Electro-Thermal Simulation for Predicting the Temperature of SiC Dies in the Power Module of a High Frequency Operating Power Converter

Conference: PCIM Europe 2018 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
06/05/2018 - 06/07/2018 at Nürnberg, Deutschland

Proceedings: PCIM Europe 2018

Pages: 4Language: englishTyp: PDF

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Nakamura, Yohei; Otake, Hirotaka; Nakakohara, Yusuke; Sakairi, Hiroyuki; Kuroda, Naotaka (ROHM Co., Ltd., Japan)
Evans, Tristan M.; Nakahara, Ken (University of Arkansas, USA)

In the proposed study, an accurate electro-thermal simulation was performed to predict the temperature of SiC metal-oxide-semiconductor field-effect transistor (MOSFET) chips in a power module used for constructing a buck converter. This method is capable of reproducing an uncommon characteristic of SiC MOSFETs, which is the negative gate-voltage of the SiC MOSFETs increases the forward operation voltage of its body diode. This yields a precise estimate of power dissipation in the buck converter and stationary-state temperature of the SiC MOSFET. The buck converter selected for the experiment comprised a 1200 V, 40 A power module operating at switching frequencies varying from 50 to 350 kHz. The deviation ratio between the measured and simulated temperature results was less than 6.0%, even for the worst-case scenarios.