Patents by Inventor Ingemar Blidberg

Ingemar Blidberg 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 and a method for controlling a converter
    Patent number: 7206211
    Abstract: In a method for control of a converter for conversion of dc voltage into ac voltage or dc voltage and vice versa, in which an output of the converter may alternatively be connected to a positive pole, a negative pole or a center of a dc voltage side of the converter in the form of different so-called main states, there is carried out, when changing between main states via a so-called minor commutation loop, an extra sequence in the form of a delayed turn-on of semiconductor elements in one unit of the converter relative to semiconductor elements in another unit in a pair of units of the converter.
    Type: Grant
    Filed: October 7, 2003
    Date of Patent: April 17, 2007
    Assignee: ABB AB
    Inventors: Ingemar Blidberg, Kjell Svensson, Roland Siljeström
  • Converter and a method for controlling a converter
    Publication number: 20060056209
    Abstract: In a method for control of a converter for conversion of dc voltage into ac voltage or dc voltage and vice versa, in which an output of the converter may alternatively be connected to a positive pole, a negative pole or a center of a dc voltage side of the converter in the form of different so-called main states, there is carried out, when changing between main states via a so-called minor commutation loop, an extra sequence in the form of a delayed turn-on of semiconductor elements in one unit of the converter relative to semiconductor elements in another unit in a pair of units of the converter.
    Type: Application
    Filed: October 7, 2003
    Publication date: March 16, 2006
    Inventors: Ingemar Blidberg, Kjell Svensson, Roland Siljestrom
  • VSC-converter
    Patent number: 6259616
    Abstract: In a VSC-converter for converting direct voltage to alternating voltage and conversely at least one phase leg (2) is arranged according to a NPC-connection. At least two of the four current valves (3-6) and the clamping rectifying members (10, 11) thereof are arranged close to each other and so that commutation currents generated on commutation of the converter therein will flow in substantially opposite directions.
    Type: Grant
    Filed: May 16, 2000
    Date of Patent: July 10, 2001
    Assignee: ABB AB
    Inventors: Olle Ekwall, Ingemar Blidberg, Björn Jacobson, Bo Bijlenga, Henrik Spjuth
  • Voltage converter having a commutation circuit with reduced inductance
    Patent number: 5870300
    Abstract: A VSC converter has each current valve of a phase leg formed by a plurality of units of semiconductor elements and rectifying members, located on top of each other forming at least one stack. The phase leg is constructed according to the flat cable principle with the phase leg formed by such stacks arranged side by side in pairs at small distances (d) running back and forth. A cooling plate of electrically conducting material is arranged between each unit in the stacks.
    Type: Grant
    Filed: October 2, 1997
    Date of Patent: February 9, 1999
    Assignee: Asea Brown Boveri AB
    Inventors: Ingemar Blidberg, Olle Ekwall