EP2753877B1 - Led cooling system - Google Patents
Led cooling system Download PDFInfo
- Publication number
- EP2753877B1 EP2753877B1 EP12772163.7A EP12772163A EP2753877B1 EP 2753877 B1 EP2753877 B1 EP 2753877B1 EP 12772163 A EP12772163 A EP 12772163A EP 2753877 B1 EP2753877 B1 EP 2753877B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- airflow
- heat exchanger
- fins
- led array
- array module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000001816 cooling Methods 0.000 title claims description 23
- 238000003491 array Methods 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims 1
- 239000003570 air Substances 0.000 description 16
- 240000005528 Arctium lappa Species 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 210000000887 face Anatomy 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 210000000554 iris Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Images
Classifications
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- 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
- F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
- F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
- F21V29/677—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans the fans being used for discharging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
- F21V29/75—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with fins or blades having different shapes, thicknesses or spacing
-
- 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
- F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
- F21W2131/40—Lighting for industrial, commercial, recreational or military use
- F21W2131/406—Lighting for industrial, commercial, recreational or military use for theatres, stages or film studios
-
- 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 present invention generally relates to an automated luminaire, specifically to luminaires utilizing high intensity LED light source(s). More specifically to system(s) and method(s) for cooling the light source(s).
- Luminaires with automated and remotely controllable functionality are well known in the entertainment and architectural lighting markets. Such products are commonly used in theatres, television studios, concerts, theme parks, nightclubs and other venues.
- a typical product will provide control over the pan and tilt functions of the luminaire allowing the operator to control the direction the luminaire is pointing and thus the position of the light beam on the stage or in the studio. This position control is often done via control of the luminaire's position in two orthogonal rotational axes usually referred to as pan and tilt.
- Many products provide control over other parameters such as the intensity, color, focus, beam size, beam shape and beam pattern.
- the beam pattern is often provided by a stencil or slide called a gobo which may be a steel, aluminum or etched glass pattern.
- the products manufactured by Robe Show Lighting such as the ColorSpot 700E are typical of the art.
- FIG. 1 illustrates a typical multiparameter automated luminaire system 10.
- These systems commonly include a plurality of multiparameter automated luminaires 12 which typically each contain on-board a light source (not shown), light modulation devices, electric motors coupled to mechanical drives systems and control electronics (not shown).
- each luminaire In addition to being connected to mains power either directly or through a power distribution system (not shown), each luminaire is connected in series or in parallel via data link 14 to one or more control desks 15.
- the automated luminaire system 10 is typically controlled by an operator through the control desk 15. Consequently, to affect this control both the control desk 15 and the individual luminaires typically include electronic circuitry as part of the electromechanical control system for controlling the automated lighting parameters.
- FIG. 2 illustrates a prior art automated luminaire 12 utilizing a high intensity discharge (HID) lamp.
- An HID lamp 21 contains an arc or plasma light source 22 which emits light. The emitted light is reflected and controlled by reflector 20 through an aperture or imaging gate 24.
- the resultant light beam may be further constrained, shaped, colored and filtered by optical devices 26 which may include dichroic color filters, dimming shutters, and other optical devices well known in the art.
- the final output beam may be transmitted through output lenses 28 and 31 which may form a zoom lens system.
- Typically luminaires employing a HID type lamp employ a hot mirror 46 which is a window which transmits visible light and reflects non-visible energy radiating energy.
- Such prior art automated luminaires use a variety of technologies as the light sources for the optical system. For example it is well known to use incandescent lamps, high intensity discharge (HID) lamps, plasma lamps and LEDs as light sources in such a luminaire.
- incandescent lamps, high intensity discharge (HID) lamps, plasma lamps and LEDs as light sources in such a luminaire.
- HID high intensity discharge
- WO 2011/076219 A1 discloses an automated luminaire using LED light sources. Many of these light sources need cooling to maintain them within acceptable operating temperature limits.
- Figure 3 illustrates one example of a prior art lamp light source 30 and its major components.
- Lamp 30 may comprise a sealed quartz envelope 37 with two contained electrodes 34 and 35 which are typically manufactured of tungsten. In operation an electrical arc is struck between electrodes 34 and 35 thus creating high temperature plasma and producing light.
- the specific mechanism and chemistry for the light production is beyond the scope of this patent and does not relate to the novelty of the invention.
- the luminaire designer must develop a cooling system which maintains the desired temperatures for the components of lamp 30.
- a further constraint is the need for any cooling systems to avoid interfering with the reflector 31 or with any of the light beams emitted from the lamp or bounced from reflector 31.
- FIG 4 illustrates a further prior art cooling system for an automated luminaire which seeks to maintain correct temperatures of the lamp 30 in particular the lamp envelope 37 and lamp pinches 32 and 33.
- one or more fans 41 are directed into the reflector 31 in such a manner as to direct external cool air around the lamp 30.
- the cooling air may be directed directly on to the lamp as illustrated or may be directed at an angle so as to form a vortex of air around the lamp.
- FIGURES Preferred embodiments of the present invention are illustrated in the FIGURES, like numerals being used to refer to like and corresponding parts of the various drawings.
- the present invention generally relates to an automated luminaires, specifically toluminaires utilizing a high intensity LED light source and the lamp cooling systems contained therein.
- FIG. 5 illustrates an automated luminaire 100 using an embodiment of the invention utilizing a high powered LED array.
- Automated luminaire 100 contains a light source module 102 which emits light through optical devices 150 and 152 which may include gobo wheels, rotating gobo wheels, effects wheels, irises, frost systems, dichroic color filters, dimming shutters, and other optical devices well known in the art.
- the final output beam may be transmitted through output lenses 154 and 156 which may form a zoom lens system.
- Light source module 102 comprises an LED array module 104 with light output aperture 105.
- LED array module 104 is surrounded by a pair of side heat exchanger subsystems: a first side heat exchanger subsystem 106 with associated fins 113 and cooling fan 114, and a second heat exchanger subsystem 116 with associated fins 109 and fan 110.
- FIG 8 also illustrates a combined multi-surface heat exchanger subsystem 107 with associated fins (not shown in Figure 6 ), and fans 108 and 112.
- Fans 108, 110, 112 and 114 may direct air through their associated heat exchanger subsystems.
- Fans 108, 110, 112 and 114 may be low speed fans such that the noise produced is low.
- fans 108, 110, 112 and 114 are positioned such that airflow is directed 140 and 144 into the heat exchanger subsystems 106, 116, 107 which also serve to baffle and attenuate the fan noise.
- the air flow 140, 144 into the heat exchanger subsystems 106, 116 107 results in airflow 142 146 (airflow out of subsytems 116 and 107 not shown in Figure 6 ).
- Figure 7 illustrates one of the side heat exchangers 106 with its fins 113 and fan 104.
- FIG. 8 illustrates an LED array module of an embodiment of the invention.
- LED array module 104 contains high-powered LED arrays and optical combining systems which direct light through light output aperture 105.
- LED arrays may be mounted within LED array module 104 on the internal sides of faces 120, 122, 124, 126 and 128. Faces 120, 122, 124, 126 and 128 are thermally conductive surfaces designed to transfer heat from the internal arrays to the outside of the LED array module from where it is transferred to the heat exchangers.
- FIG 9 is a top view illustration of the airflow 150 generated by fan 114 across one of the fins 113 of the heat exchanger subsystem illustrated in Figure 7 .
- the airflow enters the fins as turbulent 152 and depending on the speed of the fan 114 and volume of airflow 150 the turbulent flow 152 converts to laminar flow 154. Since the fins 113 are tapered at the exit end 151, the air on the tap end 115 begins to curve away from the light source 104 and create a Bernoulli effect 156 158 drawing the air increasingly away from the light source 104.
- the benefits of the turbulence at the entry and at higher speeds is more efficient heat transfer to the air.
- the benefits of the laminar flow at lower speeds is quieter operation.
- the turbulent flow is more efficient the cooling at the light output 105 end 160 of the light source increases the temperature differential at the output side 160 relative to the side 162 closer to the source surface 126 - encouraging wicking of heat in direction 164.
- the efficiency of the turbulent flow may be offset by a greater temperature differential at the side 162 closer to the source surface 126.
- FIG 10 illustrates the heat exchanger system illustrated in Figure 6 with the side heat exchanger subsystems removed - leaving the light source 104 and heat exchanger subsystem 107 including its fans 108 and 112.
- FIG 11 illustrates a heat exchanger of an embodiment of the invention.
- Thermally conductive surfaces 134 are in intimate contact with a thermally conductive surface of the LED array module such as surface 128 of Figure 8 .
- the transferred heat is then transferred into radiant fins 132.
- Radiant fins 132 and thermally conductive surfaces 134 may be constructed of copper, aluminum or other material with high thermal conductivity.
- the radiant fins 132 extend throughout the heat exchanger 140 and include three thermally conductive surfaces, each of which is in contact with a different thermally conductive surface of the LED array module.
- the majority of radiant fins 132 are enclosed by cover 130, with the exception of incoming air apertures for the fans 108 and 112, and exiting air aperture 136.
- Cover 130 thus forms an air duct directing cool ambient air 140 in to the heat exchanger through fans 108 and 112. This air flows over and between the radiant fins 132 constrained by cover 130. Heat is transferred to the air from the radiant fins and finally hot air 142 exits the heat exchanger at 136. Exiting hot air 142 may be directed outside the automated luminaire.
- the ducting of the air from the fans through the ducted heat exchanger serves to both cool the LED module, and baffle and silence the fans.
- a 'C' shaped heat exchanger in contact with three surfaces of the LED module is illustrated here, however the invention is not so limited and any number of surfaces of the LED module may be in contact with the heat exchanger. Although two fans 108 and 112 are illustrated here the invention is not so limited and any number of fans may be utilized.
- Figure 12 illustrates a heat exchanger of an embodiment of the invention with the top and side of the ducting covers removed. It can be seen how the radiant fins 132 extend around the inside of the heat exchanger to provide a large surface area for heat transfer. Heat is transferred from conductive surfaces 134 into the radiant fins 132 as previously described.
- Figure 13 is a top down illustration of the airflow 170 across the fins 132 of the heat exchanger subsystem illustrated in Figure 10 . Higher incidence of turbulent flow areas are illustrated 172 and 174. As are Bernoulli force effects 176 due to the exit flow dynamics at the airflow exit 136.
- the invention is not so limited and the light output from the optical system may be imaging where a focused or defocused image is projected, or non-imaging where a diffuse soft edged light beam is produced, without detracting from the spirit of the invention.
- the invention may be used as an LED array cooling system with optical systems commonly known as spot, wash, beam or other optical systems known in the art.
- the cooling system may be actively controlled using feedback from the lamp control system and temperature probes measuring the ambient temperature in and around the lamp and/or lamp house and controlling the speed of fans 108, 110, 112 and 114 accordingly.
- Separate sensors may be used to sense temperatures at each LED array and/or the LED module and/or other locations inside and outside the luminaire house.
- Such systems may also use the power provided to LED module 104 to control the speed of cooling fans. For example, if the user commands the lamp to dim down to 20% output through the control console and link as shown in Figure 1 then the cooling system may respond to this by reducing fan speeds to a level commensurate with the power level being provided to LED module 140.
- the commensurate level of fan speed is determined as a function of the heat power to heat generation curve of the source taken together with the cooling to fan speed curve(s) of for an internal external temperature differential.
- the fan speed may also be controlled based on the temperature input from the various sensors or the differential of temperatures across sensors.
- the lamp cooling and fan speeds may be controlled through commands received over the communication link 14 shown in Figure 1 .
- commands may be transmitted over protocols including but not limited to industry standard protocols DMX512, RDM, ACN, Artnet, MIDI and/or Ethernet.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Description
- This application is a patent application claiming priority of US provisional patent application(s)
61/531,059 filed 5 September 2011 - The present invention generally relates to an automated luminaire, specifically to luminaires utilizing high intensity LED light source(s). More specifically to system(s) and method(s) for cooling the light source(s).
- Luminaires with automated and remotely controllable functionality are well known in the entertainment and architectural lighting markets. Such products are commonly used in theatres, television studios, concerts, theme parks, nightclubs and other venues. A typical product will provide control over the pan and tilt functions of the luminaire allowing the operator to control the direction the luminaire is pointing and thus the position of the light beam on the stage or in the studio. This position control is often done via control of the luminaire's position in two orthogonal rotational axes usually referred to as pan and tilt. Many products provide control over other parameters such as the intensity, color, focus, beam size, beam shape and beam pattern. The beam pattern is often provided by a stencil or slide called a gobo which may be a steel, aluminum or etched glass pattern. The products manufactured by Robe Show Lighting such as the ColorSpot 700E are typical of the art.
-
Figure 1 illustrates a typical multiparameter automatedluminaire system 10. These systems commonly include a plurality of multiparameterautomated luminaires 12 which typically each contain on-board a light source (not shown), light modulation devices, electric motors coupled to mechanical drives systems and control electronics (not shown). In addition to being connected to mains power either directly or through a power distribution system (not shown), each luminaire is connected in series or in parallel viadata link 14 to one ormore control desks 15. Theautomated luminaire system 10 is typically controlled by an operator through thecontrol desk 15. Consequently, to affect this control both thecontrol desk 15 and the individual luminaires typically include electronic circuitry as part of the electromechanical control system for controlling the automated lighting parameters. -
Figure 2 illustrates a prior artautomated luminaire 12 utilizing a high intensity discharge (HID) lamp. AnHID lamp 21 contains an arc orplasma light source 22 which emits light. The emitted light is reflected and controlled byreflector 20 through an aperture orimaging gate 24. The resultant light beam may be further constrained, shaped, colored and filtered byoptical devices 26 which may include dichroic color filters, dimming shutters, and other optical devices well known in the art. The final output beam may be transmitted throughoutput lenses hot mirror 46 which is a window which transmits visible light and reflects non-visible energy radiating energy. - Such prior art automated luminaires use a variety of technologies as the light sources for the optical system. For example it is well known to use incandescent lamps, high intensity discharge (HID) lamps, plasma lamps and LEDs as light sources in such a luminaire. For example document
WO 2011/076219 A1 discloses an automated luminaire using LED light sources. Many of these light sources need cooling to maintain them within acceptable operating temperature limits.Figure 3 illustrates one example of a prior artlamp light source 30 and its major components.Lamp 30 may comprise a sealedquartz envelope 37 with two containedelectrodes electrodes lamp 30. A further constraint is the need for any cooling systems to avoid interfering with thereflector 31 or with any of the light beams emitted from the lamp or bounced fromreflector 31. -
Figure 4 illustrates a further prior art cooling system for an automated luminaire which seeks to maintain correct temperatures of thelamp 30 in particular thelamp envelope 37 andlamp pinches more fans 41 are directed into thereflector 31 in such a manner as to direct external cool air around thelamp 30. The cooling air may be directed directly on to the lamp as illustrated or may be directed at an angle so as to form a vortex of air around the lamp. - None of these prior art systems work well with a light source comprising an array of high powered LED emitters. Such arrays cover a wide area, rather than the single point light source provided by prior art lamps, and are not contained within a single reflector. Designs using simple fans blowing over the LED arrays may work but are noisy and large.
- There is a need for a cooling system for high powered LED arrays in an automated luminaire which offers improved cooling of such arrays in a compact system with good control of the noise emitted by the cooling system.
- For a more complete understanding of the present invention and the advantages thereof, reference is now made to the following description taken in conjunction with the accompanying drawings in which like reference numerals indicate like features and wherein:
-
- FIGURE 1
- illustrates a typical automated lighting system;
- FIGURE 2
- illustrates a prior art system;
- FIGURE 3
- illustrates a typical prior art lamp cooling system in an automated luminaire;
- FIGURE 4
- illustrates a prior art lamp cooling system;
- FIGURE 5
- illustrates an embodiment of the invention;
- FIGURE 6
- illustrates a perspective view of an embodiment of the invention;
- FIGURE 7
- illustrates a perspective view of one of the two side
heat exchanger subsystems 106 ofFigure 6 ; - FIGURE 8
- illustrates a perspective view of the LED light source of an embodiment off the invention;
- FIGURE 9
- illustrates a top view of the airflow over the top of one of the fins of the side heat exchanger of
Figure 7 ; - FIGURE 10
- illustrates the cooling system illustrated in
Figure 6 with the sideheat exchanger subsystems - FIGURE 11
- illustrates a perspective view of a heat exchanger of an embodiment of the invention;
- FIGURE 12
- illustrates a perspective view of another
heat exchanger subsystem 107 of an embodiment of the invention; and - FIGURE 13
- illustrates a top view of the airflow over the top of one of the fins of the side heat exchanger of
Figure 3 . - Preferred embodiments of the present invention are illustrated in the FIGURES, like numerals being used to refer to like and corresponding parts of the various drawings.
- The present invention generally relates to an automated luminaires, specifically toluminaires utilizing a high intensity LED light source and the lamp cooling systems contained therein.
-
Figure 5 illustrates anautomated luminaire 100 using an embodiment of the invention utilizing a high powered LED array.Automated luminaire 100 contains alight source module 102 which emits light throughoptical devices output lenses -
Figure 6 illustrates an embodiment of the invention.Light source module 102 comprises anLED array module 104 withlight output aperture 105.LED array module 104 is surrounded by a pair of side heat exchanger subsystems: a first sideheat exchanger subsystem 106 with associatedfins 113 and coolingfan 114, and a secondheat exchanger subsystem 116 with associatedfins 109 andfan 110. -
Figure 8 also illustrates a combined multi-surfaceheat exchanger subsystem 107 with associated fins (not shown inFigure 6 ), andfans Fans Fans fans heat exchanger subsystems air flow heat exchanger subsystems airflow 142 146 (airflow out ofsubsytems Figure 6 ). -
Figure 7 illustrates one of theside heat exchangers 106 with itsfins 113 andfan 104. -
Figure 8 illustrates an LED array module of an embodiment of the invention.LED array module 104 contains high-powered LED arrays and optical combining systems which direct light throughlight output aperture 105. LED arrays may be mounted withinLED array module 104 on the internal sides offaces Faces -
Figure 9 is a top view illustration of theairflow 150 generated byfan 114 across one of thefins 113 of the heat exchanger subsystem illustrated inFigure 7 . The airflow enters the fins as turbulent 152 and depending on the speed of thefan 114 and volume ofairflow 150 theturbulent flow 152 converts tolaminar flow 154. Since thefins 113 are tapered at theexit end 151, the air on thetap end 115 begins to curve away from thelight source 104 and create aBernoulli effect 156 158 drawing the air increasingly away from thelight source 104. The benefits of the turbulence at the entry and at higher speeds is more efficient heat transfer to the air. The benefits of the laminar flow at lower speeds is quieter operation. Since the turbulent flow is more efficient the cooling at thelight output 105end 160 of the light source increases the temperature differential at theoutput side 160 relative to theside 162 closer to the source surface 126 - encouraging wicking of heat indirection 164. At the same time depending on operating temperatures the efficiency of the turbulent flow may be offset by a greater temperature differential at theside 162 closer to thesource surface 126. -
Figure 10 illustrates the heat exchanger system illustrated inFigure 6 with the side heat exchanger subsystems removed - leaving thelight source 104 andheat exchanger subsystem 107 including itsfans -
Figure 11 illustrates a heat exchanger of an embodiment of the invention. Thermallyconductive surfaces 134 are in intimate contact with a thermally conductive surface of the LED array module such assurface 128 ofFigure 8 . The transferred heat is then transferred intoradiant fins 132.Radiant fins 132 and thermallyconductive surfaces 134 may be constructed of copper, aluminum or other material with high thermal conductivity. In the example shown inFigure 8 , theradiant fins 132 extend throughout theheat exchanger 140 and include three thermally conductive surfaces, each of which is in contact with a different thermally conductive surface of the LED array module. The majority ofradiant fins 132 are enclosed bycover 130, with the exception of incoming air apertures for thefans air aperture 136. Cover 130 thus forms an air duct directing coolambient air 140 in to the heat exchanger throughfans radiant fins 132 constrained bycover 130. Heat is transferred to the air from the radiant fins and finallyhot air 142 exits the heat exchanger at 136. Exitinghot air 142 may be directed outside the automated luminaire. The ducting of the air from the fans through the ducted heat exchanger serves to both cool the LED module, and baffle and silence the fans. - A 'C' shaped heat exchanger in contact with three surfaces of the LED module is illustrated here, however the invention is not so limited and any number of surfaces of the LED module may be in contact with the heat exchanger. Although two
fans -
Figure 12 illustrates a heat exchanger of an embodiment of the invention with the top and side of the ducting covers removed. It can be seen how theradiant fins 132 extend around the inside of the heat exchanger to provide a large surface area for heat transfer. Heat is transferred fromconductive surfaces 134 into theradiant fins 132 as previously described. -
Figure 13 is a top down illustration of theairflow 170 across thefins 132 of the heat exchanger subsystem illustrated inFigure 10 . Higher incidence of turbulent flow areas are illustrated 172 and 174. As areBernoulli force effects 176 due to the exit flow dynamics at theairflow exit 136. - Although the figures shown here are of embodiments with imaging optics that are capable of producing projected images from gobo wheels and other pattern producing optical devices, the invention is not so limited and the light output from the optical system may be imaging where a focused or defocused image is projected, or non-imaging where a diffuse soft edged light beam is produced, without detracting from the spirit of the invention. The invention may be used as an LED array cooling system with optical systems commonly known as spot, wash, beam or other optical systems known in the art.
- In yet further embodiments, the cooling system may be actively controlled using feedback from the lamp control system and temperature probes measuring the ambient temperature in and around the lamp and/or lamp house and controlling the speed of
fans LED module 104 to control the speed of cooling fans. For example, if the user commands the lamp to dim down to 20% output through the control console and link as shown inFigure 1 then the cooling system may respond to this by reducing fan speeds to a level commensurate with the power level being provided toLED module 140. The commensurate level of fan speed is determined as a function of the heat power to heat generation curve of the source taken together with the cooling to fan speed curve(s) of for an internal external temperature differential. The fan speed may also be controlled based on the temperature input from the various sensors or the differential of temperatures across sensors. - In other embodiments the lamp cooling and fan speeds may be controlled through commands received over the
communication link 14 shown inFigure 1 . Such commands may be transmitted over protocols including but not limited to industry standard protocols DMX512, RDM, ACN, Artnet, MIDI and/or Ethernet.
Claims (4)
- A luminaire comprising:an LED array module (104) which generates light and heat;one or more heat exchangers (106, 107, 116) comprising fins (113, 132), each heat exchanger having an airflow input adjacent an LED array module (104) to be cooled and an airflow exit (151, 136) and wherein each heat exchanger is tapered from the airflow input to the airflow exit (151);one or more fans (108, 110, 112, 114) adapted to drive an airflow (140-154, 170) across one of the fins; andwherein said fan (114), heat exchanger (106, 107, 116), and fins (113) are configured such that the fan (114) generates an airflow that enters the airflow input of a heat exchanger as turbulent flow (152, 172, 174) and is converted to laminar flow (154) at the airflow exit (151, 136), the turbulent flow (152, 172, 174) providing increased cooling efficiency near the airflow input and the laminar flow (154) providing decreased airflow noise at the airflow exit (151, 136).
- The luminaire of claim 1 wherein the LED array module comprises a plurality of LED arrays and optical combining systems which direct light through a light output aperture (105).
- The luminaire of claim 2 wherein the LED arrays are mounted on internal sides of surfaces (120, 122, 124, 126) of the LED array module (104), the surfaces being thermally conductive to transfer heat from the internally mounted LED arrays to the outside of the LED array module for transfer to the airflow input of fins of the one or more heat exchangers (106, 107, 116) by one or more fans (108, 110, 112, 114), wherein the ducting of the air from the fans through the one or more heat exchangers cools the LED arrays.
- The luminaire of any preceding claim further wherein each heat exchanger is configured such that the airflow passing through the fin (113) curves away from the LED array module (104) creating a Bernoulli effect (156, 158) due to exit flow dynamics at the airflow exit (151, 136).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201161531059P | 2011-09-05 | 2011-09-05 | |
PCT/US2012/053805 WO2013036538A1 (en) | 2011-09-05 | 2012-09-05 | Led cooling system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2753877A1 EP2753877A1 (en) | 2014-07-16 |
EP2753877B1 true EP2753877B1 (en) | 2020-11-04 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP12772163.7A Active EP2753877B1 (en) | 2011-09-05 | 2012-09-05 | Led cooling system |
Country Status (3)
Country | Link |
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EP (1) | EP2753877B1 (en) |
CN (1) | CN103890489A (en) |
WO (1) | WO2013036538A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2927579B1 (en) * | 2014-04-04 | 2020-02-12 | Harman Professional Denmark ApS | Cooling module for led light fixture |
US10422520B2 (en) | 2014-10-01 | 2019-09-24 | Robe Lighting S.R.O. | Lamp color temperature stability in an automated luminaire |
CN105333408B (en) * | 2015-12-03 | 2019-02-19 | 广州市浩洋电子股份有限公司 | A kind of light of stage source module thermal system |
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CN107959869B (en) * | 2017-12-05 | 2020-07-21 | 北海华源电子有限公司 | Flat-panel television with set top box protective cover convenient for heat dissipation |
CN109634043B (en) * | 2019-02-22 | 2020-08-28 | 中国科学院福建物质结构研究所 | Laser emission unit and laser projection light source |
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DE102007043961C5 (en) * | 2007-09-14 | 2017-04-06 | Automotive Lighting Reutlingen Gmbh | Illuminating device with semiconductor light source |
CN101970935B (en) * | 2007-12-07 | 2014-07-23 | 奥斯兰姆有限公司 | Heat sink and lighting device comprising a heat sink |
TW201116982A (en) * | 2009-11-13 | 2011-05-16 | Sunonwealth Electr Mach Ind Co | Cooling module |
WO2011076219A1 (en) * | 2009-12-21 | 2011-06-30 | Martin Professional A/S | Cooling module for multiple light source projecting device |
EP2339234A1 (en) * | 2009-12-23 | 2011-06-29 | Micronel AG | Cooling device |
DE202011000220U1 (en) * | 2011-01-28 | 2011-04-07 | Keiling, Ulf | LED light, especially for aquariums, terrariums or the like |
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2012
- 2012-09-05 EP EP12772163.7A patent/EP2753877B1/en active Active
- 2012-09-05 CN CN201280051970.3A patent/CN103890489A/en active Pending
- 2012-09-05 WO PCT/US2012/053805 patent/WO2013036538A1/en active Application Filing
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EP2753877A1 (en) | 2014-07-16 |
WO2013036538A1 (en) | 2013-03-14 |
CN103890489A (en) | 2014-06-25 |
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