Patent ID: 8553440
Filing Date: 2013-10-08
Classification: H02M

Abstract:
1. An alternating current (AC) power conversion system, comprising: a first AC/DC converter to be coupled to a direct current (DC) load and a multi-phase AC power supply, the first AC/DC converter having a plurality of rectifiers including a first positive group of rectifiers and a first negative group of rectifiers; a second AC/DC converter coupled in parallel with the first AC/DC converter via an interphase transformer to the DC load and the multi-phase AC power supply, the second AC/DC converter having a plurality of rectifiers including a second positive group of rectifiers and a second negative group of rectifiers, wherein each of the rectifiers in the first positive group and the second positive group is coupled in series with a separate winding of a first inter-phase transformer, and wherein each of the rectifiers in the first negative group and the second negative group is coupled in series with a separate winding of a second inter-phase transformer; and a controller coupled to the first and second AC/DC converters, wherein the controller is configured to generate a gate trigger signal for firing each of the rectifiers for the first and second AC/DC converters, wherein during a first power cycle, a rectifier of the first AC/DC converter is fired at a firing angle advanced to a firing angle of a corresponding rectifier of the second DC/DC converter, and wherein during a second power cycle, the rectifier of the first AC/DC converter is fired at a firing angle lagging to a firing angle of the corresponding rectifier of the second AC/DC converter.