Patents by Inventor Oliver Keiser

Oliver Keiser 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).

  • CONVERTER CIRCUIT AND METHOD FOR OPERATING SUCH A CONVERTER CIRCUIT
    Publication number: 20090085548
    Abstract: A converter circuit is specified in which, in order to avoid losses to the greatest possible extent, a first inductance is connected in series into the connection of a DC voltage source of the converter circuit to a first switch of the converter circuit, and in which, moreover, a second inductance is connected in series into the connection of a second switch of a switching group of the converter circuit to the junction point between a second capacitive energy store and a second unidirectional non-drivable power semiconductor switch of the switching group. Two further alternative converter circuits and also a method for operating the converter circuit are furthermore specified.
    Type: Application
    Filed: September 15, 2008
    Publication date: April 2, 2009
    Applicant: ABB Schweiz AG
    Inventors: Yongsug Suh, Peter Steimer, Oliver Keiser