| Abstract |
This paper presents an optimal control method in order to achieve high power factor correction and simultaneously minimizing the necessary active and passive components (LC filters, semiconductor switches etc) in battery charging structures. The aim of this method is to achieve high power factor correction without using an excessive P.F.C. prestage. Furthermore, the control loop of this method demands less components than any case of the classical P.F.C. techniques, since it manages to overcome the input current sense. Thus, the control circuit becomes simplier and by utilizing a single converter only can be performed both high P.F.C. and battery charging with a specific strategy (e.g. constant current, constant voltage e.t.c.). An extended theoretical analysis of this method will be presented and a comparison between the P.F.C. preregulation, the current mode control technique and the proposed technique - all applied on a flyback charger - will be accomplished (based on PSPICE simulation results), in order to highlight the advantages of the proposed method. |
