An Improved Investigation into the Effects of the Temperature-Dependent Parasitic Elements on the Losses of SiC MOSFETs

This paper presents an improved investigation into the effects of temperature-dependent parasitic elements on the silicon carbide (SiC) MOSFET power losses. Based on the physical knowledge of MOSFET, a circuit-level loss analytical model is proposed, which takes the parasitic elements of the power d...

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Bibliographic Details
Published in:Applied sciences 2020-10, Vol.10 (20), p.7192
Main Authors: Zeng, Yinong, Yi, Yingping, Liu, Pu
Format: Article
Language:English
Subjects:
Accuracy
Circuit boards
Energy conversion efficiency
Energy use
Equations of state
Equivalent circuits
Materials
Metal oxide semiconductor field effect transistors
MOSFET
MOSFETs
parasitic elements
Parasitics (electronics)
Power converters
power losses
Printed circuits
Silicon carbide
Simulation
Temperature dependence
Temperature effects
Thermal properties
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Summary:This paper presents an improved investigation into the effects of temperature-dependent parasitic elements on the silicon carbide (SiC) MOSFET power losses. Based on the physical knowledge of MOSFET, a circuit-level loss analytical model is proposed, which takes the parasitic elements of the power devices and the stray inductances of the Printed Circuit Board (PCB) traces into consideration. The state equations derived from the equivalent circuit of each stage is solved by iteration to calculate the loss in the switching transients. In order to study the temperature characteristic completely, the key parameters needed in the calculation are extracted from power device test platform based on Agilent B1505A. The loss assessment of the proposed analytical model with varied elements has been successfully substantiated by the experimental results of a 400-V, 15-A double-pulse-test bench. Finally, some practical knowledge about loss mechanisms is given to help estimate the power losses and optimize the efficiency of power converters.
ISSN:2076-3417
2076-3417
DOI:10.3390/app10207192