The concept of connecting two boost half bridge DC-DC converter modules in input-paral- lel output-parallel configuration is presented. The input-parallel-output-parallel （IPOP） converter consists of multiple boost ...The concept of connecting two boost half bridge DC-DC converter modules in input-paral- lel output-parallel configuration is presented. The input-parallel-output-parallel （IPOP） converter consists of multiple boost half bridge （BHB） DC-DC converter modules which are connected in par- allel at the input and output side. This kind of converter is an attractive solution for high power ap- plications. The correlation between input current sharing （ICS） and output current sharing （OCS） of the IPOP converter basic modules is described. Two loop control strategies, consisting of input cur- rent loop and output voltage loop, have been developed to achieve equal ICS and OCS in this present work. The control strategy for the IPOP configuration of boost haft bridge DC-DC converter has been verified for different load conditions （half load and full load）, The IPOP system proposed here is comprising of two modules but it can be extended to three or more. The performance of the pro- posed system along with the control strategy is verified by simulation in MATLAB using Simpower tool. Finally the satisfactory simulation results are obtained.展开更多
In this study,the rational construction of Fe^(Ⅲ)-centered porphyrin-based bifunctional ionic porous organic polymers(Fe-IPOP1/2)for a one-step,halogen-free,cascade transformation of olefins and CO_(2) to cyclic carb...In this study,the rational construction of Fe^(Ⅲ)-centered porphyrin-based bifunctional ionic porous organic polymers(Fe-IPOP1/2)for a one-step,halogen-free,cascade transformation of olefins and CO_(2) to cyclic carbonates as compared to the conventional two-step process involving epoxides is presented.The ionic polymers,Fe-IPOP1/2 showed selective and recyclable uptake of CO_(2) with an interaction energy of 32.2/39.6 kJ mol^(-1) signifying the stronger interaction of carbon dioxide with the frameworks.Both the polymers were found to be thermally stable up to 300℃ and exhibited promising catalytic performance in the one-step,halogen-free synthesis of cyclic carbonates under eco-friendly,cocatalyst/solvent-free,atmospheric pressure conditions.The excellent catalytic activity of Fe-IPOP1/2 for a one-pot synthesis of cyclic carbonates has been ascribed to the presence of highly exposed oxophilic Fe^(Ⅲ) sites and nucleophilic Br-anions in the polymers.Notably,this one-pot synthesis strategy was extended for the transformation of various substituted olefins to their respective carbonates in good yield and selectivity.Further,Fe-IPOP1 showed good reusability with retention of catalytic activity for multiple cycles of usage.展开更多
文摘The concept of connecting two boost half bridge DC-DC converter modules in input-paral- lel output-parallel configuration is presented. The input-parallel-output-parallel （IPOP） converter consists of multiple boost half bridge （BHB） DC-DC converter modules which are connected in par- allel at the input and output side. This kind of converter is an attractive solution for high power ap- plications. The correlation between input current sharing （ICS） and output current sharing （OCS） of the IPOP converter basic modules is described. Two loop control strategies, consisting of input cur- rent loop and output voltage loop, have been developed to achieve equal ICS and OCS in this present work. The control strategy for the IPOP configuration of boost haft bridge DC-DC converter has been verified for different load conditions （half load and full load）, The IPOP system proposed here is comprising of two modules but it can be extended to three or more. The performance of the pro- posed system along with the control strategy is verified by simulation in MATLAB using Simpower tool. Finally the satisfactory simulation results are obtained.
基金the Science&Engineering Research Board(SERB),Department of Science and Technology,Govt.of India,for financial support(CRG/2018/001176).
文摘In this study,the rational construction of Fe^(Ⅲ)-centered porphyrin-based bifunctional ionic porous organic polymers(Fe-IPOP1/2)for a one-step,halogen-free,cascade transformation of olefins and CO_(2) to cyclic carbonates as compared to the conventional two-step process involving epoxides is presented.The ionic polymers,Fe-IPOP1/2 showed selective and recyclable uptake of CO_(2) with an interaction energy of 32.2/39.6 kJ mol^(-1) signifying the stronger interaction of carbon dioxide with the frameworks.Both the polymers were found to be thermally stable up to 300℃ and exhibited promising catalytic performance in the one-step,halogen-free synthesis of cyclic carbonates under eco-friendly,cocatalyst/solvent-free,atmospheric pressure conditions.The excellent catalytic activity of Fe-IPOP1/2 for a one-pot synthesis of cyclic carbonates has been ascribed to the presence of highly exposed oxophilic Fe^(Ⅲ) sites and nucleophilic Br-anions in the polymers.Notably,this one-pot synthesis strategy was extended for the transformation of various substituted olefins to their respective carbonates in good yield and selectivity.Further,Fe-IPOP1 showed good reusability with retention of catalytic activity for multiple cycles of usage.
