A Detailed Analytical Model of SiC MOSFETs for Bridge-Leg Configuration by Considering Staged Critical Parameters

The high operating voltage and switching speed of silicon carbide (SiC) MOSFETs have significant impacts on parasitic elements. This leads to a limitation in the performance of the devices. Especially in the bridge-leg configuration, the coupling of the parasitic elements, in the upper and lower bri...

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Main Authors: Dakang Yuan, Yiming Zhang, Xuhong Wang, Junxia Gao
Format: Article
Language:English
Published: IEEE 2021-01-01
Series:IEEE Access
Subjects:
Online Access:https://ieeexplore.ieee.org/document/9344663/
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spelling doaj-920e1e0903be45feaacfc7b2fa5c02412021-03-30T15:16:37ZengIEEEIEEE Access2169-35362021-01-019248232484710.1109/ACCESS.2021.30565469344663A Detailed Analytical Model of SiC MOSFETs for Bridge-Leg Configuration by Considering Staged Critical ParametersDakang Yuan0https://orcid.org/0000-0002-8410-3108Yiming Zhang1https://orcid.org/0000-0003-3859-6519Xuhong Wang2https://orcid.org/0000-0003-0676-7790Junxia Gao3https://orcid.org/0000-0002-0933-597XFaculty of Information Technology, Beijing University of Technology, Beijing, ChinaFaculty of Information Technology, Beijing University of Technology, Beijing, ChinaFaculty of Information Technology, Beijing University of Technology, Beijing, ChinaFaculty of Information Technology, Beijing University of Technology, Beijing, ChinaThe high operating voltage and switching speed of silicon carbide (SiC) MOSFETs have significant impacts on parasitic elements. This leads to a limitation in the performance of the devices. Especially in the bridge-leg configuration, the coupling of the parasitic elements, in the upper and lower bridge-legs, produces knock-on effects, which complicates the modeling development to reveal the underlying mechanisms. This paper presents a detailed piecewise linear analytical model for bridge-leg configured SiC MOSFETs, which takes into account their characteristics and all parasitic elements. The novelty of the proposed model lies in the fact that the critical parameters in each stage are distinguished flexibly and emphatically according to their influence weights to the corresponding main variables. Therefore, the complexity of the model which considers all parasitic elements is reduced but the critical impacts on the switching processes are carefully kept. The turn-on and turn-off processes are analyzed stage-by-stage in detail with the derived critical parameters equivalent circuits, and the mechanism underlying how each critical parameter influences the model is revealed individually. Furthermore, based on this model, the impact mechanisms and trends of the switching rate variation, the power loop attenuation oscillation, and the driver loop crosstalk phenomenon for different critical parameters are analyzed emphatically. Double pulse measurements with a 600 V/20A SiC MOSFETs based bridge-leg test circuit are used for the experimental verification of the accuracy of the model and the trends of the critical parameters' impacts.https://ieeexplore.ieee.org/document/9344663/Analytical modelbridge-legSiC MOSFETcritical parametersimpact mechanismsstaged
collection DOAJ
language English
format Article
sources DOAJ
author Dakang Yuan
Yiming Zhang
Xuhong Wang
Junxia Gao
spellingShingle Dakang Yuan
Yiming Zhang
Xuhong Wang
Junxia Gao
A Detailed Analytical Model of SiC MOSFETs for Bridge-Leg Configuration by Considering Staged Critical Parameters
IEEE Access
Analytical model
bridge-leg
SiC MOSFET
critical parameters
impact mechanisms
staged
author_facet Dakang Yuan
Yiming Zhang
Xuhong Wang
Junxia Gao
author_sort Dakang Yuan
title A Detailed Analytical Model of SiC MOSFETs for Bridge-Leg Configuration by Considering Staged Critical Parameters
title_short A Detailed Analytical Model of SiC MOSFETs for Bridge-Leg Configuration by Considering Staged Critical Parameters
title_full A Detailed Analytical Model of SiC MOSFETs for Bridge-Leg Configuration by Considering Staged Critical Parameters
title_fullStr A Detailed Analytical Model of SiC MOSFETs for Bridge-Leg Configuration by Considering Staged Critical Parameters
title_full_unstemmed A Detailed Analytical Model of SiC MOSFETs for Bridge-Leg Configuration by Considering Staged Critical Parameters
title_sort detailed analytical model of sic mosfets for bridge-leg configuration by considering staged critical parameters
publisher IEEE
series IEEE Access
issn 2169-3536
publishDate 2021-01-01
description The high operating voltage and switching speed of silicon carbide (SiC) MOSFETs have significant impacts on parasitic elements. This leads to a limitation in the performance of the devices. Especially in the bridge-leg configuration, the coupling of the parasitic elements, in the upper and lower bridge-legs, produces knock-on effects, which complicates the modeling development to reveal the underlying mechanisms. This paper presents a detailed piecewise linear analytical model for bridge-leg configured SiC MOSFETs, which takes into account their characteristics and all parasitic elements. The novelty of the proposed model lies in the fact that the critical parameters in each stage are distinguished flexibly and emphatically according to their influence weights to the corresponding main variables. Therefore, the complexity of the model which considers all parasitic elements is reduced but the critical impacts on the switching processes are carefully kept. The turn-on and turn-off processes are analyzed stage-by-stage in detail with the derived critical parameters equivalent circuits, and the mechanism underlying how each critical parameter influences the model is revealed individually. Furthermore, based on this model, the impact mechanisms and trends of the switching rate variation, the power loop attenuation oscillation, and the driver loop crosstalk phenomenon for different critical parameters are analyzed emphatically. Double pulse measurements with a 600 V/20A SiC MOSFETs based bridge-leg test circuit are used for the experimental verification of the accuracy of the model and the trends of the critical parameters' impacts.
topic Analytical model
bridge-leg
SiC MOSFET
critical parameters
impact mechanisms
staged
url https://ieeexplore.ieee.org/document/9344663/
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