Patents by Inventor James J. Valasek

James J. Valasek 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).

  • DC bus precharge system
    Patent number: 11233475
    Abstract: A precharge system for precharging a DC bus circuit includes a first input, first and second circuit branches, and a controller, where the first circuit branch includes a first contactor between the first input and an AC to DC converter, the second circuit branch has: a disconnect switch coupled to the first input; a variable frequency drive (VFD) with an AC input coupled to the disconnect switch; an inductor coupled to an AC output of the VFD; and a second contactor coupled to the inductor. The precharge VFD provides precise control of the precharge operation such as charging time, current limiting, short-circuit and ground fault protection, monitoring DC Bus capacitance and verifies the health of the shared DC bus circuit through startup diagnostic.
    Type: Grant
    Filed: May 14, 2020
    Date of Patent: January 25, 2022
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: James J Valasek, Nickolay Guskov, Gary Skibinski
  • DC BUS PRECHARGE SYSTEM
    Publication number: 20210359632
    Abstract: A precharge system for precharging a DC bus circuit includes a first input, first and second circuit branches, and a controller, where the first circuit branch includes a first contactor between the first input and an AC to DC converter, the second circuit branch has: a disconnect switch coupled to the first input; a variable frequency drive (VFD) with an AC input coupled to the disconnect switch; an inductor coupled to an AC output of the VFD; and a second contactor coupled to the inductor. The precharge VFD provides precise control of the precharge operation such as charging time, current limiting, short-circuit and ground fault protection, monitoring DC Bus capacitance and verifies the health of the shared DC bus circuit through startup diagnostic.
    Type: Application
    Filed: May 14, 2020
    Publication date: November 18, 2021
    Applicant: Rockwell Automation Technologies, Inc.
    Inventors: James J. Valasek, Nickolay Guskov, Gary Skibinski