The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 13, 2007
Filed:
Aug. 26, 2004
Julius Luukko, Lappeenranta, FI;
Hannu Saren, Lappeenranta, FI;
Julius Luukko, Lappeenranta, FI;
Hannu Saren, Lappeenranta, FI;
Vacon Oyj, Vaasa, FI;
Abstract
A space-vector pulse-width modulation method for a frequency converter provided with a voltage intermediate circuit, said frequency converter comprising a mains bridge () to be connected to an alternating current source (U, U, U), a direct-voltage intermediate circuit and a controlled load bridge () for supplying a variable-frequency alternating voltage (U, U, U) to a load (), and in which method the modulator performing the modulation is given a reference. The load bridge modulator is given a reference consisting of the references for the flux linkage changes produced by the voltage vectors, the flux linkage change is calculated on the basis of measured intermediate-circuit voltage, and the currently active voltage vector is kept turned on until the reference value is reached.
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