US20030155110A1 - Advanced air cooled heat sink - Google Patents
Advanced air cooled heat sink Download PDFInfo
- Publication number
- US20030155110A1 US20030155110A1 US10/078,942 US7894202A US2003155110A1 US 20030155110 A1 US20030155110 A1 US 20030155110A1 US 7894202 A US7894202 A US 7894202A US 2003155110 A1 US2003155110 A1 US 2003155110A1
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- louvers
- heat sink
- base plate
- forming
- louver
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/367—Cooling facilitated by shape of device
- H01L23/3672—Foil-like cooling fins or heat sinks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
- F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements
- F28F3/027—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements with openings, e.g. louvered corrugated fins; Assemblies of corrugated strips
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention is directed to heat sinks in general, and more particularly to heat sinks for use in dissipating waste heat generated by electrical or electronic components and assemblies.
- FIG. 1 One type of prior art heat sink for electrical or electronic components is illustrated in FIG. 1 and shown generally at 10 .
- Heat sink 10 employs a base plate 12 that has a bottom surface 16 to which the electrical device is attached and a top surface 14 to which a folded fin 18 is attached.
- Folded fin 18 can be formed from a continuous strip of metal in an accordion-style such that there are alternating convoluted portions 20 and planar portions 22 .
- the folded fin 18 is placed on top surface 14 of base plate 12 such that convoluted portions 20 on one side of fin 18 are abutted to top surface 14 of the base plate 12 , and then typically affixed to the base plate by brazing, soldering, or other manner of affixing to enhance the heat flow from base plate 12 to folded fin 18 .
- An electric fan is then placed in proximity to one side of the heat sink and air is either drawn or blown through the passages 24 formed by the fins and convolutions.
- the heat sink comprises a base plate having a top surface and having a bottom surface for attaching to the electronic device.
- a folded fin formed from a strip of heat conducting material comprising alternating planar portions and curved portions has one edge abutted to the top surface such that the curved portions extend upwardly from the top surface substantially at a right angle.
- Each planar portion has a plurality of louvers formed therein wherein the louvers are substantially parallel one to the other and perpendicular to the base plate.
- Another aspect of the present invention is a method of fabricating a heat sink for electrical or electronic devices.
- the method comprising the steps of providing a base plate having a top surface and a bottom surface.
- a folded fin is formed from a strip of heat conductive material wherein the folded fin has a plurality of alternating curved portions and planar portions.
- a plurality of louvers is formed in each of the planar portions such that the louvers are aligned substantially parallel to the curved portions.
- One edge of the folded fin is affixed to the base plate such that the curved portions and planar portions are substantially perpendicular to the top surface of the base plate.
- FIG. 1 is a perspective view of a prior art heat sink, wherein the folds of the folded fin are abutted to a top surface of the base plate.
- FIG. 2 is a perspective view of a heat sink embodying the present invention, wherein a louvered folded fin is mounted to a top surface of the base plate.
- FIG. 3 is a plan view of the louvered fin shown in FIG. 2 illustrating the angulation of the louvers.
- FIG. 4 is a partial cross-sectional view of the louver formed in the bend radius of the folded fin wherein the louver is bent away from the folded fin.
- FIG. 5 is alternate embodiment of the heat sink of FIG. 4 wherein the louver in the bend radius is bent to the inside of the folded fin.
- FIG. 6 is a perspective view of an alternate embodiment heat sink wherein the louvers are formed parallel with the base plate.
- FIG. 7 is a perspective view of an alternate embodiment heat sink wherein the louvers are angularly oriented with respect to the base plate.
- FIGS. 2 - 4 show a heat sink 30 , which is one of the preferred embodiments of the present invention and illustrates its various components.
- Heat sink 30 comprises a base plate 32 have a bottom surface 36 to which an electronic or electrical device (not shown) is to be affixed utilizing a ‘thermal grease’ to enhance thermal conductivity between the device and base plate 36 .
- the manner and method of attaching an electrical device to the base plate is well known in the art and therefore is not described in further detail herein.
- a top surface 34 of base plate 32 has mounted thereon a folded fin 40 .
- Folded fin 40 is formed from a strip of heat conductive material such as aluminum, copper, graphite, aluminum nitride ceramic, or other similar material. Folded fin 40 has a plurality of alternating planar portions 42 and curved portions 44 to form a substantially convoluted accordion-style fin. The folded fin 40 is placed on an edge 46 and abutted to top surface 34 such that the curved portions 44 are substantially perpendicular to and extend upwardly from top surface 34 of base plate 32 . The edge 46 of folded fin 40 abutting top surface 34 can be affixed thereto by bonding metallurgically or with a thermally conductive adhesive to insure a heat conductive path from base plate 32 to folded fin 40 .
- folded fin 40 includes a plurality of louvers 50 formed in each of planar portions 42 . Cutting slits on each side of the louver and then bending the louver about a longitudinal axis forms louvers 50 . Each louver 50 is bent out of the plane of planar portion 42 so that it is angular thereto, thus forming air passageways 52 on either side of each louver 50 .
- louvers 50 are all substantially parallel one to the other, but those skilled in the art will readily recognize that the angular arrangement of louvers 50 can be varied to produce a variety of desired airflow patterns between and among the various planar portions 42 .
- Louvers 50 are oriented substantially parallel to the bend axis of curved portions 44 so that the longitudinal axis of each louver 50 is also substantially perpendicular to top surface 34 of base plate 32 . Forming louvers 50 in such a manner does not remove any material from fin 40 , which is critical to maximizing its heat transfer capabilities. Further, orienting louvers 50 such that their longitudinal direction is substantially perpendicular to top surface 34 facilitates the heat flow from base plate 32 towards the upper portion of folded fin 40 . Louvers 50 are so oriented in anticipation of receiving an airflow thereacross according to airflow directional arrow 54 or 56 . Thus, louvers 50 are oriented substantially transverse to airflow 54 or 56 . The narrow width of louvers 50 facilitate the convection of heat from the louvers 50 to the air moving across the louvers.
- curved portions 44 can greatly hinder or block desired airflow in one directing between adjacent planar portions 42 .
- an end louver 48 is formed in each curved portion 44 of folded fin 40 .
- End louver 48 is formed as a door-like flap by one longitudinal cut along curved portion 44 and adjoining transverse cuts at each end thereof. Louver 48 is then bent outwardly away from folded fin 40 to define an air passageway 49 thereby permitting a cross-flow of air between each adjacent pair of planar portions 42 .
- an alternate embodiment folded fin 140 has a curved portion 144 connecting adjoining planar portions 142 .
- Planar portions 142 each have a plurality of louvers 150 formed therein defining air passageways 152 as discussed above and has an end louver 148 formed at each curved portion 144 .
- End louver 148 is also formed as a door-like flap by one longitudinal cut along curved portion 44 and adjoining transverse cuts at each end thereof.
- louver 148 is bent inwardly between adjacent planar portions 142 to open end passageway 149 to permit the cross-flow of air between each adjacent pair of planar portions 142 .
- each louver 50 As air passes between adjacent planar portions 42 , a leading edge of each louver 50 causes a portion of the airflow to be directed across the width of each louver 50 and into the adjoining space between planar portions 42 . Since the width of each louver 50 is relatively small, only a small thermal boundary layer forms therealong and upon passing over a trailing edge of the louver 50 , the airflow becomes turbulent thereby causing a greater volume of air to come in contact with louvers 50 .
- louvers 50 substantially transverse to airflow 54 or 56 in combination with the formation of end louvers 48 defining end passageways 49 to facilitate the flow of air between adjacent planar portions 42 thus enhances the convection of heat from louvers 50 to the airflow stream thereby transferring heat away from the electronic device desiring to be cooled.
- FIG. 6 an alternate embodiment heat sink 230 is illustrated wherein like elements to heat sink 30 as described above are identified with like numerals preceded by the numeral ‘2’.
- louvers 250 in planar portions 242 are oriented substantially parallel to top surface 234 of base plate 232 .
- Heat sink 230 including louvers 250 oriented in such a manner is in contemplation of a primary airflow therethrough flowing normal to top surface 234 , and thus maintaining the transverse relationship of louvers 250 to the airflow direction 254 or 256 .
- FIG. 7 illustrates yet another embodiment heat sink 330 wherein like elements to heat sink 30 as described above are identified with like numerals preceded by the numeral ‘3’.
- louvers 350 in planar portions 342 are angularly oriented with respect to top surface 334 of base plate 332 .
- Heat sink 330 including angularly oriented louvers 350 contemplates an angular airflow 354 such that louvers 350 are substantially transverse to airflow 354 or 356 .
Abstract
A heat sink for cooling electrical or electronic devices comprises a base plate having a top surface and having a bottom surface for attaching to the electronic device. A folded fin formed from a strip of heat conducting material includes alternating planar portions and curved portions has one edge abutted to the top surface such that the curved portions extend upwardly from the top surface substantially at a right angle. Each planar portion has a plurality of louvers formed therein wherein the louvers are substantially parallel one to the other and perpendicular to the base plate.
Description
- The present invention is directed to heat sinks in general, and more particularly to heat sinks for use in dissipating waste heat generated by electrical or electronic components and assemblies.
- High power electrical and electronic components continue to have an increasing demand for higher power dissipation within a relatively confined space. In order to provide for such higher power dissipation requirements while remaining suitably compact, several levels of thermal management are usually required at the device, sub-assembly and component level.
- At the component level, various types of heat exchangers and heat sinks have been used that apply natural or forced convection or other cooling methods. One type of prior art heat sink for electrical or electronic components is illustrated in FIG. 1 and shown generally at10.
Heat sink 10 employs abase plate 12 that has abottom surface 16 to which the electrical device is attached and atop surface 14 to which a foldedfin 18 is attached. Foldedfin 18 can be formed from a continuous strip of metal in an accordion-style such that there are alternating convolutedportions 20 andplanar portions 22. The foldedfin 18 is placed ontop surface 14 ofbase plate 12 such that convolutedportions 20 on one side offin 18 are abutted totop surface 14 of thebase plate 12, and then typically affixed to the base plate by brazing, soldering, or other manner of affixing to enhance the heat flow frombase plate 12 to foldedfin 18. An electric fan is then placed in proximity to one side of the heat sink and air is either drawn or blown through thepassages 24 formed by the fins and convolutions. - There are certain inefficiencies associated with this type of design, the primary inefficiency being that the airflow does not necessarily contact all flat surfaces of the folded fin. Thus a folded fin heat sink is desired that is easy to fabricate and assemble while also provided for improved airflow and thermal conductivity away from the electrical or electronic device being cool.
- One aspect of the present invention is a heat sink for cooling electrical or electronic devices. The heat sink comprises a base plate having a top surface and having a bottom surface for attaching to the electronic device. A folded fin formed from a strip of heat conducting material comprising alternating planar portions and curved portions has one edge abutted to the top surface such that the curved portions extend upwardly from the top surface substantially at a right angle. Each planar portion has a plurality of louvers formed therein wherein the louvers are substantially parallel one to the other and perpendicular to the base plate.
- Another aspect of the present invention is a method of fabricating a heat sink for electrical or electronic devices. The method comprising the steps of providing a base plate having a top surface and a bottom surface. A folded fin is formed from a strip of heat conductive material wherein the folded fin has a plurality of alternating curved portions and planar portions. A plurality of louvers is formed in each of the planar portions such that the louvers are aligned substantially parallel to the curved portions. One edge of the folded fin is affixed to the base plate such that the curved portions and planar portions are substantially perpendicular to the top surface of the base plate.
- These and other advantages of the invention will be further understood and appreciated by those skilled in the art by reference to the following written specification, claims and appended drawings.
- FIG. 1 is a perspective view of a prior art heat sink, wherein the folds of the folded fin are abutted to a top surface of the base plate.
- FIG. 2 is a perspective view of a heat sink embodying the present invention, wherein a louvered folded fin is mounted to a top surface of the base plate.
- FIG. 3 is a plan view of the louvered fin shown in FIG. 2 illustrating the angulation of the louvers.
- FIG. 4 is a partial cross-sectional view of the louver formed in the bend radius of the folded fin wherein the louver is bent away from the folded fin.
- FIG. 5 is alternate embodiment of the heat sink of FIG. 4 wherein the louver in the bend radius is bent to the inside of the folded fin.
- FIG. 6 is a perspective view of an alternate embodiment heat sink wherein the louvers are formed parallel with the base plate.
- FIG. 7 is a perspective view of an alternate embodiment heat sink wherein the louvers are angularly oriented with respect to the base plate.
- For purposes of description herein, the terms “upper”, “lower”, “left”, “rear”, “right”, “front”, “vertical”, “horizontal”, and derivatives thereof shall relate to the invention as oriented in FIG. 2. However, it is to be understood that the invention may assume various alternative orientations and step sequences, except where expressly specified to the contrary. It is also to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification, are simply exemplary embodiments of the inventive concepts defined in the appended claims. Hence, specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting, unless the claims expressly state otherwise.
- Turning to the drawings, FIGS.2-4 show a
heat sink 30, which is one of the preferred embodiments of the present invention and illustrates its various components. -
Heat sink 30 comprises abase plate 32 have abottom surface 36 to which an electronic or electrical device (not shown) is to be affixed utilizing a ‘thermal grease’ to enhance thermal conductivity between the device andbase plate 36. The manner and method of attaching an electrical device to the base plate is well known in the art and therefore is not described in further detail herein. Atop surface 34 ofbase plate 32 has mounted thereon a foldedfin 40. - Folded
fin 40 is formed from a strip of heat conductive material such as aluminum, copper, graphite, aluminum nitride ceramic, or other similar material. Foldedfin 40 has a plurality of alternatingplanar portions 42 andcurved portions 44 to form a substantially convoluted accordion-style fin. The foldedfin 40 is placed on anedge 46 and abutted totop surface 34 such that thecurved portions 44 are substantially perpendicular to and extend upwardly fromtop surface 34 ofbase plate 32. Theedge 46 of foldedfin 40 abuttingtop surface 34 can be affixed thereto by bonding metallurgically or with a thermally conductive adhesive to insure a heat conductive path frombase plate 32 to foldedfin 40. - As further illustrated in FIGS.2-4, folded
fin 40 includes a plurality oflouvers 50 formed in each ofplanar portions 42. Cutting slits on each side of the louver and then bending the louver about a longitudinal axis formslouvers 50. Eachlouver 50 is bent out of the plane ofplanar portion 42 so that it is angular thereto, thus formingair passageways 52 on either side of eachlouver 50. In the preferred embodiment,louvers 50 are all substantially parallel one to the other, but those skilled in the art will readily recognize that the angular arrangement oflouvers 50 can be varied to produce a variety of desired airflow patterns between and among the variousplanar portions 42. -
Louvers 50 are oriented substantially parallel to the bend axis ofcurved portions 44 so that the longitudinal axis of eachlouver 50 is also substantially perpendicular totop surface 34 ofbase plate 32. Forminglouvers 50 in such a manner does not remove any material fromfin 40, which is critical to maximizing its heat transfer capabilities. Further, orientinglouvers 50 such that their longitudinal direction is substantially perpendicular totop surface 34 facilitates the heat flow frombase plate 32 towards the upper portion of foldedfin 40. Louvers 50 are so oriented in anticipation of receiving an airflow thereacross according to airflowdirectional arrow louvers 50 are oriented substantially transverse toairflow louvers 50 facilitate the convection of heat from thelouvers 50 to the air moving across the louvers. - As is evident by the orientation of the
curved portions 44 being perpendicular tobase plate 32,curved portions 44 can greatly hinder or block desired airflow in one directing between adjacentplanar portions 42. Thus, as most clearly illustrated in FIG. 4, anend louver 48 is formed in eachcurved portion 44 of foldedfin 40.End louver 48 is formed as a door-like flap by one longitudinal cut alongcurved portion 44 and adjoining transverse cuts at each end thereof. Louver 48 is then bent outwardly away from foldedfin 40 to define anair passageway 49 thereby permitting a cross-flow of air between each adjacent pair ofplanar portions 42. - As illustrated in FIG. 5, an alternate embodiment folded
fin 140 has acurved portion 144 connecting adjoiningplanar portions 142.Planar portions 142 each have a plurality oflouvers 150 formed therein definingair passageways 152 as discussed above and has anend louver 148 formed at eachcurved portion 144.End louver 148 is also formed as a door-like flap by one longitudinal cut alongcurved portion 44 and adjoining transverse cuts at each end thereof. However in this embodiment,louver 148 is bent inwardly between adjacentplanar portions 142 toopen end passageway 149 to permit the cross-flow of air between each adjacent pair ofplanar portions 142. - In operation, as the electronic or electrical device generates heat, the heat is transferred to and dispersed throughout the various regions of
base plate 32. As a result of the adhesive or metallurgical bonding of foldedfin 40 tobase plate 32, the heat is also transferred to the areas ofplanar portions 42 andcurved portions 44 immediately adjacent tobase plate 32. The heat is conducted upwardly away frombase plate 32 by foldedfin 40 along eachindividual louver 50. Air is then caused to pass between adjacentplanar portions 42 and throughend passageways 49 in either direction as indicated byairflow direction - As air passes between adjacent
planar portions 42, a leading edge of eachlouver 50 causes a portion of the airflow to be directed across the width of eachlouver 50 and into the adjoining space betweenplanar portions 42. Since the width of eachlouver 50 is relatively small, only a small thermal boundary layer forms therealong and upon passing over a trailing edge of thelouver 50, the airflow becomes turbulent thereby causing a greater volume of air to come in contact withlouvers 50. The combination of relatively long andnarrow louvers 50 substantially transverse to airflow 54 or 56 in combination with the formation ofend louvers 48defining end passageways 49 to facilitate the flow of air between adjacentplanar portions 42 thus enhances the convection of heat fromlouvers 50 to the airflow stream thereby transferring heat away from the electronic device desiring to be cooled. - Referring now to FIG. 6, an alternate
embodiment heat sink 230 is illustrated wherein like elements toheat sink 30 as described above are identified with like numerals preceded by the numeral ‘2’. In this embodiment,louvers 250 inplanar portions 242 are oriented substantially parallel totop surface 234 ofbase plate 232.Heat sink 230 includinglouvers 250 oriented in such a manner is in contemplation of a primary airflow therethrough flowing normal totop surface 234, and thus maintaining the transverse relationship oflouvers 250 to theairflow direction - FIG. 7 illustrates yet another
embodiment heat sink 330 wherein like elements toheat sink 30 as described above are identified with like numerals preceded by the numeral ‘3’. In this embodiment,louvers 350 inplanar portions 342 are angularly oriented with respect totop surface 334 ofbase plate 332.Heat sink 330 including angularly orientedlouvers 350 contemplates anangular airflow 354 such thatlouvers 350 are substantially transverse to airflow 354 or 356. - In the foregoing description those skilled in the art will readily appreciate that modifications may be made to the invention without departing from the concepts disclosed herein. Such modifications are to be considered as included in the following claims, unless these claims expressly state otherwise.
Claims (20)
1. A heat sink for cooling electrical or electronic devices, said heat sink comprising:
a base plate having a top surface and having a bottom surface for attaching to the electronic device; and
a folded fin formed from a strip of heat conducting material, said folded fin further comprising alternating planar portions and curved portions, wherein said folded fin has one edge abutted to said top surface such that said curved portions extend upwardly from said top surface substantially at a right angle, each said planar portion having a plurality of louvers formed therein, said louvers being substantially parallel one to the other and perpendicular to said base plate.
2. The heat sink according to claim 1 wherein each louver of said plurality of louvers has a longitudinal length substantially parallel to said curved portions and much greater than a width of the louver.
3. The heat sink according to claim 1 wherein each said curved portion includes an end louver formed therein, said end louver formed as a door-like flap folded to extend exteriorly of said curved portion and defining an end passageway therethrough.
4. The heat sink according to claim 3 wherein said fold of said door-like flap is parallel to said curved portion.
5. The heat sink according to claim 1 wherein each said curved portion includes an end louver formed therein, said end louver formed as a door-like flap folded to extend interiorly of said curved portion and defining an end passageway therethrough.
6. The heat sink according to claim 5 wherein said fold of said door-like flap is parallel to said curved portion.
7. The heat sink according to claim 1 wherein said louvers in said planar portions are angled at other than a right angle with respect to a plane of said planar portions.
8. The heat sink according to claim 1 wherein said planar portions are affixed to said base plate by metallurgically bonding.
9. The heat sink according to claim 1 wherein said planar portions are affixed to said base plate by adhesively bonding.
10. The heat sink according to claim 1 wherein said louvers in said planar portions are oriented substantially parallel to said base plate.
11. The heat sink according to claim 1 wherein said louvers in said planar portions are angularly oriented with respect to said base plate.
12. A method of fabricating a heat sink for electrical or electronic devices, said method comprising the steps of:
providing a base plate having a top surface and a bottom surface;
forming a folded fin from a strip of heat conductive material wherein the fin has a plurality of alternating curved portions and planar portions;
forming a plurality of louvers in each of the planar portions such that the louvers are aligned substantially parallel to the curved portions; and
affixing one edge of the folded fin to the base plate such that the curved portions and planar portions are substantially perpendicular to the top surface of the base plate.
13. The method according to claim 12 including after said step of forming a plurality of louvers, the step of forming an end louver as a door-like flap in each of the curved portions and folding the door-like flap to extend exteriorly of the curved portion.
14. The method according to claim 13 wherein said step of forming a plurality of louvers and said step of forming an end louver are performed in the strip of heat conductive material prior to said step of forming a folded fin.
15. The method according to claim 12 including after said step of forming a plurality of louvers, the step of forming an end louver as a door-like flap in each of the curved portions and folding the door-like flap to extend interiorly of the curved portion.
16. The method according to claim 15 wherein said step of forming a plurality of louvers and said step of forming an end louver are performed in the strip of heat conductive material prior to said step of forming a folded fin.
17. The method according to claim 12 wherein said affixing step comprises metallurgically bonding the folded fin edge to the base plate.
18. The method according to claim 12 wherein said affixing step comprises adhesively bonding the folded fin edge to the base plate.
19. The method according to claim 12 wherein said louver forming step forms the louvers substantially at right angles to the curved portions.
20. The method according to claim 12 wherein said louver forming step forms the louvers substantially at an angle other than a right angle or parallel with respect to the curved portions.
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US10/078,942 US6615910B1 (en) | 2002-02-20 | 2002-02-20 | Advanced air cooled heat sink |
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