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Zheng Dong - One of the best experts on this subject based on the ideXlab platform.
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current Source mode single inductor multiple output led driver with single closed loop control achieving independent dimming function
IEEE Journal of Emerging and Selected Topics in Power Electronics, 2018Co-Authors: Zheng DongAbstract:Single-inductor multiple-output (SIMO) light-emitting diode (LED) drivers have the advantages of being compact, efficient, and low cost. However, the voltage-to-current transfer function of each output of the SIMO converter is not independent, with significant cross regulation issues that necessitate the use of complex closed-loop control for achieving independent dimming function. This paper proposes a current-Source-mode (CSM) SIMO dc–dc converter from duality principle, which is shown to be more suited for LED driving due to widened control range of the duty cycle and inherently inductor-less LED driving topology. The outputs of the CSM SIMO dc–dc converter are inherently independent, resulting in very simple control Requirement involving only one closed-loop controller for providing the constant current feeder, and several simple open-loop controllers for independent dimmable driving of LEDs. Simultaneous voltage step-up and step-down of multiple outputs is an added feature that simplifies the input power Source Requirement, especially for portable applications. The whole system is simple, reliable, and low cost. Taking the CSM single-inductor dual-output dc–dc converter as an example, we illustrate the circuit operation and establish a small-signal model for facilitating the design of the feedback control. A direct duty-cycle dimming method is described. Experimental tests are presented for verification.
Basundhara Kanari - One of the best experts on this subject based on the ideXlab platform.
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Effect of environmental factors and carbohydrate on gellan gum production.
Applied Biochemistry and Biotechnology, 2002Co-Authors: Basundhara Kanari, Ratindra Ram Banik, Nath UpadhyayAbstract:Submerged culture fermentation studies were carried out in batch mode for optimizing the environmental parameters and carbon Source Requirement by Pseudomonas elodea for the production of gellan gum. The maximum production of gellan gum was obtained with 16-h-old culture and 8% inoculum at 30°C and pH 7.0 after 52 h of incubation (6.0 g/L). Of the various carbon Sources tested, 2% sucrose, glucose, and soluble starch yielded considerably high amounts of gellan. Studies on the concentration of various carbohydrates on gellan gum production indicated that the optimum concentration of glucose and starch was 3%, whereas for sucrose it was 4%. The addition of glucose in the medium above 3% had a detrimental effect on gellan yield. The investigation of intermediate two-step addition of glucose under identical conditions of fermentation showed an enhanced production of gellan (8.12 g/L) as compared with the control (6.0 g/L). To optimize the recovery of gellan from fermented broth, different solvents were tested for precipitation of gellan gum. Among the various solvents tested, tetrahydrofuran gave better recovery of gellan (82%) as compared with the conventional solvent isopropanol (49%).
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Effect of environmental factors and carbohydrate on gellan gum production.
Applied biochemistry and biotechnology, 2002Co-Authors: Basundhara Kanari, Ratindra Ram Banik, Siddha Nath UpadhyayAbstract:Submerged culture fermentation studies were carried out in batch mode for optimizing the environmental parameters and carbon Source Requirement by Pseudomonas elodea for the production of gellan gum. The maximum production of gellan gum was obtained with 16-h-old culture and 8% inoculum at 30 degrees C and pH 7.0 after 52 h of incubation (6.0 g/L). Of the various carbon Sources tested, 2% sucrose, glucose, and soluble starch yielded considerably high amounts of gellan. Studies on the concentration of various carbohydrates on gellan gum production indicated that the optimum concentration of glucose and starch was 3%, whereas for sucrose it was 4%. The addition of glucose in the medium above 3% had a detrimental effect on gellan yield. The investigation of intermediate two-step addition of glucose under identical conditions of fermentation showed an enhanced production of gellan (8.12 g/L) as compared with the control (6.0 g/L). To optimize the recovery of gellan from fermented broth, different solvents were tested for precipitation of gellan gum. Among the various solvents tested, tetrahydrofuran gave better recovery of gellan (82%) as compared with the conventional solvent isopropanol (49%).
Siddha Nath Upadhyay - One of the best experts on this subject based on the ideXlab platform.
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Effect of environmental factors and carbohydrate on gellan gum production.
Applied biochemistry and biotechnology, 2002Co-Authors: Basundhara Kanari, Ratindra Ram Banik, Siddha Nath UpadhyayAbstract:Submerged culture fermentation studies were carried out in batch mode for optimizing the environmental parameters and carbon Source Requirement by Pseudomonas elodea for the production of gellan gum. The maximum production of gellan gum was obtained with 16-h-old culture and 8% inoculum at 30 degrees C and pH 7.0 after 52 h of incubation (6.0 g/L). Of the various carbon Sources tested, 2% sucrose, glucose, and soluble starch yielded considerably high amounts of gellan. Studies on the concentration of various carbohydrates on gellan gum production indicated that the optimum concentration of glucose and starch was 3%, whereas for sucrose it was 4%. The addition of glucose in the medium above 3% had a detrimental effect on gellan yield. The investigation of intermediate two-step addition of glucose under identical conditions of fermentation showed an enhanced production of gellan (8.12 g/L) as compared with the control (6.0 g/L). To optimize the recovery of gellan from fermented broth, different solvents were tested for precipitation of gellan gum. Among the various solvents tested, tetrahydrofuran gave better recovery of gellan (82%) as compared with the conventional solvent isopropanol (49%).
Nath Upadhyay - One of the best experts on this subject based on the ideXlab platform.
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Effect of environmental factors and carbohydrate on gellan gum production.
Applied Biochemistry and Biotechnology, 2002Co-Authors: Basundhara Kanari, Ratindra Ram Banik, Nath UpadhyayAbstract:Submerged culture fermentation studies were carried out in batch mode for optimizing the environmental parameters and carbon Source Requirement by Pseudomonas elodea for the production of gellan gum. The maximum production of gellan gum was obtained with 16-h-old culture and 8% inoculum at 30°C and pH 7.0 after 52 h of incubation (6.0 g/L). Of the various carbon Sources tested, 2% sucrose, glucose, and soluble starch yielded considerably high amounts of gellan. Studies on the concentration of various carbohydrates on gellan gum production indicated that the optimum concentration of glucose and starch was 3%, whereas for sucrose it was 4%. The addition of glucose in the medium above 3% had a detrimental effect on gellan yield. The investigation of intermediate two-step addition of glucose under identical conditions of fermentation showed an enhanced production of gellan (8.12 g/L) as compared with the control (6.0 g/L). To optimize the recovery of gellan from fermented broth, different solvents were tested for precipitation of gellan gum. Among the various solvents tested, tetrahydrofuran gave better recovery of gellan (82%) as compared with the conventional solvent isopropanol (49%).
Ratindra Ram Banik - One of the best experts on this subject based on the ideXlab platform.
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Effect of environmental factors and carbohydrate on gellan gum production.
Applied Biochemistry and Biotechnology, 2002Co-Authors: Basundhara Kanari, Ratindra Ram Banik, Nath UpadhyayAbstract:Submerged culture fermentation studies were carried out in batch mode for optimizing the environmental parameters and carbon Source Requirement by Pseudomonas elodea for the production of gellan gum. The maximum production of gellan gum was obtained with 16-h-old culture and 8% inoculum at 30°C and pH 7.0 after 52 h of incubation (6.0 g/L). Of the various carbon Sources tested, 2% sucrose, glucose, and soluble starch yielded considerably high amounts of gellan. Studies on the concentration of various carbohydrates on gellan gum production indicated that the optimum concentration of glucose and starch was 3%, whereas for sucrose it was 4%. The addition of glucose in the medium above 3% had a detrimental effect on gellan yield. The investigation of intermediate two-step addition of glucose under identical conditions of fermentation showed an enhanced production of gellan (8.12 g/L) as compared with the control (6.0 g/L). To optimize the recovery of gellan from fermented broth, different solvents were tested for precipitation of gellan gum. Among the various solvents tested, tetrahydrofuran gave better recovery of gellan (82%) as compared with the conventional solvent isopropanol (49%).
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Effect of environmental factors and carbohydrate on gellan gum production.
Applied biochemistry and biotechnology, 2002Co-Authors: Basundhara Kanari, Ratindra Ram Banik, Siddha Nath UpadhyayAbstract:Submerged culture fermentation studies were carried out in batch mode for optimizing the environmental parameters and carbon Source Requirement by Pseudomonas elodea for the production of gellan gum. The maximum production of gellan gum was obtained with 16-h-old culture and 8% inoculum at 30 degrees C and pH 7.0 after 52 h of incubation (6.0 g/L). Of the various carbon Sources tested, 2% sucrose, glucose, and soluble starch yielded considerably high amounts of gellan. Studies on the concentration of various carbohydrates on gellan gum production indicated that the optimum concentration of glucose and starch was 3%, whereas for sucrose it was 4%. The addition of glucose in the medium above 3% had a detrimental effect on gellan yield. The investigation of intermediate two-step addition of glucose under identical conditions of fermentation showed an enhanced production of gellan (8.12 g/L) as compared with the control (6.0 g/L). To optimize the recovery of gellan from fermented broth, different solvents were tested for precipitation of gellan gum. Among the various solvents tested, tetrahydrofuran gave better recovery of gellan (82%) as compared with the conventional solvent isopropanol (49%).