First Advisor

Mahima Gupta

Term of Graduation

Summer 2024

Date of Publication

8-14-2024

Document Type

Thesis

Degree Name

Master of Science (M.S.) in Electrical and Computer Engineering

Department

Electrical and Computer Engineering

Language

English

Subjects

Control Method, Efficiency, Electromagnetic Noise, Power Electronic Converters, PWM, Wide bandgap

Physical Description

1 online resource (xiii, 82 pages)

Abstract

Advancements in power semiconductor devices are enabling the design of better electrical power conversion systems. Wide Bandgap (WBG) switching devices using materials like Silicon Carbide and Gallium Nitride can operate at higher temperatures, voltages, and frequencies with faster turn-on/off periods, improving converter performance over silicon devices. However, WBG technologies are still new, and the rapid switching transitions of these devices lead to issues such as voltage overshoots, ringing, and electromagnetic interference, which need to be addressed for widespread adoption. This work introduces a new control method for reshaping the switching voltages, which overcomes the disadvantages of fast transition time without increasing system losses. In fact, the proposed method reduces overall switching losses.

Experimental results on a small-scale prototype have shown that silicon-based devices improved the efficiency of a 380W DC-DC converter from 78% to 87% and reduced noise by 20dB+. A maximum of 9% efficiency improvement was observed in a 220W 100Vin DC to 100Vrms three-phase AC converter. Using Silicon Carbide (SiC) devices for 750W DC-DC and DC-AC converters resulted in about 15dB to 20dB+ reduction in electrical noise and about 1% efficiency improvement in the proposed case compared to the conventional switching method. The system Electromagnetic Interference (EMI) performance under proposed and classical switching methods is tested and compared, and results show about 5dB to 10dB reduction in conducted EMI for frequencies above 1MHz to 30MHz range. The proposed control technique allows breaking the relationship between converter efficiency and electromagnetic noise in state-of-the-art solutions, thereby speeding up the adoption of new WBG-based power-switching devices by addressing challenges related to electromagnetic noise, leading to higher power density and efficiency.

Rights

©2024 Abhijeet Prem

In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

Persistent Identifier

https://archives.pdx.edu/ds/psu/42639

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