Patent ID: 8687388

Claim:
A low input-current harmonic three-phase boost rectifier, comprising: an input stage for receiving a three-phase input voltage in relation to a neutral node; an output stage adapted to couple to at least one load, the output stage comprising a plurality of output capacitors coupled to said neutral node; one or more capacitors coupled between corresponding phases of said three-phase input voltage and said neutral node; one or more switching converter stages, each having a plurality of switches coupled to said neutral node, said plurality of switches operating with a fixed duty cycle, said fixed duty cycle being a substantially 50% duty cycle, the one or more converter stages further comprising one or more boost inductors that are coupled to corresponding phases of the three-phase input voltage, one or more input bridge diodes coupled between the one or more boost inductors and said plurality of switches of the converter stages, and one or more flying capacitors coupled across said plurality of switches of the converter stages; one or more controllers adapted to vary the switching frequency of the plurality of switches based on at least one of a condition of the at least one load or the input voltage; and one or more decoupling stages, each decoupling stage comprising a primary inductive element and a secondary inductive element, wherein the primary inductive element has a primary terminal and the secondary inductive element has a secondary terminal, said primary terminal and said secondary terminal being connected across a switching converter stage to inductively decouple the output stage from the switching converter stage.