Browsing by Author "Ahmed, S.F.B."

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    Close loop analysis of a single phase high-efficiency AC-DC CUK converter with low input current THD and improved power factor
    (Institute of Electrical and Electronics Engineers Inc., 2018-07-02) Akter, K.,; Sarowar, G.,; Ahmed, S.F.B.
    In this paper, design and analysis of a novel single phase AC-DC converter based on ĆUk topology is proposed. Performance comparisons are shown between open loop and closed loop configurations of the proposed converter which reveals that the inconsistencies arising in open loop connection can be mitigated sufficiently by adding PFC controller to it. The closed loop technique applied to the proposed bridgeless converter results in low input current THD at input AC mains along with near unity (0.99) power factor. Thus, significant improvements in overall power quality of the system is achieved despite the absence of input side filtering. The proposed circuit is also non-burdensome as it gets rid of bulky filtering capacitors. The aforementioned circuit performances are observed based on software simulations using PSIM 9.1 professional environment.
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    Modeling and simulation of input switched AC-DC SEPIC converter with PFC control for optimized operatio
    (Institute of Electrical and Electronics Engineers Inc., 2018) Akter, K.,; Sarowar, G.,; Hoque, M.A.,; Ahmed, S.F.B.
    A new configuration of single phase AC-DC SEPIC converter with PFC controller has been designed for achieving higher efficiency, power factor with lower THD as compared to conventional converters. The proposed bridgeless converter provides near unity power factor than conventional converters. The proposed converter utilizes a single switch with two diodes at the input side. Conventional converter suffers from lots of demerits such as high THD in input current, low power factor whereas newly designed converter significantly improves these parameters. Despite satisfactory results in open loop configuration, the PFC controller has been added to obtain more precise results. Results were obtained by using PSIM software.