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    Current sensing in multiple coupled inductors by time constant matching to leakage inductance 

    Lee, Fred C.; Xu, Ming Gang; Dong, Yan (United States Patent and Trademark Office, 2007-06-19)
    Voltage regulators often have coupled output inductors because coupled output inductors provide improvements in cost and efficiency. Coupled inductors are often used in multi-phase voltage regulators. Feedback control of ...
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    Digital power supply control 

    Lee, Fred C.; Li, Jian H.; Xu, Ming Gang; Qiu, Yang (United States Patent and Trademark Office, 2010-04-27)
    A switched voltage regulator provides improved regulation at a lower clock rate/sampling frequency (e.g. several orders of magnitude lower than would be required for comparable regulation) while using a low resolution ...
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    Two-stage voltage regulators with adjustable intermediate bus voltage, adjustable switching frequency, and adjustable number of active phases 

    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 ...
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    Multiphase voltage regulator having coupled inductors with reduced winding resistance 

    Lee, Fred C.; Xu, Ming Gang; Zhou, Jinghai; Dong, Yan (United States Patent and Trademark Office, 2007-04-03)
    A multiple phase buck converter or boost converter, or buck-boost converter has an inductor in each phase. A magnetic core with a unique woven topology provides inverse coupling between the inductors. The inductors can ...
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    Hybrid filter for high slew rate output current application 

    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 ...
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    Multiphase voltage regulator having coupled inductors with reduced winding resistance 

    Lee, Fred C.; Xu, Ming Gang; Dong, Yan (United States Patent and Trademark Office, 2010-01-19)
    A multiple phase buck converter or boost converter, or buck-boost converter has an inductor in each phase. The inductors are inversely coupled. In a first embodiment, the converter includes a toroidal magnetic core with ...
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    Hybrid filter for high slew rate output current application 

    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 ...
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    Adaptive bus voltage positioning for two-stage voltage regulators 

    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 V<sub>bus </sub>regulator stage in a two-stage voltage regulator provides optimal V<sub>bus </sub>voltage placement for a wide range of current loads ...
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    Non-isolated bus converters with voltage divider topology 

    Lee, Fred C.; Xu, Ming Gang; Sun, Ju-Lu (United States Patent and Trademark Office, 2010-06-29)
    A voltage converter having four switches Q1, Q2, Q3, Q4, connected in series and operated in pairs in a complementary fashion. An input voltage is provided across the four switches. A middle capacitor is connected in ...
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    Method and apparatus for reduction of energy loss due to body diode conduction in synchronous rectifiers 

    Lee, Fred C.; Xu, Ming Gang (United States Patent and Trademark Office, 2004-08-24)
    A method and apparatus for preventing current flow through the integral body diode of an electronic switch (e.g. MOSFET) in the secondary circuit of a synchronous rectifier. In a conventional synchronous rectifier, body ...
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    Patent Typeutility (26)InventorLee, Fred C. (26)
    Xu, Ming Gang (26)
    Ren, Yuancheng (7)Zhou, Jinghai (5)Dong, Yan (4)... View MoreAssigneeVirginia Tech Intellectual Properties, Inc. (26)Publication Date2014 (1)2012 (1)2011 (1)2010 (7)2009 (4)2007 (6)2006 (3)2005 (1)2004 (2)Has File(s)Yes (26)

    If you believe that any material in VTechWorks should be removed, please see our policy and procedure for Requesting that Material be Amended or Removed. All takedown requests will be promptly acknowledged and investigated.

    Virginia Tech | University Libraries | Contact Us