NEW GENERATION THREE-PHASE RECTIFIER

This paper describes an investigation into the development of a new generation of threephase rectifier, used to power telecommunications equipment. Traditionally, the topology used is a single-phase two-stage design, with a boost converter at the input to the first stage and an isolated dcdc converter making up the second stage. The boost converter provides power factor correction which is necessary in order to comply with the IEC1000-3-2 standard. The dc-dc stage provides isolation, as well as the fast feedback necessary to regulate the output voltage ripple. This is necessary in order to comply with the psophometric noise standard ITU-T0.41. A two-stage design however, results in a cascade effect contributing to the total power losses. A new rectifier is introduced that can satisfy the required telecommunication industry standards, whilst also having only a single-stage design. This paper discusses the principles of operation and the performance characteristics of the new generation three-phase rectifier.