CA2070062C - Cooling structure for integrated circuits - Google Patents
Cooling structure for integrated circuitsInfo
- Publication number
- CA2070062C CA2070062C CA002070062A CA2070062A CA2070062C CA 2070062 C CA2070062 C CA 2070062C CA 002070062 A CA002070062 A CA 002070062A CA 2070062 A CA2070062 A CA 2070062A CA 2070062 C CA2070062 C CA 2070062C
- Authority
- CA
- Canada
- Prior art keywords
- coolant
- liquid coolant
- integrated circuit
- heat radiating
- radiating surface
- 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.)
- Expired - Fee Related
Links
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
- H01L23/42—Fillings or auxiliary members in containers or encapsulations selected or arranged to facilitate heating or cooling
- H01L23/433—Auxiliary members in containers characterised by their shape, e.g. pistons
-
- 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
- H01L23/473—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing liquids
- H01L23/4735—Jet impingement
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73251—Location after the connecting process on different surfaces
- H01L2224/73253—Bump and layer connectors
-
- 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
- H01L2924/01—Chemical elements
- H01L2924/01014—Silicon [Si]
-
- 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
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/151—Die mounting substrate
- H01L2924/153—Connection portion
- H01L2924/1531—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface
- H01L2924/15312—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface being a pin array, e.g. PGA
Abstract
A cooling structure for an integrated circuit includes a wiring substrate and an integrated circuit mounted on the wiring substrate. Storage means for storing a liquid coolant, have an inlet and an outlet for the liquid coolant at the top thereof and an opening at the bottom thereof and adhering means for fastening together the bottom of the storing means and a heat radiating face of the integrated circuit. Spraying means, directly spray the liquid coolant on the heat radiating face of the integrated circuit through the opening.
Description
2~ 7~62 The present invention relates to a cooling structure for integrated circuits (IC's3,J.and more particularly to a cooling structure which coals IC's by circulating a liquid coolant, such as water, in the vicinity of the IC's and transferring the heat generated in the IC's to the liquid coolant.
Examples of this kind of prior art cooling structure are disclosed in the article entitled "A
Conduction-Cooled Module for High-Performance LSI Devices"
by S. Oktay and H.C. ~ammerer, published in IBM J. RES.
DEVELOP, Vol. 26, No. 1, Jan. 1982 and Japanese Patent Application Disclosure No. Sho 60-160150.
The former discloses a structure whereby the heat generated in an IC on a wiring board is conducted to a cold plate via a piston having a spherical contact face, a gap filled with helium gas, a hat and an interposer, by pressing the piston against a heat-radiating face of the IC
by use of a spring, and cooling the cold plate with a cooling medium.
The latter teaches a structure which comprises a heat transfer substrate, a variable-shape heat conductor and a heat transfer plate arranged over heat radiating faces of chips on a printed wiring board together with a varia~le-elasticity bellows, and achieves cooling by spraying a liquid coolant from a nozzle over the heat transfer plate within the bellows.
These prior art cocling structures, however, have the following disadvantages:
First, regarding the cooling structure referred to in the article by Oktay et al, the continuous pressure of the piston against the heat radiating face of the IC produces a load on the connecting part between the IC and the wiring board and thereby reduces the reliability of the connecting part.
Second, this csoling structure, in which .he face of the piston contactinc the IC is spherlcally shaped and a gap is provided between the hat and the piston to 20700h2 absorb fluctuations in height and inclination which occur when the IC is fitted to a wiring board, has a reduced cooling efficiency due to the limitation this configuration imposes on the effective heat transfer area.
. ` Third, in the same cooling structure, the path of the coolant flow in the cold plate is for~ed for heat transfer by forced convection, resulting in a heat transfer coefficient of no more than 0.1 to 0.5 W/cm ~C, and accordingly the cooling capacity could prove insufficient if the power consumption rises with an increase in the degree of circuit integration.
The cooling structure disclosed in Japanese Patent Application Sho 60-160150 is unable to provide a high enough heat conductivity, resulting in an insufficient cooling capacity, because of its configuration having the heat transfer substrate, variable-shape heat conductor and heat transfer plate intervening between the liquid coolant sprayed from the nozzle and the chips which are the sources of heat.
An object of the invention, therefore, is to provide a cooling structure for IC's free from the above-mentioned disadvantages of the prior art structures.
According to an aspect of the invention, there is provided a cooling structure for an integrated circuit mounted on a wiring substrate said integrated circuit displaying a heat radiating surface, said structure comprising: storage means for storing a liquid coolant, having an inlet and an outlet at the top thereof and an opening at the bottom thereof; adhering means for fastening the bottom of said storage means to the heat radiating surface of said integrated circuit; and spraying means for directly spraying said liquid coolant through said opening onto said heat radiating surface of said integrated circuit.
Another aspect of the invention provides a cooling structure for an integrated circuit mounted on a '~
wiring s~bstrate,said integrated circuit displaying a heat radiating surface, said structure comprising: storage means for storing a liquid coolant, including a first hollow member with an open top and a bottom opening and a second member arranged on the top of said hollow member, said second member having an inlet and an outlet for said liquid coolant; adhering means for fastening the bottom of said first member to said heat radiating surface of said integrated circuit; and spraying means for directly spraying said liquid coolant on said heat radiating surface of said integrated circuit.
The features and advantages of the present invention will become apparent from the following description when taken in conjunction with the accompanying lS drawings, in which:
Figure 1 shows a vertical cross-sectional view of a first embodiment of the invention;
Figure 2 shows a vertical cross-sectional view of a second embodiment of the invention;
Figure 3 shows a vertical cross-sectional view of a third embodiment of the invention;
Figure 4 shows a vertical cross-sectional view of a prior art cooling structure for IC's; and Figure 5 shows a vertical cross-sectional 2S view of another prior art cooling structure for IC's.
In the drawings, li~e reference numerals represent like structural elements.
~ escription will first be made of prior art cooling structures for IC's with a view to better understanding of the invention.
Referring to Figure 4, a conventional cooling structure for IC's consists of a wiring board 20, an IC 21, a piston 22, the part of which comes into contact with the IC being spherical, a spring 23, a hat 24, an interposer 25, a cold plate 26, a coolant 27 and helium gas 28.
4 2070062 ~
The piston 22 is pressed against a heat radiating face of the IC 21 by the elastic force of the spring 23. In this arrangement, the heat generated in the IC 21 is transmitted to the piston 22 which is in contact with the heat radiating face of the IC 21, and also to the hat 24 and the interposer 2S via a space filled with helium gas 28. Further, this heat is transmitted from the interposer 2S to the plate 26, and discharged into the coolant 27.
Referring now to Flgure 5, another conventional cooling structure for IC's consists of a printed wiring board 30, a chip 31, a heat transfer substrate 32, a variable-shape heat conductor 33, a heat transfer plate 34, a nozzle 35, a bellows 36 and a cooling header 37.
The heat generated in the chip 31 on the board 30 is transmitted via the substrate 32, the conductor 33 and the plate 34. In this arrangement, the plate 34 is cooled by spraying a liquid coolant through the nozzle 35 in the bellows 36, and the liquid coolant is discharged from the bellows 36 to a flow path in the header 37.
Next, a detailed description will be provided of preferred embodiments of the invention.
Referring to Figure 1, a first embodiment o~
the invention comprises a wiring substrate 1, an IC 2, a seal 3, a nozzle 5, a cooling block 4 provided with a coolant outlet 6 and a coolant inlet 7, and a liquid coolant 8.
The cylindrical cooling bloc~ 4, having an opening in its bottom, is fastened with the seal 3 to the IC 2 mounted on the substrate 1. The IC 2 here may be in the form of a chip carrier comprising a large-scale IC
(LSI) housed in a case or a flip chip in which an LSI is bare mounted without a case. The seal 3 may be an epoxy-or silicon-based adhesive.
~ n 2070~62 .
The bloc~ 4 is provided with the inlet 7 for permitting the inflow of coolant 8, the nozzle 5 for spraying coolant 8 which has flowed in through the inlet 7, and the outlet 6 for discharging coolant 8 which has accumulated within the bloc~ interior. Therefore, since the coolant 8 having flowed in through the inlet 7 is directly sprayed by the nozzle 5 near the center of the heat radiating face of the IC 2, the IC 2 is directly cooled by the--coolant 8 without the intermediary of any heat transfer plate or anything else.
Since in this arrangement the IC 2 and the block 4 are tightly sealed by the seal 3, there is no possibility for the coolant 8 to leaX over the substrate 1.
Therefore, there is no particular need for the coolant 8 to be an electrical insulator, and it may be an electrically non-insulative liquid coolant, such as water. More specifically, the coolant 8 can be selected solely for its cooling capability irrespective of its insulative a~ility.
Accordlng to the first embodiment described above, since the IC 2 mounted on the wiring substrate 1,-is fastened with the seal 3 to the bottom portion of the bloc~
4 and the coolant 8 is directly sprayed by the nozzle 5 provided in the bloc~ 4 over the IC 2, the thermal resistance from the PN junction of the IC 2 to the coolant 8 can be significantly reduced.
Referring now to Figure 2, a second embodiment of the invention comprises a wiring substrate 1;
an IC 2; a seal 3; a cooling block 9 which include a hollow cylinder 9a and a lid 9b having a coolant outlet 6 and a coolant inlet 7 through which a liquid coolant 8 is supplied. A nozzle S extends through the lid 9b of the bloc~ 9.
In the embodiment, the lid 9b is provided with the inlet 7, the nozzle 5 and the outlet 6, and the lid 9b is fixed to the top face of the cylinder 9a either by brazing or with an adhesive. Therefore, since the ,, ~
coolant 8 is directly sprayed by the nozzle 5 near the center of a heat radiating face of the IC 2, the IC 2 is directly cooled by the coolant 8 without the intermediary of a heat transfer plate or anything else.
Thus, according to the second e~bodiment, since the IC 2 mounted on the wiring substrate 1 is fastened with the seal 3 to the bottom portion of the block 9 and the coolant 8 is directly sprayed by the nozzle 5 provided in the bloc~ 9 over the IC 2, the thermal resistance from the PN junction of the IC 2 to the coolant 8 can be significantly reduced.
Referring next to Figure 3, a third embodiment of the invention comprises a wiring substrate l;
IC's 2-1 through 2-5; a seal 3; a liquid coolant 8; a substrate frame 10; storage sections 12-1 through 12-5 for storing the coolant 8, each having an opening in its bottom; nozzles 13-1 through 13-5; a cooling bloc~ 11 having coolant outlets 6-1 through 6-5 and coolant inlets 7-1 through 7-5; a coolant entrance lS; a coolant inflow path 16; a coolant discharge path 17; a coolant exit 18;
and a header 14 having facing grooves 19-1 through 19-4 for connecting in series the outlets 6-1 to 6-4 with the inlets 7-2 to 7-5 arranged in the block 11.
The IC's 2-1 through 2-5 are arranged and mounted on the substrate 1 in a matrix form. The frame 10 is fixed so as to surround the periphery of the substrate 1.
The block 11 is provided with the sections 12-1 through 12-5 in which is stored the coolant 8 in positions respectively corresponding to the IC's 2-1 through 2-5 mounted on the substrate 1. In the bloc~ 11, the openings of the sections 12-1 through 12-5 are positioned above the top faces of the IC's 2-1 through 2-5, and the sections 12-1 through 12-5 are fitted into the frame 10. The bottom portions of the block defining the openings of the sections 12-1 through 12-5 are fastened to 2070~6~
the top faces of the IC's 2-1 through 2-5, respectively, and the sections 12-1 to 12-5 are sealed with the seal 3.
Further, the sections 12-1 through 12-5 of the bloc}c 11 are provided with the coolant inlets 7-1 through 7-5 and the coolant outlets 6-1 through 6-5, and the inlets 7-1 through 7-5 are contiguous with the nozzles 13-1 through 13-5, respectively, for spraying the coolant 8 near the centers of the heat radiating faces of the IC's 2-1 through 2-5.
The header 14, fitted to the upper side of the bloc}~ 11, has the entrance 15, the inflow path 16, the discharge path 17 and the exit 18. Thus, the liquid coolant flowing in through the entrance 15 is distributed among a plurality of flow channel lines by the inflow path 16 arranged near the entrance 15, and the coolant 8 discharged from the plurality of flow channel lines, after being collected into the path 17 arranged near the exit 18, is discharged throl~gh the exit 18.
The header 14 is provided with the groove 19-1 for connecting the outlet 6-1 of the section 12-1 and the inlet 7-2 of the section 12-2, the groove 1~-2 for connecting the outlet 6-2 of the section 12-2 and the inlet 7-3 of the section 12-3, the groove }9-3 for connecting the outlet 6-3 of the section 12-3 and the inlet 7-4 of the section 12-4, and the groove 19-4 for connecting the outlet 6-4 of the section 12-4 and the inlet 7-5 of the section 12--5.
The coolant 8 flowing in through the entrance 15 of the header 14 fills the path 16, is then sprayed by the nozzle 13-1 toward the vicinity o~ the center of the heat radiating face of the IC 2-1, and collides against the heat radiating face. The collided coolant 8, after filling the section 12-1, passes through the outlet 6-1 and the groove 19-1, is sprayed by the nozzle 13-2 toward the vicinity of the center of the heat radiating face of the IC 2-2, and collides against that face.
The liquid coolant 8 having collided against the top face of the integrated circuit 2-2, similarly to the above, passes through the outlets 6-2, 6-3 and 6-4 and the grooves 19-2, 19-3 and 19-4, respectively is sprayed by the nozzles 13-3, 13-4 and 13-5 toward the vicinity of the centers of the heat radiating faces of the IC's 2-3, 2-4 and 2-5, and collides against the respective faces.
The coolant 8 having collided against the top face of the IC 2-5, after filling the section 12-5 and being collected in the path 17 through the outlet 6-5, is discharged outside through the exit 18.
Therefore, heat generated in the IC's 2-1 through 2-5 is cooled by being transmitted to the coolant 8 which has been sprayed by the nozzles 13-1 through 13-5 over the top faces of the IC's 2-1 through 2-5 and colliding against the respective faces.
As described above, according to the third embodiment, it is possible to provide a cooling s~ructure with little thermal resistance by fastening the frame 10 to the substrate 1 on which the plurality of the IC's 2-1 through 2-5 are mounted, fastening the top faces of the IC's 2-1 through 2-5 to the bloc~ 11 with the sealing 3, fitting the bloc~ 11 to the frame 10, and fitting header 14 on the bloc~ 11. The flow channels are so formed as to allow the nozzles 13-1 through 13-5 fitted to the block 11 to directly spray the coolant 8 toward the vicinity of the centers of the heat radiating faces of the IC's 2-1 through 2-5, respectively.
In an experiment in which water was used as the coolant 8 and the speed of its spraying from the nozzles 5 (Figures 1 and 2) and 13-1 through 13-5 (Figure 3) was varied between 0.5 and 3.0 m/s, a heat conductivity of 1 to 3 w/cm C was obtained. Furthermore, the openings of the blocXs 4, 9 and 11 are fastened to the IC's 2 and 2-1 through 2-5 with the sealing 3 and the coolant 8 is brought into direct collision against the IC's 2 and 2-1 through 2-5, which are the sources of heat. Therefore, the presence of air, which has a poor heat conductivity, or of any heat-conductive compound or metal in the heat transmission path is eluded, obt~in;ng a thermal resistance of 0.5 to llC/w or even less between the PN junctions of the IC's 2 and 2-1 through 2-5 and the coolant 8.
Since the bottom portions of the cooling bloc~s 4, 9 and 11 are fastened to the IC's 2 and 2-1 through 2-5, respectively, and sealed with the sealing 3, there is no possibility for the coolant 8 to leak out of the flow channel over the substrate 1 or anywhere else.
Therefore, an electrically non-insulative liquid coolant can be used, such as water.
Although the bloc~s 4 and 9 have been described above as hollow cylinders, they may also be hollow rectangular parallelepipeds. Further, though the header 14 provided with the path 16, the path 17 and the grooves 19-1 through 19-4 is fitted on the cooling block 11 and the coolant channel is formed so as to mutually connect the sections 12-1 through 12-5 of the cooling block 11, independent coolant channels may also be formed to let the coolant 8 circulate separately in the sections 12-1 through 12-~.
The above-mentioned description has made it clear that, since the opened bottoms of the storage sections for storing the liquid coolant are sealed to the heat radiating faces of the IC's and the nozzles provided in the cooling block directly spray the liquid coolant toward the centers of the heat radiatin~ Laces of the IC's, the thermal resistance from the IC's to the liquid coolant can be significantly reduced.
While the present invention has been described in conjunction with the preferred embodiments 207~62 thereof, it will now be readi~y possible for those skilled in the art to put this invention into practice in various other manners.
~.
Examples of this kind of prior art cooling structure are disclosed in the article entitled "A
Conduction-Cooled Module for High-Performance LSI Devices"
by S. Oktay and H.C. ~ammerer, published in IBM J. RES.
DEVELOP, Vol. 26, No. 1, Jan. 1982 and Japanese Patent Application Disclosure No. Sho 60-160150.
The former discloses a structure whereby the heat generated in an IC on a wiring board is conducted to a cold plate via a piston having a spherical contact face, a gap filled with helium gas, a hat and an interposer, by pressing the piston against a heat-radiating face of the IC
by use of a spring, and cooling the cold plate with a cooling medium.
The latter teaches a structure which comprises a heat transfer substrate, a variable-shape heat conductor and a heat transfer plate arranged over heat radiating faces of chips on a printed wiring board together with a varia~le-elasticity bellows, and achieves cooling by spraying a liquid coolant from a nozzle over the heat transfer plate within the bellows.
These prior art cocling structures, however, have the following disadvantages:
First, regarding the cooling structure referred to in the article by Oktay et al, the continuous pressure of the piston against the heat radiating face of the IC produces a load on the connecting part between the IC and the wiring board and thereby reduces the reliability of the connecting part.
Second, this csoling structure, in which .he face of the piston contactinc the IC is spherlcally shaped and a gap is provided between the hat and the piston to 20700h2 absorb fluctuations in height and inclination which occur when the IC is fitted to a wiring board, has a reduced cooling efficiency due to the limitation this configuration imposes on the effective heat transfer area.
. ` Third, in the same cooling structure, the path of the coolant flow in the cold plate is for~ed for heat transfer by forced convection, resulting in a heat transfer coefficient of no more than 0.1 to 0.5 W/cm ~C, and accordingly the cooling capacity could prove insufficient if the power consumption rises with an increase in the degree of circuit integration.
The cooling structure disclosed in Japanese Patent Application Sho 60-160150 is unable to provide a high enough heat conductivity, resulting in an insufficient cooling capacity, because of its configuration having the heat transfer substrate, variable-shape heat conductor and heat transfer plate intervening between the liquid coolant sprayed from the nozzle and the chips which are the sources of heat.
An object of the invention, therefore, is to provide a cooling structure for IC's free from the above-mentioned disadvantages of the prior art structures.
According to an aspect of the invention, there is provided a cooling structure for an integrated circuit mounted on a wiring substrate said integrated circuit displaying a heat radiating surface, said structure comprising: storage means for storing a liquid coolant, having an inlet and an outlet at the top thereof and an opening at the bottom thereof; adhering means for fastening the bottom of said storage means to the heat radiating surface of said integrated circuit; and spraying means for directly spraying said liquid coolant through said opening onto said heat radiating surface of said integrated circuit.
Another aspect of the invention provides a cooling structure for an integrated circuit mounted on a '~
wiring s~bstrate,said integrated circuit displaying a heat radiating surface, said structure comprising: storage means for storing a liquid coolant, including a first hollow member with an open top and a bottom opening and a second member arranged on the top of said hollow member, said second member having an inlet and an outlet for said liquid coolant; adhering means for fastening the bottom of said first member to said heat radiating surface of said integrated circuit; and spraying means for directly spraying said liquid coolant on said heat radiating surface of said integrated circuit.
The features and advantages of the present invention will become apparent from the following description when taken in conjunction with the accompanying lS drawings, in which:
Figure 1 shows a vertical cross-sectional view of a first embodiment of the invention;
Figure 2 shows a vertical cross-sectional view of a second embodiment of the invention;
Figure 3 shows a vertical cross-sectional view of a third embodiment of the invention;
Figure 4 shows a vertical cross-sectional view of a prior art cooling structure for IC's; and Figure 5 shows a vertical cross-sectional 2S view of another prior art cooling structure for IC's.
In the drawings, li~e reference numerals represent like structural elements.
~ escription will first be made of prior art cooling structures for IC's with a view to better understanding of the invention.
Referring to Figure 4, a conventional cooling structure for IC's consists of a wiring board 20, an IC 21, a piston 22, the part of which comes into contact with the IC being spherical, a spring 23, a hat 24, an interposer 25, a cold plate 26, a coolant 27 and helium gas 28.
4 2070062 ~
The piston 22 is pressed against a heat radiating face of the IC 21 by the elastic force of the spring 23. In this arrangement, the heat generated in the IC 21 is transmitted to the piston 22 which is in contact with the heat radiating face of the IC 21, and also to the hat 24 and the interposer 2S via a space filled with helium gas 28. Further, this heat is transmitted from the interposer 2S to the plate 26, and discharged into the coolant 27.
Referring now to Flgure 5, another conventional cooling structure for IC's consists of a printed wiring board 30, a chip 31, a heat transfer substrate 32, a variable-shape heat conductor 33, a heat transfer plate 34, a nozzle 35, a bellows 36 and a cooling header 37.
The heat generated in the chip 31 on the board 30 is transmitted via the substrate 32, the conductor 33 and the plate 34. In this arrangement, the plate 34 is cooled by spraying a liquid coolant through the nozzle 35 in the bellows 36, and the liquid coolant is discharged from the bellows 36 to a flow path in the header 37.
Next, a detailed description will be provided of preferred embodiments of the invention.
Referring to Figure 1, a first embodiment o~
the invention comprises a wiring substrate 1, an IC 2, a seal 3, a nozzle 5, a cooling block 4 provided with a coolant outlet 6 and a coolant inlet 7, and a liquid coolant 8.
The cylindrical cooling bloc~ 4, having an opening in its bottom, is fastened with the seal 3 to the IC 2 mounted on the substrate 1. The IC 2 here may be in the form of a chip carrier comprising a large-scale IC
(LSI) housed in a case or a flip chip in which an LSI is bare mounted without a case. The seal 3 may be an epoxy-or silicon-based adhesive.
~ n 2070~62 .
The bloc~ 4 is provided with the inlet 7 for permitting the inflow of coolant 8, the nozzle 5 for spraying coolant 8 which has flowed in through the inlet 7, and the outlet 6 for discharging coolant 8 which has accumulated within the bloc~ interior. Therefore, since the coolant 8 having flowed in through the inlet 7 is directly sprayed by the nozzle 5 near the center of the heat radiating face of the IC 2, the IC 2 is directly cooled by the--coolant 8 without the intermediary of any heat transfer plate or anything else.
Since in this arrangement the IC 2 and the block 4 are tightly sealed by the seal 3, there is no possibility for the coolant 8 to leaX over the substrate 1.
Therefore, there is no particular need for the coolant 8 to be an electrical insulator, and it may be an electrically non-insulative liquid coolant, such as water. More specifically, the coolant 8 can be selected solely for its cooling capability irrespective of its insulative a~ility.
Accordlng to the first embodiment described above, since the IC 2 mounted on the wiring substrate 1,-is fastened with the seal 3 to the bottom portion of the bloc~
4 and the coolant 8 is directly sprayed by the nozzle 5 provided in the bloc~ 4 over the IC 2, the thermal resistance from the PN junction of the IC 2 to the coolant 8 can be significantly reduced.
Referring now to Figure 2, a second embodiment of the invention comprises a wiring substrate 1;
an IC 2; a seal 3; a cooling block 9 which include a hollow cylinder 9a and a lid 9b having a coolant outlet 6 and a coolant inlet 7 through which a liquid coolant 8 is supplied. A nozzle S extends through the lid 9b of the bloc~ 9.
In the embodiment, the lid 9b is provided with the inlet 7, the nozzle 5 and the outlet 6, and the lid 9b is fixed to the top face of the cylinder 9a either by brazing or with an adhesive. Therefore, since the ,, ~
coolant 8 is directly sprayed by the nozzle 5 near the center of a heat radiating face of the IC 2, the IC 2 is directly cooled by the coolant 8 without the intermediary of a heat transfer plate or anything else.
Thus, according to the second e~bodiment, since the IC 2 mounted on the wiring substrate 1 is fastened with the seal 3 to the bottom portion of the block 9 and the coolant 8 is directly sprayed by the nozzle 5 provided in the bloc~ 9 over the IC 2, the thermal resistance from the PN junction of the IC 2 to the coolant 8 can be significantly reduced.
Referring next to Figure 3, a third embodiment of the invention comprises a wiring substrate l;
IC's 2-1 through 2-5; a seal 3; a liquid coolant 8; a substrate frame 10; storage sections 12-1 through 12-5 for storing the coolant 8, each having an opening in its bottom; nozzles 13-1 through 13-5; a cooling bloc~ 11 having coolant outlets 6-1 through 6-5 and coolant inlets 7-1 through 7-5; a coolant entrance lS; a coolant inflow path 16; a coolant discharge path 17; a coolant exit 18;
and a header 14 having facing grooves 19-1 through 19-4 for connecting in series the outlets 6-1 to 6-4 with the inlets 7-2 to 7-5 arranged in the block 11.
The IC's 2-1 through 2-5 are arranged and mounted on the substrate 1 in a matrix form. The frame 10 is fixed so as to surround the periphery of the substrate 1.
The block 11 is provided with the sections 12-1 through 12-5 in which is stored the coolant 8 in positions respectively corresponding to the IC's 2-1 through 2-5 mounted on the substrate 1. In the bloc~ 11, the openings of the sections 12-1 through 12-5 are positioned above the top faces of the IC's 2-1 through 2-5, and the sections 12-1 through 12-5 are fitted into the frame 10. The bottom portions of the block defining the openings of the sections 12-1 through 12-5 are fastened to 2070~6~
the top faces of the IC's 2-1 through 2-5, respectively, and the sections 12-1 to 12-5 are sealed with the seal 3.
Further, the sections 12-1 through 12-5 of the bloc}c 11 are provided with the coolant inlets 7-1 through 7-5 and the coolant outlets 6-1 through 6-5, and the inlets 7-1 through 7-5 are contiguous with the nozzles 13-1 through 13-5, respectively, for spraying the coolant 8 near the centers of the heat radiating faces of the IC's 2-1 through 2-5.
The header 14, fitted to the upper side of the bloc}~ 11, has the entrance 15, the inflow path 16, the discharge path 17 and the exit 18. Thus, the liquid coolant flowing in through the entrance 15 is distributed among a plurality of flow channel lines by the inflow path 16 arranged near the entrance 15, and the coolant 8 discharged from the plurality of flow channel lines, after being collected into the path 17 arranged near the exit 18, is discharged throl~gh the exit 18.
The header 14 is provided with the groove 19-1 for connecting the outlet 6-1 of the section 12-1 and the inlet 7-2 of the section 12-2, the groove 1~-2 for connecting the outlet 6-2 of the section 12-2 and the inlet 7-3 of the section 12-3, the groove }9-3 for connecting the outlet 6-3 of the section 12-3 and the inlet 7-4 of the section 12-4, and the groove 19-4 for connecting the outlet 6-4 of the section 12-4 and the inlet 7-5 of the section 12--5.
The coolant 8 flowing in through the entrance 15 of the header 14 fills the path 16, is then sprayed by the nozzle 13-1 toward the vicinity o~ the center of the heat radiating face of the IC 2-1, and collides against the heat radiating face. The collided coolant 8, after filling the section 12-1, passes through the outlet 6-1 and the groove 19-1, is sprayed by the nozzle 13-2 toward the vicinity of the center of the heat radiating face of the IC 2-2, and collides against that face.
The liquid coolant 8 having collided against the top face of the integrated circuit 2-2, similarly to the above, passes through the outlets 6-2, 6-3 and 6-4 and the grooves 19-2, 19-3 and 19-4, respectively is sprayed by the nozzles 13-3, 13-4 and 13-5 toward the vicinity of the centers of the heat radiating faces of the IC's 2-3, 2-4 and 2-5, and collides against the respective faces.
The coolant 8 having collided against the top face of the IC 2-5, after filling the section 12-5 and being collected in the path 17 through the outlet 6-5, is discharged outside through the exit 18.
Therefore, heat generated in the IC's 2-1 through 2-5 is cooled by being transmitted to the coolant 8 which has been sprayed by the nozzles 13-1 through 13-5 over the top faces of the IC's 2-1 through 2-5 and colliding against the respective faces.
As described above, according to the third embodiment, it is possible to provide a cooling s~ructure with little thermal resistance by fastening the frame 10 to the substrate 1 on which the plurality of the IC's 2-1 through 2-5 are mounted, fastening the top faces of the IC's 2-1 through 2-5 to the bloc~ 11 with the sealing 3, fitting the bloc~ 11 to the frame 10, and fitting header 14 on the bloc~ 11. The flow channels are so formed as to allow the nozzles 13-1 through 13-5 fitted to the block 11 to directly spray the coolant 8 toward the vicinity of the centers of the heat radiating faces of the IC's 2-1 through 2-5, respectively.
In an experiment in which water was used as the coolant 8 and the speed of its spraying from the nozzles 5 (Figures 1 and 2) and 13-1 through 13-5 (Figure 3) was varied between 0.5 and 3.0 m/s, a heat conductivity of 1 to 3 w/cm C was obtained. Furthermore, the openings of the blocXs 4, 9 and 11 are fastened to the IC's 2 and 2-1 through 2-5 with the sealing 3 and the coolant 8 is brought into direct collision against the IC's 2 and 2-1 through 2-5, which are the sources of heat. Therefore, the presence of air, which has a poor heat conductivity, or of any heat-conductive compound or metal in the heat transmission path is eluded, obt~in;ng a thermal resistance of 0.5 to llC/w or even less between the PN junctions of the IC's 2 and 2-1 through 2-5 and the coolant 8.
Since the bottom portions of the cooling bloc~s 4, 9 and 11 are fastened to the IC's 2 and 2-1 through 2-5, respectively, and sealed with the sealing 3, there is no possibility for the coolant 8 to leak out of the flow channel over the substrate 1 or anywhere else.
Therefore, an electrically non-insulative liquid coolant can be used, such as water.
Although the bloc~s 4 and 9 have been described above as hollow cylinders, they may also be hollow rectangular parallelepipeds. Further, though the header 14 provided with the path 16, the path 17 and the grooves 19-1 through 19-4 is fitted on the cooling block 11 and the coolant channel is formed so as to mutually connect the sections 12-1 through 12-5 of the cooling block 11, independent coolant channels may also be formed to let the coolant 8 circulate separately in the sections 12-1 through 12-~.
The above-mentioned description has made it clear that, since the opened bottoms of the storage sections for storing the liquid coolant are sealed to the heat radiating faces of the IC's and the nozzles provided in the cooling block directly spray the liquid coolant toward the centers of the heat radiatin~ Laces of the IC's, the thermal resistance from the IC's to the liquid coolant can be significantly reduced.
While the present invention has been described in conjunction with the preferred embodiments 207~62 thereof, it will now be readi~y possible for those skilled in the art to put this invention into practice in various other manners.
~.
Claims (3)
1. A cooling structure for an integrated circuit mounted on a wiring substrate, said integrated circuit displaying a heat radiating surface, said structure comprising:
storage means for storing a liquid coolant, having an inlet and an outlet at the top thereof and an opening at the bottom thereof;
adhering means for fastening the bottom of said storage means to the heat radiating surface of said integrated circuit; and spraying means for directly spraying said liquid coolant through said opening onto said heat radiating surface of said integrated circuit.
storage means for storing a liquid coolant, having an inlet and an outlet at the top thereof and an opening at the bottom thereof;
adhering means for fastening the bottom of said storage means to the heat radiating surface of said integrated circuit; and spraying means for directly spraying said liquid coolant through said opening onto said heat radiating surface of said integrated circuit.
2. A cooling structure for an integrated circuit mounted on a wiring substrate, said integrated circuit displaying a heat radiating surface, said structure comprising:
storage means for storing a liquid coolant, including a first hollow member with an open top and a bottom opening and a second member arranged on the top of said hollow member, said second member having an inlet and an outlet for said liquid coolant;
adhering means for fastening the bottom of said first member to said heat radiating surface of said integrated circuit; and spraying means for directly spraying said liquid coolant on said heat radiating surface of said integrated circuit.
storage means for storing a liquid coolant, including a first hollow member with an open top and a bottom opening and a second member arranged on the top of said hollow member, said second member having an inlet and an outlet for said liquid coolant;
adhering means for fastening the bottom of said first member to said heat radiating surface of said integrated circuit; and spraying means for directly spraying said liquid coolant on said heat radiating surface of said integrated circuit.
3. A cooling structure for a plurality of integrated circuits mounted on a wiring substrate, each integrated circuit displaying a heat radiating surface, said cooling structure comprising:
(a) a substrate frame for holding said wiring substrate;
(b) a cooling block which includes a like plurality of storage means for storing a liquid coolant, said block having:
a bottom provided with openings associated to said storage means, so that each opening corresponds to a heat radiating surface of a facing integrated circuit of said plurality of integrated circuits; and a like plurality of spraying means associated with said openings for spraying said liquid coolant on heat radiating surfaces through said associate openings;
(c) a like plurality of adhering means for fastening said heat radiating surfaces of said integrated circuits to the bottom of said cooling block;
(d) a header arranged on the top of said cooling block and provided with a coolant entrance for inflow of said liquid coolant, a coolant exit for outflow of said liquid coolant, a coolant inflow path provided in the vicinity of said coolant entrance, for distributing said liquid coolant into a number of flow channels and a coolant discharge path provided in the vicinity of said coolant exit, for collecting said liquid coolant discharged from said flow channels; and (e) supply means for supplying said liquid coolant to said storage means of said cooling block.
(a) a substrate frame for holding said wiring substrate;
(b) a cooling block which includes a like plurality of storage means for storing a liquid coolant, said block having:
a bottom provided with openings associated to said storage means, so that each opening corresponds to a heat radiating surface of a facing integrated circuit of said plurality of integrated circuits; and a like plurality of spraying means associated with said openings for spraying said liquid coolant on heat radiating surfaces through said associate openings;
(c) a like plurality of adhering means for fastening said heat radiating surfaces of said integrated circuits to the bottom of said cooling block;
(d) a header arranged on the top of said cooling block and provided with a coolant entrance for inflow of said liquid coolant, a coolant exit for outflow of said liquid coolant, a coolant inflow path provided in the vicinity of said coolant entrance, for distributing said liquid coolant into a number of flow channels and a coolant discharge path provided in the vicinity of said coolant exit, for collecting said liquid coolant discharged from said flow channels; and (e) supply means for supplying said liquid coolant to said storage means of said cooling block.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP155634/1991 | 1991-05-30 | ||
| JP15563491 | 1991-05-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2070062A1 CA2070062A1 (en) | 1992-12-01 |
| CA2070062C true CA2070062C (en) | 1997-01-07 |
Family
ID=15610270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002070062A Expired - Fee Related CA2070062C (en) | 1991-05-30 | 1992-05-29 | Cooling structure for integrated circuits |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5285351A (en) |
| EP (1) | EP0516478A2 (en) |
| CA (1) | CA2070062C (en) |
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| US5515910A (en) * | 1993-05-03 | 1996-05-14 | Micro Control System | Apparatus for burn-in of high power semiconductor devices |
| US5606341A (en) * | 1995-10-02 | 1997-02-25 | Ncr Corporation | Passive CPU cooling and LCD heating for a laptop computer |
| US5831824A (en) * | 1996-01-31 | 1998-11-03 | Motorola, Inc. | Apparatus for spray-cooling multiple electronic modules |
| US5675473A (en) * | 1996-02-23 | 1997-10-07 | Motorola, Inc. | Apparatus and method for shielding an electronic module from electromagnetic radiation |
| US5802707A (en) * | 1996-03-28 | 1998-09-08 | Intel Corporation | Controlled bondline thickness attachment mechanism |
| US5687577A (en) * | 1996-04-10 | 1997-11-18 | Motorola, Inc. | Apparatus and method for spray-cooling an electronic module |
| US5718117A (en) * | 1996-04-10 | 1998-02-17 | Motorola, Inc. | Apparatus and method for spray-cooling an electronic module |
| US5731542A (en) * | 1996-05-23 | 1998-03-24 | Motorola, Inc. | Apparatus and method for mounting an electronic component to a substrate and method for spray-cooling an electronic component mounted to a substrate |
| US5777384A (en) * | 1996-10-11 | 1998-07-07 | Motorola, Inc. | Tunable semiconductor device |
| US5923086A (en) * | 1997-05-14 | 1999-07-13 | Intel Corporation | Apparatus for cooling a semiconductor die |
| US5818692A (en) * | 1997-05-30 | 1998-10-06 | Motorola, Inc. | Apparatus and method for cooling an electrical component |
| US6152215A (en) * | 1998-12-23 | 2000-11-28 | Sundstrand Corporation | High intensity cooler |
| US6317326B1 (en) * | 2000-09-14 | 2001-11-13 | Sun Microsystems, Inc. | Integrated circuit device package and heat dissipation device |
| US6836131B2 (en) * | 2002-08-16 | 2004-12-28 | Credence Systems Corp. | Spray cooling and transparent cooling plate thermal management system |
| US7102374B2 (en) * | 2002-08-16 | 2006-09-05 | Credence Systems Corporation | Spray cooling thermal management system and method for semiconductor probing, diagnostics, and failure analysis |
| US7078803B2 (en) * | 2002-09-27 | 2006-07-18 | Isothermal Systems Research, Inc. | Integrated circuit heat dissipation system |
| US7288895B2 (en) * | 2003-11-17 | 2007-10-30 | Intel Corporation | System to improve display efficiency based on recycling local heat source |
| US7269005B2 (en) * | 2003-11-21 | 2007-09-11 | Intel Corporation | Pumped loop cooling with remote heat exchanger and display cooling |
| GB0411714D0 (en) * | 2004-05-25 | 2004-06-30 | Rolls Royce Plc | A cooling arrangement |
| US7901191B1 (en) | 2005-04-07 | 2011-03-08 | Parker Hannifan Corporation | Enclosure with fluid inducement chamber |
| US20070290702A1 (en) * | 2006-06-19 | 2007-12-20 | Credence Systems Corporation | System and method for thermal management and gradient reduction |
| US20070291361A1 (en) * | 2006-06-19 | 2007-12-20 | Credence Systems Corporation | Lens housing with integrated thermal management |
| US9347987B2 (en) * | 2009-11-06 | 2016-05-24 | Intel Corporation | Direct liquid-contact micro-channel heat transfer devices, methods of temperature control for semiconductive devices, and processes of forming same |
| JP5782741B2 (en) | 2010-07-15 | 2015-09-24 | 富士通株式会社 | Electronics |
| US20120325436A1 (en) | 2011-06-27 | 2012-12-27 | Shedd Timothy A | High efficiency thermal management system |
| US9997434B2 (en) * | 2014-05-19 | 2018-06-12 | Hewlett Packard Enterprise Development Lp | Substrate sprayer |
| JP6160567B2 (en) * | 2014-06-17 | 2017-07-12 | 三菱電機株式会社 | Measuring device, measuring method |
| US9686887B2 (en) | 2014-09-15 | 2017-06-20 | Nicholas Michael D'Onofrio | Liquid cooled metal core printed circuit board |
| US10597286B2 (en) * | 2017-08-01 | 2020-03-24 | Analog Devices Global | Monolithic phase change heat sink |
| EP3977832A4 (en) | 2019-04-14 | 2023-07-26 | Jetcool Technologies, Inc. | Direct contact fluid based cooling module |
| CA3140764A1 (en) * | 2019-06-27 | 2020-12-30 | Hypertechnologie Ciara Inc. | Microgap system for cooling electronics with direct contact |
| WO2021022021A1 (en) * | 2019-07-31 | 2021-02-04 | Jetcool Technologies, Inc. | Re-entrant flow cold plate |
| US11640930B2 (en) | 2019-09-05 | 2023-05-02 | Mediatek Inc. | Semiconductor package having liquid-cooling lid |
| US20220015262A1 (en) * | 2020-07-09 | 2022-01-13 | Intel Corporation | Technologies for dynamic cooling in a multi-chip package with programmable impingement valves |
| US11963341B2 (en) | 2020-09-15 | 2024-04-16 | Jetcool Technologies Inc. | High temperature electronic device thermal management system |
| US20230071588A1 (en) * | 2021-09-07 | 2023-03-09 | Inventec (Pudong) Technology Corporation | Heat dissipation system and electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS60160150A (en) * | 1984-01-26 | 1985-08-21 | Fujitsu Ltd | Cooling device for integrated circuit |
| US4879632A (en) * | 1985-10-04 | 1989-11-07 | Fujitsu Limited | Cooling system for an electronic circuit device |
| US4791983A (en) * | 1987-10-13 | 1988-12-20 | Unisys Corporation | Self-aligning liquid-cooling assembly |
| JP2786193B2 (en) * | 1987-10-26 | 1998-08-13 | 株式会社日立製作所 | Semiconductor cooling device |
| JP2534749B2 (en) * | 1988-03-31 | 1996-09-18 | 株式会社東芝 | Semiconductor package |
| CA1303238C (en) * | 1988-05-09 | 1992-06-09 | Kazuhiko Umezawa | Flat cooling structure of integrated circuit |
| JP2708495B2 (en) * | 1988-09-19 | 1998-02-04 | 株式会社日立製作所 | Semiconductor cooling device |
| JP2658309B2 (en) * | 1988-12-07 | 1997-09-30 | 富士通株式会社 | Jet cooling semiconductor device |
| US5097385A (en) * | 1990-04-18 | 1992-03-17 | International Business Machines Corporation | Super-position cooling |
| JPH0451550A (en) * | 1990-06-20 | 1992-02-20 | Hitachi Ltd | Semiconductor integrated circuit device |
| US5168348A (en) * | 1991-07-15 | 1992-12-01 | International Business Machines Corporation | Impingment cooled compliant heat sink |
-
1992
- 1992-05-29 EP EP92304961A patent/EP0516478A2/en not_active Withdrawn
- 1992-05-29 CA CA002070062A patent/CA2070062C/en not_active Expired - Fee Related
- 1992-06-01 US US07/891,257 patent/US5285351A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0516478A2 (en) | 1992-12-02 |
| US5285351A (en) | 1994-02-08 |
| EP0516478A3 (en) | 1994-02-02 |
| CA2070062A1 (en) | 1992-12-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |