An Analysis of the Thermal Interaction Between Components in Power Converter Applications

Shahjalal, Mohammad; Ahmed, Md Rishad; Lu, Hua; Bailey, Chris; Forsyth, Andrew J.

Abstract

Accurately predicting the temperature of semiconductor devices is very important in the initial design of the power electronics converter. RC thermal models derived from the 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’ nonlinear properties, thermal grease layer, and the cooling system (i.e., liquid-cooled cold plate). In this article, the estimation of accurate RC parameters from the FEA thermal model is demonstrated in COMSOL. The electrical model having temperature-dependent power loss model is coupled to a refined thermal model and solved in a circuit simulator, PLECS. The proposed method is applied in two applications: assessing thermal interaction between IGBTs and antiparallel 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 nonlinearity, thermal grease layer, and cooling boundary conditions are significant for accurate prediction of IGBT and diode temperatures. The proposed model is consistent with FEA results and differs by 2%–6.5% compared with the experimental results.

Citation

Shahjalal, M., Ahmed, M. R., Lu, H., Bailey, C., & Forsyth, A. J. (2020). An Analysis of the Thermal Interaction Between Components in Power Converter Applications. IEEE Transactions on Power Electronics, 35(9), 9082-9094. https://doi.org/10.1109/tpel.2020.2969350

• Journal Article Type: Article
• Acceptance Date: Jan 12, 2020
• Online Publication Date: Jan 27, 2020
• Publication Date: 2020-09
• Deposit Date: May 12, 2020
• Publicly Available Date: May 13, 2020
• Journal: IEEE Transactions on Power Electronics
• Print ISSN: 0885-8993
• Electronic ISSN: 1941-0107
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 35
• Issue: 9
• Pages: 9082-9094
• DOI: https://doi.org/10.1109/tpel.2020.2969350
• Keywords: Electrical and Electronic Engineering
• Public URL: https://nottingham-repository.worktribe.com/output/4424179
• Publisher URL: https://ieeexplore-ieee-org.ezproxy.nottingham.ac.uk/document/8970317
• Additional Information: © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.