Analysis of three-phase AC-DC converter using three-phase/two-phase balanced transformer

Based on the slope relationship between the actual inductor current and the expected inductor current, the zero-crossing crossover distortion mechanism of the boost inductor in a single-phase power factor corrector (PFC) is analysed. Several circuits are proposed to improve the terminal voltage of the boost inductor near the zero crossing of the grid voltage, so th at the actual inductor current slope is significantly greater than that of the expected inductor current without changing the original control structure and control strategy. Then the principle is analysed using a three-phase/two-phase balanced transformer (e.g. Scott Transformer) and a single-phase power factor corrector to implement a three-phase AC-DC converter, as well as the possibility of its application with aviation power supply frequency.