Patents by Inventor Daniel Johannesson

Daniel Johannesson 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).

  • Transformer arrangement and method for voltage conversion including a transformer and a converter coupling
    Patent number: 12316235
    Abstract: A transformer arrangement includes a first and a second arrangement side and a transformer with first windings coupled to the first arrangement side and with second windings having a first to a fourth tap. The transformer arrangement comprises a converter coupling the first, second and third tap to the second arrangement side, a first filter circuit coupling the first tap to the third tap and a second filter circuit coupling the third tap to the second tap.
    Type: Grant
    Filed: October 4, 2021
    Date of Patent: May 27, 2025
    Assignee: Hitachi Energy Ltd
    Inventors: Roberto Alves, Panagiotis Bakas, Jan Svensson, Muhammad Nawaz, Seyed Ali Mousavi, Daniel Johannesson, Peter Steimer
  • TRANSFORMER ARRANGEMENT AND METHOD FOR VOLTAGE CONVERSION
    Publication number: 20230327571
    Abstract: A transformer arrangement includes a first and a second arrangement side and a transformer with first windings coupled to the first arrangement side and with second windings having a first to a fourth tap. The transformer arrangement comprises a converter coupling the first, second and third tap to the second arrangement side, a first filter circuit coupling the first tap to the third tap and a second filter circuit coupling the third tap to the second tap.
    Type: Application
    Filed: October 4, 2021
    Publication date: October 12, 2023
    Applicant: Hitachi Energy Switzerland AG
    Inventors: Roberto ALVES, Panagiotis BAKAS, Jan SVENSSON, Muhammad NAWAZ, Seyed Ali MOUSAVI, Daniel JOHANNESSON, Peter STEIMER
  • Switching circuit with snubber components
    Patent number: 11646653
    Abstract: A switching circuit for a voltage source converter includes a string of series-connected switches and a string of capacitors. A first conductor interconnects a first end of the string of series-connected switches with a first end of the string of capacitors at a first switch and a second conductor interconnects a second end of the string of series-connected switches with a second end of the string of capacitors at a second switch. A first string of components is connected between the first end of the string of series-connected switches and the first end of the string of capacitors and includes a snubber component for the first switch. A second string of components is connected between the second end of the string of series-connected switches and the second end of the string of capacitors and includes a snubber component for the second switch.
    Type: Grant
    Filed: October 15, 2019
    Date of Patent: May 9, 2023
    Assignee: Hitachi Energy Switzerland AG
    Inventors: Lennart Harnefors, Daniel Johannesson
  • Switching Circuit with Snubber Components
    Publication number: 20220368246
    Abstract: A switching circuit for a voltage source converter includes a string of series-connected switches and a string of capacitors. A first conductor interconnects a first end of the string of series-connected switches with a first end of the string of capacitors at a first switch and a second conductor interconnects a second end of the string of series-connected switches with a second end of the string of capacitors at a second switch. A first string of components is connected between the first end of the string of series-connected switches and the first end of the string of capacitors and includes a snubber component for the first switch. A second string of components is connected between the second end of the string of series-connected switches and the second end of the string of capacitors and includes a snubber component for the second switch.
    Type: Application
    Filed: October 15, 2019
    Publication date: November 17, 2022
    Inventors: Lennart Harnefors, Daniel Johannesson