Temperature-Independent Gate-Oxide Degradation Monitoring of SiC MOSFETs Based on Junction Capacitances
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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Device thermal impedance, saturation current, and miller capacitance are other parameters for aging monitoring.
“The device's thermal impedance [75], saturation current [76], and miller capacitance [77] are other parameters for aging monitoring.”
From AC Power Cycling Test Setup and Condition Monitoring Tools for SiC-Based Traction Inverters (2023) · cites this paper as [77]
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AC Power Cycling Test Setup and Condition Monitoring Tools for SiC-Based Traction Inverters
Farhadi, M., Vankayalapati, B. T., Sajadi, R., & Akin, B. (2023) · IEEE Transactions on Vehicular Technology · doi:10.1109/tvt.2023.3271251 · Cited by 24 · see citing works
“The device’s thermal impedance [75], saturation current [76], and miller capacitance [77] are other parameters for aging monitoring.”
BackgroundSelf-citationMurat Sezer, M., Akici, F., Afshar, M., Teja Vankayalapati, B., & Akin, B. (2025) · IEEE Transactions on Transportation Electrification · doi:10.1109/tte.2025.3546928 · Cited by 8 · see citing works
Self-citation
- 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
- Licence
- 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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