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SiC Schottky Diodes and Polyphase Buck Converters

Galigekere, Veda Prakash N.
http://rave.ohiolink.edu/etdc/view?acc_num=wright1190064950

Abstract Details

2007, Master of Science in Engineering (MSEgr), Wright State University, Electrical Engineering.
The turn-on characteristics of a SiC Schottky diode are analyzed theoretically, by simulation, and by experiment. The static characteristics of SiC Schottky diodes and Si junction diodes are analyzed for normal and high temperatures. The effects of diffusion capacitance and junction capacitance on the turn-off transition of SiC Schottky diode have been analyzed theoretically. The turn-off transition of a SiC Schottky barrier diode is analyzed by modeling the metal-semiconductor junction capacitance considering the linear and the non-linear effects. Behavior of the linear and the non-linear metal-semiconductor junction capacitance models are evaluated exper- imentally. The performance of SiC Schottky diodes is compared to the performance of similarly rated Si junction diodes. The effect of diode reverse-recovery current on the primary switch of a PFC boost converter is analyzed by the aid of PSPICE simulations. A 250 W, PFC boost con- verter is designed and simulated. In the 250 W PFC boost converter, the perfor- mance of SiC Schottky diode and similarly rated Si junction diodes are evaluated. The PSPICE simulation models of a SiC Schottky diode and two Si junction diodes are compared and some important parameters are discussed and their effect on the turn-off transition of the diodes are presented. The principle and advantages of polyphase operation of buck converters is ana- lyzed. The design equations for a two-phase buck converter operating in CCM are derived. A two-phase 6 V/120 W (PWM) buck converter is designed and simulated using PSPICE. The design equations are verified by PSPICE simulation results.
Marian Kazimierczuk (Advisor)
91 p.
SiC; Schottky; Polyphase buck; Reverse recovery

Recommended Citations

Citations

  • Galigekere, V. P. N. (2007). SiC Schottky Diodes and Polyphase Buck Converters [Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1190064950

    APA Style (7th edition)

  • Galigekere, Veda Prakash. SiC Schottky Diodes and Polyphase Buck Converters. 2007. Wright State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1190064950.

    MLA Style (8th edition)

  • Galigekere, Veda Prakash. "SiC Schottky Diodes and Polyphase Buck Converters." Master's thesis, Wright State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=wright1190064950

    Chicago Manual of Style (17th edition)

wright1190064950
1,849
© 2007, all rights reserved.
This open access ETD is published by Wright State University and OhioLINK.