Patents by Inventor Ola Qvarnström

Ola Qvarnström 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).

  • Multiphase transformer rectifier unit
    Patent number: 9236811
    Abstract: A multiphase transformer rectifier unit for converting a three-phase alternating current supplied from a power distribution system to direct current supplied to at least one load. The multiphase transformer rectifier unit includes a magnetic core having a primary winding set and secondary winding set, and a rectifier circuit. The secondary winding set is arranged to generate N substantially equally distributed output phases, wherein N is an odd number multiple of 3, and N>3, and the primary winding set (17) is arranged to provide a positive or negative phase shift equal substantially to 360 ( 8 × N ) degrees of said output phases. Also an arrangement of two inventive multiphase transformer rectifier units for reducing current distortion in the power distribution system.
    Type: Grant
    Filed: July 15, 2010
    Date of Patent: January 12, 2016
    Assignee: SAAB AB
    Inventors: Lennart Kruse, Johan Björk Svensson, Ola Qvarnström, Claes-Göran Sköld
  • MULTIPHASE TRANSFORMER RECTIFIER UNIT
    Publication number: 20130176756
    Abstract: A multiphase transformer rectifier unit for converting a three-phase alternating current supplied from a power distribution system to direct current supplied to at least one load. The multiphase transformer rectifier unit includes a magnetic core having a primary winding set and secondary winding set, and a rectifier circuit. The secondary winding set is arranged to generate N substantially equally distributed output phases, wherein N is an odd number multiple of 3, and N>3, and the primary winding set (17) is arranged to provide a positive or negative phase shift equal substantially to 360 ( 8 × N ) degrees of said output phases. Also an arrangement of two inventive multiphase transformer rectifier units for reducing current distortion in the power distribution system.
    Type: Application
    Filed: July 15, 2010
    Publication date: July 11, 2013
    Applicant: SAAB AB
    Inventors: Lennart Kruse, Johan Björk Svensson, Ola Qvarnström, Claes-Göran Sköld