Date of Award

1-1-2017

Document Type

Masters Thesis

Degree Name

M.S.

Organizational Unit

Daniel Felix Ritchie School of Engineering and Computer Science, Computer Science

First Advisor

Mohammad Matin, Ph.D.

Second Advisor

Jason Zhang

Third Advisor

Jack Donnelly

Keywords

Buck converter, Push-pull, Silicon carbide, Wide bandgap

Abstract

This thesis discusses the use of wide bandgap devices (SiC-MOSFET) in the design and implementation of various power converters (Push-pull inverter, Buck converter). Different parameters and scenarios were discussed and implemented for both silicon and silicon carbide MOSFET cases. A comparison between same circuits is done using silicon in the first case and silicon carbide MOSFET was implemented under the same conditions and parameters to investigate the silicon carbide MOSFET enhancement to the circuit. The modeling for silicon and silicon carbide MOSFET was created using the spice model provided from leading electronics companies as ROHM, CREE and INFINION. This spice model is provided by these companies to examine the effect of these components. This spice model can be examined using simulation software such as Multisim, PSpice, LTspice and others. The results focused on many aspects such as on Vout,Vmos stability, circuit efficiency and frequency change effect. It focused also on output power and MOSFET power loss because it is a very crucial aspect on any converter design. These results are done using the National Instrument simulation program (Multisim 14) and a sample of the results are validated using LT Spice.

In all tests and results it was found that SiC MOSFET made a significant improvement in the power efficiency and decreased power loss compared to Si MOSFET. Using SiC MOSFET in Push-Pull and Buck converter increased system efficiency and decreased MOSFET power loss. SiC is more immune against frequency change and performed better than Si MOSFET. Also, replacing Si MOSFET with SiC MOSFET added more voltage stability against the increase in load demand. These results will lead to design power converters with significant power loss and will decrease power dissipation. It will lead to better performance and a smaller circuit package because of the decrease in the heat sink and ventilation fans. It will save the power, decrease the cost and increase converter life time.

Publication Statement

Copyright is held by the author. User is responsible for all copyright compliance.

Rights Holder

Mustafa Nameer Albadri

Provenance

Received from ProQuest

File Format

application/pdf

Language

en

File Size

90 p.

Discipline

Engineering

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