Comparison and Discussion on Shortcircuit Protections for Silicon-Carbide MOSFET Modules: Desaturation Versus Rogowski Switch-Current Sensor

Survivability of silicon-carbide (SiC) mosfet modules during short circuit (SC) is essential for modern power electronics systems due to large economic implications. SiC mosfet modules exhibit narrow SC withstand times and generally much lower SC robustness than silicon (Si) insulated-gate bipolar t...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2020-05, Vol.56 (3), p.2880-2893
Main Authors: Mocevic, Slavko, Wang, Jun, Burgos, Rolando, Boroyevich, Dushan, Jaksic, Marko, Stancu, Constantin, Peaslee, Brian
Format: Article
Language:English
Subjects:
Circuits
Desaturation
Design of experiments
ENGINEERING
gate-driver
Inductance
Insulated gate bipolar transistors
Logic gates
Modules
MOSFET
MOSFETs
Rogowski coil
Semiconductor devices
short circuit protection
Short circuits
SiC <inline-formula xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <tex-math notation="LaTeX"> scriptstyle{\text{MOSFET}}</tex-math> </inline-formula>
Silicon
Silicon carbide
Survivability
Switches
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Summary:Survivability of silicon-carbide (SiC) mosfet modules during short circuit (SC) is essential for modern power electronics systems due to large economic implications. SiC mosfet modules exhibit narrow SC withstand times and generally much lower SC robustness than silicon (Si) insulated-gate bipolar transistors (IGBTs). This puts a critical concern on their utilization, further stressing the importance of reliable protection. This article presents a comprehensive analysis and discussion on the SiC mosfet module SC protection and performance comparison between conventional desaturation detection, previously used for Si IGBT protection, and Rogowski switch-current sensor (RSCS) detection. In addition, this article presents the experimental design for soft turn- off as a reaction to the SC detection to avoid excessive overshoots during the abrupt turn- off of the SC current. To perform different types of SC with various fault inductances on different temperatures, and for the sake of fair comparison under the same conditions, a gate-driver unit for 1.2 kV SiC mosfet half-bridge modules is developed containing both detection methods. The results demonstrate that both methods are successful in protecting the module in all SC types, with superiority of the RSCS detection and concerns for desaturation detection in high-inductance and high dc-bus voltage SC events.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2020.2972816