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RISS 인기검색어
- 검색키워드
- 저자 : Vipan Kakkar (검색결과 3 건)
- 무료
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High Efficiency DC/DC Boost Converters for Medium/High Power Applications
Furqan Zahoor,Swastik Gupta,Vipan Kakkar 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.11
Switching Converters commonly known as DC/DC Converters have gained tremendous popularity due to their use in variety of applications such as hybrid energy systems, hybrid vehicles, satellite applications and portable electronic devices to name a few. The main positives of using high step up converters include improving voltage gain, reduction of voltage stress and current ripple. But these converters seem to have some disadvantages like very high EMI due to reverse recovery of the boost diode and considerable amount of losses which occur due to hard switching of the boost switch. Many variations of the original boost schematic have been suggested to overcome these problems. The Zero Voltage Transition (ZVT) Boost converter and Zero Current Transition (ZCT) Boost converter are such solutions. These soft switching topologies employ an auxiliary resonant circuit which allows the boost switch to turn on and off under zero voltage and zero current conditions respectively thus reducing the switching losses. In addition, these boost converter circuits have major drawback of low power efficiency particularly at light loads due to the negative value of inductor current at light loads. In this research, a novel technique for designing a boost converter is proposed. The proposed converter employs an auxiliary circuit which allows switching of the main switch as well as the auxiliary switch under zero voltage/zero current conditions. In addition, the boost converter automatically senses the zero current across the resonant inductor, thus forcing the convertor to step automatically from Continuous Conduction Mode (CCM) to Discontinuous conduction mode (DCM) when the inductor current tries to go negative. This prevents the inductor current to go negative and hence improve convertor’s power efficiency. A novel boost convertor which steps up 200V input voltage to 400V output is designed in PSIM software with a switching frequency of 100KHz. The simulation results show that the proposed convertor has an efficiency of about 99.3% at nominal output power.
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A Comprehensive Study on Design Trends and Future Scope of Implantable Drug Delivery Systems
Kritika Ramesh,Shagun Gupta,Suhaib Ahmed,Vipan Kakkar 보안공학연구지원센터 2016 International Journal of Bio-Science and Bio-Techn Vol.8 No.6
Implantable Drug Delivery System (IDDS) emerges as an achievement in healthcare that promises to optimize the therapeutic properties of drug and reduce the risks in life threatening disorders like cancer, ischemic heart attack, brain stroke, aids. The design of an implantable drug delivery system that has been made viable by the convergence of a controller for decision making and a drug delivery mechanism that delivers drug at the site of action has been discussed. This paper presents a first of its kind survey on the need for an implantable drug delivery system along with the research projects being carried out in the area of control design and drug delivery mechanisms. The advantages of IDDS are detailed with the challenges and design constraints that are faced while designing these systems. With IDDS, the patient compliance and quality of life can be enhanced considerably. This paper also investigates the possible future research scope and applications of IDDS such as for chronic disorders that need to be regularly monitored and timely treated.
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Lab-on-Chip Technology: A Review on Design Trends and Future Scope in Biomedical Applications
Shagun Gupta,Kritika Ramesh,Suhaib Ahmed,Vipan Kakkar 보안공학연구지원센터 2016 International Journal of Bio-Science and Bio-Techn Vol.8 No.5
Lab-on-Chip (LoC) integrates various analyses such as biochemical operations, chemical synthesis, DNA sequencing onto a single chip which otherwise would have been performed in laboratory taking sufficient amount of time. Due to the miniaturization of these biochemical operations, better diagnostic speed, cost efficiency, ergonomy, sensitivity and so on can be achieved. This paper gives the detailed description of Lab-on-Chip technology including its system components. Ongoing worldwide research projects based on LoC technology have been investigated and various constraints that need to be fulfilled for designing a LoC system are presented. The biomedical applications of LoC in different fields like in diagnostics, cellomics, in environmental studies to control the effect of pathogens, to check the food quality such as for the detection of various antibiotic families in raw milk have also been discussed. Finally, the current open research issues of this technology along with the possible future research scope in the biomedical area have been presented.
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