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A multiphysics modeling and experimental analysis of pressure contacts in power electronics applications

A multiphysics modeling and experimental analysis of pressure contacts in power electronics applications

Rajaguru, Pushparajah ORCID: 0000-0002-6041-0517, Ortiz-Gonzalez, Jose Angel, Lu, Hua ORCID: 0000-0002-4392-6562, Bailey, Chris ORCID: 0000-0002-9438-3879 and Alatise, Olawiwola (2017) A multiphysics modeling and experimental analysis of pressure contacts in power electronics applications. IEEE Transactions on Components, Packaging and Manufacturing Technology, 7 (6). pp. 893-900. ISSN 2156-3950 (Print), 2156-3985 (Online) (doi:https://doi.org/10.1109/TCPMT.2017.2688021)

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Abstract

This paper details a modeling and experimental assessment of the packaging process for a silicon carbide Schottky diode using pressure contacts. The work detailed in this paper is original, as it applies a combined electrothermomechanical modeling analysis to this packaging method supported by experimental validation. A key design objective for this packaging process is to identify suitable contact pad materials, heatsinks, and process variables such as clamping force to meet electrical, thermal, and reliability specifications. Molybdenum and aluminum graphite (ALG) have been identified as two suitable materials for the contact pads. Clamping forces ranging from 300 to 500 N and electric current ranging from 10 to 30 A have been investigated in terms of the resulting electrical and thermal contact resistances, temperatures, and stresses induced across the package. The performance of two heatsink designs with heat dissipation rates of 12893 and 4991 W/m2k has also been investigated. Both the modeling and initial experimental results detailed in this paper show that ALG provides better performance in terms of generating a lower average chip temperature. Both temperature and stress in the diode are predicted as a function of clamping force and load current. This will aid the packaging engineer to identify suitable process parameters to meet junction temperature requirements at different applied load currents.

Item Type: Article
Uncontrolled Keywords: Multiphysics modelling; Press-Pack assembly; Electronic Packaging
Subjects: Q Science > QA Mathematics
Faculty / Department / Research Group: Faculty of Architecture, Computing & Humanities
Faculty of Architecture, Computing & Humanities > Centre for Numerical Modelling & Process Analysis (CNMPA) > Computational Mechanics & Reliability Group (CMRG)
Faculty of Architecture, Computing & Humanities > Department of Mathematical Sciences
Last Modified: 20 Mar 2019 11:54
Selected for GREAT 2016: None
Selected for GREAT 2017: GREAT a
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/17113

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