Patents Examined by Vinh Nugyen
  • Procedure and apparatus for the measurement of the currents in a frequency converter
    Patent number: 5163172
    Abstract: A procedure and apparatus for the measurement of the currents in a frequency converter, provides that the phase currents of the frequency converter are measured by storing, in memory, signals corresponding to the current of the d.c. circuit of the converter and by producing a current value corresponding to the phase current from the previous and the momentary signals.
    Type: Grant
    Filed: November 6, 1989
    Date of Patent: November 10, 1992
    Assignee: Kone Elevator GmbH
    Inventor: Harri Hakala