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A Study On Security In Sensor… [9] M. Rose and K. McCloghire, Concise MIB Definitions, Mar. 1991, RFC 1212. [10] S. Gumudavelli, D. Gurkan, and R. Wang, ―Emulated network of IEEE 1451 application with multiple smart sensor reports,‖ in Proc. IEEE Sensor Appl. Symp., New Orleans, LA, 2009, pp. 304–308. [11] IEEE, IEEE Standard for a Smart Transducer Interface for Sensors and Actuators—Network Capable Application Processor (NCAP) Information Model, IEEE Std. 1451.1, 1999. [12] IEEE, IEEE Standard for A Smart Transducer Interface for Sensors and Actuators—Mixed-Mode Communication Protocols and Transducer Electronic Data Sheet (TEDS) Formats, IEEE Std. 1451.4, 2004. [13] A. Jacquot, J.-P. Chanet, K. M. Hou, X. Diao, and J.-J. Li, ―A new approach for wireless sensor network management: LiveNCM,‖ in Proc. NTMS, Nov. 2008, pp. 1–6. [14] B. Scherer, C. Toth, T. Kovacshazy, and B. Vargha, ―SNMP-based approach to scalable smart transducer networks,‖ in Proc. 20th IEEE IMTC, May 2003, pp. 721–725. [15] K. McCloghrie and A. Bierman, Entity Management Information Base, Oct. 1996, RFC 2037. www.<strong>ijcer</strong>online.com ||May ||2013|| Page 113
International Journal of Computational Engineering Research||Vol, 03||Issue, 5|| Design and Simulation of Nonisolated ZVZCS Resonant PWM Converter for High Step-Up and High Power Applications S.M.MohamedSaleem,K.KalaiRaja 1 ,A.MohamedIlyasMydeen 2 ,C.R.Mohan Raj 3 ,M.Hazina 4 1 UG Scholars,**Asst. professor, Syed Ammal Engineering College, Ramanathapuram Tamil Nadu, India ABSTRACT This paper proposes a generalized scheme of new soft-switched interleaved boost converters that is suitable for high step-up and high power applications. The proposed converter is configured with proper numbers of series and parallel connected basic cells in order to fulfill the required output voltage and power levels respectively. This leads to flexibility in device selection resulting in high component availability and easy thermal distribution. Design examples of determining the optimum circuit configuration for given output voltage gain of 8.75times is presented. KEY WORDS: High Step-Up, High Voltage Gain, Multiphase, Non-isolated, Soft Switched. I. INTRODUCTION Recently, high step-up dc-dc converters do not require isolation have been used in many applications such as dc back-up energy systems for Uninterruptible Power Systems(UPS), renewable energy systems, fuel cell systems and hybrid electric vehicles. Generally, the high step-up dc-dc converter for these applications has the following requirements. [1] High step-up voltage gain. Sometimes the voltage gain could be more than 10. [2] High current handling capability. [3] High efficiency at a desired level of volume and weight. [4] Low input current ripple. In order to provide high output voltage, the classical boost converter should operate at extremely duty cycle and then the rectifier diode must sustain a short pulse current with high amplitude. This results in severe reverse recovery as well as high EMI problems. Using an extremely duty cycle may also lead to poor dynamic responses to line to load variations. Moreover, in the high step up dc-dc converter the input current is usually large, and hence low voltage rated MOSFETs with small RDS(ON) are necessary in order to reduce the dominating conduction loss. However, the switch in the classical boost converter should sustain high output voltage as well, and therefore, the device selection is faced with a contradiction.A lot of step-up dc-dc converter topologies have been presented to overcome the aforementioned problem. Converters with Coupled inductors [1]-[5] can provide high output voltage without using high duty cycle and yet reduce the switch voltage stress. The reverse recovery problem associated with rectifier diode is also alleviated. However, they have large input current ripple and are not suitable for high power applications since the capacity of the magnetic core is considerable. The switched-capacitor converter [6]-[10] does not employ an inductor making it feasible to achieve high power density. However, the efficiency could be reduced to allow output voltage regulation. The major drawback of these topologies is that attainable voltage gains and power levels without degrading system performances are restricted.Most of the coupled-inductor and switched-capacitor converters are hard switched and therefore, they are not suitable for high efficiency and high power applications. Some soft switched interleaved high step-up converter topologies [11]-[ 18] have been proposed to achieve high efficiency at desired level of voltage and power level. In this paper, a new interleaved soft switched high step-up dc-dc converter for high efficiency, high voltage applications are presented. The proposed converter has the following advantages. [1] Reduced voltage stresses of switches and diodes, [2] ZVS turn-on the switches and ZCS turn-off the diodes. [3] Low input current ripple due to interleaved structure. [4] Reduced energy volumes of most passive components. [5] Extendibility to desired voltage gain and power level. www.<strong>ijcer</strong>online.com ||May ||2013|| Page 1
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