Patents by Inventor Ari Hedemäki

Ari Hedemäki 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).

  • Method of changing an operation mode of a frequency converter based on temperature conditions, and a frequency converter having a changeable mode of operation based on temperature conditions
    Patent number: 8238131
    Abstract: A method in connection with a frequency converter and a frequency converter, the frequency converter being arranged for periodic recurrent use. The method comprises steps for generating and storing in a memory an average heating of a power semiconductor of the frequency converter, caused by one loading period, determining a temperature limit from the generated heating and the highest allowed temperature of the power semiconductor, determining the temperature of the power semiconductor in the frequency converter, and changing the operation mode of the frequency converter when the temperature of the power semiconductor exceeds the temperature limit when transferring to a loading period.
    Type: Grant
    Filed: December 13, 2006
    Date of Patent: August 7, 2012
    Assignee: ABB Oy
    Inventors: Ari Hedemäki, Vesa Tiihonen
  • Method in frequency converter, and frequency converter
    Publication number: 20110141787
    Abstract: A method in connection with a frequency converter and a frequency converter, the frequency converter being arranged for periodic recurrent use. The method comprises steps for generating and storing in a memory an average heating of a power semiconductor of the frequency converter, caused by one loading period, determining a temperature limit from the generated heating and the highest allowed temperature of the power semiconductor, determining the temperature of the power semiconductor in the frequency converter, and changing the operation mode of the frequency converter when the temperature of the power semiconductor exceeds the temperature limit when transferring to a loading period.
    Type: Application
    Filed: December 13, 2006
    Publication date: June 16, 2011
    Inventors: Ari Hedemäki, Vesa Tiihonen