Patent ID: 7804264

Claim:
A device comprising: a main circuit including six bridge-connected switching elements enabled to turn on and off in predetermined patterns so that a supplied from an external source DC voltage is converted into an approximately instant state of a three-phase AC voltage as defined by an electrical angle, and a control circuit connected to the main circuit for turning on and off the switching elements in order to provide switching patterns 10 Z, Z 01 , 0 Z 1 , 01 Z, Z 10 , 1 Z 0 corresponding to six non-zero vectors, and 0 ZZ, Z 1 Z, ZZ 0 , ZZZ, 1 ZZ, Z 0 Z, ZZ 1 corresponding to seven zero vectors; the control circuit provides an emulation sequence comprising at least two of the switching patterns, each provided for a time interval, where the switching patterns in the sequence and their time intervals are determined by the electrical angle.