Now showing items 1-4 of 4

    • Adaptive bus voltage positioning for two-stage voltage regulators 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Xu, Ming Gang; Wei, Jia (United States Patent and Trademark Office, 2007-01-09)
      Alteration of voltage input to a voltage regulator output stage from a Vbus regulator stage in a two-stage voltage regulator provides optimal Vbus voltage placement for a wide range of current loads ...
    • Adaptive on-time control for power factor correction stage light load efficiency 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Wang, Chung-Hsing Hsuan; Xu, Ming Gang; Li, Qian (United States Patent and Trademark Office, 2014-08-12)
      Light load efficiency of a power factor correction circuit is improved by adaptive on-time control and providing for selection between a continuous conduction mode and a discontinuous conduction mode wherein the discontinuous ...
    • Multi-step simplified optimal trajectory control (SOTC) based on only Vo and I load 

      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 ...
    • Two-stage voltage regulators with adjustable intermediate bus voltage, adjustable switching frequency, and adjustable number of active phases 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Xu, Ming Gang; Wei, Jia; Ren, Yuancheng; Zhou, Jinghai (United States Patent and Trademark Office, 2006-07-04)
      A two-stage power converter that dynamically adjusts to output current requirements includes a first stage regulator that provides power to a second stage regulator. The first stage can be a buck converter, and the second ...