Source: http://www.google.com/patents/US5796584?dq=patent:+7360079
Timestamp: 2014-03-11 10:38:18
Document Index: 306815814

Matched Legal Cases: ['art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11']

Patent US5796584 - Bridge for power transistors with improved cooling - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA bridge is used to mount a heat generating electronic component such as an RF power amplifier to a heat sink plate or the like. The bridge is made of heat conductive material to assist in dissipating heat away from the power amplifier while providing an electromagnetic border between input and output...http://www.google.com/patents/US5796584?utm_source=gb-gplus-sharePatent US5796584 - Bridge for power transistors with improved coolingAdvanced Patent SearchPublication numberUS5796584 APublication typeGrantApplication numberUS 08/640,256Publication dateAug 18, 1998Filing dateApr 30, 1996Priority dateApr 30, 1996Fee statusLapsedAlso published asWO1997041600A1Publication number08640256, 640256, US 5796584 A, US 5796584A, US-A-5796584, US5796584 A, US5796584AInventorsJan MyrbergOriginal AssigneeTelefonaktiebolaget Lm EricssonExport CitationBiBTeX, EndNote, RefManPatent Citations (11), Referenced by (4), Classifications (11), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetBridge for power transistors with improved coolingUS 5796584 AAbstract A bridge is used to mount a heat generating electronic component such as an RF power amplifier to a heat sink plate or the like. The bridge is made of heat conductive material to assist in dissipating heat away from the power amplifier while providing an electromagnetic border between input and output sides of the amplifier. FOR POWER TRANSISTORS WITH IMPROVED COOLING
The invention claimed is: 1. A circuit module comprising:an underlying material onto which circuit elements are mounted; a top plate; and partitions located in a space between said underlying material and said top plate separating said space into compartments with said underlying material and said top plate operatively connected together, wherein said partitions includeat least one electronic device including a heat generating part and a heat conducting plate, said heat conducting plate having first and second mounting flanges extending out from said heat generating part; and at least one bridge securing an electronic device to an underlying material, said bridge comprising:a central part; a first side extension extending out from a first side of said central part and including a contour configured to permit a fastener to secure said first side extension and said first mounting flange to said underlying material; and a second side extension extending out from a second side of said central part and including a contour configured to permit a fastener to secure said second side extension and said second mounting flange to said underlying material, wherein a major surface of each of said first and second side extensions are in physical contact with said first and second mounting flanges and said top plate and said central part is adjacent said heat generating part when said bridge secures said electronic device to said underlying material. 2. A circuit module according to claim 1, wherein said central part, said first side extension and said second side extension of said bridge are integrally formed of a homogeneous material.
DETAILED DESCRIPTION FIG. 1 illustrates an electronic device which generates heat when operating. Specifically, the illustrated electronic device is a power transistor 10 including a heat generating part 11 which provides the transistor function and a heat conducting plate 12. The heat conducting plate 12 includes first and second mounting flanges 12a and 12b extending outward from transistor part 11. These flanges 12a and 12b conduct heat away from the transistor part 11 and are also used to secure the transistor 10 to underlying material 13. On forward and rear sides of the transistor part 11 (orthogonal to the flanges), electronic leads connect the transistor part 11 to other circuit elements.
The bridge 15 may be made of any heat conductive material such as aluminum, copper, iron, or any of a myriad of other materials. A prototype of the bridge was made of aluminum and gave a reduction of approximately 5 of a homogeneous material, but it can take the form of component parts joined together. A further improvement is to fill the 0.5 mm space between the central part of the bridge 15a and the heat generating part 11 of the transistor 10 with a heat conducting elastic material such as elastic silicon filler.
BRIEF DESCRIPTION OF THE DRAWINGS The present invention will now be described with reference to the exemplary embodiments illustrated in the accompanying drawings in which:
SUMMARY OF THE INVENTION The present invention addresses these and other problems by providing a novel heat sink in the form of a heat conducting bridge which includes a surface contour following the top outline of a heat generating electronic device such as a power transistor. The relatively large contact area between the bridge and the heat generating electronic device permits heat to dissipate from the top of the electronic device through the bridge and has the potential of continuing out through a larger heat dissipating surface.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS3611046 *Jan 24, 1969Oct 5, 1971Cross Electronics IncApparatus for mounting and-or cooling electrical devicesUS3909679 *Nov 7, 1974Sep 30, 1975Rock Ola Mfg CorpCabinet and heat sink for amplifier componentsUS3911327 *Jul 17, 1974Oct 7, 1975Ates Componenti ElettronMounting assembly for integrated circuits heat sink and clamp meansUS4446504 *Sep 13, 1983May 1, 1984Thermalloy IncorporatedMounting means with solderable studsUS4557225 *Jan 18, 1984Dec 10, 1985Mikuni Kogyo Kabushiki KaishaCombined housing and heat sink for electronic engine control system componentsUS4665467 *Feb 18, 1986May 12, 1987Ncr CorporationHeat transfer mounting deviceUS4717990 *May 30, 1986Jan 5, 1988Motorola, Inc.Double-shielded housing for RF circuitryUS5001601 *Jan 30, 1990Mar 19, 1991Grumman Aerospace CorporationModular cooling fixture for power transistorsUS5134545 *Jun 4, 1991Jul 28, 1992Compaq Computer CorporationInsulative cradle isolation structure for electrical componentsUS5291063 *Dec 23, 1991Mar 1, 1994Eni Div. Of Astec America, Inc.High-power RF device with heat spreader bushingUS5311395 *Oct 29, 1992May 10, 1994Ncr CorporationSurface mount heat sink* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS6753603 *Sep 17, 2001Jun 22, 2004Matsushita Electric Industrial Co., Ltd.Electronic equipment having insulating heat dissipation plateUS7094419Jun 24, 2003Aug 22, 2006Tenhuisen Kevor SMethod of obtaining immune cells from an animalUS7133285 *May 18, 2004Nov 7, 2006Yamaichi Electronics U.S.A., Inc.Electronics connector with heat sinkUS7501927 *Sep 9, 2005Mar 10, 2009Eldis Ehmki & Schmid OhgHigh-power resistor* Cited by examinerClassifications U.S. Classification361/707, 361/814, 257/E23.84, 257/E23.114, 174/16.3International ClassificationH01L23/40, H01L23/552Cooperative ClassificationH01L23/552, H01L23/4006European ClassificationH01L23/40B, H01L23/552Legal EventsDateCodeEventDescriptionOct 17, 2006FPExpired due to failure to pay maintenance feeEffective date: 20060818Aug 18, 2006LAPSLapse for failure to pay maintenance feesMar 8, 2006REMIMaintenance fee reminder mailedMar 5, 2002REMIMaintenance fee reminder mailedFeb 15, 2002FPAYFee paymentYear of fee payment: 4Jul 11, 1996ASAssignmentOwner name: TELEFONAKTIEBOLAGET LM ERICSSON, SWEDENFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MYRBERG, JAN;REEL/FRAME:008042/0828Effective date: 19960709RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google