Patents by Inventor Lewis M. Roufberg

Lewis M. Roufberg 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).

  • Device and method for continuously equalizing the charge state of lithium ion battery cells
    Patent number: 8933666
    Abstract: A method of equalizing charge states of individual cells in a battery includes measuring a previous cell voltage for each cell, measuring a previous shunt current for each cell, calculating, based on the previous cell voltage and the previous shunt current, an adjusted cell voltage for each cell, determining a lowest adjusted cell voltage from among the calculated adjusted cell voltages, and calculating a new shunt current for each cell.
    Type: Grant
    Filed: July 12, 2011
    Date of Patent: January 13, 2015
    Assignee: The Johns Hopkins University
    Inventors: Paul D. Schwartz, Mark N. Martin, Lewis M. Roufberg
  • Device and Control Algorithm for Continuously Equalizing the Charge State of Lithium Ion Battery Cells
    Publication number: 20120007559
    Abstract: A method of equalizing charge states of individual cells in a battery includes measuring a previous cell voltage for each cell, measuring a previous shunt current for each cell, calculating, based on the previous cell voltage and the previous shunt current, an adjusted cell voltage for each cell, determining a lowest adjusted cell voltage from among the calculated adjusted cell voltages, and calculating a new shunt current for each cell.
    Type: Application
    Filed: July 12, 2011
    Publication date: January 12, 2012
    Inventors: Paul D. Schwartz, Mark N. Martin, Lewis M. Roufberg