Patents by Inventor Keith A. Kumar

Keith A. Kumar 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).

  • HIGH VOLTAGE BATTERY CHARGER AND METHODS OF OPERATION
    Publication number: 20170232855
    Abstract: A high voltage battery charger converts an AC input into a DC output. A controller is configured to calculate an efficiency of the high voltage battery charger, compare the calculated efficiency to a first threshold value, and signal a fault in response to the calculated efficiency being less than the first efficiency threshold value. Despite the fault, the battery charger keeps charging if the calculated efficiency and/or an average efficiency is not less than a second efficiency threshold value.
    Type: Application
    Filed: February 11, 2016
    Publication date: August 17, 2017
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Joshua A. Vallender, Robert M. Rotay, Keith A. Kumar, Michael A. Assenmacher