Abstract
Three-phase buck–boost power-factor correction (PFC) rectifiers are characterised by a unity power-factor mains behaviour and/or sinusoidal input currents and are providing a wide-output voltage range. In this study, an extension of a state-of-the-art three-phase buck–boost PFC rectifier topology is proposed. The DC output of the new topology does not suffer from a high-frequency common-mode voltage with respect to the (grounded) mains star point, which alleviates electromagnetic interference concerns. Also, the blocking voltage requirements of the AC-side switches are reduced significantly (almost by a factor of two for a 400 V line-to-line mains and a 400 V DC output), which facilitates a broad selection of cost-effective power semiconductors for the system's realisation. The rectifier can be controlled with a simple feedback system and the concept is especially suitable for low-power applications. A 1 kW hardware demonstrator is employed to verify the results of theoretical considerations. The system seamlessly operates in the buck and boost regime and achieves conversion efficiencies of 95.3% and mains current total harmonic distortion figures in the range of 1–5%.
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