Dr Kawsar Ali
Stipendiary Lecturer in Engineering
I joined the Power Electronics Group of Oxford Engineering Science in 2018 as a Post-Doctoral Researcher after obtaining my Ph.D. from the National University of Singapore in Power Electronics.
Prior to my Ph.D. I worked at Indian Oil Corporation Limited, one of the largest oil and gas company in India, for three years where I was the maintenance-engineer-in-charge of a liquefied petroleum gas plant. I received my B.Tech. degree in Electrical Engineering in 2011 from the National Institute of Technology Durgapur, India.
I was teaching assistant for power electronics module (3rd year UG) and introduction to electrical engineering module (1st year UG) at different stages of my PhD at the National University of Singapore. As a postdoc at Oxford, I have tutored energy systems (A4) and worked as a lab demonstrator for the ECAD-FPGA coursework module. I was also engaged with the Opportunity Oxford programme as a lecturer.
My research experience and expertise fall in a broad range of power electronics applications — starting from microwatt-scale energy harvesting for the Internet of Things, through kilowatts of power conditioning for datacenter and electric vehicle applications, and up to megawatt-scale pulsed-power processing for biomedical applications.
My PhD work at the National University of Singapore was focused on the development of high-performance AC/DC power converters for datacenter and telecom loads. I invented a Silicon Carbide (SiC) MOSFET based nine-switch single-stage isolated three-phase AC-DC converter featuring 25% reduction of active device-count and a 67% reduction of output voltage ripple compared to the conventional back-to-back converter. To that end, I benchmarked, both analytically and experimentally, the application criteria of this class of topology, called the ‘nine-switch converter’, to achieve reduced conduction loss.
At Oxford, in collaboration with our colleagues at the Institute of Biomedical Engineering I have developed medical-grade power electronics for megawatt pulsed loads for trans-cranial magnetic stimulation (TMS) application. This MRC funded project aims to use power electronics as the enabling technology to achieve complete flexibility of the intensity, frequency, and shape of the magnetic pulses in TMS systems, and study their clinical response. The system design is characterised by its extreme modularity and it required as much, if not more, attention to details for mechanical design as it did for electrical/electronic design.
I am interested in exploiting the full capabilities of wide band gap (WBG) semiconductor devices, especially GaN, with the use of soft-switching resonant converter topologies and novel magnetics solutions.