An AC-to-DC converter (100, 200, 300, 400) comprising: a main rectifier (130, 230, 330, 430); a first auxiliary rectifier (140, 240, 340, 440); a second auxiliary rectifier (150, 250, 350, 450); and a transformer assembly including (120, 220, 320, 420): a set of primary windings (122, 222, 322, 422) arranged in a first multiphase configuration and connected to the main rectifier; a first set of secondary windings (124, 224, 324, 424) arranged in a second multiphase relationship and connected to the first auxiliary rectifier; and a second set of secondary windings (126, 226, 326, 426) arranged in a third multiphase configuration and connected to the second auxiliary rectifier, wherein the second multiphase configuration of the first set of secondary windings and the third multiphase configuration of the second set of secondary windings are in phase shifting relationships relative to the first multiphase configuration of the set of primary windings so that AC power emerging from the first and the second set of secondary windings is phase shifted relative to AC power applied to the primary windings, characterized in that outputs of the main rectifier (130, 230, 330. 430) and the first (140, 240, 340, 440) and second (150, 250, 350, 450) auxiliary rectifiers are connected together in series so that output voltages of the auxiliary rectifiers and the main rectifier are stacked to provide voltage boosting. a main rectifier (130, 230, 330, 430); a first auxiliary rectifier (140, 240, 340, 440); a second auxiliary rectifier (150, 250, 350, 450); and a transformer assembly including (120, 220, 320, 420): a set of primary windings (122, 222, 322, 422) arranged in a first multiphase configuration and connected to the main rectifier; a first set of secondary windings (124, 224, 324, 424) arranged in a second multiphase relationship and connected to the first auxiliary rectifier; and a second set of secondary windings (126, 226, 326, 426) arranged in a third multiphase configuration and connected to the second auxiliary rectifier, wherein the second multiphase configuration of the first set of secondary windings and the third multiphase configuration of the second set of secondary windings are in phase shifting relationships relative to the first multiphase configuration of the set of primary windings so that AC power emerging from the first and the second set of secondary windings is phase shifted relative to AC power applied to the primary windings, characterized in that outputs of the main rectifier (130, 230, 330. 430) and the first (140, 240, 340, 440) and second (150, 250, 350, 450) auxiliary rectifiers are connected together in series so that output voltages of the auxiliary rectifiers and the main rectifier are stacked to provide voltage boosting. a set of primary windings (122, 222, 322, 422) arranged in a first multiphase configuration and connected to the main rectifier; a first set of secondary windings (124, 224, 324, 424) arranged in a second multiphase relationship and connected to the first auxiliary rectifier; and a second set of secondary windings (126, 226, 326, 426) arranged in a third multiphase configuration and connected to the second auxiliary rectifier, wherein the second multiphase configuration of the first set of secondary windings and the third multiphase configuration of the second set of secondary windings are in phase shifting relationships relative to the first multiphase configuration of the set of primary windings so that AC power emerging from the first and the second set of secondary windings is phase shifted relative to AC power applied to the primary windings, characterized in that outputs of the main rectifier (130, 230, 330. 430) and the first (140, 240, 340, 440) and second (150, 250, 350, 450) auxiliary rectifiers are connected together in series so that output voltages of the auxiliary rectifiers and the main rectifier are stacked to provide voltage boosting.