Recent Submissions

  • Recent progress of Ga2O3 power technology: large-area devices, packaging and applications 

    Qin, Yuan; Wang, Zhengpeng; Sasaki, Kohei; Ye, Jiandong; Zhang, Yuhao (IOP Publishing, 2023-06)
    Benefitted from progress on the large-diameter Ga2O3 wafers and Ga2O3 processing techniques, the Ga2O3 power device technology has witnessed fast advances toward power electronics applications. Recently, reports on large-area ...
  • Vertical GaN diode BV maximization through rapid TCAD simulation and ML-enabled surrogate model 

    Lu, Albert; Marshall, Jordan; Wang, Yifan; Xiao, Ming; Zhang, Yuhao; Wong, Hiu Yung (Pergamon-Elsevier Science, 2022-12)
    In this paper, two methodologies are used to speed up the maximization of the breakdown voltage (BV) of a vertical GaN diode that has a theoretical maximum BV of -2100 V. Firstly, we demonstrated a 5X faster accurate ...
  • Global Intergrid for Sustainable Energy Abundance 

    Boroyevich, Dushan; Cvetkovic, Igor; Dong, Dong (IEEE Power Electronics Society, 2022-06-04)
    Invited Poster for Session on Brainstorming for Game-Changing Ideas.
  • Multidimensional device architectures for efficient power electronics 

    Zhang, Yuhao; Udrea, Florin; Wang, Han (Springer Nature, 2022-11-17)
    Power semiconductor devices are key to delivering high-efficiency energy conversion in power electronics systems, which is critical in efforts to reduce energy loss, cut carbon dioxide emissions and create more sustainable ...
  • Present and Future of DC Circuit Breakers for HVDC Grids 

    Davidson, Colin; Grieshaber, Wolfgang; Modeer, Tomas; Smith, David; Yang, Bing; Yu, Zhanqing; Zhang, Richard (IEEE, 2023-11-15)
  • Design of a 10 kV SiC MOSFET-based high-density, high-efficiency, modular medium-voltage power converter 

    Mocevic, Slavko; Yu, Jianghui; Fan, Boran; Sun, Keyao; Xu, Yue; Stewart, Joshua; Rong, Yu; Song, He; Mitrovic, Vladimir; Yan, Ning; Wang, Jun; Cvetkovic, Igor; Burgos, Rolando; Boroyevich, Dushan; DiMarino, Christina; Dong, Dong; Motwani, Jayesh Kumar; Zhang, Richard (IEEE, 2022-03)
    Simultaneously imposed challenges of high-voltage insulation, high dv/dt, high-switching frequency, fast protection, and thermal management associated with the adoption of 10 kV SiC MOSFET, often pose nearly insurmountable ...
  • Role of power electronics in Grid 3.0 

    Zhang, Richard (IEEE, 2022-12)
  • A SiC-Based Liquid-Cooled Electric Vehicle Traction Inverter Operating at High Ambient Temperature 

    Zhang, Chi; Srdic, Srdjan; Lukic, Srdjan; Wang, Jun; Burgos, Rolando (China Power Supply Society, 2022-06-30)
    This paper describes the design process of a high-power-density 100 kW (34 kW/L) traction inverter for electric vehicles, operating at an ambient temperature of 105 °C. A detailed thermal analysis is performed based on the ...
  • Superjunction Power Transistors With Interface Charges: A Case Study for GaN 

    Ma, Yunwei; Xiao, Ming; Zhang, Ruizhe; Wang, Han; Zhang, Yuhao (2019-12-13)
    Recent progress in p-GaN trench-filling epitaxy has shown promise for the demonstration of GaN superjunction (SJ) devices. However, the presence of n-type interface charges at the regrowth interfaces has been widely observed. ...
  • Structural Resemblance Between Droop Controllers and Phase-Locked Loops 

    Zhong, Qing-Chang; Boroyevich, Dushan (IEEE, 2016)
    It is well known that droop control is fundamental to the operation of power systems and now the parallel operation of inverters, while phase-locked loops (PLLs) are widely adopted in modern electrical engineering. In this ...
  • Two-stage multichannel LED driver with CLL resonant circuit 

    Electrical and Computer Engineering; Center for Power Electronics Systems; Virginia Tech Intellectual Properties, Inc.; Li, Qiang; Lee, Fred C.; Chen, Xuebing; Huang, Daocheng (United States Patent and Trademark Office, 2017-01-10)
    In a two-stage power converter providing voltage regulation in a first stage, zero voltage switching (ZVS) is provided in switches in an unregulated, constant frequency second stage of a two-stage power converter by an ...
  • Method and apparatus for driving a power device 

    Electrical and Computer Engineering; Center for Power Electronics Systems; Virginia Tech Intellectual Properties, Inc.; Toyota Motor Engineering & Manufacturing North American, Inc.; Wang, Chi-Ming; Shin, Jongwon; Ngo, Khai D. (United States Patent and Trademark Office, 2016-12-27)
    Aspects of the disclosure provide a circuit for driving a power switch. The circuit includes a first circuit configured to provide a charging current to charge a control terminal of the power switch, a second circuit ...
  • Parallel devices having balanced switching current and power 

    Electrical and Computer Engineering; Center for Power Electronics Systems; Virginia Tech Intellectual Properties, Inc.; Toyota Motor Engineering & Manufacturing North American, Inc.; Wang, Chi-Ming; Mao, Yincan; Miao, Zichen; Ngo, Khai D. (United States Patent and Trademark Office, 2018-10-30)
    A power circuit includes a power source for providing electrical power and two driving transistors being disposed in parallel and receiving electrical power from the power source. Each of the two driving transistors includes ...
  • Transient performance improvement for constant on-time power converters 

    Electrical and Computer Engineering; Center for Power Electronics Systems; Virginia Tech Intellectual Properties, Inc.; Li, Qiang; Liu, Pei-Hsin; Lee, Fred C.; Bari, Syed (United States Patent and Trademark Office, 2018-10-23)
    Response of a variable frequency switching constant on-time or adaptive on-time controlled power converter to a large step-up or step-down change in load is improved with a simple circuit that detects magnitude and polarity ...
  • Low profile coupled inductor substrate with transient speed improvement 

    Electrical and Computer Engineering; Center for Power Electronics Systems; Virginia Tech Intellectual Properties, Inc.; Li, Qiang; Lee, Fred C.; Su, Yipeng; Hou, Dongbin (United States Patent and Trademark Office, 2018-10-23)
    A low profile inductor structure suitable for use in a high power density power converter has one or more windings formed by vias through a thin, generally planar body of magnetic material forming the inductor core and ...
  • Multi-step simplified optimal trajectory control (SOTC) based on only Vo and I load 

    Electrical and Computer Engineering; Center for Power Electronics Systems; Virginia Tech Intellectual Properties, Inc.; Li, Qiang; Lee, Fred C.; Fei, Chao; Feng, Weiyi (United States Patent and Trademark Office, 2018-09-11)
    A resonant power converter is disclosed with a driving circuit generating a switching signal connecting power to a resonant tank circuit, with a voltage monitoring circuit measuring a voltage output and a load current. A ...
  • Semiconductor module arrangement 

    Electrical and Computer Engineering; Center for Power Electronics Systems; Virginia Tech Intellectual Properties, Inc.; DiMarino, Christina; Boroyevich, Dushan; Burgos, Rolando; Johnson, Mark (United States Patent and Trademark Office, 2018-07-24)
    In a switching module structure that includes a low-impedance path to ground, such as a parasitic capacitance of an insulating substrate, a further insulating substrate presenting a parasitic capacitance placed in series ...
  • Hybrid interleaving structure with adaptive phase locked loop for variable frequency controlled switching converter 

    Electrical and Computer Engineering; Center for Power Electronics Systems; Virginia Tech Intellectual Properties, Inc.; Li, Qiang; Liu, Pei-Hsin; Lee, Fred C. (United States Patent and Trademark Office, 2018-07-03)
    In a multi-phase power converter using a phase-locked loop (PLL) arrangement for interleaving of pulse frequency modulated (PFM) pulses of the respective phases, improved transient response, improved stability of high ...
  • Power-cell switching-cycle capacitor voltage control for modular multi-level converters 

    Electrical and Computer Engineering; Center for Power Electronics Systems; Virginia Tech Intellectual Properties, Inc.; Wang, Jun; Boroyevich, Dushan; Burgos, Rolando; Wen, Bo (United States Patent and Trademark Office, 2018-05-08)
    In a modular multi-level power converter, additional switching states are interleaved between main switching states that control output voltage or waveform. The additional switching states provide current from a DC-link ...
  • Power switch drivers with equalizers for paralleled switches 

    Virginia Tech Intellectual Properties, Inc.; Miao, Zichen; Ngo, Khai D.; Zhang, Lujie (United States Patent and Trademark Office, 2018-06-12)
    Capacitors connected between gate terminals of a plurality of parallel-connected power transistors are charged and discharged in each switching cycle to provide a plurality of power transistor control waveforms from a ...

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