TW201728856A - Method for cooling an LED light source arranged at a cooling body - Google Patents

Abstract

The invention relates to a method for cooling an LED light source (2) arranged at a cooling body (1). The cooling body (1) is arranged with the LED light source (2) arranged at it in a hermetically sealed housing (5) which is filled with a fluid (6), particularly with air (6), which has a first partial area (5a) where the housing walls are substantially made of a transparent material, particularly glass, and which serve as exit surface for the light generated by the LED light source (2). By means of a conveying device (3), particularly by means of of a fan (3), at least one circulation stream (8, 9, 10) is generated inside the housing (5) from the fluid (6) located inside the housing (5), in such a way that this circulation stream (8, 9, 10) is guided along cooling surfaces of the cooling body (1) and by housing wall surfaces and continuously absorbs heat from the cooling body (1) during the circulation and transfers it to the housing walls. The method according to the invention makes it possible to provide LED lighting arrangements with hermetically closed housings, which enable relatively low barrier layer temperatures even in case of high LED power, despite not using external lamp cooling bodies.

Description

Method for cooling an LED light source disposed on a cooling body

The invention relates to a method for cooling an LED light source arranged on a heat sink, and an LED illumination arrangement for carrying out the method according to the preamble of the independent patent application.

In particular, the present invention relates to cooling LED semiconductors in high performance LED lighting systems because such high performance LED lighting systems are now particularly useful in general LED lighting in indoor and outdoor areas such as street lights, technical lighting, and the like.

Any high-performance LED lighting system (ie, with typical electrical input power, in the range of one-digit watts to three-digit watts) requires a cooling system to keep it at a low temperature level for proper and long-term operation. . This cooling is now designed in a manner according to the prior art, typically by means of direct passive cooling, which supports the LED array in a planar manner on a thermally conductively cooled substrate (usually an aluminum core circuit or a ceramic substrate) (up to hundreds of LED semiconductors) Chip geometry setting). The cooling substrate is then internally mounted to the heat conducting lamp housing, the heat conducting lamp housing having cooling fins on the exterior. By using heat radiation and heated air to emit heat to the environment, the waste heat generated by convection is taken away. The optical exit of the lamp housing is sealed by a transparent, planar or refractive material (eg, glass, PMMA or polycarbonate, etc.). The cooling fins located outside are easy to be contaminated Maintenance work that cannot be ignored (especially in outdoor lighting or dusty areas). Non-planar illumination surface geometries (eg, dots or line reflectors for producing steerable light and for reducing glare) are difficult to produce.

Other passive cooling configurations place a cooling body with LEDs inside the hermetically sealed lamp housing. By heating the heat sink, free convection is created in the temperature range of about 40 ° C to 60 ° C, which flows along the cooler wall of the lamp housing, transferring heat to the cooler wall and transferring heat to the outside by convection, Then move to the environment. Non-planar illumination area geometries are possible, however, the power of such systems is limited to a lower two-digit watt range (typically 15W to 30W). For these configurations, the typical barrier layer temperature of the LED is from 100 ° C to 130 ° C. However, it is disadvantageous that these high operating temperatures not only greatly shorten their lifetime, but also greatly reduce the optical power of the LED.

In addition, other configurations use active fluid cooling, where high cost fluid cooling systems are not widely available. LED lighting systems that have been shown to be forced to cool by ambient air using a fan are very efficient and simple, and they also allow non-planar illumination area geometry with high optical density; however, the cost is to quickly pollute the active air supplied to the system. The system (fan blades, cooling fins, housing parts, filters, etc.) results in a maintenance cost that is even higher than when using a conventional passive cooling system. In the outdoor area, all attempts to design an open, economical, active cooling system failed due to humidity, snow, dust, pollen, soot, insects, and the like. Typical cleaning intervals range from a few months to half a year, which is unacceptable in industrial applications. In contrast, the cleaning interval of ordinary street lights is 1 to 5 years, depending on the installation location.

In view of this, it is an object of the present invention to provide a disadvantage that does not have the aforementioned prior art. A technical solution that at least partially avoids these disadvantages. In particular, the goal is to maintain the barrier layer temperature of the LED at a temperature of at least 50 ° C to 80 ° C and LED lighting settings when the LED power is increased (now 50 W to 400 W) without an external lamp heat sink.

This goal is achieved by the subject matter of the independent patent application.

Accordingly, a first aspect of the present invention is directed to a method for cooling an LED light source disposed on a heat sink, such as a single LED wafer or LED array (geometric arrangement of up to hundreds of LED semiconductor wafers).

The heat sink is provided with an LED light source, the LED light source being arranged on the heat sink, the heat sink being situated in a fluid-tight, in particular hermetically sealed, housing which is filled with a fluid (gaseous or liquid), in particular Filled with air, the housing has a light exit region (the first partial region according to the patent application), the inner casing wall being substantially, ie completely or at least largely consisting of a transparent material (preferably glass) Formed, and the housing wall acts as an exit surface for the light generated by the LED light source. Within the housing, one or more forced convection circulating streams of fluid within the housing are created, for which purpose an electrically operated delivery device is preferably used. "Circulating flow" here indicates a fluid flow, in which case the flow forms a circulation.

Depending on whether a gaseous fluid or a liquid fluid is used, the delivery device can be, for example, a fan, a fan, a propeller or a pump. In the case of multiple recycle streams, a common conveyor or also a plurality of conveyors can be used for multiple or all of the circulating streams.

In this context, all of the circulating flow is produced in such a way that all of the circulating flow flows along the cooling surface of the cooling body and then flows along the surface of the housing wall and continuously absorbs heat from the cooling body and releases heat during this procedure. To the wall of the housing, as the case may be by using, for example, air guiding metal sheets, air passages, air tubes, auxiliary fans and partition walls achieve.

The method according to the invention makes it possible to provide an LED illumination arrangement with a closed housing which enables a relatively low barrier layer temperature even at high LED power, although no external lamp heat sink is used.

In this manner, non-planar illumination region geometries (eg, including coupling to low glare reflector optics) are likely to have substantially higher power and a lower LED barrier layer than conventional LED illumination systems. This geometry is also possible with temperature. In addition, since the fluid volume is closed with respect to the environment, no contamination occurs. Dedicated fans with ceramic, magnetic or fluid bearings now have a life expectancy within the expected LED lifetime. Since the external heat sink is not used, the cleaning interval is not longer than the cleaning interval of the ordinary flat wall lamp housing.

The method according to the invention may also be used to evacuate heat or to incorporate a calibrated optically clear light exit cover (for example, a cover glass for a floodlight housing or a spotlight housing, for full mosaic glass for streetlights or for spherical surfaces) The size of the glass ball system, these covers have not been used recently or are rarely used.

In a preferred embodiment, a housing having a non-light exit region (the second portion of the region according to the patent application) is used, wherein in operation, as desired, the housing wall does not act as light generated by the LED light source. The exit surfaces, and preferably the walls of the housing are entirely or mostly made of a non-transparent material, preferably of a metallic material such as aluminum, copper, brass or steel. Here, one or more circulating streams are produced in a manner such that one or more of the circulating streams are respectively along the housing wall surface of the light exit region of the housing and/or the non-light exit region or the housing wall of the housing The surface is guided. Depending on the structural design of the lamp and the cooling concept, one of these alternatives may also Combinations of alternatives are especially preferred.

Furthermore, it is preferred to produce a plurality of circulating streams in a manner, in particular precisely two circulating streams, which lead the first circulating stream to be guided along the cooling surface of the cooling body and thereafter to the shell of the light exit region of the housing The body wall surface is guided and the second circulating stream is guided along the cooling surface of the cooling body and then guided along the surface of the housing wall of the non-light exit region of the housing. In this way, it is possible in a particularly strong manner for the heat dissipation of the housing wall surface of the light outlet region and the housing wall surface of the non-light outlet region of the housing.

Advantageously, this is done using a common delivery device for the recycle stream. In this way, less installation design related work can be maintained.

In a first preferred variant of the method, during the generation of the plurality of circulating streams, the first circulating stream is produced in a manner such that the first circulating stream circulates substantially in a vertical plane. The second recycle stream is generated in a manner such that the second recycle stream circulates substantially in a vertical or horizontal plane. This method variant is particularly suitable for lamp geometries having a pot-shaped light exit region with a non-light exit region of the housing on the upper side of the lamp geometry, the region having a pot shape or a lid shape, such as a conventional suspension lamp or Garden lights.

In another preferred variation of the method, if a plurality of circulating streams are produced, the circulating streams are produced in a manner such that the circulating streams circulate substantially in a vertical plane. This method variant is particularly suitable for flat, large surface lamp geometries, such as flat chandeliers or tunnel lights.

In still another preferred embodiment of the method, if a plurality of circulating streams are generated, the first circulating stream is generated in a manner such that the first circulating stream first follows the shell wall surface of the light exit region of the housing Guided and then flowed into the second circulating stream, and then guided along with the second circulating stream along the surface of the housing wall of the non-light exit region of the housing, followed by the first cycle The entire circulating stream formed by the flow and the second circulating stream is again directed to the cooling body.

Preferably, the pressure gradient is generated by the flow of the second circulating stream at the location of the first circulating stream leading to the second circulating stream, for example by means of a flow guiding assembly (flow pump) similar to the shape of the injector, first The circulating flow is drawn into the second circulating flow via the pressure gradient, which results in a particularly intense first circulating flow with a corresponding good heat exchange to the wall surface of the housing. It is also possible to form a stable circulating flow along the surface of the housing wall, even in the large and deep pot-shaped housing wall geometry.

In a further preferred embodiment variant of the method, if a plurality of circulating streams are generated, the first circulating stream and the second circulating stream are respectively separated from each other along the light exit region or the non-light exit region of the housing The wall surfaces of the housing are guided for merging and thereafter again guided as an integral flow to the cooling body. By separately guiding the circulating flow along the wall surfaces of the respective casings, it is advantageous to have an optimum heat transfer to the wall surface of the casing, since the colder circulating flow in the two circulating streams does not cool the two The hotter circulating stream in the recycle stream, which will be accompanied by a degradation in its heat exchange efficiency level.

In a preferred embodiment variant of the method, if a plurality of circulating streams are produced, and the plurality of circulating streams are guided as a whole to the cooling body, the conveying device is guided in a manner in the cooling body. The overall flow to the heat sink is distributed in such a way that the fluid streams forming the first recycle stream and the second recycle stream exit the heat sink at different locations, in particular in opposite directions. In this way, it is possible to avoid the use of a dispensing device.

Advantageously, the fluid partial streams forming the first recycle stream and the second recycle stream are deflected inside the heat sink, preferably each deflecting by 90°. In this way, a heat transfer from the modified self-cooling body to the fluid stream is produced.

In another preferred embodiment variant of the method, if a plurality of circulating streams are produced, the circulating streams are directed as a unitary flow to the cooling body, and downstream of the cooling body, the cooling device is guided by the conveying device The overall flow is distributed. Thus, the overall flow heated by the heat sink is distributed only to form a partial flow of the fluid forming the first recycle stream and the second recycle stream after passing through the heat sink.

In a further preferred embodiment variant of the method, the heat sink is arranged at a distance from the wall of the housing. In this way, the advantages result in a greater design freedom with regard to the placement of the heat sink inside the housing.

In a further preferred embodiment variant of the method, the heat sink is arranged to contact the housing wall in such a way that heat can be transferred from the heat sink to the housing wall by means of heat transfer. This is advantageous because part of the heat of the heat sink has been transferred to the housing wall by heat transfer and the remaining heat must be evacuated by means of one or more circulating streams in a forced convection manner. In this way, the constraint is that the heat sink is arranged to thermally contact the housing wall surface of the non-light outlet region of the housing and the circulating flow is produced according to the invention, the circulating flow flowing along the surface of the housing wall of the region and in this procedure The heat absorbed by the cooling body is transferred to the housing wall during the period, for example for a conventional suspension lamp or street lamp or garden lamp having a pot-shaped or cap-shaped light exit region, with a non-light exit region of the housing on the upper side of the lamps This area has a pot shape or a lid shape.

More preferably, depending on the ambient temperature, the transmission capacity of one or more delivery devices, as the case may be, is adjusted, and thus the transmission power is adjusted to the currently required thermal transmission power, resulting in current savings while reducing drive wear.

A second aspect of the invention relates to an LED lighting arrangement (LED lighting system) for carrying out the method according to the first aspect of the invention. The illumination arrangement comprises an LED light source disposed on the heat sink, such as a separate LED chip or LED array (up to hundreds of LED semiconductors) The geometric arrangement of the wafers, and at least one transport device, preferably of the electrically operable type, is used to generate a fluid stream for cooling the heat sink. The heat sink on which the LED light source is disposed is disposed in a fluid tight, preferably hermetically sealed, housing that is filled with a fluid (gaseous or liquid), preferably air.

Depending on whether a gaseous or liquid fluid is used, the delivery device can be, for example, a fan, a fan, a propeller or a pump.

The housing has a light exit region (first partial region according to the patent application), wherein the housing wall consists essentially of a transparent material, preferably glass, and in operation, as desired, the housing wall acts as an LED source The exit surface of the light.

The heat sink and the conveying device are disposed inside the casing and may be formed in a manner by using an additional flow guiding device (for example, an air guiding metal sheet, an air passage, an air tube, an auxiliary fan, and a partition wall). The LED light source and the start-up conveying device generate at least one forced convection circulating flow (fluid flow, in the case where the fluid forms a fluid circulation) from the fluid located inside the casing by the conveying device, such as when we need to operate, the cycle The flow flows along the cooling surface of the heat sink and thereafter flows along the surface of the housing wall and continuously absorbs heat from the heat sink and transfers heat to the housing wall during this procedure. In this way, the advantages already described in the context of the first aspect of the invention are produced.

In a preferred embodiment, the housing additionally has a non-light exit region (the second partial region according to the patent application), wherein in operation the shell wall as desired is not the exit surface that acts as light generated by the LED light source. Preferably, the walls of the housing are wholly or mostly made of a substantially non-transparent material, preferably of a metallic material such as aluminum, copper, brass or steel. The LED illumination arrangement is formed in a manner, or in other words the housing, the heat sink, the conveying device and possibly additional flow guiding elements are formed in such a way that, in operation, as desired, When the delivery device is activated, at least one of the circulating flow flows along the surface of the housing wall of the light exit region of the housing and/or along the surface of the housing wall of the non-light exit region of the housing. Depending on the design of the LED lighting arrangement and the cooling concept, one or the other of these alternatives or combinations of such alternatives may be particularly preferred.

Thus, it is more desirable for the LED illumination arrangement to be formed in such a way that when the delivery device is activated, a plurality of circulating flows, such as exactly two circulating flows, are required in operation, in particular, the first circulating flow first along The cooling surface of the cooling body flows and thereafter flows along the surface of the housing wall of the light exit region of the housing and the second circulating flow first flows along the cooling surface of the cooling body and thereafter flows along the surface of the housing wall of the non-light exit region of the housing . In this way, it is possible in a particularly strong manner for the heat dissipation of the housing wall surface of the light outlet region and the housing wall surface of the non-light outlet region of the housing.

Advantageously, the LED lighting arrangement has a common delivery device for all of the circulating streams. In this way, less installation design related work can be maintained.

In a first preferred variant of the LED illumination arrangement, if a plurality of loop settings are generated during operation, such as when the conveyor is activated, the illumination arrangement can be formed in a manner such that the first circulation stream is substantially The vertical plane circulates and the second circulating stream circulates substantially in a vertical or horizontal plane. This variant is particularly suitable for LED lighting arrangements having a pot-shaped light exit region, on the upper side of which has a pot-shaped or cap-shaped region of the non-light exit of the housing, for example for a conventional suspension lamp or The situation of garden lights.

In a second preferred variant of the LED illumination arrangement, if a plurality of loop settings are generated during operation, such as when the conveyor is activated, the illumination settings are formed in a manner that enables each of the loop streams It essentially circulates in a horizontal plane. This variant is especially suitable for In accordance with the LED illumination arrangement of the present invention, the LED illumination arrangement has a planar, large surface housing geometry, such as a planar chandelier or tunnel light.

In still another preferred variation of the LED illumination arrangement, if a plurality of loop settings are generated during operation such as when the conveyor is activated, the illumination setting is formed in a manner that causes the first circulation stream to enter the second a circulating stream, after the first circulating stream flows along the surface of the shell wall of the light exit region of the housing and then flows along the surface of the shell wall of the non-light exit region of the housing along with the second circulating stream, by the first circulating stream The integral circulating flow formed by the second circulating flow again flows to the cooling body.

If the illumination arrangement is formed in a manner that is preferably such that the flow of the second circulating stream flows at the location of the first circulating stream to the second circulating stream, for example by means of a flow guiding assembly of the shape of the injector ( The flow pump produces a pressure gradient via which the first circulation flows through the suction to the second circulation stream, resulting in a particularly intense first circulation flow with a corresponding good heat exchange to the wall surface of the housing. It is also possible to form a stable circulating flow along the surface of the housing wall, even in a relatively large and deep pot-shaped housing geometry.

In still another preferred variation of the LED illumination arrangement, if a plurality of loop settings are generated during operation such as when the conveyor is activated, the illumination setting is formed in a manner that causes the first circulation stream and the second The circulating flow flows together after flowing separately from each other along the surface of the housing wall of the housing or the surface of the housing wall of the non-lighting exit region, and thereafter the first circulating stream and the second circulating stream flow again as a unitary flow to the cooling body. The advantage of separate flow of the circulating flow along the wall surface of the housing is that it is possible to optimally transfer heat to the surface of the housing wall because the colder circulating flow in the two circulating streams does not cool the two circulating streams. A hotter circulating stream, which will result in a degradation in its heat exchange efficiency.

In another preferred variant of the LED lighting arrangement, if in operation, as one would require a plurality of cyclic settings when the conveyor is activated and the circulating streams flow again as a unitary flow to the cooling device, the illumination is set in a manner Forming in such a manner that the entire flow guided by the conveying device to the cooling body is distributed in the cooling body in such a way that the fluid flow forming the first circulation flow and the second circulation flow is at different positions, in particular Leave the heat sink in the opposite direction. In this way, it is possible to avoid the use of additional dispensing devices.

Advantageously, the fluid streams forming the first recycle stream and the second recycle stream are deflected inside the heat sink, preferably 90° each. In this way, a heat transfer from the modified self-cooling body to the fluid stream is produced.

In another preferred variant of the LED lighting arrangement, if in operation, as one would require a plurality of cyclic settings when the conveyor is activated and the circulating streams flow again as a unitary flow to the cooling device, the illumination is set in a manner Formed in such a way that the overall flow is distributed downstream of the heat sink. Thus, the overall flow heated by the heat sink is divided into a fluid partial stream forming a first recycle stream and a second recycle stream only after passing through the heat sink.

In yet another preferred variant of the LED illumination arrangement, the heat sink is disposed at a distance from the housing wall. In this way, the advantages result in a greater design freedom with regard to the placement of the heat sink inside the housing.

According to another preferred variant of the LED illumination arrangement according to the invention, the heat sink is arranged to contact the housing wall in such a way that heat can be transferred from the heat sink to the housing wall by means of heat transfer. This has the advantage that part of the heat of the heat sink has been transferred to the housing wall by thermal conduction and the remaining residual heat must be evacuated by means of one or more circulating flows in a forced convection manner. Therefore, the limitation condition is that the heat sink is disposed as a casing wall surface of the non-light exit region of the heat-conducting contact housing. In accordance with the invention, a circulating stream is produced inside the light exit region, the circulating flow flowing along the surface of the housing wall of the region and during which the heat absorbed by the heat sink is transferred to the housing wall, for example for a pot or lid Conventional suspension lights or street lights or garden lights in the shaped light exit area have a non-light exit area of the housing on the upper side of the lights, the area having a pot shape or a lid shape.

In yet another preferred variation of the LED illumination arrangement, a reflector for reflecting and/or concentrating light generated by the LED source is included. In operation, as desired, the reflector acts as a heat sink for at least one of the circulating flow and/or at least one LED light source.

In yet another preferred variation of the LED illumination arrangement, the housing of the LED illumination arrangement is filled with another non-air fluid, preferably filled with hydrogen, helium, fluorinated hydrocarbons, nitrogen, carbon dioxide or sulfur hexafluoride. In this way, if the housing is filled with helium instead of air, it is possible to transfer about five times the heat using the same volume flow or use the same heat transfer capability to reduce the fan power even to factor 1/53 (=0.008).

In yet another preferred variation of the LED illumination arrangement, the fluid in the housing is an overpressure gaseous fluid. In this way, it is possible to increase the heat transfer capability of the fluid.

It is also possible to increase the pressure and use a combination of another non-air fluid (eg, helium). Chemically inert liquids having high heat capacity (for example, fluorinated hydrocarbons) can also be provided as a fluid.

In yet another preferred variant, the LED lighting arrangement comprises, as required by the operation, components for trapping contaminating particles and/or for avoiding condensation, in particular fine filters, electric filters, zeolites and/or Or adsorbing a substance, in particular a silicone, which is arranged in an area of the interior of the housing, through which the fluid flows when the delivery device is activated.

In yet another preferred variant, the LED lighting settings respectively comprise a security device or electricity Flow saving devices that maintain a constant temperature and/or based on solar radiation, thereby avoiding overheating of the LED light source by reducing the supply of energy or by means of a cutting operation, respectively, in order to prevent detection of excessively high LED temperatures, internal temperature of the housing and / or direct solar radiation on the casing.

Furthermore, it is preferred that the LED illumination arrangement includes means for adjusting the transmission power of the delivery device depending on the ambient temperature, and thereby adjusting the transmission power to the currently required thermal transmission power, resulting in a flow saving while reducing wear on the drive.

1‧‧‧heater/air cooler

2‧‧‧LED light source

3‧‧‧Conveyor/fan

4‧‧‧Overall circulation

5‧‧‧Shell

5a‧‧‧Part I area

5b‧‧‧Part II area

6‧‧‧ Fluid/Air

7‧‧‧Property flow guiding device/attribute air guiding metal piece/flow guiding and distributing device

8‧‧‧First circulating flow/air cylinder

9‧‧‧Second circulation

10‧‧‧ third circulation

11‧‧‧ reflector

12‧‧‧ gap

In the following, specific embodiments of the various aspects of the invention are described in more detail with the aid of the drawings.

1 shows the functional principle of a first LED illumination arrangement having a housing shape of a conventional street light in accordance with the present invention; and FIG. 2 shows the functional principle of a second LED illumination setting having the shape of a cuboid high power LED lamp in accordance with the present invention; 3 shows a block diagram of overheat protection for LED lighting settings in accordance with the present invention.

1 and 2 illustrate the principle of a method for cooling an LED light source 2 arranged on a heat sink 1 according to the invention, which according to the invention forms a conventional lamp (Fig. 1) with two cycles by means of a first LED illumination arrangement Streams 8, 9, and in accordance with the present invention, a cuboid high power LED lamp (Fig. 2) having a power input of 150 W is formed by means of a second LED illumination setup, having three circulating streams 8, 9, 10.

The lamp shown in Fig. 1 has a pot-shaped, surrounding glass-inlaid lower housing portion 5a (in the first partial region according to the patent application), which is required for the lower housing in operation. Part of it acts as an exit surface for the light generated by the LED light source 2. A cover-shaped metal cover 5b having a decorative design (the second partial region according to the patent application) is at the upper end of the casing portion 5a. The lower housing portion 5a of the inlaid glass and the metal cover 5b together form a hermetically sealed lamp housing 5 filled with air.

The LED light source 2 is disposed on a finger-shaped heat sink or a finned heat sink 1, which is centrally disposed in a transition portion between the lower housing portion 5a of the mosaic glass and the metal cover 5b, and is operated as in our case. It is necessary to perform cooling by means of the electric fan 3 provided thereon.

It can be seen from the arrow indicating the flow of air that the entire air flow 4 blown into the heat sink 1 by the fan 3 is divided into two partial air flows inside the heat sink 1, wherein each of the air flows is in the opposite direction. It is deflected by about 90° so that the air flows out of the heat sink 1 at the opposite end.

The fluid flow out of the cooling body 1 on the right in the illustration is deflected downward by the property air guiding metal sheet 7 and forms a first circulating stream 8 which is along the pot-shaped housing portion 5a of the surrounding glass-embedded glass. The inner wall surface flows clockwise.

The fluid flow out of the cooling body 1 on the left in the illustration is deflected upward by the property air guiding metal piece 7 and forms a second circulating flow 9, which is clockwise along the inner wall surface of the cap-shaped metal cover 5b. The direction flows.

At that time, as we used the lamp, each of the two circulating streams 8, 9 circulated substantially in a vertical plane.

After the first circulating stream 8 flows along the wall surface of the lower casing portion 5a, the first circulating stream enters the second circulating stream 9 to the metal cover 5b in the region of the upper end portion of the casing portion 5a, wherein the first The circulating stream then along with the second circulating stream 9 along the wall surface of the metal cover 5b The flow, which is subsequently formed by the first circulating stream 8 and the second circulating stream 9 , reaches the fan 3 again and is again transmitted to the cooling body 1 .

It can be seen that the first circulating stream 8 flows into the second circulating stream 9 via the narrow gap 12, at which a pressure gradient (air flow pump) is generated by the second circulating stream 9. Here, the first circulating stream is drawn into the second circulating stream 9 by the generated pressure gradient.

In other words, the air flow from the right side of the air-cooling body 1 exits the heat sink 1 to the portion 5a of the mosaic glass of the housing 5 and forms an air cylinder 8 there, which flows along the surface of the glass, cooling during this procedure and It then enters the upper metal portion 5b of the casing 5. During this procedure, the flow direction and orientation of the circulating stream 8 is significantly affected by the suction effect of the slit 12. This push-pull principle gives the air cylinder 8 a very high stability. Inside the metal cover 5b, the entire flow formed by the first circulating flow 8 and the second circulating flow 9 flows along the metal wall of the cover 5b, releasing heat to the metal wall and sucking in again by the center fan 3. The cooled air then flows again through the LED heat sink 1 and the cycle begins again.

The high power LED lamp shown in Figure 2 has a wide area, planar, cuboid lamp housing 5. These lights are used, for example, as floodlights, pedestrian crossing lights and tunnel lights. The housing 5 of the lamps is formed by a dome-shaped housing 5b (which is a second partial region according to the patent application), the dome-shaped housing being made of a steel sheet, the open side of which is covered by a cover glass 5a Covering (in the first partial region according to the scope of the patent application), the cover glass serves as an exit region for the light generated by the LED light source 2 as required by the person. Fig. 2 is a plan view showing the side of the lamp formed by the cover glass 5a.

The dome-shaped housing 5b and the cover glass 5a together form a hermetically sealed lamp housing 5 filled with air 6.

The LED light source 2 is an LED array, and the LED array is disposed on the section cooling body 1 Above, the profile heat sink is disposed in the region of one of the side walls of the dome-shaped housing 5b, and is cooled by the electric fan 3 disposed on the right side thereof as needed in operation.

It can be seen from the arrow indicating the air flow that the entire air flow 4 blown into the heat sink 1 by the fan 3 flows as the only air flow through the heat sink 1 and flows out of the air flow by means of the flow guide and distribution device 7 . The cooling body 1 is directly divided into three partial streams 8, 9, 10, wherein the first partial flow forms a circulating flow 8 along the inner wall surface of the cover glass 5a, and the second partial flow follows the inner wall surface of the rear wall of the dome-shaped housing 5b. The circulating stream 9 is formed and the third partial stream forms a circulating stream 10 along the inner walls of the three side walls of the dome-shaped casing 5b.

The first circulating stream 8 and the second circulating stream 9 are separated from each other by a wide surface reflector 11 in a large area, which reflects the light generated by the LED light source 2.

It can be seen that the three circulating streams 8, 9, 10 are merged again into an integral stream 4 before reaching the fan 3, which is separated from each other along the surface of the housing wall of the cover glass 5a (circulating flow 8), a dome-shaped housing The wall 5b (circulating stream 9) and the side wall of the dome-shaped housing 5b (circulating stream 10) flow and then are guided through the cooling body 1 again.

When the high power lamp shown in Figure 2 is used as desired, each of the three circulating streams 8, 9, 10 circulates substantially in a horizontal plane.

3 is a block diagram showing a thermostat safety device or a current saving device for reacting to solar radiation for LED lighting settings according to the present invention, respectively, when excessively high LED temperature or internal temperature of the housing and/or to the shell are detected. In the case of direct solar radiation on the body 5, the device avoids overheating of the LED light source 2 by means of reduced supply of energy or by means of a cutting operation, respectively.

The device includes a solar sensor and two temperature sensors, three comparators for determining the switch value based on the design, and an OR circuit. If the temperature in the housing is above 50 °C Or if solar radiation is detected, the device is used to limit the optical power to about 30% by means of amplifier k1. If the temperature in the housing 5 rises above 70 ° C, the LED light source is completely turned off by the second amplifier k2. The signal combined via the diodes is adapted to the world-standardized dimmer standard input (1V to 10V) of the LED driver by means of an operational amplifier calculation step (y=-u+10).

While the preferred embodiment of the present invention has been described in the present application, it is to be understood that the invention is not limited thereto and may be carried out in other ways within the scope of the following claims.

Claims (32)

A method for cooling an LED light source (2) disposed on a heat sink (1), comprising the steps of: a) arranging the heat sink (1) on which the LED light source (2) is disposed Filled with a fluid (6), in particular one of the air-tight (6) fluid-tight, in particular hermetically sealed housing (5), the housing having a first partial region (5a) in which the first portion The housing wall in the region consists essentially of a transparent material, in particular glass, and the housing walls act as an outlet surface for the light generated by the LED light source (2); and b) by means of a conveying device (3) In particular, the fluid (6) located inside the casing (5) generates at least one circulating flow (8, 9, 10) inside the casing (5) by means of a pump or a fan (3), In such a way that the circulating flow (8, 9, 10) is guided along the cooling surface of the cooling body (1) and along the surface of the housing wall, and the heat from the cooling body (1) is continuously absorbed during the cycle and Transfer heat to the walls of the housing. The method of claim 1, wherein the heat sink (1) is disposed inside a casing (5), the casing having a second partial region (5b), wherein in operation, as desired by the person The housing wall does not serve as an exit surface for the light generated by the LED light source (2), and in particular wherein the housing walls are composed of a non-transparent material, in particular a metal, and wherein the at least one is produced in one way Circulating flow (8, 9, 10) in such a manner that the at least one circulating flow along the surface of the housing wall of the first partial region (5a) of the housing (5) and/or along the housing (5) The surface of the housing wall of the second partial region (5b) is guided. The method of claim 2, wherein the plurality of circulating streams (8, 9, 10), in particular the two circulating streams (8, 9), are generated as at least one circulating stream in such a way that The first circulating stream (8) is guided along the cooling surface of the cooling body (1) and along the surface of the casing wall of the first partial region (5a) of the casing (5) and a second circulating flow (9) The cooling surface along the cooling body (1) and the surface of the housing wall along the second partial region (5b) of the housing (5) are guided. The method of claim 3, wherein the plurality of circulating streams (8, 9, 10) are produced using a common conveying device (3). The method of any one of claims 3 to 4, wherein the first circulating stream (8) is produced in a manner such that the first circulating stream circulates substantially in a vertical plane, and The second circulating stream (9) is produced in a manner such that the second circulating stream circulates in a vertical or horizontal plane. The method of any one of claims 3 to 4, wherein the plurality of recycle streams (8, 9, 10) are generated in a manner such that each of the plurality of loop streams is substantially Loops in a horizontal plane. The method of any one of clauses 3 to 6, wherein the first circulating stream (8) is produced in a manner such that the first circulating stream is along the casing (5) The casing wall surface of the first partial region (5a) is guided to the second circulating stream (9), and then the first circulating stream along with the second circulating stream (9) along the casing ( 5) The surface of the housing wall of the second partial region (5b) is guided, and then the overall circulating flow (4) formed by the first circulating flow (8) and the second circulating flow (9) is again passed through Guided to the heat sink (1). The method of claim 7, wherein the second circulating stream (9) of the flow generates a pressure gradient at a position of the first circulating stream (8) leading to the second circulating stream (9), The first circulating stream (8) is pumped to the second circulating stream (9) by means of the pressure gradient. The method of any one of clauses 3 to 6, wherein the first circulating stream (8) and the second circulating stream (9) are respectively separated from each other along the first partial region (5a) or The surface of the housing wall of the second partial region (5b) is guided after being merged and thereafter again guided as an integral flow (4) to the cooling body (1). The method of any one of clauses 7 to 9, wherein the integral flow (4) guided to the cooling body (1) by the conveying device (3) is in a manner in the cooling body The dispensing is carried out in (1) in such a way that the fluid flow forming the first circulating stream (8) and the second circulating stream (9) leaves the cooling body (1) at different positions, in particular in opposite directions. The method of claim 10, wherein the fluid streams forming the first circulating stream (8) and the second circulating stream (9) are deflected inside the cooling body (1), in particular each Deflected by 90°. The method of any one of clauses 7 to 9, wherein the integral stream (4) directed to the heat sink (1) is distributed downstream of the heat sink (1). The method of any of the preceding claims, wherein the heat sink (1) is disposed at a distance from the wall of the housing or in contact with a wall of the housing for The heat of the cooling body is transferred to the walls of the housing. A method according to any one of the preceding claims, wherein the transport capacity of the transport device (3) is adjusted depending on the ambient temperature. An LED illumination setting for performing the method of any of the preceding claims, comprising: a) at least one LED light source (2) disposed on a heat sink (1); b) at least one transport device (3), in particular a pump or a fan (3), for generating cooling for cooling a fluid flow (4) of the body (1); and c) a fluid-tight, in particular hermetic closed casing (5) filled with a fluid (6), in particular filled with air (6), Wherein the housing (5) has a first partial region (5a) in which the housing wall consists essentially of a transparent material, in particular glass, and in operation such as the housing wall required by the person Acting as an exit surface for the light generated by the at least one LED light source (2), wherein the LED light source (2) is disposed on the heat sink (1) and the transport device (3) is disposed inside the housing (5) And wherein the cooling body interacts with the conveying device, in particular with the property flow guiding device (7), in such a way that, in operation, as required by the person when starting the conveying device (3), the conveying device (3) Producing at least one circulating stream (8, 9, 10) of the fluid (6) disposed inside the casing (5), the circulating stream flowing along the cooling surface of the cooling body (1) and the trailing edge The surface of the wall of the housing flows, and in this case the heat from the heat sink (1) is continuously absorbed and transferred to the wall of the housing. The LED lighting arrangement of claim 15 wherein the housing (5) has a second partial region (5b), wherein in operation, as required by the person, the housing walls do not serve as the at least one LED light source (2) the exit surface of the generated light, and in particular, wherein the housing walls consist essentially of a non-transparent material, in particular a metal, and wherein the LED arrangement is formed in a manner, as in our operation The method is such that when the conveying device (3) is activated, the at least one circulating stream (8, 9, 10) is along the surface of the casing wall of the first partial region (5a) of the casing (5) and/or Flow along the surface of the housing wall of the second partial region (5b) of the housing (5). The LED lighting arrangement of claim 16 wherein the lighting arrangement is formed in a manner such that at least two circulating streams (8, 9) are generated during operation as required by the delivery device (3). 10) wherein a first circulating stream (8) flows along a cooling surface of the first partial region (5a) of the casing (5) and a second circulating stream (9) along the casing (5) The cooling surface of the second partial region (5b) flows. The LED illumination arrangement of claim 17 wherein the illumination arrangement is formed in a manner such that the same delivery device (3) produces the at least two circulating streams (8, 9, 10). The LED lighting arrangement of any one of clauses 17 to 18, wherein the lighting arrangement is formed in a manner such that the first circulating stream (8) circulates substantially in a vertical plane and the The second circulating stream (9) circulates substantially in a vertical or horizontal plane. The LED lighting arrangement of any one of clauses 17 to 18, wherein the lighting arrangement is formed in a manner such that the circulating streams (8, 9, 10) are substantially in a horizontal plane cycle. The LED lighting arrangement of any one of clauses 17 to 20, wherein the lighting arrangement is formed in a manner such that the first circulating stream (8) is along the housing (5) The surface of the housing wall of the first partial region (5a) is guided into the second circulating stream (9), and then the first circulating stream along with the second circulating stream (9) along the housing (5) The surface of the casing wall of the second partial region (5b) flows, and then the integral circulating flow (4) formed by the first circulating flow (8) and the second circulating flow (9) flows again to the cooling body (1) ). The LED lighting arrangement of claim 21, wherein the illumination setting is formed in a manner such that a second circulating stream (9) from the flow enters the second cycle in the first circulating stream (8) A pressure gradient is generated at the location of stream (9) which draws the first recycle stream (8) into the second recycle stream (9). The LED lighting arrangement of any one of clauses 17 to 20, wherein the lighting arrangement is formed in a manner such that the shell is in the first partial region (5a) along the casing (5) The first circulating stream (8) after flowing the body wall surface is combined with the second circulating stream (9) after flowing along the surface of the casing wall of the second partial region (5b) of the casing (5) and Thereafter, it flows again as a whole stream (4) to the heat sink. The LED lighting arrangement of any one of clauses 21 to 23, wherein the lighting arrangement is formed in a manner that is guided to the cooling body (1) by the conveying device (3) The bulk flow (4) is distributed inside the heat sink (1) in a manner such that the fluid streams forming the first recycle stream (8) and the second recycle stream (9) are at different locations In particular, it leaves the heat sink (1) in the opposite direction. The LED lighting arrangement of any one of clauses 21 to 23, wherein the lighting arrangement is formed in a manner such that a pair of downstream of the cooling body (1) is guided to the cooling body (1) The overall stream (4) is allocated. The LED lighting arrangement of any one of the 15th to 25th, wherein the cooling body (1) is disposed at a distance from the housing wall or in contact with a housing wall for The heat from the heat sink is transferred to the housing walls by means of heat conduction. The LED illumination arrangement of any one of clauses 15 to 26, further comprising a reflector for reflecting and/or bundling light generated by the LED light source (2) (11), wherein in operation, the reflector (11) acts as a cooling device for the flow guiding device of the at least one circulating flow and/or the at least one LED light source. The LED lighting arrangement of any one of clauses 15 to 27, wherein the casing (5) is filled with another non-air fluid (6), in particular filled with hydrogen, helium, fluorinated hydrocarbons, nitrogen , carbon dioxide or sulfur hexafluoride. The LED lighting arrangement of any one of clauses 15 to 28, wherein the fluid (6) in the casing (5) is under an overpressure. The LED lighting arrangement of any one of clauses 15 to 29, further comprising, as required by the operation, for retaining contaminating particles and/or for preventing condensation, in particular fine A filter, an electric filter, a zeolite and/or an adsorbent substance, in particular a silicone rubber, is arranged in a region of the interior of the housing (5) via which the fluid (6) flows. The LED lighting arrangement of any one of clauses 15 to 30, which further comprises a safety device or a current saving device, respectively, which are kept at a constant temperature and/or react to solar radiation, respectively by means of a reduced supply The energy of the LED light source (2) is prevented from being overheated by means of a cutting operation to prevent detection of excessively high LED temperatures, internal temperature of the housing and/or direct solar radiation on the housing. The LED lighting arrangement of any one of clauses 15 to 31, further comprising means for adjusting the power of the conveying device (3) to the currently required heat transfer power depending on the ambient temperature.