Research on Five-Level PFC Circuit Topology Based on Switch-Diode-Capacitor Network

Abstract

In this paper, a family of a novel single-phase three-level PFC based on a switch-capacitor cell is proposed. The proposed PFC topologies have the characteristics of high power factor, low voltage stresses, and low power losses. Firstly, the derivation process of the novel PFC topologies is introduced in detail. Based on a representative circuit of the proposed novel PFC topologies, its operation principle is analyzed from the aspects of working current paths, key waveforms, and pulse distribution. Meanwhile, its equivalent circuit model is deduced. Secondly, the performance of the proposed PFC topologies is analyzed. Then the modulation technology based on capacitor voltage balancing is designed for the proposed topologies. Finally, an experimental prototype with a rated power of 800 W and a DC output voltage of 400 V is built. The experimental analysis is carried out from both the steady state and dynamic state. The experimental results verify the feasibility of the proposed novel three-level PFC topologies and the effectiveness of the modulation technology.