Patent ID: 8729844

Claim:
An AC-AC power converter architecture for supplying AC power to an AC motor having a plurality of motor windings and a case connected to a ground terminal, the AC-AC power converter architecture comprising: an asymmetric phase shift autotransformer/rectifier unit (ATRU) that converts an AC input to a DC output, wherein the asymmetric ATRU generates a common-mode AC voltage across the asymmetric ATRU, and wherein the asymmetric ATRU includes an asymmetric autotransformer; a DC-AC converter that converts the DC output to an AC output for supply to the AC motor; and a front-end filter connected to an input of the asymmetric ATRU to filter harmonics associated with the ATRU, wherein the front-end filter includes a common-mode pull-down voltage circuit connected between each phase of the AC input and the ground terminal connected to the case; wherein the asymmetric autotransformer provides six outputs that include a first group of AC outputs phase-shifted to lead the AC input voltages, and a second group of AC outputs phase-shifted to lag the AC input voltages.