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Multi-timescale Thermal Network Model of Power Devices Based on POD Algorithm

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posted on 2024-01-11, 13:08 authored by Yao Zhao, Zhiqiang Wang, Dan Luo, Cuili Chen, Bing Ji, Guofeng Li

The heat transfer of power devices has the characteristics of multi-timescale. However, the traditional thermal network model is difficult to predict the temperature information of power devices at multi-timescale accurately. This paper proposes a multi-timescale thermal network model for power devices, with MOSFET as an example. First, we establish a finite element model for temperature calculation of power devices and then reduce the order of the finite element model based on the proper orthogonal decomposition (POD) algorithm. The reduced order model is converted into an equivalent circuit model by the node voltage method and integrated into the circuit simulation software. To demonstrate its general applicability, this paper also establishes thermal network models for both IGBT and SiC MOSFET devices, validates the multi-time scale thermal network models through ANSYS/Transient Thermal software and experiments. The temperature calculation results of the three power devices all indicate that the proposed multi-time scale thermal network model can calculate the temperature of power devices faster than ANSYS/Transient Thermal model, and has less than 5% error under test conditions. This paper is accompanied by a video demonstrating a comparison of the computational speed of the multi-timescale thermal network model with a finite element model. Finally, a case study of junction temperature calculation in a Buck converter is presented to illustrate the application method of the thermal network model.

History

Author affiliation

School of Engineering, University of Leicester

Version

  • AM (Accepted Manuscript)

Published in

IEEE Transactions on Power Electronics

Pagination

1 - 18

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

issn

0885-8993

eissn

1941-0107

Copyright date

2023

Available date

2024-01-11

Language

en

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