Now showing items 1-8 of 8

    • Buck converter with high efficiency gate driver providing extremely short dead time 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Ren, Yuancheng (United States Patent and Trademark Office, 2007-02-27)
      A buck converter has a driver circuit with a drive transformer that provides complementary voltages to the buck converter switches. The drive transformer may have two secondary windings, with one winding for each converter ...
    • Hybrid filter for high slew rate output current application 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Xu, Ming Gang; Ren, Yuancheng; Schmit, Andrew P. (United States Patent and Trademark Office, 2009-07-14)
      An active linear regulator circuit in parallel with a filter capacitor of a switching voltage regulator injects current to a load only when the switching regulator and capacitor cannot supply adequate current to follow ...
    • Hybrid filter for high slew rate output current application 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Xu, Ming Gang; Ren, Yuancheng; Schmit, Andrew P. (United States Patent and Trademark Office, 2009-09-01)
      An active linear regulator circuit in parallel with a filter capacitor of a switching voltage regulator injects current to a load only when the switching regulator and capacitor cannot supply adequate current to follow ...
    • Power converters having capacitor resonant with transformer leakage inductance 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Xu, Ming Gang; Ren, Yuancheng (United States Patent and Trademark Office, 2007-03-27)
      Power converters having reduced body diode conduction loss, reduced reverse recovery loss and lower switching noise, among other benefits, have a resonant capacitor Cr connected across an unfiltered output. The resonant ...
    • Power converters having output capacitor resonant with autotransformer leakage inductance 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Xu, Ming Gang; Ren, Yuancheng; Sun, Ju-Lu (United States Patent and Trademark Office, 2007-08-07)
      Power converters having reduced body diode conduction loss, reduced reverse recovery loss and lower switching noise, among other benefits, have a resonant capacitor Cr connected across an unfiltered output. The resonant ...
    • Self-driven circuit for synchronous rectifier DC/DC converter 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Xu, Ming Gang; Ren, Yuancheng (United States Patent and Trademark Office, 2006-03-21)
      A power converter having a primary circuit (e.g. full bridge) and a secondary circuit (e.g. current doubler) has switches in the secondary circuit that are controlled by a drive circuit. The drive circuit is connected to ...
    • Self-driven circuit for synchronous rectifier DC/DC converter 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Xu, Ming Gang; Ren, Yuancheng (United States Patent and Trademark Office, 2004-11-16)
      A power converter having a primary circuit (e.g. full bridge) and a secondary circuit (e.g. current doubler) has switches in the secondary circuit that are controlled by a drive circuit. The drive circuit is connected to ...
    • 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 ...