Patents by Inventor Dan Liljegren

Dan Liljegren 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).

  • Switch protection i auxiliary resonant circuit
    Patent number: 9537394
    Abstract: A resonant power converter comprising electrical safety components comprising a combination of a diodes and a zener diodes coupled between DC conductors and an auxiliary switching circuit, the diodes being adapted to hinder the current from flowing from the auxiliary switching circuit to the negative DC conductor, and the zener diodes being adapted to allow current to flow from the negative DC conductor to the auxiliary switching circuit when the potential difference between the negative DC conductor and the phase conductor is above a threshold voltage. The Zener diodes being selected such that the threshold voltage of the Zener diodes is below the maximum blocking voltage of the transistors.
    Type: Grant
    Filed: July 3, 2013
    Date of Patent: January 3, 2017
    Assignee: COMSYS AB
    Inventors: Dan Liljegren, Oscar Haraldsson
  • SWITCH PROTECTION I AUXILIARY RESONANT CIRCUIT
    Publication number: 20150207408
    Abstract: A resonant power converter comprising electrical safety components comprising a combination of a diodes and a zener diodes coupled between DC conductors and an auxiliary switching circuit, the diodes being adapted to hinder the current from flowing from the auxiliary switching circuit to the negative DC conductor, and the zener diodes being adapted to allow current to flow from the negative DC conductor to the auxiliary switching circuit when the potential difference between the negative DC conductor and the phase conductor is above a threshold voltage. The Zener diodes being selected such that the threshold voltage of the Zener diodes is below the maximum blocking voltage of the transistors.
    Type: Application
    Filed: July 3, 2013
    Publication date: July 23, 2015
    Inventors: Dan Liljegren, Oscar Haraldsson