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    Zero-voltage-transition (ZVT) 3-phase PWM voltage link converters 

    Lee, Fred C.; Mao, Hengchun (United States Patent and Trademark Office, 1996-11-12)
    An improved zero voltage transition (ZVT) pulse width modulation (PWM) link converter is provided which introduces a space vector modulation scheme and an auxiliary circuit which includes a commutation power supply or ...
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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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    Step-down buck converter with full bridge circuit 

    Lee, Fred C.; Wei, Jia (United States Patent and Trademark Office, 2004-06-29)
    A power converter with high efficiency, low component count, and high step down conversion capability. The converter has a full bridge circuit connected to a pair of buck output circuits. The full bridge circuit and buck ...
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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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    Multi-channel two-stage controllable constant current source and illumination source 

    Lee, Fred C.; Feng, Weiyi (United States Patent and Trademark Office, 2015-04-07)
    A multi-channel constant current source particularly suitable for driving an array of light-emitting diodes as an illumination apparatus provides a power source stage voltage regulator for providing a variable voltage using ...
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    EMI filter and frequency filters having capacitor with inductance cancellation loop 

    Lee, Fred C.; Odendaal, Willem G.; Wang, Shuo (United States Patent and Trademark Office, 2007-02-20)
    An electromagnetic interference (EMI) filter or frequency filters (e.g. bandpass or band reject filters) in which a capacitor has an inductance cancellation loop. Inductive coupling between capacitors can allow undesired ...
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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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    High input voltage, high efficiency, fast transient voltage regulator module (VRM) 

    Lee, Fred C.; Zhou, Xunwei (United States Patent and Trademark Office, 2003-07-08)
    A high input-voltage push-pull forward voltage regulator module (VRM) has high efficiency and fast transient response. The VRM has a primary side wherein two switches and two primary transformer windings are alternately ...
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    Zero-voltage-switched multi-resonant converters including the buck and forward type 

    Lee, Fred C.; Tabisz, Wojciech A. (United States Patent and Trademark Office, 1989-08-15)
    A multi-resonant-switching network that operates under switching conditions that are favorable to both the active switch and the diode that constitute the switch. In a zero-current multi-resonant switch, the resonant circuit ...
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    Patent Typeutility (72)Inventor
    Lee, Fred C. (72)
    Xu, Ming Gang (26)Li, Qiang (8)Ren, Yuancheng (8)Wang, Shuo (7)... View MoreAssigneeVirginia Tech Intellectual Properties, Inc. (72)Center for Innovative Technology (3)Matsushita Electric Works, Ltd. (3)Virginia Polytechnic Institute and State University (3)Delta Electronics, Inc. (1)... View MorePublication Date2010 - 2020 (26)2000 - 2009 (35)1990 - 1999 (6)1988 - 1989 (5)Has File(s)Yes (72)

    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