Single-Phase Hybrid Switching-Capacitor APFC Converter

A novel single-phase hybrid switching capacitor APFC converter is proposed in this paper. By integrating the boost APFC converter with the switching capacitor converter, the active switch number is reduced, the voltage gain is increased with a high power factor. The dynamic voltage regulation is also improved with no need for the large capacitor. Besides, in order to achieve APFC and the boost capability of switching capacitor cells simultaneously, this paper proposes an average-current control with mode dispatching method. The theoretical analysis of this converter is studied and verified preliminarily through simulation. A 500W with 85-265V AC input and 600V DC output voltage prototype is built to evaluate experimentally. The efficiency of the proposed converter is around 95.33% with a power factor above 0.99.