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Partial Discharge Behavior on Power Module with High dv/dt Square Voltages

Aldawsari, Mohammed
http://rave.ohiolink.edu/etdc/view?acc_num=osu155563114540074

Abstract Details

2019, Master of Science, Ohio State University, Electrical and Computer Engineering.
Due to the high switching speed of next-generation semiconductor devices, partial discharge (PD) is more likely to occur compared to traditional devices. This necessitates a deep study of PD behaviors with high slew rate (dv/dt) impulse and square voltages. However, only a few studies have investigated PD behaviors on power modules with fast dv/dt repetitive square voltages. This is because building a generator with high dv/dt output and a controllable rising time is challenging. Also, PD detection becomes complicated as the slew rate becomes faster (high dv/dt). This report aims to study PD behaviors with such circumstances using direct bonded copper (DBC) samples designed with different configurations. The effect of electrode spacing and voltage waveform on PD phenomena are inspected in this work. The DBC samples are subjected to a repetitive square voltage using a 10-kV SiC-based pulse generator that provides high dv/dt outputs. That is because power modules are usually subjected to pulse width modulated (PWM) voltages. Direct bonded copper samples were designed with different configurations to examine the effect of the distance between the high voltage and low voltage electrodes. That is, each sample is specified by two parameters: trench distance d and chamfer radius r. A proper PD detection platform is designed to tackle the challenge of PD detection under ultra-fast dv/dt voltages. This platform includes a shunt resistor, a photomultiplier tube (PMT) and a high frequency current transformer (HFCT). The results illustrate that, for a fixed chamfer radius r, the partial discharge inception voltage (PDIV) increases as distance d increases. The increment takes a linear shape when r ≥ 0.5 mm while it takes a hump-like curve when r ≤ 0.3 mm. On the other hand, when d is fixed, PDIV shows a U-like curve as radius r increases. A similar square voltage that has a single pulse was applied on a specific DBC configuration to investigate the difference between single pulse and repetitive pulse square voltages. Experimental results reveal that, for a fixed d and r, PDIV has a higher value when the applied voltage is a single pulse voltage. I discuss and explain the results and observations in this thesis. Also, I provide suggestions at the end of this thesis to help both the academic and industrial fields improve power module design.
Jin Wang, Prof (Advisor)
Julia Zhang, Prof (Committee Member)
44 p.
Electrical Engineering

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Citations

  • Aldawsari, M. (2019). Partial Discharge Behavior on Power Module with High dv/dt Square Voltages [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu155563114540074

    APA Style (7th edition)

  • Aldawsari, Mohammed. Partial Discharge Behavior on Power Module with High dv/dt Square Voltages. 2019. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu155563114540074.

    MLA Style (8th edition)

  • Aldawsari, Mohammed. "Partial Discharge Behavior on Power Module with High dv/dt Square Voltages." Master's thesis, Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu155563114540074

    Chicago Manual of Style (17th edition)

osu155563114540074
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© 2019, some rights reserved.Creative Commons License Partial Discharge Behavior on Power Module with High dv/dt Square Voltages by Mohammed Aldawsari is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by The Ohio State University and OhioLINK.