Now showing items 1-12 of 12

    • Half-bridge zero-voltage switched multi-resonant converters 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Tabisz, Wojciech A.; Jovanovic, Milan M. (United States Patent and Trademark Office, 1989-08-22)
      A half-bridge zero-voltage-switched multi-resonant converter. The converter basically comprises a device for converting an input voltage signal to a DC output signal to be imposed across a load. The device includes input ...
    • Multi-element resonant converters 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Xu, Ming Gang; Liu, Ya; Fu, Dianbo (United States Patent and Trademark Office, 2010-06-22)
      A resonant switched power converter having switching frequency controlled in response to an output voltage thereof achieves over-current protection such as at start-up or under short circuit conditions using a resonant ...
    • Multi-loop control for quasi-resonant converters 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Ridley, Raymond B. (United States Patent and Trademark Office, 1989-09-12)
      A multi-loop controller for controlling a quasi-resonant converter having a power switch, a filter inductor and an output voltage. The controller includes a sensor circuit for sensing the output voltage of the converter. ...
    • 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 ...
    • Phase compensation driving scheme for synchronous rectifiers 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Fu, Dianbo (United States Patent and Trademark Office, 2009-10-13)
      Phase compensation of a voltage appearing on physical terminals of a synchronous rectifier switching element such as a MOSFET is used to substantially eliminate effects of package inductance of the synchronous rectifier ...
    • 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 ...
    • Pulse width modulated resonant power conversion 

      Virginia Tech Intellectual Properties, Inc.; Cao, Xiao Hong; The Ngo, Khai Doan; Wang, Yin (United States Patent and Trademark Office, 2014-08-19)
      A power converter including a resonant circuit is controlled by pulse width modulation (PWM) of a switching circuit to control current in the resonant circuit near the frequency of the resonant circuit (a null-immittance ...
    • Quasi-resonant DC-DC converters with reduced body diode loss 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Xu, Ming Gang (United States Patent and Trademark Office, 2006-01-24)
      Buck converters having a resonant inductor Lr, resonant capacitor Cr, and synchronous switch Q3 that together provide reduced switching loss and soft switching. In operation, the resonant inductor Lr is charged during a ...
    • Resonant converters with secondary-side resonance 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Liu, Kwang-Hwa (United States Patent and Trademark Office, 1988-11-15)
      A family of quasi-resonant converters is disclosed as comprising a voltage source, a transformer having primary and secondary windings, and a switch for periodically coupling the voltage source to the primary winding, ...
    • Universal system structure for low power adapters 

      Virginia Tech Intellectual Properties, Inc.; Li, Qiang; Lee, Fred C.; Huang, Xiucheng (United States Patent and Trademark Office, 2017-12-19)
      A two-stage power converter architecture including an isolation transformer and rectification of the isolation transformer output by an LLC resonant circuit and methodology for operating the same feeds an output voltage ...
    • Zero-voltage-switched multi-resonant converters including the buck and forward type 

      Virginia Tech Intellectual Properties, Inc.; 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 ...