Improved analysis, design and control for interleaved dual-phase ZVS GaN-based totem-pole PFC rectifier with coupled inductor

This paper proposes the improved analysis, design and control for the interleaved dual-phase ZVS GaN-based totem-pole PFC rectifier with coupled inductor. Traditionally, the analysis and control of the coupled-inductor-based dual-phase totem-pole PFC are not only complicated, but also significantly different from those of the non-coupled-inductor-based dual-phase totem-pole PFC. In this paper, a Δ-type circuit model for the coupled inductor is proposed to be utilized. Based on the Δ-type coupled inductor model, the coupled-inductor-based PFC can be simplified as a non-coupled-inductor-based PFC with an auxiliary inductor between the two phases. Thus, this paper proposes to simplify all the analysis, design and control of the coupled-inductor-based dual-phase totem-pole PFC to those of the non-coupled-inductor-based dual-phase totem-pole PFC with an auxiliary inductor. Based on this novel concept, the simplified analysis, the closed-form analytical model and the full-range ZVS control strategy are proposed and discussed. Finally, the proposed concepts are verified by the experimental results.