two-phase fluid, for example with water and water vapor. At the heat source, that is, at the LED chips or at the support plate 2, the supplied energy is used to evaporate liquid. Steam flows along the heat pipe 6a, 6b and condenses at the end at its cold surfaces 18. The condensed liquid flows back to the heat source under the influence of gravity and capillary force. During evaporation and condensation, the energy level of the liquid molecules is increased or decreased by the evaporation enthalpy. In this case, no temperature drop, since liquid and vapor phase in the two-phase region at the saturation temperature coexist. The saturation temperature is again a function of the pressure. Since the pressure and the temperature vary only slightly along the heat pipe 6a, 6b, heat pipe elements comprising one or more heat pipes 6a, 6b can be used for efficient cooling. One end of the two heat pipes 6a, 6b is in each case thermally coupled to the carrier plate 2 of the light emitting diodes or to the carrier body 1 'for the light emitting diodes and the optical system 4. The upper side 10 of the carrier body 1 'coincides with that of the heat sink 1 of the first embodiment. The carrier body 1 'consists of a material of high thermal conductivity. The other end of the two heat pipes 6a, 6b is in each case thermally coupled to the metallic cooling ribs 18, which are cooled by means of a fan 19 arranged behind the cooling ribs 18 (only the fan casing is visible in FIG. 3). In a recess or an inner space of the carrier body 1 'can be arranged, for example on a mounting board, a driver circuit for operating the light-emitting diodes. Which is arranged on the mounting board driver circuit can be also thermally coupled to the heat pipe member 6 v to conduct the generated heat from the drive circuit to the cooling fins 18th

Claims

Patentansprüche claims
1. Beleuchtungseinrichtung mit mindestens einer Leuchtdiode und einem Kühlkörper (1) zur Kühlung der mindestens einen Leuchtdiode, dadurch gekennzeichnet, dass der Kühlkörper (1) mit Anschlüssen (13, 14) für einen Kühl- mittelfluss durch den Kühlkörper (1) versehen ist.1. Lighting device with at least one light emitting diode and a heat sink (1) for cooling the at least one light emitting diode, characterized in that the heat sink (1) with terminals (13, 14) for a coolant flow through the heat sink (1) is provided.
2. Beleuchtungseinrichtung mit mindestens einer Leuchtdiode, dadurch gekennzeichnet, dass die Beleuchtungseinrichtung mindestens ein Peltier-Element (5) zur.Kühlung der mindestens einen Leuchtdiode umfasst.2. Lighting device with at least one light emitting diode, characterized in that the illumination device comprises at least one Peltier element (5) zur.Kühlung the at least one light emitting diode.
3. Beleuchtungseinrichtung mit mindestens einer Leuchtdiode, dadurch gekennzeichnet, dass die Beleuchtungseinrichtung mindestens ein Heat-Pipe- Element (6) zur Kühlung der mindestens einen Leuchtdiode umfasst.3. Lighting device with at least one light emitting diode, characterized in that the illumination device comprises at least one heat pipe element (6) for cooling the at least one light emitting diode.
4. Fahrzeugscheinwerfer mit mindestens einer Beleuchtungseinrichtung gemäß Anspruch 1, 2 oder 3.4. Vehicle headlight with at least one illumination device according to claim 1, 2 or 3.
5. Fahrzeugscheinwerfer nach Anspruch 4, dadurch gekennzeichnet, dass die Anschlüsse (13, 14) für den Kühlmittelfluss der mindestens einen Beleuch- tungseinrichtung an einen Kühlkreislauf des Fahrzeugs angeschlossen sind. 5. Vehicle headlight according to claim 4, characterized in that the connections (13, 14) for the coolant flow of the at least one lighting device are connected to a cooling circuit of the vehicle.
PCT/DE2005/002172 2004-12-22 2005-12-01 Lighting device comprising at least one light-emitting diode and vehicle headlight WO2006066532A1 (en)

Applications Claiming Priority (4)

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DE102004062988A DE102004062988A1 (en) 2004-12-22 2004-12-22 Lighting device for headlamp of vehicle, has light emitting diode and cooling unit e.g. Peltier unit, cooling diode, where unit is provided with connectors or heat pipe unit for liquid coolant e.g. water, to flow through cooling unit
DE102004062988.9 2004-12-22
DE102005005753A DE102005005753A1 (en) 2005-02-07 2005-02-07 Lighting device for headlamp of vehicle, has light emitting diode and cooling unit e.g. Peltier unit, cooling diode, where unit is provided with connectors or heat pipe unit for liquid coolant e.g. water, to flow through cooling unit
DE102005005753.5 2005-02-07

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