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Design and Performance Evaluation of Overcurrent Protection Schemes for Silicon Carbide (SiC) Power MOSFETs | IEEE Journals & Magazine | IEEE Xplore

Design and Performance Evaluation of Overcurrent Protection Schemes for Silicon Carbide (SiC) Power MOSFETs


Abstract:

Overcurrent protection of silicon carbide (SiC) metal–oxide–semiconductor field-effect transistors (MOSFETs) remains a challenge due to lack of practical knowledge. This ...Show More

Abstract:

Overcurrent protection of silicon carbide (SiC) metal–oxide–semiconductor field-effect transistors (MOSFETs) remains a challenge due to lack of practical knowledge. This paper presents three overcurrent protection methods to improve the reliability and overall cost of SiC MOSFET-based converters. First, a solid-state circuit breaker (SSCB) composed primarily by a Si IGBT and a commercial gate driver IC is connected in series with the dc bus to detect and clear overcurrent faults. Second, the desaturation technique using a sensing diode to detect the drain-source voltage under overcurrent faults is implemented as well. Third, a novel active overcurrent protection scheme through dynamic evaluation of fault current level is proposed. The design considerations and potential issues of the protection methods are described and analyzed in detail. A phase-leg configuration-based step-down converter is built to evaluate the performance of the protection schemes under various conditions, considering variation of fault type, decoupling capacitance, protection circuit parameters, etc. Finally, a comparison is made in terms of fault response time, temperature-dependent characteristics, and applications to help designers select a proper protection method.
Published in: IEEE Transactions on Industrial Electronics ( Volume: 61, Issue: 10, October 2014)
Page(s): 5570 - 5581
Date of Publication: 02 January 2014

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