Operation of a three-phase/three-level-rectifier in wide range and single-phase applications

A prominent boost-type 3-level topology, which is proved to represent a cost effective and highly efficient solution for switched mode rectifiers is inspected towards its application at wide input voltage range and power line distorted conditions including single-phase supply. Supplementary measures for a low cost control scheme are described to facilitate the operation under these unfavorable conditions. Shutdown of e.g. telecommunication plants can thus be avoided, if a maximum power limitation is observed. The inherent adaptation of the control scheme to the largely varying supply conditions supports the high yielding efficiency at high output voltage, even when supplied out of two phases. Simulation and measurement results prove the maturity of this rectifier scheme