Patent ID: 7068523
Filing Date: 2006-06-27
Classification: H02M,Y02B,Y02P

Abstract:
1. A parallel, feed-forward and compensation three-phase active power factor correction circuit comprising a primary rectifier circuit I having a three-phase bridge and a filter capacitor, and an feed-forward compensation circuit II, it is characterized in that the feed-forward compensation circuit II works in such a way that a whole period of three-phase is divided into 12 steps and comprises: a plurality of bi-direction switches; a control circuit which causes said bi-direction switches in turns cut off the higher one of the two phases which are at the same polarity during the corresponding interval of the whole period, and turn on the lower one and the phase at the opposite polarity; a rectifier circuit which rectifies the lower one and the phase at the opposite polarity to supply a DC voltage; and a boost converter which boosts the DC voltage and controls current waveform of the boosted DC voltage, and then injects it into an output of said three-phase bridge.