Sungjae Ohn
About
Sungjae Ohn is from United States. Sungjae works in the following industries: "Higher Education", "Military", "Electrical & Electronic Manufacturing", and "Automotive". Sungjae is currently Sr. Power Electronics Control Engineer at Tesla, located in United States. In Sungjae's previous role as a Research Associate at Center for Power Electronics Systems, Virginia Tech, Sungjae worked in Arlington, Virginia until Jan 2020. Prior to joining Center for Power Electronics Systems, Virginia Tech, Sungjae was a Research Assistant at Center for Power Electronics Systems, Virginia Tech and held the position of Research Assistant at Washington D.C. Metro Area. Prior to that, Sungjae was a Research Assistant at Seoul National University, based in Gwanak-gu, Seoul, Korea from Mar 2013 to Jul 2015. Sungjae started working as Internship at LSIS in Dec 2011. From May 2009 to Mar 2011, Sungjae was Sergeant at United States Forces Korea (USFK).
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Sungjae Ohn's current jobs
Sungjae Ohn's past jobs
Analysis on paralleling of SiC inverters considering power-density, efficiency, and fault tolerance
Adviser: Dushan Boroyevich and Rolando Burgos Project lead for the development of two full-SiC grid-connected converters for 480 Vac, 800 Vdc A. Full-SiC three-level 40 kW photovoltaic (PV) inverter operating in interleaved triangular conduction mode for soft-switching (4 grads., and 1 u.g. intern) ▪ Lead the team to build a full-SiC PV inverter with switching frequency > 130 kHz, 98.6 % efficiency (Projected), 90 W⁄in^3 ▪ Development of modeling and control schemes for a three-phase soft-switching ac-dc converter ▪ Hardware prototyping and testing of 3 interleaved, 3-level ac-dc converters operating with soft-switching. ▪ DSP & CPLD coding, and verification of the proposed control schemes based on a control board with TMS320F28343 B. EMI strategies for a full-SiC three-level 20 kW uninterruptible power supply (3 grad., and 2 u.g. interns) ▪ Lead the team to build full-SiC UPS with switching frequency of 60 kHz, 98.9 % efficiency per stage, 25 W/in^3 ▪ Proposed an EMI model to predict the impact of the dc-dc stage and a battery-rack on CM EMI ▪ Proposed a modulation scheme to reduce the size of both dc-link capacitors and common-mode (CM) EMI filter ▪ Design, assembly, and testing of the ac-ac stage: Gate drivers, rectifier, inverter, and the filter stage
Adviser: Seung-Ki Sul ▪ Development of digital control board based on TMS320F28377D: Circuit design and PCB layout ▪ Topology development and evaluation for 4 MW Battery Energy Storage Systems (BESS): Simulation and assessment of topologies for high current applications ▪ Parameter estimation of PMSM drive, Assembly and testing of M-G set
Translation of equipment manuals in HVDC Lab
Served as KATUSA. 61st maintenance company, 194th Combat Sustainment Support Battalion (CSSB)