Patents by Inventor Frank A. DeWinter

Frank A. DeWinter 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).

  • Harmonic eliminating PWM converter
    Patent number: 5835364
    Abstract: A PWM based converter including a Y-.DELTA., Y--Y transformer (or a .DELTA.--.DELTA., .DELTA.-Y transformer) wherein the Y-.DELTA. portion of the transformer phase shifts input voltage by 30.degree. with respect to the Y--Y portion of the transformer and thereby eliminates many low order supply line harmonics. The rectifier also includes two series connected PWM switching rectifiers, one rectifier receiving input voltages from the Y--Y portion of the transformer and the other rectifier receiving input voltages from the Y-.DELTA. portion of the transformer, and a controller for controlling the first and second rectifiers so as to eliminate low order harmonics on the supply lines that are not eliminated by the transformer. A capacitive bank is required between each rectifier and the transformer.
    Type: Grant
    Filed: June 12, 1997
    Date of Patent: November 10, 1998
    Assignee: Allen Bradley Company, LLC
    Inventors: Frank A. DeWinter, Navid R. Zargari, Bin Wu, Yuan Xiao