A general three-phase PFC controller. II. For rectifiers with a series-connected dual-boost topology

For pt.I see ibid., p.2504-11 (1999). This paper presents a general control approach to achieve power-factor-correction (PFC) for three-phase boost rectifiers with center-tapped or split DC output capacitors. These rectifiers can be decoupled into a series-connected dual-boost topology during each 60° of line cycle although they have different configurations. A new extension of constant frequency one-cycle control strategy is proposed to provide the core PFC function for the dual-boost topologies. The additional logic circuits rotate the PFC functions in three-phase. No multiplier is necessary to scale the current reference as required by many other approaches. Hence this control approach is simple and general. Furthermore, the constant switching frequency modulation is desirable for EMI filter design and switching losses are minimized since only two high frequency switches are controlled at any time. Simulation and experimental results are present to verify the theoretical analysis