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Analytical modeling of switching energy of silicon carbide Schottky diodes as functions of dIDS/dt and temperature

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Jahdi, Saeed, Alatise, Olayiwola M., Ran, Li and Mawby, P. A. (Philip A.) (2015) Analytical modeling of switching energy of silicon carbide Schottky diodes as functions of dIDS/dt and temperature. IEEE Transactions on Power Electronics, 30 (6). pp. 3345-3355. doi:10.1109/TPEL.2014.2333474 ISSN 0885-8993.

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Official URL: http://dx.doi.org/10.1109/TPEL.2014.2333474

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Abstract

SiC Schottky Barrier diodes (SiC SBD) are known to oscillate/ring in the output terminal when used as free-wheeling diodes in voltage-source converters. This ringing is due to RLC resonance among the diode capacitance, parasitic resistance, and circuit stray inductance. In this paper, a model has been developed for calculating the switching energy of SiC diodes as a function of the switching rate (dIDS/dt of the commutating SiC MOSFET) and temperature. It is shown that the damping of the oscillations increases with decreasing temperature and decreasing dIDS/dt. This in turn determines the switching energy of the diode, which initially decreases with decreasing dIDS/dt and subsequently increases with decreasing dIDS/dt thereby indicating an optimal dIDS/dt for minimum switching energy. The total switching energy of the diode can be subdivided into three phases namely the current switching phase, the voltage switching phase, and the ringing phase. Although the switching energy in the current switching phase decreases with increasing switching rate, the switching energy of the voltage and ringing phase increases with the switching rate. The model developed characterizes the dependence of diode's switching energy on temperature and dIDS/dt, hence, can be used to predict the behavior of the SiC SBD.

Item Type: Journal Article
Subjects: Q Science > QC Physics
T Technology > TP Chemical technology
T Technology > TS Manufactures
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH): Diodes, Schottky-barrier, Silicon carbide
Journal or Publication Title: IEEE Transactions on Power Electronics
Publisher: IEEE
ISSN: 0885-8993
Official Date: 2015
Dates:
DateEvent
2015Published
26 June 2014Available
Volume: 30
Number: 6
Number of Pages: 11
Page Range: pp. 3345-3355
DOI: 10.1109/TPEL.2014.2333474
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 13 June 2016
Date of first compliant Open Access: 13 June 2016
Funder: Engineering and Physical Sciences Research Council (EPSRC)
Grant number: EP/K034804/1

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