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RISS 인기검색어
- 검색키워드
- 저자 : Ghafoorifard, Hasan (검색결과 3 건)
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A Trade-Off between the Efficiency, Ripple and Volume of a DC-DC Converter
Taherbaneh, Mohsen,Rezaie, Amir H.,Ghafoorifard, Hasan,Mirsamadi, Maddad,Menh, Mohammad B. The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.5
In space qualified DC-DC converters, optimization of the following electrical characteristics is of greater interest in comparison with other specifications; power loss/efficiency, output voltage ripple and volume/weight. The main goal of this paper is to present an appropriate solution for optimizing the above mentioned characteristics. For this purpose, a comprehensive power loss model of a DC-DC converter is fully developed. Proper models are also demonstrated for assessment of the output voltage ripple and the utilized transformer volume as the bulkiest component in a DC-DC converter. In order to provide a test bed for evaluation of the proposed models, a 50W push-pull DC-DC converter is designed and implemented. Finally, a novel cost function with three assigned weight functions is proposed in order to have a trade-off among the power loss, the output voltage ripple and the utilized transformer volume of the converter. The cost function is optimized for applications in which volume has the highest priority in comparison with power loss and ripple. The optimization results show that the transformer volume can be decreased by up to 51% and this result is verified by experimental results. The developed models and algorithms in this paper can be used for other DC-DC converter topologies with some minor modifications.
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A Trade-Off between the Efficiency, Ripple and Volume of a DC-DC Converter
Mohsen Taherbaneh,Amir H. Rezaie,Hasan Ghafoorifard,Maddad Mirsamadi,Mohammad B. Menhaj 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.5
In space qualified DC-DC converters, optimization of the following electrical characteristics is of greater interest in comparison with other specifications; power loss/efficiency, output voltage ripple and volume/weight. The main goal of this paper is to present an appropriate solution for optimizing the above mentioned characteristics. For this purpose, a comprehensive power loss model of a DC-DC converter is fully developed. Proper models are also demonstrated for assessment of the output voltage ripple and the utilized transformer volume as the bulkiest component in a DC-DC converter. In order to provide a test bed for evaluation of the proposed models, a 50W push-pull DC-DC converter is designed and implemented. Finally, a novel cost function with three assigned weight functions is proposed in order to have a trade-off among the power loss, the output voltage ripple and the utilized transformer volume of the converter. The cost function is optimized for applications in which volume has the highest priority in comparison with power loss and ripple. The optimization results show that the transformer volume can be decreased by up to 51% and this result is verified by experimental results. The developed models and algorithms in this paper can be used for other DC-DC converter topologies with some minor modifications.
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Mansour Asgari,Hossein Afarideh,Hassan Ghafoorifard,Eskandar Asadi Amirabadi 한국원자력학회 2021 Nuclear Engineering and Technology Vol.53 No.12
In the radiation protection application, the metal-polymer composites have been developed for theirradiation shielding properties. In this research, the elastomer composites doped by 10 mm and100nm sizeof lead, bismuth and tungsten particles as filler with 30 and 60 wt percentages were prepared. To surveythe shielding properties of the polymer composites using gamma-ray emitted from 152Eu and 137Cssources, the gamma flux was measured by using NaI(Tl) detector, then the linear attenuation coefficientwas calculated. Also, the Monte Carlo simulation (MCs) method was used. The results showed a directrelationship between the linear attenuation coefficients of the absorbent and filler ratio. Also, thedecrease in the particle size of the shielding material in each weight percentage improved the radiationshielding features. When the dimension of the particles was in the order of nano-size, more attenuationwas achieved. At low energies used for medical diagnostic X-ray applications due to the predominance ofthe photoelectric effect, bismuth and lead were suitable selection as filler.
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