Cited by 93Silicon Carbide Semiconductor TechnologiesSemiconductor materials and devicesRadiation Effects in Electronics

Temperature-Independent Gate-Oxide Degradation Monitoring of SiC MOSFETs Based on Junction Capacitances

Farhadi, Masoud, Yang, Fei, Pu, Shi, Vankayalapati, Bhanu Teja, Akin, Bilal·2021·IEEE Transactions on Power Electronics

Abstract

Gate-oxide degradation has been one of the major reliability challenges of SiC MOSFETs and should be monitored carefully to avoid unexpected power converter failures. Various precursors have been introduced in the literature for gate-oxide degradation monitoring. However, those proposed precursors are temperature dependent and it is highly challenging to eliminate temperature effects. In this article, two new temperature-independent precursors (Miller capacitance and gate-source capacitance changes) are proposed for gate-oxide degradation monitoring of SiC MOSFETs. During the accelerated aging tests under high electric field and high temperature, a consistent change in Miller capacitance and gate-source capacitance is reported for both common source and Kelvin source SiC MOSFETs. Also, the temperature sensitivity of each precursor is investigated. The proposed precursors enable the monitoring of gate-oxide degradation without decoupling the impact of package degradation. Based on the findings, a simple early warning in situ circuit is proposed to monitor gate-oxide aging. A comprehensive precursor comparison is provided to show the merits of the proposed precursors. Finally, the experimental results are presented to validate the efficacy of the in situ monitoring circuit.

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Crossref · 10.1109/tpel.2021.3049394

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Authors
Farhadi, M., Yang, F., Pu, S., Vankayalapati, B. T., & Akin, B.
Affiliations
The University of Texas at Dallas (US)
Venue
IEEE Transactions on Power Electronics
Published
2021-07
Volume
36
Issue
7
Pages
8308-8324
ISSN
  • 0885-8993 (ISSN-L)
  • 1941-0107
OpenAlex
W3118300733
Cited by
93
References
81
Citations by year
2026: 21 · 2025: 25 · 2024: 21 · 2023: 13 · 2022: 10 · 2021: 3
FWCI
3.46
Type
journal article
Language
en
Open access
closed
Locations
IEEE Transactions on Power Electronics (publishedVersion)
Funders
Semiconductor Research Corporation (SRC)/Texas Analog Center of Excellence (2712.026)
Topics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Silicon Carbide Semiconductor Technologies
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Semiconductor materials and devices
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Radiation Effects in Electronics
Keywords
SiC MOSFET, gate oxide degradation, degradation monitoring, Miller capacitance, gate-source capacitance, junction capacitance, accelerated aging, converter reliability

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