US20100008047A1 - Passive thermal solution for hand-held devices - Google Patents
Passive thermal solution for hand-held devices Download PDFInfo
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- US20100008047A1 US20100008047A1 US12/586,065 US58606509A US2010008047A1 US 20100008047 A1 US20100008047 A1 US 20100008047A1 US 58606509 A US58606509 A US 58606509A US 2010008047 A1 US2010008047 A1 US 2010008047A1
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- casing
- gap filler
- thermal
- electronic package
- hand
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- 239000000945 filler Substances 0.000 claims abstract description 71
- 239000000463 material Substances 0.000 claims description 7
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 5
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 5
- 239000004925 Acrylic resin Substances 0.000 claims description 4
- 229920000106 Liquid crystal polymer Polymers 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 239000004952 Polyamide Substances 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 229920001083 polybutene Polymers 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 claims description 3
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 3
- 229920006345 thermoplastic polyamide Polymers 0.000 claims 2
- 230000007423 decrease Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
- H05K7/20436—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing
- H05K7/20445—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing the coupling element being an additional piece, e.g. thermal standoff
- H05K7/20463—Filling compound, e.g. potted resin
Definitions
- hand-held products such as cell phones and PDA's are equipped with features to provide multiple modes of communication, organization, storage, etc.
- FIG. 1 is an illustration of a hand-held device, which features a thermal gap filler above an electronic package and enclosed by a thermally conductive casing according to an embodiment of the present invention
- FIG. 2 is an illustration of a hand-held device, which features a thermal gap filler encompassing the entire area enclosed by the thermally conductive casing not occupied by the electronic package or other system components according to an embodiment of the present invention
- FIG. 3 is a cross-sectional view of a hand-held device featuring a heat spreader and a thermal gap filler above an electronic package according to an embodiment of the present invention
- FIG. 4 is a cross-sectional view of a hand-held device featuring an electronic package and an EMI shield exterior to the electronic package according to an embodiment of the present invention
- FIG. 5A is a chart of the maximum power dissipation ratio of a hand-held device according to varying embodiments of the present invention.
- FIG. 5B is a chart, corresponding with the embodiments in FIG. 5A , listing key thermal dissipation components and their thermal conductivities according to embodiments of the present invention.
- FIG. 6 is a chart which exhibits the use of a thermal gap filler and system enclosure with increasing thermal conductivities to decrease the electronic package and system enclosure temperatures according to embodiments of the present invention.
- the present invention includes a passive thermal solution for hand-held devices.
- the passive thermal solution may comprise a gap filler and a thermally conductive casing to dissipate heat produced by mechanical and/or electronic components in the hand-held device.
- the gap filler used in the hand-held device is a thermal gap filler.
- the thermal conductivity of the thermally conductive casing may be approximately 2.0 W/m-K or greater.
- FIG. 1 is a cross-sectional view of hand-held device 101 , which may feature thermally conductive casing 120 , thermal gap filler 110 , electronic package 100 , mechanical and electronic components 140 .
- thermally conductive casing 120 may enclose embedded components of hand-held device 101 .
- FIG. 1 also illustrates thermal gap filler 110 positioned flush between electronic package 100 and a portion of thermally conductive casing 120 .
- thermally conductive casing 120 may at least partially enclose, but not fully enclose, components of hand-held device 101 .
- hand-held device 101 may include a power supply such as a battery and may not operate for periods of time while not connected to an external source of power. Under such conditions, the power supply may provide limited power so that use of active cooling solutions, such as fans, etc, may be impractical.
- the operation of hand-held device 101 produces heat.
- the production of heat within hand-held device 101 can have a detrimental effect on the functionality of the embedded components.
- heat may dissipate to an ambient exterior to hand-held device 101 via conduction through thermal gap filler 110 and thermally conductive casing 120 .
- thermal gap filler 110 may be positioned between a portion of thermally conductive casing 120 and electronic package 100 .
- thermal gap filler 110 passively facilitates heat transfer from electronic package 100 to thermally conductive casing 120 .
- thermal gap filler 110 comprises acrylate resin.
- thermal conductivity of thermal gap filler 110 is approximately 1 W/m-K.
- thermal gap filler comprises silicone, the thermal conductivity of thermal gap filler 110 is approximately 10 W/m-K.
- thermal gap filler 110 may have a thermal conductivity in the range of 1 W/m-K to 10 W/m-K.
- the thermal gap filler 110 may have a thermal conductivity in a range between about 5 W/m-K to about 15 W/m-K.
- the thermal gap 110 filler may have a different thermal conductivity.
- a thermal gap filler 110 with a thermal conductivity of at least 1 W/m-K may sufficiently facilitate heat transfer to thermally conductive casing 120 .
- thermal gap filler 110 transfers heat to thermally conductive casing 120 well.
- thermal gap filler 110 acts as a heat conduit from which heat produced from electronic package 100 is transferred to thermally conductive casing 120 through thermal gap filler 110 .
- thermally conductive casing 120 may serve as the system enclosure to fully or partially enclose the embedded components of hand-held device 101 as illustrated in FIG. 1 .
- thermally conductive casing 120 comprises a polycarbonate material which features a thermal conductivity of approximately 0.2 W/m-K.
- Thermally conductive casing 120 may comprise a liquid crystalline polymer. In an embodiment when thermally conductive casing comprises a liquid crystalline polymer, the thermal conductivity of thermally conductive casing 120 is approximately 2.0 W/m-K.
- thermally conductive casing 120 may comprise a polyphenylene sulfide, which may have a thermal conductivity of approximately 20 W/m-K.
- the thermally conductive casing 120 may comprise a polybutene terephthalate, polypropylene, thermoplastic elastomer, polyamide, magnesium or another material.
- thermally conductive casing 120 may have a thermal conductivity in the range from 2.0 to 20 W/m-K although other thermal conductivities are also possible in other embodiments.
- thermally conductive casing 120 with a thermal conductivity of at least 2.0 W/m-K is sufficient to transfer heat to an ambient outside of hand-held device 101 .
- the temperature of thermal gap filler 110 is greater than the temperature of thermally conductive casing 120 such that heat is transferred from thermal gap filler 110 to thermally conductive casing 120 .
- heat is transferred from thermal gap filler 110 to a thermally conductive casing 120 and is subsequently transferred to an ambient outside of hand-held device 101 .
- an electronic package 100 may provide all or part of the electronic functionality of hand-held device 101 .
- heat 130 is conducted through thermal gap filler 110 throughout the inner area of hand-held device 101 .
- heat 130 is conducted through thermal gap filler 110 but may also be conducted through other components and in different directions throughout hand-held device 101 .
- heat 130 may increase the temperature of hand-held device 101 .
- the use of thermal gap filler 110 and thermally conductive casing 120 prevents the temperature of hand-held device 101 from elevating to affect the electrical or mechanical functions of the device.
- the temperature of hand-held device 101 may increase so much as to adversely affect the operation of the device.
- FIG. 2 is a cross-sectional view of hand-held device 200 , which features thermal gap filler 210 substantially filling the volume enclosed by thermally conductive casing 220 not filled by other mechanical or electronic components within thermally conductive casing 220 .
- thermal gap filler 210 may be positioned flush with electronic package 201 providing a path for heat 250 to thermally conductive casing 220 for subsequent dissipation from hand-held device 200 .
- FIG. 2 further illustrates mechanical and electronic components 240 in contact with thermal gap filler 210 .
- a thermal gap filler may partially fill the volume of thermally conductive casing 120 .
- a thermal gap filler may fill more of the volume of thermally conductive casing 120 than filled by thermal gap filler 110 in FIG. 1 , but not fill as much of the volume of thermally conductive casing as illustrated by thermal gap filler 210 in FIG. 2 .
- a heat spreader may be incorporated in the hand-held device. In an embodiment, a heat spreader may be incorporated to increase the thermal dissipation capabilities of hand-held devices.
- heat spreader 340 is positioned above electronic package 301 and between thermal gap filler 310 and thermally conductive casing 320 .
- a thermal interface material 325 may span a portion of thermally conductive casing 320 as illustrated.
- electronic package 301 may be positioned on substrate 330 according to an embodiment of the present invention.
- the hand-held device may incorporate an EMI shield.
- EMI shield 445 may be incorporated in hand-held device 400 to protect an ambient surrounding hand-held device 400 from the effects of electromagnetic waves.
- EMI shield 445 may be positioned above electronic package 400 and between two sections of thermal gap filler 410 .
- EMI shield 445 is positioned between two sections of thermal gap filler 410 to minimize contact resistance.
- EMI shield 445 may comprise metal and have a thermal conductivity of 150-400 W/m-K.
- the hand-held device of the present invention may exhibit better heat dissipation ability than hand-held devices currently in the art.
- FIG. 5A features chart 500 , which exhibits the thermal dissipation power (TDP) of current hand-held devices and that of multiple hand-held device embodiments of the present invention.
- FIG. 5B features chart 501 , which corresponds to chart 500 and provides the setup of a hand-held device according to varying embodiments along with the corresponding thermal conductivities (k) of the system enclosure and thermal gap filler.
- Chart 500 of FIG. 5A and chart 501 of FIG. 5B illustrate the thermal dissipation power of hand-held devices of the current state of the art and multiple embodiments of the present invention.
- an electronic package produces the same quantity of heat in the hand-held device embodiments listed in chart 500 and chart 501 .
- Case 1 (Baseline) may represent a hand-held device of the current state of the art.
- Baseline may represent a hand-held device which features a system enclosure with a thermal conductivity of 0.2 W/m-K.
- Case 2 may represent a hand-held device which features a system enclosure, a thermal gap filler with a thermal conductivity of 1 W/m-K, and a copper heat spreader.
- Case 3 may represent a hand-held device which features a system enclosure and a thermal gap filler with thermal conductivities of 20 W/m-K, 1 W/m-K respectively.
- Case 4 may represent a hand-held device which features a system enclosure and a thermal gap filler, with a thermal conductivity of 20 W/m-K, 1 W/m-K respectively, and a copper heat spreader.
- Case 5 may represent a hand-held device which features a system enclosure and a thermal gap filler with thermal conductivities of 20 W/m-K, 10 W/m-K respectively.
- the thermal dissipation power (TDP) of a hand-held device may be greater by the use of a thermal gap filler and thermally conductive casing as exhibited by Case 2 , Case 3 , Case 4 , and Case 5 in chart 500 .
- the thermal dissipation power (TDP) of a hand-held device may be greater with the use of a heat spreader as illustrated in Case 3 and Case 4 .
- the die junction temperature, T j , and system enclosure temperature, T skin may be less in a hand-held device comprising a thermal gap filler and system enclosure with increasing thermal conductivity properties.
- chart 600 corresponds with chart 500 and chart 501 in FIG. 5A and FIG. 5B with the exception of Case 5 .
- the die junction temperature and temperature of the system enclosure decreases with the use of a thermal gap filler and a system enclosure with increasing thermal conductivities.
- the use of a heat spreader within a hand-held device aids to decrease the temperature of both die and system enclosure as exhibited by Case 3 and Case 4 in chart 600 .
- the present invention's ability to dissipate heat outside the hand-held device may allow the device to function better.
- the hand-held device of the present invention may be manufactured such that the hand-held device of the present invention features a thermally conductive casing with a thermal conductivity greater than 2.0 W/m-K, an electronic package embedded inside the thermally conductive casing, and a thermal gap filler positioned between the thermally conductive casing and the electronic package.
- the hand-held device may be manufactured such that the thermal gap filler provides a heat path from the electronic package to the thermally conductive casing.
- the heat path created by the thermal gap filler is substantially free from air gaps.
- the hand-held device of the present invention may be manufactured such that the thermal gap filler substantially fills the volume enclosed by said thermally conductive casing not filled by other components within said thermally conductive casing.
Abstract
The present invention relates to a thermal solution for hand-held devices. In an embodiment, the present invention implements a thermal gap filler and a system enclosure for effective thermal management of high performance hand-held devices. In an embodiment, a hand-held device of the present invention increases the thermal power dissipation capability by reducing its system thermal resistance.
Description
- This application is a continuation of U.S. patent application Ser. No. 11/268,979, now U.S. Pat. No. 7,595,468, filed Nov. 7, 2005 and issued Sep. 29, 2009.
- Currently, hand-held products such as cell phones and PDA's are equipped with features to provide multiple modes of communication, organization, storage, etc.
- Additional features boost power consumption, which increases the challenge of thermal solutions for hand-held devices subject to ever-increasing size constraints. As a result, package and system power densities increase leading to significant temperature elevation. This may also lead to performance deterioration, package delamination, and reliability issues.
- The disclosed embodiments will be better understood from a reading of the following detailed description, taken in conjunction with the accompanying figures in the drawings in which:
-
FIG. 1 is an illustration of a hand-held device, which features a thermal gap filler above an electronic package and enclosed by a thermally conductive casing according to an embodiment of the present invention; -
FIG. 2 is an illustration of a hand-held device, which features a thermal gap filler encompassing the entire area enclosed by the thermally conductive casing not occupied by the electronic package or other system components according to an embodiment of the present invention; -
FIG. 3 is a cross-sectional view of a hand-held device featuring a heat spreader and a thermal gap filler above an electronic package according to an embodiment of the present invention; -
FIG. 4 is a cross-sectional view of a hand-held device featuring an electronic package and an EMI shield exterior to the electronic package according to an embodiment of the present invention; -
FIG. 5A is a chart of the maximum power dissipation ratio of a hand-held device according to varying embodiments of the present invention; -
FIG. 5B is a chart, corresponding with the embodiments inFIG. 5A , listing key thermal dissipation components and their thermal conductivities according to embodiments of the present invention; and -
FIG. 6 is a chart which exhibits the use of a thermal gap filler and system enclosure with increasing thermal conductivities to decrease the electronic package and system enclosure temperatures according to embodiments of the present invention. - In an embodiment, the present invention includes a passive thermal solution for hand-held devices. In an embodiment, the passive thermal solution may comprise a gap filler and a thermally conductive casing to dissipate heat produced by mechanical and/or electronic components in the hand-held device. In an embodiment, the gap filler used in the hand-held device is a thermal gap filler. In an embodiment, the thermal conductivity of the thermally conductive casing may be approximately 2.0 W/m-K or greater.
-
FIG. 1 is a cross-sectional view of hand-helddevice 101, which may feature thermallyconductive casing 120,thermal gap filler 110,electronic package 100, mechanical andelectronic components 140. As illustrated, thermallyconductive casing 120 may enclose embedded components of hand-helddevice 101.FIG. 1 also illustratesthermal gap filler 110 positioned flush betweenelectronic package 100 and a portion of thermallyconductive casing 120. In other embodiments, thermallyconductive casing 120 may at least partially enclose, but not fully enclose, components of hand-helddevice 101. In some embodiments, hand-helddevice 101 may include a power supply such as a battery and may not operate for periods of time while not connected to an external source of power. Under such conditions, the power supply may provide limited power so that use of active cooling solutions, such as fans, etc, may be impractical. - In an embodiment, the operation of hand-held
device 101 produces heat. The production of heat within hand-helddevice 101 can have a detrimental effect on the functionality of the embedded components. In an embodiment of the present invention, heat may dissipate to an ambient exterior to hand-helddevice 101 via conduction throughthermal gap filler 110 and thermallyconductive casing 120. - In an embodiment of the present invention,
thermal gap filler 110 may be positioned between a portion of thermallyconductive casing 120 andelectronic package 100. In an embodiment,thermal gap filler 110 passively facilitates heat transfer fromelectronic package 100 to thermallyconductive casing 120. In an embodiment,thermal gap filler 110 comprises acrylate resin. In an embodiment whenthermal gap filler 110 comprises an acrylate resin, the thermal conductivity ofthermal gap filler 110 is approximately 1 W/m-K. In an embodiment when thermal gap filler comprises silicone, the thermal conductivity ofthermal gap filler 110 is approximately 10 W/m-K. In an embodiment,thermal gap filler 110 may have a thermal conductivity in the range of 1 W/m-K to 10 W/m-K. In another embodiment, thethermal gap filler 110 may have a thermal conductivity in a range between about 5 W/m-K to about 15 W/m-K. In other embodiments, thethermal gap 110 filler may have a different thermal conductivity. - In an embodiment, a
thermal gap filler 110 with a thermal conductivity of at least 1 W/m-K may sufficiently facilitate heat transfer to thermallyconductive casing 120. In this embodiment,thermal gap filler 110 transfers heat to thermallyconductive casing 120 well. In an embodiment when the temperature ofelectronic package 100 is greater than the temperature ofthermal gap filler 110, heat is transferred fromelectronic package 100 tothermal gap filler 110. In an embodiment,thermal gap filler 110 acts as a heat conduit from which heat produced fromelectronic package 100 is transferred to thermallyconductive casing 120 throughthermal gap filler 110. - In an embodiment of the present invention, thermally
conductive casing 120 may serve as the system enclosure to fully or partially enclose the embedded components of hand-helddevice 101 as illustrated inFIG. 1 . In an embodiment, thermallyconductive casing 120 comprises a polycarbonate material which features a thermal conductivity of approximately 0.2 W/m-K. Thermallyconductive casing 120 may comprise a liquid crystalline polymer. In an embodiment when thermally conductive casing comprises a liquid crystalline polymer, the thermal conductivity of thermallyconductive casing 120 is approximately 2.0 W/m-K. In an embodiment, thermallyconductive casing 120 may comprise a polyphenylene sulfide, which may have a thermal conductivity of approximately 20 W/m-K. In other embodiments, the thermallyconductive casing 120 may comprise a polybutene terephthalate, polypropylene, thermoplastic elastomer, polyamide, magnesium or another material. In an embodiment, thermallyconductive casing 120 may have a thermal conductivity in the range from 2.0 to 20 W/m-K although other thermal conductivities are also possible in other embodiments. - In an embodiment, thermally
conductive casing 120 with a thermal conductivity of at least 2.0 W/m-K is sufficient to transfer heat to an ambient outside of hand-helddevice 101. In an embodiment, the temperature ofthermal gap filler 110 is greater than the temperature of thermallyconductive casing 120 such that heat is transferred fromthermal gap filler 110 to thermallyconductive casing 120. In an embodiment, heat is transferred fromthermal gap filler 110 to a thermallyconductive casing 120 and is subsequently transferred to an ambient outside of hand-helddevice 101. - In an embodiment, an
electronic package 100 may provide all or part of the electronic functionality of hand-helddevice 101. In an embodiment whenelectronic package 100 is a microprocessor and is active,heat 130 is conducted throughthermal gap filler 110 throughout the inner area of hand-helddevice 101. InFIG. 1 ,heat 130 is conducted throughthermal gap filler 110 but may also be conducted through other components and in different directions throughout hand-helddevice 101. In an embodiment,heat 130 may increase the temperature of hand-helddevice 101. In an embodiment, the use ofthermal gap filler 110 and thermallyconductive casing 120 prevents the temperature of hand-helddevice 101 from elevating to affect the electrical or mechanical functions of the device. In an embodiment, without the passive thermal solution provided bythermal gap filler 110 and thermallyconductive casing 120 the temperature of hand-helddevice 101 may increase so much as to adversely affect the operation of the device. -
FIG. 2 is a cross-sectional view of hand-helddevice 200, which featuresthermal gap filler 210 substantially filling the volume enclosed by thermallyconductive casing 220 not filled by other mechanical or electronic components within thermallyconductive casing 220. In an embodiment as illustrated inFIG. 2 ,thermal gap filler 210 may be positioned flush withelectronic package 201 providing a path forheat 250 to thermallyconductive casing 220 for subsequent dissipation from hand-helddevice 200.FIG. 2 further illustrates mechanical andelectronic components 240 in contact withthermal gap filler 210. - In yet another embodiment of the present invention, a thermal gap filler may partially fill the volume of thermally
conductive casing 120. In an embodiment, a thermal gap filler may fill more of the volume of thermallyconductive casing 120 than filled bythermal gap filler 110 inFIG. 1 , but not fill as much of the volume of thermally conductive casing as illustrated bythermal gap filler 210 inFIG. 2 . - In an embodiment of the present invention, a heat spreader may be incorporated in the hand-held device. In an embodiment, a heat spreader may be incorporated to increase the thermal dissipation capabilities of hand-held devices.
- In an embodiment as illustrated in
FIG. 3 ,heat spreader 340 is positioned aboveelectronic package 301 and betweenthermal gap filler 310 and thermallyconductive casing 320. In an embodiment, athermal interface material 325 may span a portion of thermallyconductive casing 320 as illustrated. Also,electronic package 301 may be positioned onsubstrate 330 according to an embodiment of the present invention. - In an embodiment of the present invention, the hand-held device may incorporate an EMI shield. In an embodiment as illustrated in
FIG. 4 ,EMI shield 445 may be incorporated in hand-helddevice 400 to protect an ambient surrounding hand-helddevice 400 from the effects of electromagnetic waves. In an embodiment as illustrated inFIG. 4 ,EMI shield 445 may be positioned aboveelectronic package 400 and between two sections ofthermal gap filler 410. In an embodiment,EMI shield 445 is positioned between two sections ofthermal gap filler 410 to minimize contact resistance. In an embodiment,EMI shield 445 may comprise metal and have a thermal conductivity of 150-400 W/m-K. - In an embodiment, the hand-held device of the present invention may exhibit better heat dissipation ability than hand-held devices currently in the art.
FIG. 5A featureschart 500, which exhibits the thermal dissipation power (TDP) of current hand-held devices and that of multiple hand-held device embodiments of the present invention.FIG. 5B featureschart 501, which corresponds to chart 500 and provides the setup of a hand-held device according to varying embodiments along with the corresponding thermal conductivities (k) of the system enclosure and thermal gap filler. - Chart 500 of
FIG. 5A and chart 501 ofFIG. 5B illustrate the thermal dissipation power of hand-held devices of the current state of the art and multiple embodiments of the present invention. In an embodiment, an electronic package produces the same quantity of heat in the hand-held device embodiments listed inchart 500 andchart 501. In an embodiment as exhibited inchart 500 ofFIG. 5A , Case 1 (Baseline) may represent a hand-held device of the current state of the art. In an embodiment, Baseline may represent a hand-held device which features a system enclosure with a thermal conductivity of 0.2 W/m-K. In an embodiment,Case 2 may represent a hand-held device which features a system enclosure, a thermal gap filler with a thermal conductivity of 1 W/m-K, and a copper heat spreader. In an embodiment,Case 3 may represent a hand-held device which features a system enclosure and a thermal gap filler with thermal conductivities of 20 W/m-K, 1 W/m-K respectively. In an embodiment,Case 4 may represent a hand-held device which features a system enclosure and a thermal gap filler, with a thermal conductivity of 20 W/m-K, 1 W/m-K respectively, and a copper heat spreader. In an embodiment,Case 5 may represent a hand-held device which features a system enclosure and a thermal gap filler with thermal conductivities of 20 W/m-K, 10 W/m-K respectively. - In an embodiment as illustrated in
FIG. 5A , the thermal dissipation power (TDP) of a hand-held device may be greater by the use of a thermal gap filler and thermally conductive casing as exhibited byCase 2,Case 3,Case 4, andCase 5 inchart 500. In an embodiment as further illustrated inchart 500, the thermal dissipation power (TDP) of a hand-held device may be greater with the use of a heat spreader as illustrated inCase 3 andCase 4. - In an embodiment as illustrated in
chart 600 ofFIG. 6 , the die junction temperature, Tj, and system enclosure temperature, Tskin, may be less in a hand-held device comprising a thermal gap filler and system enclosure with increasing thermal conductivity properties. In an embodiment, chart 600 corresponds withchart 500 and chart 501 inFIG. 5A andFIG. 5B with the exception ofCase 5. As exhibited inchart 600, the die junction temperature and temperature of the system enclosure decreases with the use of a thermal gap filler and a system enclosure with increasing thermal conductivities. Also, the use of a heat spreader within a hand-held device aids to decrease the temperature of both die and system enclosure as exhibited byCase 3 andCase 4 inchart 600. In an embodiment, the present invention's ability to dissipate heat outside the hand-held device may allow the device to function better. - In an embodiment, the hand-held device of the present invention may be manufactured such that the hand-held device of the present invention features a thermally conductive casing with a thermal conductivity greater than 2.0 W/m-K, an electronic package embedded inside the thermally conductive casing, and a thermal gap filler positioned between the thermally conductive casing and the electronic package. In an embodiment, the hand-held device may be manufactured such that the thermal gap filler provides a heat path from the electronic package to the thermally conductive casing. In an embodiment, the heat path created by the thermal gap filler is substantially free from air gaps. In yet another embodiment, the hand-held device of the present invention may be manufactured such that the thermal gap filler substantially fills the volume enclosed by said thermally conductive casing not filled by other components within said thermally conductive casing.
Claims (20)
1. A device comprising:
a casing;
an electronic package at least partially enclosed in the casing; and
a gap filler adjacent to the electronic package,
wherein:
the device has EMI shielding properties.
2. The device of claim 1 further comprising:
a heat spreader adjacent to the gap filler.
3. The device of claim 1 wherein:
the casing is a thermally conductive casing.
4. The device of claim 3 wherein:
the thermally conductive casing comprises a material selected from the group consisting of polyphenylene sulfide, liquid crystalline polymer, magnesium, polyphenylene sulfide, polypropylene, thermoplastic elastomer, polyamide, and polybutene terephthalate.
5. The device of claim 3 wherein:
a thermal conductivity of the thermally conductive casing is greater than approximately 2 W/m-K.
6. The device of claim 5 wherein:
the thermal conductivity of the thermally conductive casing is in a range from 2 W/m-K to 20 W/m-K.
7. The device of claim 5 wherein:
the gap filler provides a heat path from the electronic package to the thermally conductive casing, wherein the heat path is substantially free of air gaps.
8. The device of claim 1 wherein:
the gap filler comprises a material selected from the group consisting of acrylate resin and silicone.
9. The device of claim 1 wherein:
a thermal conductivity of the gap filler is greater than about 1 W/m-K.
10. The device of claim 1 wherein:
the gap filler substantially fills a volume enclosed by the casing not filled by other components within the casing.
11. The device of claim 1 wherein:
the device is a hand-held, portable device.
12. The device of claim 1 further comprising:
an EMI shield within the casing,
wherein:
the EMI shielding properties are provided by the EMI shield; and
a thermal conductivity of the EMI shield is greater than 150 W/m-K.
13. A thermally-enhanced shielding solution comprising:
a casing;
an electronic package at least partially enclosed in the casing;
an EMI shield adjacent to the electronic package; and
a thermal gap filler between the EMI shield and the electronic package,
wherein:
a thermal conductivity of the thermal gap filler is greater than about 1 W/m-K;
the thermal gap filler provides a heat path from the electronic package to the casing; and
the heat path is substantially free of air gaps such that the thermal gap filler substantially fills a volume enclosed by the casing not filled by other components within the casing.
14. The thermally-enhanced shielding solution of claim 13 further comprising:
a heat spreader adjacent to the thermal gap filler.
15. The thermally-enhanced shielding solution of claim 13 wherein:
the casing comprises a material selected from the group consisting of polyphenylene sulfide, liquid crystalline polymer, magnesium, polyphenylene sulfide, polypropylene, thermoplastic elastomer, polyamide, and polybutene terephthalate; and
the gap filler comprises a material selected from the group consisting of acrylate resin and silicone.
16. A device comprising:
a casing;
an electronic package at least partially enclosed in the casing;
a gap filler adjacent to the casing; and
a heat spreader adjacent to the gap filler,
wherein:
a space between the electronic package and the casing has EMI shielding properties.
17. The device of claim 16 further comprising:
an EMI shield in the space between the electronic package and the casing.
18. The device of claim 17 wherein:
the EMI shield has a thermal conductivity greater than 150 W/m-K.
19. The device of claim 18 wherein:
the EMI shield has a thermal conductivity in a range between 150 W/m-K and 400 W/m-K.
20. The device of claim 17 wherein:
the EMI shield is disposed between a first portion and a second portion of the gap filler.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/586,065 US20100008047A1 (en) | 2005-11-07 | 2009-09-15 | Passive thermal solution for hand-held devices |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/268,979 US7595468B2 (en) | 2005-11-07 | 2005-11-07 | Passive thermal solution for hand-held devices |
US12/586,065 US20100008047A1 (en) | 2005-11-07 | 2009-09-15 | Passive thermal solution for hand-held devices |
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US12/586,065 Abandoned US20100008047A1 (en) | 2005-11-07 | 2009-09-15 | Passive thermal solution for hand-held devices |
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US8169781B2 (en) * | 2010-04-06 | 2012-05-01 | Fsp Technology Inc. | Power supply and heat dissipation module thereof |
US20150195956A1 (en) * | 2014-01-08 | 2015-07-09 | Enphase Energy, Inc. | Double insulated heat spreader |
JP2015192035A (en) * | 2014-03-28 | 2015-11-02 | 株式会社オートネットワーク技術研究所 | Circuit unit and manufacturing method of the same |
US20170364754A1 (en) * | 2016-06-21 | 2017-12-21 | Zmodo Technology Shenzhen Corp. Ltd. | Video surveillance display system |
US10359812B2 (en) * | 2017-12-12 | 2019-07-23 | Motorola Mobility Llc | Device component exposure protection |
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US8477499B2 (en) | 2009-06-05 | 2013-07-02 | Laird Technologies, Inc. | Assemblies and methods for dissipating heat from handheld electronic devices |
US7965514B2 (en) | 2009-06-05 | 2011-06-21 | Laird Technologies, Inc. | Assemblies and methods for dissipating heat from handheld electronic devices |
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 |
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US9329646B2 (en) * | 2014-03-20 | 2016-05-03 | Qualcomm Incorporated | Multi-layer heat dissipating apparatus for an electronic device |
US10986723B2 (en) * | 2018-10-16 | 2021-04-20 | Ingersoll-Rand Industrial U.S., Inc. | Heat sink tray for printed circuit boards |
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US8169781B2 (en) * | 2010-04-06 | 2012-05-01 | Fsp Technology Inc. | Power supply and heat dissipation module thereof |
US20150195956A1 (en) * | 2014-01-08 | 2015-07-09 | Enphase Energy, Inc. | Double insulated heat spreader |
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US20170364754A1 (en) * | 2016-06-21 | 2017-12-21 | Zmodo Technology Shenzhen Corp. Ltd. | Video surveillance display system |
US10359812B2 (en) * | 2017-12-12 | 2019-07-23 | Motorola Mobility Llc | Device component exposure protection |
US10802546B2 (en) | 2017-12-12 | 2020-10-13 | Motorola Mobility Llc | Device component exposure protection |
Also Published As
Publication number | Publication date |
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US7595468B2 (en) | 2009-09-29 |
US20070103849A1 (en) | 2007-05-10 |
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