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RISS 인기검색어
- 검색키워드
- 저자 : Gitau, Michael Njoroge (검색결과 3 건)
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Analysis and Design of a Single-Phase Tapped-Coupled-Inductor Boost DC-DC Converter
Gitau, Michael Njoroge,Mwaniki, Fredrick Mukundi,Hofsajer, Ivan W. The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.4
A single-phase tapped-inductor boost converter has been proposed previously. However, detailed characterization and performance analysis were not conducted. This paper presents a detailed characterization, performance analysis, and design expressions of a single-phase tapped-coupled-inductor boost converter. Expressions are derived for average and RMS input current as well as for RMS input and output capacitor current ripple. A systematic approach for sizing the tapped-coupled inductor, active switch, and output diode is presented; such approach has not been reported in related literature. This study reveals that sizing of the inductor has to be based on current ripple requirement, turns ratio, and load. Conditions that produce discontinuous inductor current are also discussed. Analysis of a non-ideal converter operating in continuous conduction mode is also conducted. The expression for the voltage ratio considering the coupling coefficient is derived. The suitability of the converter for high-voltage step-up applications is evaluated. Factors that affect the voltage boost ratio are also identified. The effects of duty ratio and load variation on the performance of the converter are also investigated. The theoretically derived characteristics are validated through simulations. Experimental results obtained at a low power level are included to validate the analytical and simulation results. A good agreement is observed among the analytical, simulation, and experimental results.
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Analysis and Design of a Single-Phase Tapped-Coupled-Inductor Boost DC–DC Converter
Michael Njoroge Gitau,Fredrick Mukundi Mwaniki,Ivan W. Hofsajer 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.4
A single-phase tapped-inductor boost converter has been proposed previously. However, detailed characterization and performance analysis were not conducted. This paper presents a detailed characterization, performance analysis, and design expressions of a single-phase tapped-coupled-inductor boost converter. Expressions are derived for average and RMS input current as well as for RMS input and output capacitor current ripple. A systematic approach for sizing the tapped-coupled inductor, active switch, and output diode is presented; such approach has not been reported in related literature. This study reveals that sizing of the inductor has to be based on current ripple requirement, turns ratio, and load. Conditions that produce discontinuous inductor current are also discussed. Analysis of a non-ideal converter operating in continuous conduction mode is also conducted. The expression for the voltage ratio considering the coupling coefficient is derived. The suitability of the converter for high-voltage step-up applications is evaluated. Factors that affect the voltage boost ratio are also identified. The effects of duty ratio and load variation on the performance of the converter are also investigated. The theoretically derived characteristics are validated through simulations. Experimental results obtained at a low power level are included to validate the analytical and simulation results. A good agreement is observed among the analytical, simulation, and experimental results.
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Convective Drying Modeling Approaches: a Review for Herbs, Vegetables, and Fruits
Gibson P. Mutuli,Ayub N. Gitau,Duncan O. Mbuge 한국농업기계학회 2020 바이오시스템공학 Vol.45 No.4
Purpose This paper presents advances in drying systems made through research and development. The advances have borne novel technologies that have improved energy use and optimized on food quality. Method Using a scale approach to modelling as macroscale and microscale models, the paper underscores the importance of modelling in research and development of drying systems. Results Gaps are identified in development of material properties in modelling, development of comprehensive Multiphysics models and user-friendly software for solution computation solution of the models. Conclusions Perspectives into the future of drying modelling should be concerted on the development of material properties more complete multiphysics models, and development of software that is more user-friendly and is accurate. This would facilitate the convergence of research and industry in terms of developing advanced processes. The physics-based modeling methods have shown to be promising and will presumably be an imperative tool in research and development.
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