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Chennai, India

Muthukrishnan P.,Stpeters University | Dhanasekaran R.,Syed Ammal Engineering College
Journal of Theoretical and Applied Information Technology

A Conventional Boost Converter is not capable for obtain a high voltage gain even extreme duty cycle maintain the triggering circuit diagram. In order to increase the voltage gain for the new Boost converter from the solar power application. In this paper boost converter specialty is achieved 10 times that of input voltage and more than 10 times of input voltages is possible from output side by using coupled inductor and parallel capacitor. The proposed boost converter output voltage is obtained 600V from source input of 60V and output power is 900 watts. The output voltage is high and voltage stress across the active switch is minimized and output ripples also minimized. In this paper the high power rating from low input voltage rating of the input source and also capable to go for AC power application whenever adding the inverter circuit to the main circuit diagram. © 2005 - 2014 JATIT & LLS. All rights reserved. Source

Bharathi Raja N.,Stpeters University | Gangatharan N.,k-Technology
International Review on Computers and Software

In this paper, a new low complexity transform which combines the fast Walsh Hadamard transform (WHT) and fast Hartley transform (FHT) into a single fast orthonormal transform is proposed for orthogonal frequency division multiplexing (OFDM) across additive white Gaussian noise (AWGN) channel model. The new transform is developed through the sparse matrices method in OFDM system, which is capable of reducing peak to average power ratio (PAPR) of the transmitted symbols with better bit error rate (BER) performance degradation at a reasonable reduced complexity. The system performance is verified via simulations. Compared with the FHT method, the proposed OFDM signal can be generated by FHT via WHT with lower PAPR and also the computational complexity nearly halved. It reveals that the proposed OFDM has the same BER performance as FHT, but proposed OFDM transceiver shows superiority on computational complexity. The proposed scheme is a cost-effective and efficient multicarrier modulation scheme. © 2015, Praise Worthy Prize S.r.l. - All rights reserved. Source

Ramnath B.V.,Sri Sairam Engineering College | Elanchezhian C.,Sri Sairam Engineering College | Nirmal P.V.,Sri Sairam Engineering College | Kumar G.P.,Sri Sairam Engineering College | And 4 more authors.
Fibers and Polymers

Present technological development and innovation needs a better class of material that meets all the practical applications along with its environmental friendly nature and economical value. Hybrid natural fiber composites, a sector of natural composites meets these requirements. This paper deals with fabrication, mechanical characterization of a hybrid (Jute+Flax+GFRP) composite and also the comparison of it with the (Jute+GFRP) based composite. These composites are fabricated using hand lay-up technique. The arrangement of hybrid composite is such that a layer of vertically laid flax fiber is flanked between layers of horizontally laid jute fiber. Epoxy resin alongside with HY951 hardener is used as the binding agent throughout the layer. Glass fiber laminates are used on both sides for improving the surface finish and surface hardness. The volumetric fraction is such that one third of total volume is occupied by Jute and Flax fibers. Test results shows that the hybrid natural composite has excellent properties under tensile, flexural loading. At last failure morphology analysis is done using Scanning Electron Microscope (SEM) and the internal structure of the broken specimen is discussed. © 2014 The Korean Fiber Society and Springer Science+Business Media Dordrecht. Source

Saravanan D.,Stpeters University | Gopinath M.,Coimbatore Institute of Technology
International Journal of Control Theory and Applications

In this paper a bridgeless Cuk converter is used for Power factor correction (PFC) for a BLDC motor. Bridgeless Cuk converter has only two semiconductor switches in the current flowing path. During each interval of the switching cycle it result in less conduction losses and an improved thermal management compared to the conventional Cuk PFC rectifier. To achieve almost unity power factor and to reduce the input current stress, the topologies are designed to work. This paper works on the limitations of the conventional PFC Cuk converter are resolved. The proposed Bridgeless High Gain CUK converter (BL-HG-CUK) for BLDC motor is simulated in MATLAB and the corresponding results show the better power quality indices such as power factor and Total Harmonic Distortion (THD). © International Science Press. Source

Kirubanandasarathy N.,Stpeters University | Karthikeyan K.,ABB
European Journal of Scientific Research

In this paper a VLSI design of a MIMO-OFDM system is presented. We start with the design of an OFDM physical layer that follows the IEEE standard 802.11a. We then devise an efficient pipelined architecture, and incorporate it into the MIMO-OFDM physical layer. In our experiments, we compare our pipelined architecture to the baseline MIMO-OFDM physical layer implementation. The baseline MIMO-OFDM system uses the same number of fast Fourier transform (FFT) blocks as antennas. The implementation efficiency of our pipelined architecture, compared with the baseline MIMO-OFDM system, is evaluated using two methods: (1) using just one FFT block, and (2) using Radix-2 pipelined streaming FFT block, versus a Radix-4 FFT block used in the baseline MIMOOFDM system. Our experiments show that atleast 30 percent of the resources in the baseline MIMO-OFDM system can be saved using our proposed architecture, while achieving the same data rate. We also show that this data rate can be doubled, with approximately the same resource reduction. Moreover, by exploiting the dynamic reconfiguration, our MIMO-OFDM system can adapt to various operating modes. We also present experimental results and analysis regarding dynamic reconfiguration. © 2012 EuroJournals Publishing, Inc. Source

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