EP2229555B1 - Arrangement for cooling semiconductor light sources and floodlight having this arrangement - Google Patents

Arrangement for cooling semiconductor light sources and floodlight having this arrangement Download PDF

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Publication number
EP2229555B1
EP2229555B1 EP08707877A EP08707877A EP2229555B1 EP 2229555 B1 EP2229555 B1 EP 2229555B1 EP 08707877 A EP08707877 A EP 08707877A EP 08707877 A EP08707877 A EP 08707877A EP 2229555 B1 EP2229555 B1 EP 2229555B1
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EP
European Patent Office
Prior art keywords
condensation zone
heat
arrangement according
condensation
semiconductor light
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EP08707877A
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German (de)
French (fr)
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EP2229555A1 (en
Inventor
Alois Biebl
Stefan Dietz
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Osram GmbH
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Osram GmbH
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Classifications

    • 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
    • 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
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • 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
    • 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
    • F21S45/60—Heating of lighting devices, e.g. for demisting
    • 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
    • F21V29/71—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
    • F21V29/717—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements using split or remote units thermally interconnected, e.g. by thermally conductive bars or heat pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • 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]

Definitions

  • the invention relates to an arrangement for cooling semiconductor light sources, wherein the semiconductor light sources are arranged on a thermally conductive module, which is in operative connection with an evaporator zone of a heat pipe, and a first condensation zone of the heat pipe is connected to a first heat sink.
  • the arrangement is suitable for example for headlights of all kinds, but especially for headlights in the automotive sector.
  • a tubular device As a heat pipe, a tubular device is referred to below, which can transport large amounts of heat energy between its two ends by evaporation / condensation of a working fluid.
  • a cooling system for automotive lighting arrangements which cools the semiconductor light sources by means of a heat pipe with a heat sink remote from the semiconductor light sources.
  • the W02006 / 52022 A1 discloses a motor vehicle headlamp with semiconductor light sources cooled by a heat pipe.
  • the heat sink is placed here above the semiconductor light sources on the back of the headlight.
  • EP 1 643 188 an arrangement for cooling of semiconductor light sources is known, wherein the semiconductor light sources are arranged on a thermally conductive module, which is in operative connection with an evaporator zone of a heat pipe, wherein a first condensation zone of the heat pipe is connected to a first heat sink and the heat pipe to at least a second condensation zone with at least a second heat sink is connected.
  • the object is achieved with respect to the arrangement by an arrangement for cooling semiconductor light sources, wherein the semiconductor light sources are arranged on a thermally conductive module, which is in operative connection with an evaporator zone of a heat pipe, and a first condensation zone of the evaporator tube is connected to a first heat sink wherein the heat pipe to a second condensation zone with a second heat sink is connected and a heat flow between the condensation zones is switchable.
  • the heat sinks can be used as a controlled heating for other purposes, as can be switched by switching the heat flow at any time to the second heat sink, and thus no restriction in the operation of semiconductor light sources occurs.
  • the second heat sink is designed so that they Waste heat of semiconductor light sources can absorb at any time.
  • the switching of the condensation zones is done with a 3-way valve.
  • the 3-way valve contains a permanent magnetic double cone, wherein the conical tips in each case close the evaporator tube of a condensation zone alternately.
  • a 2-way valve is conceivable in which only one condensation zone is switched on and off. This has the advantage that a first cooling path into a first condensation zone is always open, while a second cooling path can be connected in a second condensation zone if necessary.
  • the double cone closes only the evaporator tube and not the capillary area of the heat pipe.
  • the drive of the double cone is arranged outside the heat pipe and takes place magnetically. Outside the heat pipe there is usually enough space available for the drive, and the magnetic drive does not require any sealing measures.
  • the heat sink (33) of the first condensation zone (23) is preferably in operative connection with a heating device. As a result, the waste heat produced can advantageously be used for another task.
  • the evaporator tube When switching on the semiconductor light sources, the evaporator tube is advantageously open to the first condensation zone and the evaporator tube is closed to the second condensation zone.
  • the switching of the condensation zones is dependent on the temperature of the first condensation zone.
  • the aforementioned heating device can be designed to be regulated, and by means of this priority circuit a defined operation of the arrangement for cooling semiconductor light sources is possible.
  • the power supply of the semiconductor light sources via the heat pipe via the heat pipe.
  • This has the advantage of a simpler and more reliable design.
  • simple and inexpensive tubes can be used as a power supply, wherein the two poles of the power supply are formed by the two coaxial tubes.
  • FIG. 1 A perspective view of a connected to a heat pipe semiconductor light source module with a connected to the heat pipe rosette-shaped heat sink in an embodiment according to the prior art.
  • FIG. 2 A detailed drawing of the cut semiconductor light source module with the illustrated end of the incorporated heat pipe.
  • FIG. 3 A perspective view of the above arrangement incorporated in a lampshade.
  • Fig. 4 A perspective view of an inventive arrangement for cooling semiconductor light sources with two independent heat sinks which are connected to a respective condensation zone, which can be switched between the condensation zones.
  • Fig. 5 A schematic side view of an inventive arrangement for cooling semiconductor light sources.
  • Fig. 6 A detailed perspective view of a switching valve according to the invention.
  • Fig. 1 shows an embodiment of an arrangement for cooling semiconductor light sources according to the prior art with only one condensation zone, which is enclosed by a rosette-shaped heat sink 31, which dissipates the heat of condensation arising.
  • a multi-chip LED 5 (not shown) with an attached primary optics 51 is mounted on a light-emitting diode module 11.
  • the light-emitting diode module 11 is made of a good heat-conducting material in order to dissipate the resulting heat loss of the multi-chip LED 5 quickly and safely.
  • the light-emitting diode module 11 is embedded in a housing 13 which, in addition to the light-emitting diode module 11, also has an electronic control unit 15 for the multichip light-emitting diode 5.
  • the housing 13 is made of a poorly heat-conductive material to minimize the temperature load of the drive electronics 15 through the multi-chip LED 5.
  • a heat pipe 20 leads from the light-emitting diode module 11 to a heat sink 31.
  • Fig. 2 shows a detail section through the light-emitting diode module 11 with the housing 13.
  • the heat pipe 20 is incorporated with its evaporator-side end 27 in the light-emitting diode module 11, and reaches up to the multi-chip LED 5 zoom in order to remove the heat loss as efficiently as possible can.
  • the heat is transported from the heat pipe via the vaporized working medium in the condensation zone and there from the heat sink 31 (In Fig. 2 not shown).
  • Fig. 3 shows the whole arrangement built into a reflector screen 53.
  • the heat sink 31 is mounted centrally on the reflector screen 53. All generated heat is thus discharged to the reflector screen 53 out.
  • Fig. 4 shows a perspective view of an inventive arrangement for cooling semiconductor light sources, which solves the above problem.
  • the arrangement is in this case a motor vehicle headlamp, in which the waste heat of the multi-chip LED 5 is passed through a heat pipe 20 to a condensation zone 23, which is cooled by a heat sink 33 and thus heats the lens 37.
  • the inventive arrangement for cooling semiconductor light sources has two switchable heat sinks 33, 35. The switching is accomplished by means of a temperature-controlled valve in the heat pipe 20.
  • the first heat sink 33 is used as above besc written as heating, for example, the headlight deicing.
  • the temperature control is designed so that primarily this task is solved, this heat sink 33 is thus only as long in operation as here heat energy is needed. If the setpoint temperature is reached, is switched to a second heat sink 35. This is designed to be the to be able to absorb any heat flow at any time and at any time.
  • the second heat sink 35 may be a sufficiently large heat sink. But it is also conceivable that the second heat sink 35 is connected to an existing or to be created for cooling system.
  • the second heat sink 35 may be e.g. be connected to the water cooling of the motor vehicle. But it can also be e.g. a Peltier element may be provided which is connected to the second heat sink 35.
  • the heat pipe 20 has a switching valve 21, by means of which it is possible to switch between two condensation zones 23, 25 with the correspondingly connected heat sinks 33, 35.
  • the first heat sink 33 is formed as a ring around the diffuser 37 of the headlamp 1. This makes it possible to heat the diffuser 37 in bad weather conditions to the extent that an ice crystal formation is reliably prevented.
  • the control of the changeover valve 21 is such that from a certain temperature of the ring is switched to the second condensation zone 25 to the diffusion plate 37 in order to ensure efficient cooling of the multi-chip LED 5 and to prevent overheating of the heat sink 33.
  • the power supply to the multi-chip LEDs 5 is thereby accomplished by the heat pipe itself, which consists of an electrically conductive material such as aluminum or copper. If two of these conductive tubes are arranged coaxially with one another with insulation between them, a cost-effective and robust construction results Power supply for the multi-chip LEDs 5 and arranged on the module 11 electronics.
  • Fig. 5 shows a schematic side view of the inventive arrangement for cooling semiconductor light sources.
  • the switching valve 21 is controlled so that after switching on the multi-chip LED 5, the first condensation zone 23 with the first heat sink 33 is active. If the first heat sink has reached a certain temperature, the changeover valve 21 switches over to the second condensation zone 25 with the second heat sink 35. This is arranged behind the lampshade 53, and is sized in size so that they can absorb the heat energy generated at any time. If the temperature is not reached due to cold weather conditions, the first heat sink 33 remains permanently active in order to prevent ice crystal formation on the diffusing screen 37 as much as possible.
  • Fig. 6 shows a schematic detail drawing of the switching valve 21. It consists of a T-shaped piece of pipe, in which a permanent magnetic double cone is introduced. This consists of two conical parts 411, 412, which are aligned at the base same profile or congruent to each other, so that the conical tips point in opposite directions. Between the two base surfaces can still be a cylindrical portion 413 lie. However, the base surfaces can also be arranged offset from each other (not shown), so that a cylindrical slope arises between the two base surfaces. The base surfaces of the cones 411, 412 may also have an oval or ovate shape have (not shown). Polygons are also possible as a form of the base surface.
  • the cone 411, 412 is then shaped corresponding to the base surface (not shown).
  • This double cone 41 is located in the center of the T-shaped pipe section. At the cut ends, the cross section of the heat pipe 20 is shown.
  • the outer shell consists of a gas-tight tube 47 into which a capillary tube 45 made of a porous material is introduced. Within the capillary tube 45 is the evaporator tube 43. In the region of the double cone, the capillary tube is recessed or at least the wall thickness is formed weaker.
  • the base diameter of the double cone 41 is larger than the diameter of the evaporator tube 43.
  • the tips of the double cone 41 respectively to the first and second condensation zone 23, 25. The cone 41 can penetrate far enough into the evaporator tube 43 until it has completely closed.
  • the capillary tube 45 remains unaffected, so that working fluid flowing back into the evaporator zone 27 can pass. This contributes to an efficient operation of the heat pipe 20.
  • Externally attached to the tee are suitable controlled solenoids (not shown). These can, depending on the control, press the permanent-magnetic double cone 41 into the end of the evaporator tube 43 of the first or the second condensation zone 23, 25 and thus close it. Thus, it is possible to switch between the two cooling paths without affecting the heat flow altogether. Due to the construction as a 3-way valve 21, a heat flow into one of the condensation zones 23, 25 is always ensured.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

An arrangement for cooling semiconductor light sources (5), wherein the semiconductor light sources (5) are arranged on a heat-conducting module (11), which is operatively connected to an evaporator zone (27) of a heat pipe (20), wherein a first condensation zone (23) of the heat pipe (20) is connected to a first heat sink (33), wherein the heat pipe (20) is connected to at least one second condensation zone (25) with at least one second heat sink (25), and a heat flow can be switched over between the condensation zones (23, 25) or the second condensation zone (25) can be switched in.

Description

Anordnung zur Kühlung von Halbleiterlichtquellen und Scheinwerfer mit dieser Anordnung.Arrangement for cooling semiconductor light sources and headlights with this arrangement.

Technisches GebietTechnical area

Die Erfindung betrifft eine Anordnung zur Kühlung von Halbleiterlichtquellen, wobei die Halbleiterlichtquellen auf einem wärmeleitenden Modul angeordnet sind, das mit einer Verdampferzone eines Wärmerohrs in Wirkverbindung steht, und eine erste Kondensationszone des Wärmerohrs mit einer ersten Wärmesenke verbunden ist. Die Anordnung ist beispielsweise für Scheinwerfer aller Art geeignet, insbesondere aber für Scheinwerfer im Kfz-Bereich.The invention relates to an arrangement for cooling semiconductor light sources, wherein the semiconductor light sources are arranged on a thermally conductive module, which is in operative connection with an evaporator zone of a heat pipe, and a first condensation zone of the heat pipe is connected to a first heat sink. The arrangement is suitable for example for headlights of all kinds, but especially for headlights in the automotive sector.

Als Wärmerohr (engl. Heat Pipe) wird im Folgenden eine rohrförmige Vorrichtung bezeichnet, die durch Verdampfen/Kondensieren einer Arbeitsflüssigkeit große Mengen an Wärmeenergie zwischen ihren zwei Enden transportieren kann.As a heat pipe, a tubular device is referred to below, which can transport large amounts of heat energy between its two ends by evaporation / condensation of a working fluid.

Stand der TechnikState of the art

Aus der US2004/213016 A1 ist ein Kühlsystem für automobile Lichtanordnungen bekannt, das die Halbleiterlichtquellen mittels eines Wärmerohrs mit entfernt von den Halbleiterlichtquellen liegender Wärmesenke kühlt.From the US2004 / 213016 A1 For example, a cooling system for automotive lighting arrangements is known, which cools the semiconductor light sources by means of a heat pipe with a heat sink remote from the semiconductor light sources.

Die W02006/52022 A1 offenbart einen Kfz-Scheinwerfer mit Halbleiterlichtquellen, die über ein Wärmerohr gekühlt werden. Die Wärmesenke ist hierbei oberhalb der Halbleiterlichtquellen an der Rückseite des Scheinwerfers platziert.
Aus Dokument EP 1 643 188 ist eine Anordnung zur Kühlung von Halbleiterlichtquellen bekannt, wobei die Halbleiterlichtquellen auf einem wärmeleitenden Modul angeordnet sind, das mit einer Verdampferzone eines Wärmerohrs in Wirkverbindung steht, wobei eine erste Kondensationszone des Wärmerohrs mit einer ersten Wärmesenke verbunden ist und das Wärmerohr an mindestens eine zweite Kondensationszone mit mindestens einer zweiten Wärmesenke angeschlossen ist.The W02006 / 52022 A1 discloses a motor vehicle headlamp with semiconductor light sources cooled by a heat pipe. The heat sink is placed here above the semiconductor light sources on the back of the headlight.
From document EP 1 643 188 an arrangement for cooling of semiconductor light sources is known, wherein the semiconductor light sources are arranged on a thermally conductive module, which is in operative connection with an evaporator zone of a heat pipe, wherein a first condensation zone of the heat pipe is connected to a first heat sink and the heat pipe to at least a second condensation zone with at least a second heat sink is connected.

Es stellt sich jedoch das Problem dar, dass die Abwärme der Halbleiterlichtquellen oftmals an anderer Stelle als Heizwärme gebraucht würde. Da die Heizung aber meistens geregelt sein soll, ist die oben beschriebene Anordnung in so einem Fall nicht brauchbar.However, there is the problem that the waste heat of the semiconductor light sources would often be needed elsewhere than thermal heat. However, since the heater should be mostly regulated, the arrangement described above is not useful in such a case.

Aufgabetask

Es ist Aufgabe der Erfindung, eine Anordnung zur Kühlung von Halbleiterlichtquellen zu schaffen, wobei die Halbleiterlichtquellen auf einem wärmeleitenden Modul angeordnet sind, das mit einer Verdampferzone eines Wärmerohrs in Wirkverbindung steht, und eine erste Kondensationszone des Verdampferrohrs mit einer ersten Wärmesenke verbunden ist, und die Anordnung gleichzeitig die ganze oder einen Teil der Wärmeenergie einer anderen Verwendung zuführen kann.It is an object of the invention to provide an arrangement for cooling of semiconductor light sources, wherein the semiconductor light sources are arranged on a thermally conductive module which is in operative connection with an evaporator zone of a heat pipe, and a first condensation zone of the evaporator tube is connected to a first heat sink, and Arrangement at the same time all or part of the heat energy of another use can perform.

Es ist weiterhin Aufgabe der Erfindung, ein Verfahren zu schaffen, das zur Kühlung von Halbleiterlichtquellen dient und bei dem gleichzeitig die ganze oder ein Teil der Wärmeenergie einer anderen Verwendung zugeführt wird.It is a further object of the invention to provide a method which is used for cooling of semiconductor light sources and in which at the same time all or part of the heat energy is supplied to another use.

Darstellung der ErfindungPresentation of the invention

Die Aufgabe wird bezüglich der Anordnung gelöst durch eine Anordnung zur Kühlung von Halbleiterlichtquellen, wobei die Halbleiterlichtquellen auf einem wärmeleitenden Modul angeordnet sind, das mit einer Verdampferzone eines Wärmerohrs in Wirkverbindung steht, und eine erste Kondensationszone des Verdampferrohrs mit einer ersten Wärmesenke verbunden ist wobei das Wärmerohr an eine zweite Kondensationszone mit einer zweiten Wärmesenke angeschlossen ist und ein Wärmestrom zwischen den Kondensationszonen umschaltbar ist. Damit kann eine der Wärmesenken als geregelte Heizung für andere Zwecke benutzt werden, da durch die Umschaltung der Wärmestrom jederzeit auf die zweite Wärmesenke geschaltet werden kann, und somit keine Einschränkung beim Betrieb der Halbleiterlichtquellen auftritt.Die zweite Wärmesenke ist dabei so ausgelegt, dass sie die Abwärme der Halbleiterlichtquellen jederzeit absorbieren kann.The object is achieved with respect to the arrangement by an arrangement for cooling semiconductor light sources, wherein the semiconductor light sources are arranged on a thermally conductive module, which is in operative connection with an evaporator zone of a heat pipe, and a first condensation zone of the evaporator tube is connected to a first heat sink wherein the heat pipe to a second condensation zone with a second heat sink is connected and a heat flow between the condensation zones is switchable. Thus, one of the heat sinks can be used as a controlled heating for other purposes, as can be switched by switching the heat flow at any time to the second heat sink, and thus no restriction in the operation of semiconductor light sources occurs. The second heat sink is designed so that they Waste heat of semiconductor light sources can absorb at any time.

Die Aufgabe wird weiterhin bezüglich des Verfahrens gelöst durch ein Verfahren mit den Merkmalen des Anspruchs 16.The object is further achieved with respect to the method by a method having the features of claim 16.

Vorteilhafterweise geschieht die Umschaltung der Kondensationszonen mit einem 3-Wege Ventil. Dabei enthält das 3-Wege Ventil einen permanentmagnetischen Doppelkegel, wobei die Kegelspitzen jeweils das Verdampferrohr einer Kondensationszone abwechselnd verschließen. Dies hat den Vorteil, dass immer ein Kühlpfad geöffnet ist und ein Versagen der Halbleiterlichtquellen aufgrund Überhitzung somit ausgeschlossen wird. Durch diese Konstruktion ist ein magnetischer Antrieb des Doppelkegels möglich, der keine Probleme bezüglich der Abdichtung generiert.Advantageously, the switching of the condensation zones is done with a 3-way valve. In this case, the 3-way valve contains a permanent magnetic double cone, wherein the conical tips in each case close the evaporator tube of a condensation zone alternately. This has the advantage that a cooling path is always open and thus failure of the semiconductor light sources due to overheating is precluded. By this construction, a magnetic drive of the double cone is possible, which generates no problems with the seal.

Alternativ ist auch ein 2-Wege Ventil denkbar, bei dem nur eine Kondensationszone Ein- und Ausgeschaltet wird. Dies hat den Vorteil, dass ein erster Kühlpfad in eine erste Kondensationszone immer offen ist, während ein zweiter Kühlpfad in eine zweite Kondensationszone bei Bedarf hinzugeschaltet werden kann.Alternatively, a 2-way valve is conceivable in which only one condensation zone is switched on and off. This has the advantage that a first cooling path into a first condensation zone is always open, while a second cooling path can be connected in a second condensation zone if necessary.

Bevorzugt verschließt der Doppelkegel nur das Verdampferrohr und nicht den Kapillarbereich des Wärmerohrs. Dadurch kann zurückfliessende Arbeitsflüssigkeit wieder in den Arbeitskreislauf gelangen, was zu erhöhter Effizienz und Betriebssicherheit führt. Der Antrieb des Doppelkegels ist dabei außerhalb des Wärmerohrs angeordnet und erfolgt magnetisch. Außerhalb des Wärmerohrs steht gewöhnlich genügend Platz für den Antrieb zur Verfügung, und durch den magnetischen Antrieb sind keine Dichtungsmaßnahmen notwendig.Preferably, the double cone closes only the evaporator tube and not the capillary area of the heat pipe. As a result, returning working fluid can get back into the working cycle, which leads to increased efficiency and reliability. The drive of the double cone is arranged outside the heat pipe and takes place magnetically. Outside the heat pipe there is usually enough space available for the drive, and the magnetic drive does not require any sealing measures.

Die Wärmesenke (33) der ersten Kondensationszone (23) steht dabei vorzugsweise mit einer Heizvorrichtung in Wirkverbindung Dadurch kann die entstehende Abwärme vorteilhaft für eine andere Aufgabe genutzt werden.The heat sink (33) of the first condensation zone (23) is preferably in operative connection with a heating device. As a result, the waste heat produced can advantageously be used for another task.

Beim Einschalten der Halbleiterlichtquellen ist das Verdampferrohr Vorteilhafterweise zur ersten Kondensationszone offen und das Verdampferrohr zur zweiten Kondensationszone verschlossen. Die Umschaltung der Kondensationszonen erfolgt abhängig von der Temperatur der ersten Kondensationszone. Dadurch kann die vorgenannte Heizvorrichtung geregelt ausgeführt werden, und durch diese Vorrangschaltung ist ein definierter Betrieb der Anordnung zur Kühlung von Halbleiterlichtquellen möglich.When switching on the semiconductor light sources, the evaporator tube is advantageously open to the first condensation zone and the evaporator tube is closed to the second condensation zone. The switching of the condensation zones is dependent on the temperature of the first condensation zone. As a result, the aforementioned heating device can be designed to be regulated, and by means of this priority circuit a defined operation of the arrangement for cooling semiconductor light sources is possible.

In einer Ausführungsform erfolgt die Stromzuführung der Halbleiterlichtquellen über das Wärmerohr. Dies hat den Vorteil einer einfacheren und zuverlässigeren Konstruktion. Bei einer koaxialen Konstruktion des Wärmerohrs können einfache und kostengünstige Rohre als Stromzuführung verwendet werden, wobei die beiden Pole der Stromzuführung durch die beiden koaxialen Rohre gebildet werden.In one embodiment, the power supply of the semiconductor light sources via the heat pipe. This has the advantage of a simpler and more reliable design. In a coaxial construction of the heat pipe simple and inexpensive tubes can be used as a power supply, wherein the two poles of the power supply are formed by the two coaxial tubes.

Kurze Beschreibung der Zeichnung(en)Short description of the drawing (s)

Die Erfindung wird nachstehend anhand von Ausführungsbeispielen näher erläutert. Es zeigen:The invention will be explained in more detail below with reference to embodiments. Show it:

Fig. 1 Eine perspektivische Ansicht eines an ein Wärmerohr angeschlossenes Halbleiterlichtquellenmodul mit einem an das Wärmerohr angeschlossenen rosettenförmigen Kühlkörper in einer Ausführungsform nach dem Stand der Technik. Fig. 1 A perspective view of a connected to a heat pipe semiconductor light source module with a connected to the heat pipe rosette-shaped heat sink in an embodiment according to the prior art.

Fig. 2 Eine Detailzeichnung des geschnittenen Halbleiterlichtquellenmoduls mit dem dargestellten Ende des eingearbeiteten Wärmerohrs. Fig. 2 A detailed drawing of the cut semiconductor light source module with the illustrated end of the incorporated heat pipe.

Fig. 3 Eine perspektivische Ansicht der obigen Anordnung, eingebaut in einen Lampenschirm. Fig. 3 A perspective view of the above arrangement incorporated in a lampshade.

Fig. 4 Eine perspektivische Ansicht einer erfindungsgemäßen Anordnung zur Kühlung von Halbleiterlichtquellen mit zwei unabhängigen Wärmesenken die an je eine Kondensationszone angeschlossen sind, wobei zwischen den Kondensationszonen umgeschaltet werden kann. Fig. 4 A perspective view of an inventive arrangement for cooling semiconductor light sources with two independent heat sinks which are connected to a respective condensation zone, which can be switched between the condensation zones.

Fig. 5 Eine schematische Seitenansicht einer erfindungsgemäßen Anordnung zur Kühlung von Halbleiterlichtquellen. Fig. 5 A schematic side view of an inventive arrangement for cooling semiconductor light sources.

Fig. 6 Eine perspektivische Detailansicht eines erfindungsgemäßen Umschaltventils. Fig. 6 A detailed perspective view of a switching valve according to the invention.

Bevorzugte Ausführung der ErfindungPreferred embodiment of the invention

Fig. 1 zeigt eine Ausführungsform einer Anordnung zur Kühlung von Halbleiterlichtquellen nach dem Stand der Technik mit lediglich einer Kondensationszone, die von einem rosettenförmigen Kühlkörper 31 umschlossen ist, der die anfallende Kondensationswärme abführt. Eine Multichip-Leuchtdiode 5 (nicht gezeigt) mit einer aufgesetzten Primäroptik 51 ist auf einem Leuchtdiodenmodul 11 angebracht. Das Leuchtdiodenmodul 11 ist aus einem gut wärmeleitenden Material hergestellt, um die anfallende Verlustwärme der Multichip-Leuchtdiode 5 schnell und sicher abführen zu können. Das Leuchtdiodenmodul 11 ist in ein Gehäuse 13 eingebettet, das neben dem Leuchtdiodenmodul 11 noch eine Ansteuerelektronik 15 für die Multichip-Leuchtdiode 5 aufweist. Das Gehäuse 13 ist dabei aus einem schlecht Wärme leitenden Material ausgeführt, um die Temperaturbelastung der Ansteuerelektronik 15 durch die Multichip-Leuchtdiode 5 zu minimieren. Ein Wärmerohr 20 führt vom Leuchtdiodenmodul 11 zu einem Kühlkörper 31. Fig. 1 shows an embodiment of an arrangement for cooling semiconductor light sources according to the prior art with only one condensation zone, which is enclosed by a rosette-shaped heat sink 31, which dissipates the heat of condensation arising. A multi-chip LED 5 (not shown) with an attached primary optics 51 is mounted on a light-emitting diode module 11. The light-emitting diode module 11 is made of a good heat-conducting material in order to dissipate the resulting heat loss of the multi-chip LED 5 quickly and safely. The light-emitting diode module 11 is embedded in a housing 13 which, in addition to the light-emitting diode module 11, also has an electronic control unit 15 for the multichip light-emitting diode 5. The housing 13 is made of a poorly heat-conductive material to minimize the temperature load of the drive electronics 15 through the multi-chip LED 5. A heat pipe 20 leads from the light-emitting diode module 11 to a heat sink 31.

Fig. 2 zeigt einen Detailschnitt durch das Leuchtdiodenmodul 11 mit dem Gehäuse 13. Das Wärmerohr 20 ist mit seinem verdampferseitigem Ende 27 in das Leuchtdiodenmodul 11 eingearbeitet, und reicht bis an die Multichip-Leuchtdiode 5 heran, um die anfallende Verlustwärme möglichst effizient abtransportieren zu können. Die Wärme wird vom Wärmerohr über das verdampfte Arbeitsmedium in die Kondensationszone transportiert und dort vom Kühlkörper 31 (In Fig. 2 nicht gezeigt) absorbiert. Fig. 2 shows a detail section through the light-emitting diode module 11 with the housing 13. The heat pipe 20 is incorporated with its evaporator-side end 27 in the light-emitting diode module 11, and reaches up to the multi-chip LED 5 zoom in order to remove the heat loss as efficiently as possible can. The heat is transported from the heat pipe via the vaporized working medium in the condensation zone and there from the heat sink 31 (In Fig. 2 not shown).

Fig. 3 zeigt die ganze Anordnung in einen Reflektorschirm 53 eingebaut. Der Kühlkörper 31 ist mittig am Reflektorschirm 53 angebracht. Sämtliche erzeugte Wärme wird also zum Reflektorschirm 53 hin abgeleitet. Fig. 3 shows the whole arrangement built into a reflector screen 53. The heat sink 31 is mounted centrally on the reflector screen 53. All generated heat is thus discharged to the reflector screen 53 out.

Bei Kfz-Scheinwerfern nach dem Stand der Technik besteht jedoch oft das Problem der Vereisung der Streuscheibe. Diese muss im Winter geheizt werden, sonst bilden sich Eiskristalle an der Außenseite, die zu starker Blendung des Gegenverkehrs führen können. Daher würde es sich anbieten, die Abwärme der Leuchtdioden zur Heizung der Streuscheibe zu verwenden. Der Bauraum an der Vorderseite eines Kfz-Scheinwerfers ist jedoch begrenzt, so dass die Größe eines dort angebrachten Kühlkörpers oft nicht ausreichend ist, um die von den Leuchtdioden erzeugte Wärmeenergie beim Betrieb des Scheinwerfers 1 in warmer Umgebung immer komplett absorbieren zu können.In automotive headlamps according to the prior art, however, there is often the problem of icing of the lens. This must be heated in winter, otherwise ice crystals form on the outside, which can lead to strong glare of oncoming traffic. Therefore, it would be useful to use the waste heat of the LEDs for heating the lens. However, the space at the front of a motor vehicle headlamp is limited, so that the size of a heat sink mounted there is often not sufficient to always be able to completely absorb the heat energy generated by the LEDs during operation of the headlamp 1 in a warm environment.

Fig. 4 zeigt eine perspektivische Ansicht einer erfindungsgemäßen Anordnung zur Kühlung von Halbleiterlichtquellen, die das oben genannte Problem löst. Die Anordnung ist in diesem Fall ein Kfz-Scheinwerfer, bei dem die Abwärme der Multichip-Leuchtdiode 5 über ein Wärmerohr 20 zur einer Kondensationszone 23 geführt wird, die von einer Wärmesenke 33 gekühlt wird und damit die Streuscheibe 37 heizt. Die erfindungsgemäße Anordnung zur Kühlung von Halbleiterlichtquellen weist zwei umschaltbare Wärmesenken 33, 35 auf. Die Umschaltung wird mittels eines temperaturgesteuerten Ventils im Wärmerohr 20 bewerkstelligt. Die erste Wärmesenke 33 dient wie oben besc hrieben als Heizung, z.B. zur Scheinwerferenteisung. Die Temperatursteuerung ist so ausgelegt, dass vorrangig diese Aufgabe gelöst wird, diese Wärmesenke 33 ist also nur so lange in Betrieb wie hier Wärmeenergie benötigt wird. Ist die Solltemperatur erreicht, wird auf eine zweite Wärmesenke 35 umgeschaltet. Diese ist dazu ausgelegt, den anfallenden Wärmestrom immer und zu jeder Zeit absorbieren zu können. Fig. 4 shows a perspective view of an inventive arrangement for cooling semiconductor light sources, which solves the above problem. The arrangement is in this case a motor vehicle headlamp, in which the waste heat of the multi-chip LED 5 is passed through a heat pipe 20 to a condensation zone 23, which is cooled by a heat sink 33 and thus heats the lens 37. The inventive arrangement for cooling semiconductor light sources has two switchable heat sinks 33, 35. The switching is accomplished by means of a temperature-controlled valve in the heat pipe 20. The first heat sink 33 is used as above besc written as heating, for example, the headlight deicing. The temperature control is designed so that primarily this task is solved, this heat sink 33 is thus only as long in operation as here heat energy is needed. If the setpoint temperature is reached, is switched to a second heat sink 35. This is designed to be the to be able to absorb any heat flow at any time and at any time.

Die zweite Wärmesenke 35 kann dabei ein genügend großer Kühlkörper sein. Es ist aber auch denkbar, das die zweite Wärmesenke 35 an ein bestehendes oder dafür zu schaffendes Kühlsystem angeschlossen ist. Die zweite Wärmesenke 35 kann dabei z.B. an die Wasserkühlung des Kraftfahrzeugs angeschlossen sein. Es kann aber auch z.B. ein Peltierelement vorgesehen sein, das an die zweite Wärmesenke 35 angeschlossen ist.The second heat sink 35 may be a sufficiently large heat sink. But it is also conceivable that the second heat sink 35 is connected to an existing or to be created for cooling system. The second heat sink 35 may be e.g. be connected to the water cooling of the motor vehicle. But it can also be e.g. a Peltier element may be provided which is connected to the second heat sink 35.

Das Wärmerohr 20 weist ein Umschaltventil 21 auf, mittels dem zwischen zwei Kondensationszonen 23, 25 mit den entsprechend angeschlossenen Wärmesenken 33, 35 umgeschaltet werden kann. Die erste Wärmesenke 33 ist dabei als Ring um die Streuscheibe 37 des Scheinwerfers 1 ausgebildet. Dies ermöglicht es die Streuscheibe 37 bei schlechter Witterung soweit aufzuheizen, dass eine Eiskristallbildung sicher unterbunden wird. Dabei ist die Steuerung des Umschaltventils 21 so beschaffen, dass ab einer bestimmten Temperatur des Rings um die Streuscheibe 37 auf die zweite Kondensationszone 25 umgeschaltet wird, um eine effiziente Kühlung der Multichip-Leuchtdiode 5 zu gewährleisten und eine Überhitzung der Wärmesenke 33 zu verhindern.The heat pipe 20 has a switching valve 21, by means of which it is possible to switch between two condensation zones 23, 25 with the correspondingly connected heat sinks 33, 35. The first heat sink 33 is formed as a ring around the diffuser 37 of the headlamp 1. This makes it possible to heat the diffuser 37 in bad weather conditions to the extent that an ice crystal formation is reliably prevented. In this case, the control of the changeover valve 21 is such that from a certain temperature of the ring is switched to the second condensation zone 25 to the diffusion plate 37 in order to ensure efficient cooling of the multi-chip LED 5 and to prevent overheating of the heat sink 33.

Die Stromzuführung zu den Multichip-Leuchtdioden 5 wird dabei durch das Wärmerohr selbst bewerkstelligt, das aus einem elektrisch leitenden Material wie Aluminium oder Kupfer besteht. Werden zwei dieser leitenden Rohre mit einer Isolierung dazwischen koaxial ineinander angeordnet, so entsteht eine kostengünstige und robuste Stromzuführung für die Multichip-Leuchtdioden 5 und die auf dem Modul 11 angeordnete Elektronik.The power supply to the multi-chip LEDs 5 is thereby accomplished by the heat pipe itself, which consists of an electrically conductive material such as aluminum or copper. If two of these conductive tubes are arranged coaxially with one another with insulation between them, a cost-effective and robust construction results Power supply for the multi-chip LEDs 5 and arranged on the module 11 electronics.

Fig. 5 zeigt eine schematische Seitenansicht der erfindungsgemäßen Anordnung zur Kühlung von Halbleiterlichtquellen. Wie oben schon angedeutet, wird das Umschaltventil 21 so gesteuert, dass nach dem Einschalten der Multichip-Leuchtdiode 5 die erste Kondensationszone 23 mit der ersten Wärmesenke 33 aktiv ist. Hat die erste Wärmesenke eine bestimmte Temperatur erreicht, so schaltet das Umschaltventil 21 auf die zweite Kondensationszone 25 mit der zweiten Wärmesenke 35 um. Diese ist hinter dem Lampenschirm 53 angeordnet, und ist von der Größe her so bemessen, dass sie die anfallende Wärmeenergie jederzeit absorbieren kann. Wird die Temperatur aufgrund kalter Witterungsverhältnisse nicht erreicht, so bleibt permanent die erste Wärmesenke 33 aktiv, um Eiskristallbildung auf der Streuscheibe 37 möglichst zu verhindern. Fig. 5 shows a schematic side view of the inventive arrangement for cooling semiconductor light sources. As already indicated above, the switching valve 21 is controlled so that after switching on the multi-chip LED 5, the first condensation zone 23 with the first heat sink 33 is active. If the first heat sink has reached a certain temperature, the changeover valve 21 switches over to the second condensation zone 25 with the second heat sink 35. This is arranged behind the lampshade 53, and is sized in size so that they can absorb the heat energy generated at any time. If the temperature is not reached due to cold weather conditions, the first heat sink 33 remains permanently active in order to prevent ice crystal formation on the diffusing screen 37 as much as possible.

Fig. 6 zeigt eine schematische Detailzeichnung des Umschaltventils 21. Es besteht aus einem T-förmigen Rohrstück, in das ein permanentmagnetischer Doppelkegel eingebracht ist. Dieser besteht aus zwei Kegelförmigen Teilen 411, 412, die an der Basis profilgleich oder deckungsgleich zueinander ausgerichtet sind, so dass die Kegelspitzen in entgegengesetzte Richtungen zeigen. Zwischen den beiden Basisflächen kann noch ein zylinderförmiger Abschnitt 413 liegen. Die Basisflächen können aber auch gegeneinander versetzt angeordnet sein (nicht gezeigt), so dass zwischen den beiden Basisflächen eine zylinderförmige Schräge entsteht. Die Basisflächen der Kegel 411, 412 können auch eine ovale oder eiförmige Form aufweisen (nicht gezeigt). Auch Vielecke sind als Form der Basisfläche möglich. Der Kegel 411, 412 ist dann entsprechend der Basisfläche geformt (nicht gezeigt). Dieser Doppelkegel 41 sitzt im Zentrum des T-förmigen Rohrstücks. An den geschnittenen Enden ist der Querschnitt des Wärmerohrs 20 gezeigt. Die äußere Hülle besteht aus einem gasdichten Rohr 47, in das ein Kapillarrohr 45 aus einem porösen Material eingebracht ist. Innerhalb des Kapillarrohrs 45 liegt das Verdampferrohr 43. Im Bereich des Doppelkegels ist das Kapillarrohr ausgespart oder zumindest die Wanddicke schwächer ausgebildet. Der Basisdurchmesser des Doppelkegels 41 ist größer als der Durchmesser des Verdampferrohrs 43. Die Spitzen des Doppelkegels 41 weisen jeweils zur ersten und zweiten Kondensationszone 23, 25. Der Kegel 41 kann soweit in das Verdampferrohr 43 eindringen, bis er es komplett verschlossen hat. Das Kapillarrohr 45 bleibt davon unberührt, so dass zurückfließendes Arbeitsmittel wieder in die Verdampferzone 27 gelangen kann. Dies trägt zu einer effizienten Arbeitsweise des Wärmerohrs 20 bei. Außen an dem T-Stück sind geeignete gesteuerte Elektromagnete angeordnet (nicht gezeigt). Diese können je nach Ansteuerung den permanentmagnetischen Doppelkegel 41 in das Ende des Verdampferrohrs 43 der ersten oder der zweiten Kondensationszone 23, 25 drücken und dieses somit verschließen. Somit kann zwischen den beiden Kühlpfaden umgeschaltet werden, ohne dass der Wärmefluss insgesamt beeinträchtigt wird. Durch die Konstruktion als 3-Wege Ventil 21 ist ein Wärmefluss in eine der Kondensationszonen 23, 25 immer gewährleistet. Fig. 6 shows a schematic detail drawing of the switching valve 21. It consists of a T-shaped piece of pipe, in which a permanent magnetic double cone is introduced. This consists of two conical parts 411, 412, which are aligned at the base same profile or congruent to each other, so that the conical tips point in opposite directions. Between the two base surfaces can still be a cylindrical portion 413 lie. However, the base surfaces can also be arranged offset from each other (not shown), so that a cylindrical slope arises between the two base surfaces. The base surfaces of the cones 411, 412 may also have an oval or ovate shape have (not shown). Polygons are also possible as a form of the base surface. The cone 411, 412 is then shaped corresponding to the base surface (not shown). This double cone 41 is located in the center of the T-shaped pipe section. At the cut ends, the cross section of the heat pipe 20 is shown. The outer shell consists of a gas-tight tube 47 into which a capillary tube 45 made of a porous material is introduced. Within the capillary tube 45 is the evaporator tube 43. In the region of the double cone, the capillary tube is recessed or at least the wall thickness is formed weaker. The base diameter of the double cone 41 is larger than the diameter of the evaporator tube 43. The tips of the double cone 41 respectively to the first and second condensation zone 23, 25. The cone 41 can penetrate far enough into the evaporator tube 43 until it has completely closed. The capillary tube 45 remains unaffected, so that working fluid flowing back into the evaporator zone 27 can pass. This contributes to an efficient operation of the heat pipe 20. Externally attached to the tee are suitable controlled solenoids (not shown). These can, depending on the control, press the permanent-magnetic double cone 41 into the end of the evaporator tube 43 of the first or the second condensation zone 23, 25 and thus close it. Thus, it is possible to switch between the two cooling paths without affecting the heat flow altogether. Due to the construction as a 3-way valve 21, a heat flow into one of the condensation zones 23, 25 is always ensured.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Scheinwerferheadlights
1111
Leuchtdiodenmodul aus gut wärmeleitenden MaterialLight-emitting diode module made of good heat-conducting material
1313
Gehäusecasing
1515
Ansteuerelektronikcontrol electronics
2020
Wärmerohrheat pipe
2121
Umschaltventil des WärmerohrsChangeover valve of the heat pipe
3131
Kühlkörperheatsink
2323
Erste KondensationszoneFirst condensation zone
3333
Wärmesenke für die erste KondensationszoneHeat sink for the first condensation zone
2525
Zweite KondensationszoneSecond condensation zone
2727
Verdampferzoneevaporator zone
3535
Wärmesenke für die zweite KondensationszoneHeat sink for the second condensation zone
3737
Streuscheibediffuser
4141
permanentmagnetischer Doppelkegelpermanent magnetic double cone
411411
Erster KegelFirst cone
412412
Zweiter KegelSecond cone
413413
KegelmittelstückCone Centerpiece
4343
Verdampferrohrevaporator tube
4545
Kapillarrohrcapillary
4747
Äußeres gasdichtes RohrOuter gastight tube
55
Multichip-LeuchtdiodeMultichip LED
5151
Primäroptikprimary optics
5353
Lampenschirmlampshade

Claims (16)

  1. Arrangement for cooling semiconductor light sources (5), wherein the semiconductor light sources (5) are arranged on a heat-conducting module (11), which is operatively connected to an evaporator zone of a heat pipe (20), wherein a first condensation zone (23) of the heat pipe (20) is connected to a first heat sink (33), characterized in that the heat pipe (20) is connected to at least one second condensation zone (25) with at least one second heat sink (25), and a heat flow can be switched over between the condensation zones (23, 25) or the second condensation zone (25) can be switched in.
  2. Arrangement according to Claim 1, characterized in that the arrangement has a 3-way valve (21) for switching over the heat flow into the condensation zones (23, 25).
  3. Arrangement according to Claim 2, characterized in that the 3-way valve contains a permanent-magnetic double cone (41), and the cone vertices respectively alternately close off the end of the evaporator pipe (43) of a condensation zone.
  4. Arrangement according to Claims 1-3, characterized in that a capillary pipe (45) arranged coaxially around the evaporator pipe (43) is always open.
  5. Arrangement according to Claim 3 or 4, characterized in that a drive of the double cone (41) is arranged outside the heat pipe (20).
  6. Arrangement according to any of Claims 3-5, characterized in that the drive of the double cone (41) is effected magnetically.
  7. Arrangement according to any of the preceding claims, characterized in that when the semiconductor light sources (5) are activated, the evaporator pipe is open to the first condensation zone (23) and the evaporator pipe is closed off to the second condensation zone (25).
  8. Arrangement according to any of the preceding claims, characterized in that it has a device for switching over the heat flow into the condensation zones (23, 25) depending on the temperature of the first condensation zone (23).
  9. Arrangement according to Claim 1, characterized in that it has a 2-way valve for switching on and off the heat flow into the second condensation zone, wherein the heat flow into the first condensation zone is always possible.
  10. Arrangement according to any of the preceding claims, characterized in that the heat pipe (20) is simultaneously at least one power feed for the semiconductor light sources (5).
  11. Arrangement according to Claim 9, characterized in that the power feed is realized via at least two coaxial pipes.
  12. Arrangement according to any of the preceding claims, characterized in that the heat sink (33) of the first condensation zone (23) is operatively connected to a heating device.
  13. Headlight (1) comprising an arrangement according to Claim 11, characterized in that the arrangement has the heating device for heating a diffusing screen (37) of the headlight (1).
  14. Headlight (1) according to Claim 12, characterized in that the second condensation zone (25) is arranged below the headlight (1) and is airflow-cooled.
  15. Headlight (1) according to Claim 14, characterized in that the second condensation zone (25) is arranged behind the headlight (1).
  16. Method for cooling semiconductor light sources (5) with an arrangement according to any of Claims 1-15, characterized by the following steps:
    - switching on a first condensation zone (23) upon activation
    - upon a predetermined temperature of the first condensation zone (23) being exceeded, switching off this condensation zone and switching on a second condensation zone (25) or switching in a second condensation zone (25).
    - upon a predetermined temperature of the first condensation zone (23) being undershot, switching over to the first condensation zone (23) or switching off the second condensation zone (25).
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US8342728B2 (en) 2013-01-01
EP2229555A1 (en) 2010-09-22
CN101910715B (en) 2012-11-07
JP5210394B2 (en) 2013-06-12
US20110051449A1 (en) 2011-03-03
CN101910715A (en) 2010-12-08
TW200940894A (en) 2009-10-01
KR20100114077A (en) 2010-10-22
JP2011510438A (en) 2011-03-31
ATE532003T1 (en) 2011-11-15
WO2009089903A1 (en) 2009-07-23

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