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An analysis of the thermal interaction between components in power converter applications

An analysis of the thermal interaction between components in power converter applications

Shahjalal, Mohammad, Rishad Ahmed, MD, Lu, Hua ORCID: 0000-0002-4392-6562, Bailey, Chris ORCID: 0000-0002-9438-3879 and Forsyth, Andrew (2020) An analysis of the thermal interaction between components in power converter applications. IEEE Transactions on Power Electronics. ISSN 0885-8993 (Print), 1941-0107 (Online) (In Press) (doi:https://doi.org/10.1109/TPEL.2020.2969350)

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Abstract

Accurately predicting the temperature of semiconductor devices is very important in the initial design of power electronics converter. RC thermal models derived from well-known methods have some ability to predict the temperature. However, the accuracy is boundary condition specific, hence, these methods cannot be used in the reliability analysis. To make the thermal model more accurate and robust the factors contributing to discrepancies need to be analyzed carefully. These are power-module-materials’ non-linear properties, thermal grease layer and the cooling system (i.e., liquid-cooled cold plate). In this work, estimation of accurate RC parameters from FEA thermal model is demonstrated in COMSOL. The electrical model having temperature dependent power loss model is coupled to refined thermal model and solved in a circuit simulator, PLECS. The proposed method is applied in two applications: assessing thermal interaction between IGBTs and anti-parallel diodes in a half-bridge power module, and assessing thermal interaction among the discrete switches in an interleaved bidirectional DC-DC converter. Results show that the impact of material non-linearity, thermal grease layer and cooling boundary conditions are significant for accurate prediction of IGBT and diode temperatures. The proposed model is consistent to FEA results and differs by 2-6.5% comparing to the experimental results.

Item Type: Article
Uncontrolled Keywords: electro-thermal model, IGBT power module, circuit simulator, finite element analysis, DC-DC converter
Subjects: Q Science > QA Mathematics
Faculty / Department / Research Group: Faculty of Liberal Arts & Sciences
Faculty of Liberal Arts & Sciences > Centre for Numerical Modelling & Process Analysis (CNMPA)
Faculty of Liberal Arts & Sciences > Centre for Numerical Modelling & Process Analysis (CNMPA) > Computational Mechanics & Reliability Group (CMRG)
Faculty of Liberal Arts & Sciences > Department of Mathematical Sciences
Last Modified: 31 Jan 2020 09:35
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/26728

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