Articles written in Sadhana

    • Reliability study of high gain DC-DC converters based on RRPP I-IIA configuration for shipboard power system


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      This paper examines the family of high gain DC-DC converter derived from I-IIA configuration, primarily based on Reduced Redundant Power Processing (RRPP). The primary intention of this study is to determine the best topology for high voltage applications. The steady-state analysis of the proposed topologies isinvestigated and verified. The denominators of the voltage conversion ratio are observed to be similar for all the derived topologies, and they are in quadratic form. A comprehensive assessment is done based on voltage gain, voltage stress across storage element, switch stress voltage, switch utilization factor and inductor value. The best topology is identified and analyzed thoroughly in Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM). Also, its performance evaluation and reliability study are also carried out. Theadvantage of that topology is validated using theoretical and simulation results. Finally, 40 W prototype is developed to verify the results.

    • Expandable transformer-less high-gain dc–dc converter based on quasi-Z source and multiplier cells


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      In this paper, a novel high-gain transformer-less dc–dc converter is presented. This topology is acquired by integrating two high-gain cells like quasi-Z source (QZ) and gain multiplier (GM) cells with a quadratic boost converter. The boosting factor of the proposed topology is increased both in the numerator and denominator of the voltage conversion ratio, which furnishes flexibility in designing the converter. The cost of the converter is low due to lesser voltage stress across the devices. Operating principle and steady-state analysis of the converter are analyzed in continuous conduction and discontinuous conduction modes. Considering the boundary conduction mode and voltage ripple, the design expression of the passive components is derived. A suitable duty cycle for realizing higher voltage gain is determined. The performance of the converter is analyzed and compared to those of similar QZ-based converters. To validate the theoretical study, a 50 W prototype is implemented and tested.

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