Power conversion circuits

摘要

According to one embodiment, an AC power system includes a first AC/DC converter to be coupled to a direct current (DC) load and a multi-phase AC power supply. The system further includes 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 system further includes a controller coupled to the first and second AC/DC converters, where the controller is configured to generate a gate trigger signal for firing each of the rectifiers for the first and second AC/DC converters. 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. 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.

主权项

1. An alternating current (AC) power conversion system, comprising:
a first AC/DC converter to be coupled to a first direct current (DC) load and an AC power supply, the first AC/DC converter having a first positive group of rectifiers and a first negative group of rectifiers; a second AC/DC converter to be coupled to a second DC load and the AC power supply, the second AC/DC converter having a second positive group of rectifiers and a second negative group of rectifiers; an interphase transformer having a first winding and a second winding mutually wounded onto a common core, wherein the first winding is coupled in series with the first DC load and an output of the first AC/DC converter, and wherein the second winding is coupled in series with the second DC load and the second AC/DC converter; 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 of the first and second AC/DC converters, wherein the first positive group of rectifiers of the first AC/DC converter is fired at a firing angle advanced to a nominal firing angle, wherein the second positive group of rectifiers of the second AC/DC is fired at a firing angle lagging from the nominal firing angle during a first switching cycle, wherein the first negative group of rectifiers of the first AC/DC converter is fired at a firing angle lagging to the nominal firing angle, and wherein the second negative group of rectifiers of the second AC/DC is fired at a firing angle advanced from the nominal firing angle during the first switching cycle.