Analysis of Direct-Soldered Power Module / Heat Sink Thermal Interface for Electric Vehicle Applications

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dc.contributor.authorKim, Junhyungen
dc.contributor.committeechairLai, Jih-Shengen
dc.contributor.committeememberChen, Dan Y.en
dc.contributor.committeememberBoroyevich, Dushanen
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2014-03-14T20:34:40Zen
dc.date.adate2001-05-06en
dc.date.available2014-03-14T20:34:40Zen
dc.date.issued2001-04-27en
dc.date.rdate2002-05-06en
dc.date.sdate2001-05-01en
dc.description.abstractReducing the thermal impedance between power module and heat sink is important for high-power density, low-cost inverter applications. Mounting a power module by directly soldering it onto a heat sink can significantly reduce the thermal impedance at the module / heat sink interface, as compared to the conventional method of bolting the two together with a thermal grease or some other interface materials in between. However, a soldered interface typically contains a large number of voids, which results in local hot spots. This thesis describes approaches taken to reduce voids in the solder layer through surface treatment, solder paste selection, and adjustment in solder-reflow conditions. A 15MHz scanning acoustic microscope (SAM), a non-destructive inspection tool, was used to determine the void content at the module / heat sink interface. The experimental results show that a significant reduction in thermal resistance can be achieved by reducing the void content at the soldered module / heat sink interface. Moreover, a comparison of the thermal resistances in cases using the worst soldering, which contains the largest voided area, ThermstrateTM and thermal grease are presented. Thermal performances of the modules are studied by simulation with Flotherm.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-05012001-165030en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05012001-165030/en
dc.identifier.urihttp://hdl.handle.net/10919/32071en
dc.publisherVirginia Techen
dc.relation.haspartJUNHYUNGKIM_thesis.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectinverter and electric vehicleen
dc.subjectsolderingen
dc.subjectthermal resistanceen
dc.subjectvoid reductionen
dc.titleAnalysis of Direct-Soldered Power Module / Heat Sink Thermal Interface for Electric Vehicle Applicationsen
dc.typeThesisen
thesis.degree.disciplineElectrical and Computer Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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