Ph.D., 2019, Stanford University
M.S., 2014, University of Michigan, Ann Arbor
B.S., 2009, Korea University
Power electronics, power semiconductor devices, wireless power transfer, magnetics
J.Choi Research Group Site
My primary research interests are in designing and implementing power conversion circuits. In power conversion systems, my research focuses on developing compact and efficient next-generation power electronics and extend this work to wireless power transfer for electric vehicles, biomedical devices and industrial applications. Also, I am interested in developing and utilizing wideband gap devices in high-power resonant converters operating at high frequencies.
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2021 National Science Foundation (NSF) CAREER Award
J. Choi, J. Xu, R. Makhoul, J. M. Rivas, “Implementing an impedance compression network to compensate for misalignments in a wireless power transfer system,” IEEE Transactions on Power Electronics, 2018 (early access)
J. Choi, D. Tsukiyama, Y. Tsuruda, J. M. Rivas, “High-frequency, high-power resonant inverter with eGaN EFT for wireless power transfer,” IEEE Transactions on Power Electronics, 2018
J. Choi, J. Xu, R. Makhoul, J. M. Rivas, “Design of a 13.56 MHz dc-to-dc resonant converter using an impedance compression network to mitigate misalignments in a wireless power transfer system,” IEEE Control and Modeling for Power Electronics (COMPEL), 2018
J. Choi, J. M. Rivas, “Implementing an impedance compression network to correct misalignment in a wireless power transfer,” IEEE Control and Modeling for Power Electronics (COMPEL), 2017
J. Choi, D. Tsukiyama, J. M. Rivas, “Comparison of SiC and eGaN devices in a 6.78 MHz 2.2 kW resonant inverter for wireless power transfer,” IEEE Energy Conversion Congress and Expo (ECCE), 2016
J. Choi, D. Tsukiyama, J. M. Rivas, “Evaluation of a 900 V SiC MOSFET in a 13.56 MHz 2 kW resonant inverter for wireless power transfer,” IEEE Control and Modeling for Power Electronics (COMPEL), 2016
J. Choi, D. Tsukiyama, Y. Tsuruda, J. M. Rivas, “13.56MHz 1.3kW Resonant Converter with GaN FET for Wireless Power Transfer,” IEEE Wireless Power Transfer Conference (WPTC), 2015
J. Choi, W. Liang, L. Raymond, J. M. Rivas, “A High frequency Resonant Converter Based on the Class Phi2 Inverter for Wireless Power Transfer,” IEEE Vehicle Technology Conference (VTC spring), 2014
L. Raymond, W. Liang, J. Choi, J. M. Rivas, "27 MHz Large Voltage Gain dc-dc Converter with a Reduced Stress Resonant Rectifier,” IEEE Energy Conversion Congress and Expo (ECCE), 2013
J. Choi, C. Lee, C. Kim, “Image resizing using a constrained linear system,” Institute of Electronics and Information Engineers conference in Korea, 2009
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