Analysis of Key Factors Affecting Case-to-Ambient Thermal Resistance in Thermal Modeling of Power Devices

Kaixin Wei, Peiji Shi (), Pili Bao, Chuanchao Liu and Yanzhou Qin
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Kaixin Wei: School of Automobile and Transportation, Tianjin University of Technology and Education, 1310 Dagu South Road, Hexi District, Tianjin 300222, China
Peiji Shi: School of Automobile and Transportation, Tianjin University of Technology and Education, 1310 Dagu South Road, Hexi District, Tianjin 300222, China
Pili Bao: School of Automobile and Transportation, Tianjin University of Technology and Education, 1310 Dagu South Road, Hexi District, Tianjin 300222, China
Chuanchao Liu: CIMC Safeway Technologies Co., Ltd., No. 159 Cheng Gang Road, Nantong 226003, China
Yanzhou Qin: State Key Laboratory of Engines, Tianjin University, 135 Ya Guan Road, Jinnan District, Tianjin 300350, China

Energies, 2024, vol. 17, issue 22, 1-14

Abstract: In the application of power converters, the ambient temperature ( T a ) experiences significant fluctuations. For the case-to-ambient resistance ( R ca ), apart from the influence of the material’s inherent properties, factors such as heat dissipation structure, working environment, and operational state can all have an impact on the R ca . Notably, while there are a limited number of models that consider environmental changes, existing models for calculating the R ca predominantly overlook the influence of varying working conditions or boundary conditions on the self-thermal resistance. Based on simulation and experimental analyses, the methods to calculate the R ca are outlined, and the key factors, inclusive of the coupling effects that influence the R ca in the thermal modeling of power devices, are thoroughly discussed.

Keywords: case-to-ambient thermal resistance; power devices; ambient temperature; thermal coupling effect; boundary conditions (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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