Now showing items 1-4 of 4

    • 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 ...
    • Digital hybrid Vcontrol for buck converters 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Mattavelli, Paolo; Cheng, Kuang-Yao; Yu, Feng Hao (United States Patent and Trademark Office, 2013-11-05)
      Stabilization of a switching voltage regulator employing Vcontrol against ripple oscillation instability when the equivalent series resistance (ESR) of an output capacitor is small is provided by providing both an external ...
    • Input current sensing AVP method for future VRM 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Xu, Ming Gang; Zhou, Jinghai (United States Patent and Trademark Office, 2009-10-20)
      A voltage converter provides a desired voltage droop with load while avoiding output current sensing and active control/feedback circuits and avoiding excessive power dissipation from passive components by placing a sensing ...
    • Method and circuits for reducing dead time and reverse recovery loss in buck regulators 

      Virginia Tech Intellectual Properties, Inc.; Huang, Alex Q.; Bai, Yuming; Sun, Nick (United States Patent and Trademark Office, 2004-05-18)
      A buck regulator having a voltage sensor for sensing a voltage reversal caused by freewheeling current from an output inductor in the regulator. Upon sensing a reversed voltage, the voltage sensor triggers a gate controller ...