Patents by Inventor George Zhongyuan Cheng

George Zhongyuan Cheng has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • IMPROVED SELF POWERED SUPPLY FOR POWER CONVERTER SWITCH DRIVER
    Publication number: 20100265740
    Abstract: Self-powered supplies with on-board diagnostics are presented for powering a power converter switch driver with power obtained from an associated snubber circuit, including a first converter stage with a full bridge rectifier with a crowbar circuit creating a first DC bus and a second stage with an isolated DC to DC converter, and on-board diagnostics to indicate snubber failures and abnormal conditions of the self-powered supply.
    Type: Application
    Filed: April 15, 2009
    Publication date: October 21, 2010
    Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.
    Inventors: Navid R. Zargari, George Zhongyuan Cheng, Angelo R. Bortolus
  • POWER CONVERSION SYSTEM AND METHOD FOR ACTIVE DAMPING OF COMMON MODE RESONANCE
    Publication number: 20100080028
    Abstract: Power conversion systems and methods are presented for damping common mode resonance, in which inverter or rectifier switching control signals are selectively modified according to a damping resistance current value computed using a predetermined virtual damping resistance value in parallel with an output or input capacitor and a measured output or input voltage value to mitigate or reduce common mode resonance in the converter.
    Type: Application
    Filed: September 29, 2008
    Publication date: April 1, 2010
    Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.
    Inventors: George Zhongyuan Cheng, Navid Zargari, Yuan Xiao, Manish Pande