A simple three-phase boost-mode PFC rectifier

A simple and economical three-phase boost-mode PFC rectifier is proposed in this paper. The new rectifier is obtained by simplifying the power-circuit of the previously proposed third-harmonic-current modulation scheme and employing a newly developed current-synthesis and modulation technique. Unlike the conventional third-harmonic-current modulation rectifier consisting of a split output-circuit, the proposed rectifier employs a unified output-circuit to simplify the power-circuit and output-voltage control. Further, a unique input-current synthesis is developed to improve the current-waveform. Comparing with the conventional rectifier, the new rectifier obtains a simpler power-circuit, higher-quality of the input-current and a wider DC-voltage regulation-range (or lower minimum output-voltage). In the following, theories of the proposed current-synthesis and the modulation are described. Then experimental waveforms are shown to confirm the validity of the theories and applicability of the rectifier in practice