• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An LED lighting system according to the invention has a two-dimensional array of LEDs with a cooling system. The cooling system consists of a system of cooling channels, which are arranged on the back of the array, an inflow channel (4), a discharge channel (5), a cooler (6) and a pump (7). A system of several parallel cooling channels leads from the inlet channel (4) to the outlet channel (5), wherein the cooling channels (13) are arranged according to the arrangement of the LEDs in the array. The inflow channel (4) has a cross section which increases in the direction of flow, while the cross section of the outflow channel (5) decreases in the direction of flow. The changing cross sections cause a constant cooling fluid pressure through the parallel cooling channels. The changing cross sections of the inflow and outflow channel (4, 5) cause a constant pressure over all the cooling channels (13). The cooling fluid used is water mixed with glycol, which is non-abrasive and serves as a lubricant in the pump (7).
    公开号:CH712769A2
    申请号:CH00870/17
    申请日:2017-07-04
    公开日:2018-01-31
    发明作者:Alraun Markus；Natsdazik Peter
    申请人:M3D Ag；
    IPC主号:
    专利说明:

    description
    Technical Field The invention relates to an LED lighting system, in particular an LED array for high-performance lighting.
    PRIOR ART LED arrays are used commercially for high-performance lighting, for example for use in headlights for vehicles. In order to maintain the performance of the LEDs, the temperature of the LED arrays is frequently kept below a predetermined maximum value by means of a cooling fluid in a cooling circuit, as disclosed for example in DE 20 2006 019 381 and DE 10 2009 028 525. There, the LEDs are cooled sequentially using a cooling circuit using water or ethylene glycol.
    DESCRIPTION OF THE INVENTION It is the object of the present invention to provide an LED lighting system with a two-dimensional LED array with a cooling device which can be implemented more efficiently and in a space-saving manner than in the prior art.
    This object is achieved by an LED array according to claim 1.
    An LED lighting system has a plurality of LEDs, which are arranged in a two-dimensional array on a circuit board, the circuit board being connected to a cooling system.
    According to the invention, the cooling system has a plurality of cooling channels for a cooling fluid, which extend over the back of the circuit board, which faces away from the LEDs. The cooling channels are designed according to the arrangement of the LEDs, so that the cooling channels are arranged directly under the LEDs and as close as possible to the LEDs. The cooling channels are connected to an inflow channel and an outflow channel. The large number of cooling channels branch off from the inflow channel, run parallel to one another over the rear of the circuit board and lead to the outflow channel. The inlet and outlet channels are connected to a cooler and a pump. In particular, both the inflow and the outflow channel in the area of the connections to the cooling channels have a cross section that changes over their length. In the region in which the plurality of parallel cooling channels branch off from it, the inflow channel has an increasing cross section over its length in the flow direction of the cooling fluid. In the region in which the plurality of cooling ducts running in parallel lead into the latter, the drainage duct has a cross-section that decreases over its length in the direction of flow of the cooling fluid.
    The invention is characterized on the one hand by an arrangement of the cooling channels, which corresponds to the arrangement of the LEDs in rows of a two-dimensional array. The cooling channels run along the rows of LEDs and immediately below the LEDs, so that the distance between the rows of LEDs and the cooling channels is minimized. The cooling channels arranged in parallel enable simultaneous cooling of a large number of LEDs with a minimum of cooling channel length, as a result of which efficient and space-saving cooling is achieved.
    The invention is particularly characterized in that the cross section of the inflow channel, from which the cooling channels branch off, increases over its length and the cross section of the outflow channel, to which the cooling channels lead, decreases over its length. This causes a pressure equalization over the entire two-dimensional cooling device and leads to a uniform cooling effect over the entire two-dimensional LED array. As a result, all LEDs of the entire array can be kept at the same, predetermined temperature and a temperature gradient over the array can be avoided.
    In one embodiment of the invention, the inflow and outflow channel of the cooling system of the LED array are each conical in the region of the branches and inlets of the cooling channels.
    In one embodiment of the invention, the cooling system of the LED array has a temperature sensor which is connected to a controller of the cooling fluid pump. This enables control of the pump output according to the temperature of the cooling fluid and thus the achievable temperature of the LED array.
    In one embodiment of the invention, the cooling system is filled with a cooling fluid with water mixed with glycol. Such a cooling fluid is not abrasive and as such also serves as a lubricant for the pump.
    In a further embodiment of the invention, the cooling system of the LED array has an expansion vessel.
    Further advantages and features of the invention follow from the following description, in which the invention is explained in more detail with reference to an embodiment shown in the schematic drawings.
    CH 712 769 A2
    Brief Description of the Figures [0014]
    1 shows a top view of a two-dimensional LED array according to the invention with a schematic representation of the cooling system.
    FIG. 2 shows a side cross-sectional view of the LED array with cooling system according to II-II in FIG. 1.
    Fig. 3 is a view of the cooling system of the LED array according to section III-III in Fig. 2, in particular the two-dimensionally arranged cooling channels.
    4a, 4b show a cross section of the inflow and outflow channels according to IVa-IVa and IVb-IVb in FIG. 3.
    In the figures, the same reference numerals have been used for the same elements, and first-time explanations apply to all figures, unless expressly stated otherwise.
    Exemplary embodiments of the invention [0015] FIG. 1 shows an example of the LED lighting system L according to the invention. A plurality of LEDs 2, which are connected to a closed cooling circuit system 3, are arranged in a two-dimensional array on the top side 1a of a circuit board 1. On the back of the circuit board 1, which faces away from the top 1a with the LEDs 2, a system of cooling channels is arranged, which are connected to an inflow channel 4 and an outflow channel 5. A cooling fluid is cooled by means of a cooler 6 and circulated in the direction indicated by arrows by means of a pump 7, the cooling fluid cooling the LEDs to a predetermined temperature as they flow through the system of cooling channels. In a line 8, which leads the cooling fluid from the pump 7 to the inlet channel 4, an expansion vessel 9 is also arranged to compensate for any excess pressure. A temperature sensor 10 is also arranged in the cooling fluid line in order to monitor the temperature of the cooling fluid. A signal line 11 and a control unit serve to control the cooling capacity of the cooler 6 and to set the cooling fluid temperature. The control device enables the temperature of the cooling fluid to be adjusted accordingly in accordance with the cooling fluid temperature measured by the temperature sensor 10, in order to ensure that a predetermined maximum temperature of the LED array is not exceeded.
    Fig. 2 shows the LED board 1 from the side with an upper side 1a with the LEDs arranged LEDs and in particular the arrangement of the inflow channel 4, the outflow channel 5 and cooling channels 13 on the lower side of the board facing away from the LEDs. 3 shows the arrangement of the cooling channels 13 on the rear side of the circuit board 1. These lead from the inlet channel 4 to the outlet channel 5 and are arranged parallel to one another in such a way that their arrangement corresponds to the arrangement of the rows of the two-dimensional array of LEDs and the cooling channels 13 thereby directly under the LEDs and thus as close as possible to the LEDs in order to cool them as efficiently as possible. In the exemplary embodiment shown, the cooling channels 13 each have cross sections of the same size.
    4a and 4b show the inflow channel 4 and outflow channel 5 in longitudinal cross section. The inflow and outflow channels are conical in the example shown. The cross section of the inflow channel 4 increases in the direction of flow of the cooling fluid indicated by an arrow and over the area 4a in which the parallel cooling channels branch off from the inflow channel (FIG. 4a). The cross section 4 'of the inflow channel when it acts on the circuit board is smaller than the cross section 4 at the end of the channel 4a.
    The cross section of the drainage channel 5, on the other hand, decreases in the direction of flow of the cooling fluid in the area 5a, in which the cooling channels 13 running in parallel lead into it (FIG. 4b). The cross section 5 at the outlet from the circuit board is larger than the cross section 5 'at the other end of the channel 5a. The changing cross-sections of the channels 4a and 5a have the effect that the cooling fluid pressure in each of the cooling channels 13 running parallel to one another remains the same and the cooling capacity is therefore the same in all areas of the LED array. This ensures that the performance and operating time of all elements of the LED array remain the same.
    Reference symbol list [0018]
    circuit board
    LEDs
    cooling system
    inlet channel
    4a area of the inflow duct from which the cooling ducts branch off
    Drain channel to which cooling channels 13 lead
    CH 712 769 A2
    5a area of the drainage channel
    4 ', 4 cross section of the inflow channel 4 in the area 4a 5', 5 cross section of the outflow channel 5 in the area 5a
    cooler
    pump
    Cooling fluid line
    expansion tank
    temperature sensor
    control unit
    signal line
    cooling channels
    L LED lighting
    权利要求:
    Claims (5)
    [1]
    claims
    1. An LED lighting system (L) has a plurality of LEDs (2) which are arranged in a two-dimensional array on a circuit board (1), the circuit board (1) being connected to a cooling system (3), characterized in that that the cooling system (3) has a plurality of cooling channels (13) for a cooling fluid, which extend over the back of the circuit board (1), which faces away from the LEDs (2), the cooling channels (13) corresponding to the arrangement of the LEDs (2) and immediately below the LEDs (2) are arranged, and the cooling channels (13) are connected to an inflow channel (4) and an outflow channel (5) and the cooling channels (13) branch off from the inflow channel (4) in parallel and lead to the drain channel (5), and the inflow and outflow channel (4, 5) are connected to a cooler (6) and a pump (7), and wherein the inflow channel (4) in an area (4a) in which the Branch a plurality of cooling ducts (13) running in parallel over its length has an increasing cross-section in the direction of flow of the cooling fluid and the drainage channel (5) has a cross-section which decreases over its length in the direction of flow of the cooling fluid in a region (5a) in which the plurality of cooling ducts (13) which run parallel to it.
    [2]
    2. LED lighting system (L) according to claim 1, characterized in that the inflow channel (4) and the outflow channel (5) of the cooling system (3) are conical.
    [3]
    3. LED lighting system (L) according to claim 1 or 2, characterized in that the cooling system (3) has a temperature sensor (10) which is connected to a control unit (11) for the pump (7).
    [4]
    4. LED lighting system (L) according to one of claims 1 to 3, characterized in that the cooling system (3) is filled with a cooling fluid with water mixed with glycol.
    [5]
    5. LED lighting system (L) according to one of claims 1 to 4, characterized in that the cooling system (3) has an expansion vessel (9).
    CH 712 769 A2
    类似技术:
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    DE1652563B2|1977-07-07|DEVICE FOR COOLING OR COOLING LUBRICATION A ROLLER
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    同族专利:
    公开号 | 公开日
    EP3276258A1|2018-01-31|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    TWI417604B|2005-12-28|2013-12-01|Semiconductor Energy Lab|Display device|
    US7753568B2|2007-01-23|2010-07-13|Foxconn Technology Co., Ltd.|Light-emitting diode assembly and method of fabrication|
    DE202014100528U1|2014-02-06|2014-04-08|Sebastian Jansen|aquarium lighting|IT201800009625A1|2018-10-19|2020-04-19|C&E Group Srl|LIGHTING DEVICE|
    法律状态:
    2020-10-15| AZW| Rejection (application)|
    优先权:
    申请号 | 申请日 | 专利标题
    CH9792016|2016-07-27|
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