Zero-voltage-switching three-phase single-stage power factor correction convertor

As an alternative to two-stage cascaded AC/DC power convertors, the paper presents a zero-voltage-switching (ZVS) single-state three phase rectifier with input/output isolation. The proposed rectifier contains five active devices driven by a simple PWM controller and operates in the discontinuous conduction mode (DCM) for the input power factor correction part and in the continuous conduction mode (CCM) for the DC/DC power conversion part. A simple circuit topology, ZVS, for all active devices and diodes and low device voltage and current stresses make the proposed power convertor attractive for low power (<10 kW) applications. Operational principles, analysis and design procedures are presented and verified by the experimental results obtained from a 5 kW prototype