Abstract
Paralleling of converter modules is a well-known technique that is often used in medium-power applications to achieve the desired output power by using smaller size of high frequency transformers and inductors. In this paper, a parallel-connected single-phase PFC topology using flyback and forward converters is proposed to improve the output voltage regulation with simultaneous input power factor correction (PFC) and control. The goal of the control is to stabilize the output voltage of the converter against the load variations. The paper presents the derivation of fuzzy control rules for the dc/dc converter circuit and control algorithm for regulating the dc/dc converter. This paper presents a design example and circuit analysis for 200 W power supply. The proposed approach offers cost effective, compact and efficient AC/DC converter by the use of parallel power processing. MATLAB/SIMULINK is used for implementation and simulation results show the performance improvement.
Highlights
A number of power factor correction circuits have been developed recently [1], [2], [3], [4] and [5]
A boost converter is employed for power factor correction (PFC) with DC/DC stage to improve performance or a flyback converter is used to reduce the cost
Flyback converter is regulated by a conventional PFC controller which consists of inner input current loop and outer dc-link voltage [13] to obtain high power factor
Summary
A number of power factor correction circuits have been developed recently [1], [2], [3], [4] and [5]. Paralleling of converter power modules [7] is a well-known technique that is often used in high-power applications to achieve the desired output power with smaller size power transformers and inductors [10]. Paralleling offers an opportunity to reduce the size of the magnetic components and to achieve a low-profile design for high power applications. The goal of the proposed PFC scheme is to reduce the passive component size, to employ lower rated semiconductor, and to improve total efficiency. The forward converter with DC/DC stage can offer good output voltage regulation due to the pretty dc input voltage and the flyback converter with AC/DC PFC stage fulfills input current regulation to obtain highly efficient power factor
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