Patents by Inventor Per Anders Gustav Ranstad

Per Anders Gustav Ranstad 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).

  • Patent number: 7701732
    Abstract: A high-voltage AC-DC converter is provided that converts alternating current into high-voltage direct current to be provided to a load, e.g. for use as an electrostatic precipitator. The converter includes at least one transformer, wherein the transformer includes at least one primary winding on the AC-side and at least two secondary windings on the DC-side. The converter further includes at least one rectifier rectifying alternating input current, comprising at least one transistor bridge converting the resulting direct current into alternating current, the transformer transforming the resulting alternating current, and comprising at least two high-voltage rectifiers connected to each of the secondary windings, wherein the output voltage of the high-voltage rectifiers is connected in series.
    Type: Grant
    Filed: December 12, 2008
    Date of Patent: April 20, 2010
    Assignee: Alstom Technology Ltd.
    Inventor: Per Anders Gustav Ranstad
  • Patent number: 7649753
    Abstract: An exemplary embodiment of the disclosure pertains to a high-voltage AC-DC converter converting alternating input current into high-voltage direct current to be provided to a load, e.g. for use of powering an electrostatic precipitator. The converter includes at least one unit for the conversion of the alternating (AC) input current into high frequency alternating (AC) current, at least one transformer for adapting the high frequency alternating (AC) current to requirements of the load. A series loaded resonant tank is provided between the at least one unit and the at least one transformer. Modularizing of the topology is achieved in that there are at least two units for the conversion of the alternating (AC) input current into high frequency alternating (AC) current connected to the same transformer.
    Type: Grant
    Filed: June 22, 2007
    Date of Patent: January 19, 2010
    Assignee: Alstom Technology Ltd
    Inventor: Per Anders Gustav Ranstad
  • Publication number: 20090129124
    Abstract: A high-voltage AC-DC converter is provided that converts alternating current into high-voltage direct current to be provided to a load, e.g. for use as an electrostatic precipitator. The converter includes at least one transformer, wherein the transformer includes at least one primary winding on the AC-side and at least two secondary windings on the DC-side. The converter further includes at least one rectifier rectifying alternating input current, comprising at least one transistor bridge converting the resulting direct current into alternating current, the transformer transforming the resulting alternating current, and comprising at least two high-voltage rectifiers connected to each of the secondary windings, wherein the output voltage of the high-voltage rectifiers is connected in series.
    Type: Application
    Filed: December 12, 2008
    Publication date: May 21, 2009
    Applicant: ALSTOM TECHNOLOGY LTD
    Inventor: Per Anders Gustav RANSTAD
  • Publication number: 20070297200
    Abstract: The disclosure pertains to a high-voltage AC-DC converter converting alternating input current (1-3) into high-voltage direct current to be provided to a load (12), e.g. for use of powering an electrostatic precipitator. Said converter comprises a unit (22) for the conversion of the alternating (AC) input current into high frequency alternating (AC) current, at least one transformer (10) for adapting the high frequency alternating (AC) current to requirements of the load (12), wherein between said unit (22) and said transformer (10) there is provided a series loaded resonant tank. Modularizing of the topology is achieved in that there are at least two units (22) for the conversion of the alternating (AC) input current into high frequency alternating (AC) current connected to the same transformer (10).
    Type: Application
    Filed: June 22, 2007
    Publication date: December 27, 2007
    Applicant: ALSTOM Technology Ltd.
    Inventor: Per Anders Gustav Ranstad