Patent ID: 6301130
Filing Date: 2001-10-09
Classification: H02M

Abstract:
A reduced harmonics power drive for a multi-phase AC load comprising:a multi-phase power transformer having at least one primary winding circuit and a plurality of secondary winding circuits, said primary winding circuit electrically connectable to a multi-phase AC power source;a plurality of power cells, each of said power cells comprising:a controllable multi-phase input connected to a respective one of said plurality of secondary winding circuits;a smoothing filter; anda controllable single-phase output to said multi-phase AC load; anda modulation controller connected to each of said plurality of power cells, said modulation controller selectively controlling a series of switching events in said controllable multi-phase input such that one of said input phases of each of said power cells is switched simultaneously with corresponding input phases of all other power cells to reduce harmonics in input lines from said power source.