Patent ID: 9154048
Filing Date: 2015-10-06
Classification: H02M

Abstract:
1. An AC/DC converter system comprising: an input circuit for connection to a three-phase AC source; an isolation transformer comprising a symmetrical core with a set of primary windings and first and second sets of secondary windings wound on the symmetrical core providing balanced flux in all three phase and magnetically coupling the first and second sets of secondary windings to the set of primary windings, the first and second sets of secondary windings phase shifted by select amounts from the set of primary windings, the set of primary windings connected to the input circuit; an AC/DC converter comprising first, second and third three-phase, six-pulse rectifiers, the first three-phase six-pulse rectifier being powered by the first set of secondary windings, the second three-phase six-pulse rectifier being powered by the second set of secondary windings, and the third three-phase six-pulse rectifier being powered by the input circuit; a current balancing three-phase inductor electrically connected between the input circuit and the third three-phase six-pulse rectifier; and an output circuit for connection between the AC/DC converter and a DC load.