Patents by Inventor Lee Joshua Rashkin

Lee Joshua Rashkin 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).

  • Excitation control of dual-wound machines for coupling mitigation
    Patent number: 11527942
    Abstract: A dual-wound machine comprises a dual-wound generator supplying power to two separate powered zones. The generator comprises a wound rotor with a field winding and a stator with two sets of phase windings and a field control loop that controls the excitation voltage applied to the field winding and therefore the magnetic field produced by the rotor, in order to maintain a constant field flux in the generator and mitigate dynamic coupling between the two sets of phase windings when supplying power to unbalanced loads.
    Type: Grant
    Filed: March 26, 2020
    Date of Patent: December 13, 2022
    Assignees: National Technology & Engineering Solutions of Sandia, LLC, United States of America as represented by the Secretary of the Navy
    Inventors: Lee Joshua Rashkin, Jason C. Neely, Timothy J. McCoy, Norbert H. Doerry
  • Passive high-power-density grid interface device
    Patent number: 10886841
    Abstract: A hybrid switched capacitor power converter for high-power applications is provided. The converter has a transistor-switched input-stage boost converter followed by a capacitor-and-diode ladder circuit. The converter is adapted to produce an output voltage of at least 5 kV at a power level of at least 0.5 kW. The ladder circuit includes one or more multi-stage rails.
    Type: Grant
    Filed: April 15, 2019
    Date of Patent: January 5, 2021
    Assignee: National Technology & Engineering Solutions of Sandia, LLC
    Inventors: Robert W. Brocato, Jason C. Neely, Lee Joshua Rashkin, Jarod James Delhotal, Jack David Flicker, Robert Kaplar, Joshua Stewart, James Richards
  • Excitation control of dual-wound machines for coupling mitigation
    Publication number: 20200313518
    Abstract: A dual-wound machine comprises a dual-wound generator supplying power to two separate powered zones. The generator comprises a wound rotor with a field winding and a stator with two sets of phase windings and a field control loop that controls the excitation voltage applied to the field winding and therefore the magnetic field produced by the rotor, in order to maintain a constant field flux in the generator and mitigate dynamic coupling between the two sets of phase windings when supplying power to unbalanced loads.
    Type: Application
    Filed: March 26, 2020
    Publication date: October 1, 2020
    Inventors: Lee Joshua Rashkin, Jason C. Neely, Timothy J. McCoy, Norbert H. Doerry
  • Subharmonic power line carrier based island detection systems and methods
    Patent number: 10326279
    Abstract: Systems and methods for identifying an island condition in a power distribution system and disconnecting distributed generators in the case of islanding. The systems and methods are used to enable reliable detection of island formation with high false-trip immunity, for any combination of distributed energy resources, and for distributed energy resources using grid support functions.
    Type: Grant
    Filed: July 18, 2016
    Date of Patent: June 18, 2019
    Assignees: Northern Plains Power Technologies, Sandia Corporation
    Inventors: Michael Ropp, Scott Perlenfein, Jason C. Neely, Sigifredo Gonzalez, Lee Joshua Rashkin
  • SUBHARMONIC POWER LINE CARRIER BASED ISLAND DETECTION SYSTEMS AND METHODS
    Publication number: 20170077703
    Abstract: Systems and methods for identifying an island condition in a power distribution system and disconnecting distributed generators in the case of islanding. The systems and methods are used to enable reliable detection of island formation with high false-trip immunity, for any combination of distributed energy resources, and for distributed energy resources using grid support functions.
    Type: Application
    Filed: July 18, 2016
    Publication date: March 16, 2017
    Inventors: Michael Ropp, Scott Perlenfein, Jason C. Neely, Sigifredo Gonzalez, Lee Joshua Rashkin