Patent ID: 7564703
Filing Date: 2009-07-21
Classification: H02M

Abstract:
1. An apparatus for converting DC voltage across positive and negative DC buses to three phase AC voltages on first, second and third AC output lines, the apparatus comprising: a first DC link choke linked to the positive and negative DC buses and having common mode impedance, the first DC link choke including positive and negative first choke outputs; a first three phase inverter linked to the positive and negative first choke outputs and including first, second and third first inverter outputs that are linked directly to the first, second and third AC output lines at first, second and third common coupling points, respectively, the first inverter including a first subset of switches; a second DC link choke linked to the positive and negative DC buses and having common mode impedance, the second DC link choke including positive and negative second choke outputs; a second three phase inverter linked to the positive and negative second choke outputs and including first, second and third second inverter outputs that are linked directly to the first, second and third AC output lines at the first, second and third common coupling points, respectively, the second inverter including a second subset of switches; and a controller for synchronously controlling the first and second inverter switch subsets so that switching of first and second inverter switch subsets is substantially synchronized among the three phases.