Patents by Inventor Mark Gries

Mark Gries 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).

  • System and method for reducing reactive current on a common DC bus with multiple inverters
    Patent number: 9515484
    Abstract: A system configured to reduce the amplitude of reactive current present on a DC bus shared by multiple inverters is disclosed. The start of the switching period for the modulation routines of each inverter is synchronized, and a carrier phase angle is determined for a carrier signal within each of the inverters. The modulation routine of each inverter generates a reactive current on the shared DC bus. By controlling the carrier phase angle for each inverter, the reactive current of a first inverter may be generated at a phase angle that is offset from the phase angle of the reactive current generated by a second inverter. As a result, the reactive current from the first inverter cancels at least a portion of the reactive current from the second inverter, reducing the total reactive current present on the DC bus.
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: December 6, 2016
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Rongjun Huang, Craig Winterhalter, Mark Gries, Ye Li
  • System and Method for Reducing Reactive Current on a Common DC Bus with Multiple Inverters
    Publication number: 20140361613
    Abstract: A system configured to reduce the amplitude of reactive current present on a DC bus shared by multiple inverters is disclosed. The start of the switching period for the modulation routines of each inverter is synchronized, and a carrier phase angle is determined for a carrier signal within each of the inverters. The modulation routine of each inverter generates a reactive current on the shared DC bus. By controlling the carrier phase angle for each inverter, the reactive current of a first inverter may be generated at a phase angle that is offset from the phase angle of the reactive current generated by a second inverter. As a result, the reactive current from the first inverter cancels at least a portion of the reactive current from the second inverter, reducing the total reactive current present on the DC bus.
    Type: Application
    Filed: June 5, 2013
    Publication date: December 11, 2014
    Inventors: Rongjun Huang, Craig Winterhalter, Mark Gries, Ye Li