WO2006041325A1 - Multi-filament heat sink - Google Patents

Multi-filament heat sink Download PDF

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Publication number
WO2006041325A1
WO2006041325A1 PCT/RU2004/000393 RU2004000393W WO2006041325A1 WO 2006041325 A1 WO2006041325 A1 WO 2006041325A1 RU 2004000393 W RU2004000393 W RU 2004000393W WO 2006041325 A1 WO2006041325 A1 WO 2006041325A1
Authority
WO
WIPO (PCT)
Prior art keywords
filaments
thermoconductive
electronic component
heat dissipating
heat sink
Prior art date
Application number
PCT/RU2004/000393
Other languages
French (fr)
Inventor
Vadim Anatolievich Pomytkin
Igor Anatolievich Pomytkin
Original Assignee
Verteletsky, Pavel Vasilievich
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Verteletsky, Pavel Vasilievich filed Critical Verteletsky, Pavel Vasilievich
Priority to PCT/RU2004/000393 priority Critical patent/WO2006041325A1/en
Publication of WO2006041325A1 publication Critical patent/WO2006041325A1/en

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Classifications

    • 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
    • H01L23/3677—Wire-like or pin-like cooling fins or heat sinks
    • 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
    • H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
    • H01L23/467—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing gases, e.g. air
    • 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 relates to heat sink for dissipating heat from an electronic component of electronic systems.
  • thermoconductive filament-type heat sink composed by multiple of thermoconductive filaments
  • thermal resistance of multi-filament type heat sink through minimizing the diameter of thermoconductive filaments. It is an object of the present invention to provide a filament-type heat sink thermally coupled to an electronic component such as a microprocessor to prevent the electronic component from overheating.
  • FIG.l is a perspective view of heat sink according to some embodiments.
  • FIG.2 shows the heat sink of FIG.l in a cross section through the line V — V in FIG.l.
  • FIG.3A and 3B are perspective views of a connection of the plurality of heat dissipating thermoconductive filaments to the base of the heat sink of FIGS.1 and 2.
  • FIG.4 is a graph of thermal resistance versus filament diameters for the heat sink of FIG.l.
  • FIG.5 is a schematic side view of an electronic system according to some embodiments.
  • FIG.l is a perspective view of heat sink 10 according to some embodiments.
  • FIG.2 is the heat sink of FIG.l in a cross section through the line V — V in FIG.l.
  • the heat sink 10 includes a plurality of heat dissipating thermoconductive filaments 1, having the maximal thickness in cross-section from 0.1 to 650 microns, preferably from 0.1 to 390 microns; a base 2 to which the plurality of heat dissipating thermoconductive filaments is connected; and ventilation means 3 for supplying the heat dissipating thermoconductive filaments with ambient air.
  • the plurality of heat dissipating thermoconductive filaments 1 contacts to the electronic component 4 at one face end and contacts to ambient air at the opposed end.
  • FIG. 3A and 3B is a perspective view of a connection of the plurality of heat dissipating thermoconductive filaments 1 to the base 2 of the heat sink 10 of FIGS. 1 and 2.
  • thermoconductive filaments 1 The plurality of heat dissipating thermoconductive filaments 1 is retained by the base 2 consisting of two separate parts 2a and 2b connected together with screws 9, wherein the U-shaped connection part 2a and the T-shaped connection part 2b presses the thermoconductive filaments 1 together to provide needed connection between the plurality of the filam nts 1 and the base 2.
  • FIG.4 is a graph of the thermal resistance versus filament diameters of heat sink 10 of FIGS.1 through 3.
  • the thermal resistance was measured for the heat sinks 10 having filament diameters ranging from 230 to 650 microns; and number of filaments 1883 (for the heat sink 10 with filaments with diameter 230 microns), 6496 (350 microns), 15000 (230 microns), and 47087 (130 microns) respectively; and under otherwise equal conditions.
  • the length of the heat dissipating copper filaments was equal to 80 mm. Mass of each of said plurality of heat dissipating copper filaments was equal to 445 g, and each of said plurality of copper filaments had contact area with electronic component (50W power) of about 1 square inch.
  • FIG.4 demonstrates decreasing the thermal resistance of multi-filament heat sink 10 with decreasing the filament diameter.
  • the thermal resistance of multi-filament heat sink 10 may be minimized by decreasing the filament diameter and increasing filament number under constant mass of the plurality of heat dissipating thermoconductive filaments 1 and the constant area of contact between said plurality of heat dissipating thermoconductive filaments 1 and electronic component 4.
  • all the heat dissipating thermoconductive filaments 1 have substantially the same length as each other. In some embodiments, the length of the heat dissipating thermoconductive filaments
  • 1 may be substantially from 1 to 500 mm.
  • the number of the heat dissipating thermoconductive filaments 1 may be from 1800 to 1000000 depending on the filament diameter and the area of the electronic component in need in heat dissipating.
  • the number of the heat dissipating thermoconductive filaments 1 may be 47000, if the filament diameter is 130 micron and the area of the electronic component in need in heat dissipating is about 1 square inch.
  • the heat dissipating thermoconductive filaments 1 may have an arbitrary shape in the filament cross-section.
  • the filament may have a circle shape in the filament cross-section.
  • the heat dissipating thermoconductive filament 1 may contact to the electronic component at the filament end face. In another embodiments, the heat dissipating thermoconductive filament 1 may contact to the electronic component at the filament side, preferably but not exclusively near the filament end. In some embodiments, the plurality of heat dissipating thermoconductive filaments
  • 1 may be straightened or curved to meet requirements of packaging, especially acute in high density packaging electronic systems.
  • the heat dissipating thermoconductive filaments 1 may be manufactured from non-metal and metal materials by methods well-known from the art.
  • Non-exclusive examples of materials include copper and alloys thereof, aluminum and alloys thereof, thermoconductive polymers, carbon, diamond, and etc.
  • FIG.5 is a schematic side view of an electronic system 12 according to some embodiments, which incorporates the heat sink 10 of FIGS. 1 and 2.
  • the electronic system 12 includes a substrate 11, an electronic component 4 mounted on the substrate 11, and a heat sink 10 of FIGS. 1 through 3 thermally coupled to the electronic component 4.
  • the electronic system 12 may be a personal computer.
  • the electronic system 12 includes an electronic component 4, which is mounted on substrate 11, and which may be a conventional packaged IC.
  • the electronic component 4 may be a processor such as any type of computational circuit, including but not limited to a microprocessor, a microcontroller, a complex instruction set computing (CISC) microprocessor, a reduced instruction set computing (RISC) microprocessor, a very long instruction word (VLIW) microprocessor, a graphics processor, a digital signal processor (DSP), or any other type of processor or processing circuit.
  • the electronic system 12 may also include a number of other components which are not shown in the drawing.
  • These components are include, but are not limited to, a chip set and/or a communication circuit which may be functionally coupled to the electronic component 4 and which may be mounted on the substrate 11, a digital switching circuit, a radio frequency (RF) circuit, a memory circuit, a custom circuit, an application-specific integrated circuit (ASIC), an amplifier, and any other component which may also be included in the electronic system 12 and mounted on the substrate 11 such as an external memory in the form of one or more memory elements, RAM (random access memory) and/or ROM (read only memory), one or more hard drives and/or one or more drives that handle removable media such as floppy diskettes, compact disks (CDs), digital video disks (DVDs), and so forth all of these components may be functionally coupled to the electronic component 4.
  • RF radio frequency
  • ASIC application- specific integrated circuit
  • amplifier and any other component which may also be included in the electronic system 12 and mounted on the substrate 11 such as an external memory in the form of one or more memory elements, RAM (random access memory) and/or ROM
  • Still other components may be included in the electronic system 12 such as a display device, one or more speakers, and a keyboard and/or controller, which can include a mouse, trackball, game controller, speech recognition device or any other device that permits a user to input information into and/or receive information from the electronic system 12.
  • a display device such as a liquid crystal display, a liquid crystal display, a liquid crystal display, a liquid crystal display, a liquid crystal display, a liquid crystal display, or any other display device.
  • a keyboard and/or controller which can include a mouse, trackball, game controller, speech recognition device or any other device that permits a user to input information into and/or receive information from the electronic system 12.
  • Each of these devices may be functionally coupled to the electronic component 4.
  • the electronic system 12 which incorporates the heat sink 10 need not be a personal computer, but may alternatively be a server computer or a game device, for example.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)

Abstract

This invention relates to a heat sink comprising a plurality of heat dissipating thermoconductive filaments contacting to the electronic component at one end and contacting to ambient air at the opposed end, said filament having the maximal thickness in cross-section from 0.1 to 650 microns, preferably 0.1 to 390 microns; a base to which the plurality of heat dissipating thermoconductive filaments is connected, said base having a free surface attachable to the electronic component, said plurality of heat dissipating thermoconductive filaments being attachable to the electronic component; and ventilation means for supplying the heat dissipating thermoconductive filaments with ambient air. Further, the invention relates to an electronic system comprising a substrate, an electronic component mounted on the substrate, and described above heat sink thermally coupled to the electronic component. Preferably, the electronic system is a personal computer.

Description

MULTI-FILAMENT HEAT SINK
Technical Field The present invention relates to heat sink for dissipating heat from an electronic component of electronic systems.
Background of the Invention
It is known that electronic equipment provides a heat sink that is thermally coupled to an electronic component such as a microprocessor to prevent the electronic component from overheating. It may be expected that continued development of microprocessors or other electronic components may increase the demands on heat sinks and may make more efficient heat sinks particularly desirable, especially in high density packaging electronic systems.
Various examples of heat sinks, including those used in electronic packaging, are known in the art. The following are representative examples: 1) U.S. Pat. No. 4,733,453 and 5,499,450 (Jacoby) discloses methods of making multiple-pin heat sinks; 2) U.S.
Pat. No. 5,299,090 (Brady et al.) discloses pin-fin heat sink; 3) U.S. Pat. No. 5,369,301
(Hayashi et al.) discloses pin-finned forged heat sink; 4) U.S. Pat. No. 5,673,177
(Brodsky et al.) discloses heat sink structure with corrugated wound wire heat conductive elements; 5) U.S. Pat. No. 6,747,865 (Capriz et al.) discloses heat sink for electronic components.
However, none of these heat sinks offer minimal thermal resistance, a prime factor in overall heat exchanger performance. Thus, there is the great need in heat sink minimized by thermal resistance factor for dissolving the problem of heat dissipation, especially acute in high density packaging electronic systems.
As we found, the thermal resistance of filament-type heat sink composed by multiple of thermoconductive filaments is decreased dramatically with decreasing of the filament diameter and under otherwise equal conditions. Accordingly, it is now possible to minimize the thermal resistance of multi-filament type heat sink through minimizing the diameter of thermoconductive filaments. It is an object of the present invention to provide a filament-type heat sink thermally coupled to an electronic component such as a microprocessor to prevent the electronic component from overheating.
It is an object of the present invention to provide an electronic system comprising a filament-type heat sink thermally coupled to an electronic component such as a microprocessor to prevent the electronic component from overheating.
Brief Description of the Drawings
FIG.l is a perspective view of heat sink according to some embodiments. FIG.2 shows the heat sink of FIG.l in a cross section through the line V — V in FIG.l.
FIG.3A and 3B are perspective views of a connection of the plurality of heat dissipating thermoconductive filaments to the base of the heat sink of FIGS.1 and 2.
FIG.4 is a graph of thermal resistance versus filament diameters for the heat sink of FIG.l. FIG.5 is a schematic side view of an electronic system according to some embodiments.
Detailed Description of the Invention
FIG.l is a perspective view of heat sink 10 according to some embodiments. FIG.2 is the heat sink of FIG.l in a cross section through the line V — V in FIG.l. The heat sink 10 includes a plurality of heat dissipating thermoconductive filaments 1, having the maximal thickness in cross-section from 0.1 to 650 microns, preferably from 0.1 to 390 microns; a base 2 to which the plurality of heat dissipating thermoconductive filaments is connected; and ventilation means 3 for supplying the heat dissipating thermoconductive filaments with ambient air. The plurality of heat dissipating thermoconductive filaments 1 contacts to the electronic component 4 at one face end and contacts to ambient air at the opposed end. The plurality of heat dissipating thermoconductive filaments 1 is passed through the holes of the mesh 8 to form air cavities between the filaments at said opposed end for the better heat dissipation. The base 2 has a free surface attachable to the electronic component 4. The clip 6 presses the heat sink 10 onto the electronic component 4. The ventilation means 3 is placed into to the housing 5 attached to the base 2 by screws 7. FIG. 3A and 3B is a perspective view of a connection of the plurality of heat dissipating thermoconductive filaments 1 to the base 2 of the heat sink 10 of FIGS. 1 and 2. The plurality of heat dissipating thermoconductive filaments 1 is retained by the base 2 consisting of two separate parts 2a and 2b connected together with screws 9, wherein the U-shaped connection part 2a and the T-shaped connection part 2b presses the thermoconductive filaments 1 together to provide needed connection between the plurality of the filam nts 1 and the base 2.
FIG.4 is a graph of the thermal resistance versus filament diameters of heat sink 10 of FIGS.1 through 3. The thermal resistance was measured for the heat sinks 10 having filament diameters ranging from 230 to 650 microns; and number of filaments 1883 (for the heat sink 10 with filaments with diameter 230 microns), 6496 (350 microns), 15000 (230 microns), and 47087 (130 microns) respectively; and under otherwise equal conditions. The length of the heat dissipating copper filaments was equal to 80 mm. Mass of each of said plurality of heat dissipating copper filaments was equal to 445 g, and each of said plurality of copper filaments had contact area with electronic component (50W power) of about 1 square inch. FIG.4 demonstrates decreasing the thermal resistance of multi-filament heat sink 10 with decreasing the filament diameter. Thus, the thermal resistance of multi-filament heat sink 10 may be minimized by decreasing the filament diameter and increasing filament number under constant mass of the plurality of heat dissipating thermoconductive filaments 1 and the constant area of contact between said plurality of heat dissipating thermoconductive filaments 1 and electronic component 4.
In some embodiments, all the heat dissipating thermoconductive filaments 1 have substantially the same length as each other. In some embodiments, the length of the heat dissipating thermoconductive filaments
1 may be substantially from 1 to 500 mm.
In some embodiments, the number of the heat dissipating thermoconductive filaments 1 may be from 1800 to 1000000 depending on the filament diameter and the area of the electronic component in need in heat dissipating. For example, the number of the heat dissipating thermoconductive filaments 1 may be 47000, if the filament diameter is 130 micron and the area of the electronic component in need in heat dissipating is about 1 square inch.
In some embodiments, the heat dissipating thermoconductive filaments 1 may have an arbitrary shape in the filament cross-section. For example, the filament may have a circle shape in the filament cross-section.
In some embodiments, the heat dissipating thermoconductive filament 1 may contact to the electronic component at the filament end face. In another embodiments, the heat dissipating thermoconductive filament 1 may contact to the electronic component at the filament side, preferably but not exclusively near the filament end. In some embodiments, the plurality of heat dissipating thermoconductive filaments
1 may be straightened or curved to meet requirements of packaging, especially acute in high density packaging electronic systems.
In some embodiments, the heat dissipating thermoconductive filaments 1 may be manufactured from non-metal and metal materials by methods well-known from the art. Non-exclusive examples of materials include copper and alloys thereof, aluminum and alloys thereof, thermoconductive polymers, carbon, diamond, and etc.
FIG.5 is a schematic side view of an electronic system 12 according to some embodiments, which incorporates the heat sink 10 of FIGS. 1 and 2. The electronic system 12 includes a substrate 11, an electronic component 4 mounted on the substrate 11, and a heat sink 10 of FIGS. 1 through 3 thermally coupled to the electronic component 4.
In some embodiments, the electronic system 12 may be a personal computer. In some embodiments, the electronic system 12 includes an electronic component 4, which is mounted on substrate 11, and which may be a conventional packaged IC. For example, the electronic component 4, may be a processor such as any type of computational circuit, including but not limited to a microprocessor, a microcontroller, a complex instruction set computing (CISC) microprocessor, a reduced instruction set computing (RISC) microprocessor, a very long instruction word (VLIW) microprocessor, a graphics processor, a digital signal processor (DSP), or any other type of processor or processing circuit. The electronic system 12 may also include a number of other components which are not shown in the drawing. These components are include, but are not limited to, a chip set and/or a communication circuit which may be functionally coupled to the electronic component 4 and which may be mounted on the substrate 11, a digital switching circuit, a radio frequency (RF) circuit, a memory circuit, a custom circuit, an application- specific integrated circuit (ASIC), an amplifier, and any other component which may also be included in the electronic system 12 and mounted on the substrate 11 such as an external memory in the form of one or more memory elements, RAM (random access memory) and/or ROM (read only memory), one or more hard drives and/or one or more drives that handle removable media such as floppy diskettes, compact disks (CDs), digital video disks (DVDs), and so forth all of these components may be functionally coupled to the electronic component 4.
Still other components (not shown) may be included in the electronic system 12 such as a display device, one or more speakers, and a keyboard and/or controller, which can include a mouse, trackball, game controller, speech recognition device or any other device that permits a user to input information into and/or receive information from the electronic system 12. Each of these devices, too, may be functionally coupled to the electronic component 4.
It should be understood that the electronic system 12 which incorporates the heat sink 10 need not be a personal computer, but may alternatively be a server computer or a game device, for example.
The several embodiments described herein are solely for the purpose of illustration.
The various features described herein need not all be used together, and any one or more of those features may be incorporated in a single embodiment. Therefore, persons skilled in the art will recognize from this description that other embodiments may be practiced with various modifications and alterations.

Claims

We claim:
1. A heat sink comprising: a plurality of heat dissipating thermoconductive filaments contacting to the electronic component at one end and contacting to ambient air at the opposed end, said filament having the maximal thickness in cross-section from 0.1 to 650 microns; a base to which the plurality of heat dissipating thermoconductive filaments is connected, said base having a free surface attachable to the electronic component, said plurality of heat dissipating thermoconductive filaments being attachable to the electronic component; and ventilation means for supplying the heat dissipating thermoconductive filaments with ambient air.
2. The heat sink of claim 1, wherein said filament having the maximal thickness in cross-section from 0.1 to 390 microns.
3. An electronic system comprising: a substrate; an electronic component mounted on the substrate; and a heat sink thermally coupled to the electronic component, the heat sink including: a plurality of heat dissipating thermoconductive filaments contacting to the electronic component at one end and contacting to ambient air at the opposed end, said filament having the maximal thickness in cross-section from 0.1 to 650 microns; a base to which the plurality of heat dissipating thermoconductive filaments is connected, said base having a free surface attachable to the electronic component, said plurality of heat dissipating thermoconductive filaments being attachable to the electronic component; and ventilation means for supplying the heat dissipating thermoconductive filaments with ambient air.
4. The electronic system of claim 3, wherein said filament having the maximal thickness in cross-section from 0.1 to 390 microns.
5. The electronic system of claim 3, wherein the substrate is a circuit board.
6. The electronic system of claim 3, wherein the electronic component is microprocessor.
7. The electronic system of claim 3, wherein the system is a personal computer.
PCT/RU2004/000393 2004-10-08 2004-10-08 Multi-filament heat sink WO2006041325A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/RU2004/000393 WO2006041325A1 (en) 2004-10-08 2004-10-08 Multi-filament heat sink

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/RU2004/000393 WO2006041325A1 (en) 2004-10-08 2004-10-08 Multi-filament heat sink

Publications (1)

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WO2006041325A1 true WO2006041325A1 (en) 2006-04-20

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5390734A (en) * 1993-05-28 1995-02-21 Lytron Incorporated Heat sink
WO1999051069A2 (en) * 1998-03-30 1999-10-07 University Of Maryland Fiber heat sink and fiber heat exchanger
WO2000033628A1 (en) * 1998-12-02 2000-06-08 Intel Corporation A fibrous thermal interface adaptor
US6191944B1 (en) * 1998-11-05 2001-02-20 Electrovac, Fabrikation Elektrotechnischer Spezialartikel Gesellschaft M.B.H. Heat sink for electric and/or electronic devices
WO2001067019A1 (en) * 2000-03-08 2001-09-13 Thermal Corp. Matrix heat sink with extending fibers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5390734A (en) * 1993-05-28 1995-02-21 Lytron Incorporated Heat sink
WO1999051069A2 (en) * 1998-03-30 1999-10-07 University Of Maryland Fiber heat sink and fiber heat exchanger
US6191944B1 (en) * 1998-11-05 2001-02-20 Electrovac, Fabrikation Elektrotechnischer Spezialartikel Gesellschaft M.B.H. Heat sink for electric and/or electronic devices
WO2000033628A1 (en) * 1998-12-02 2000-06-08 Intel Corporation A fibrous thermal interface adaptor
WO2001067019A1 (en) * 2000-03-08 2001-09-13 Thermal Corp. Matrix heat sink with extending fibers

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