bringing the world locally
About us
Subscription
Review Committee
Conferences
Publications
FAQ
Contact
 
Members Login
    You are not logged in.
Username


Password



CiiT International Journal of Programmable Device Circuits and Systems
Print: ISSN 0974 – 973X & Online: ISSN 0974 – 9624

20082009 2010 2011 2012 2013
   January February March April May June July August September November December

Issue: April 2013
DOI: PDCS042013001
Title: A New Resonant Converter Operating Above Resonance for DC to DC Energy Conversion
Authors: G. Keerthi Krishna and Dr.SP. Umayal
Keywords: DC to DC Energy Conversion, Loaded Resonant Converter, PID Controller, Resonant Converter, Soft Switching
Abstract:
     There are two major penalties occur in off-line switching power supplies: high switching losses, and an operating environment, which is very responsive to the radiation of Electromagnetic Interference (EMI) and Radio Frequency Interference (RFI). The switching losses are a largest initiator of EMI (conducted) and RFI (radiated), so their control and reduction is a major profit to the power supply designer. Resonant techniques offer a hope for greatly reducing the switching losses and hence the factors causative to the EMI and RFI. In addition, this technique offers many other advantages such as small volume, and light weight of components due to high switching frequency, high efficiency and low reverse recovery losses in diodes owing to low di/dt at the switching instant. This work presents a resonant DC to DC converter which operating at a high frequency. The proposed circuit consists of an L-C-L resonant inverter and a bridge rectifier. Output stage of the converter is filtered by means of a low pass filter. A PID controller is provided in feedback loop for better performance. Finally, a simulation model is developed in MATLAB/SIMULINK environment. Moreover the projected topology is apparently suitable for power electronics production applications such as switching power supplies, battery chargers, telecom power supplies etc.

Full PDF


Issue: April 2013
DOI: PDCS042013002
Title: Evolutionary Performance of Graded Emigration in BBO for Yagi-Uda Antenna Design Optimization
Authors: Satvir Singh, Shelja Tayal, Etika Mittal and Shivangna
Keywords: Yagi-Uda Antenna, Antenna Gain, BBO, GEBBO
Abstract:
     Biogeography Based Optimization (BBO) is one of the most popular swarm based optimization algorithms that has shown impressive performance over other Evolutionary Algorithms (EAs). A new algorithm is proposed in this paper by making migration variations in BBO, i.e., Graded Emigration Biogeography Based Optimization (GE-BBO) to improve the performance of BBO. Yagi-Uda is one of most widely antenna designs used at Very High Frequency (VHF) and Ultra High Frequency (UHF) due its high gain, low cost and constructional ease. Designing a Yagi-Uda antenna involves determination of wire-element lengths and spacings in between them. Antenna geometry bear highly complex and nonlinear relationships with antenna gain, impedance and Single Lobe Level (SLL) at a particular frequency of operation. In this paper, a comparative study between BBO and GE-BBO is presented for faster optimization of antenna designs for maximum gain. The best antenna designs are tabulated and average of 10 monte-carlo simulations are plotted for these stochastic algorithms iterative performances in the ending sections.

Full PDF


Issue: April 2013
DOI: PDCS042013003
Title: An Efficient Nano Sensor for Strain Sensing and Defect Detection in Engineering Components
Authors: N. Marie Claude, N. Marie Wilson and V. Kannan
Keywords: Carbon Nanotubes (CNT), Polyvinylidenefluoride (PVDF), Composite Films, Strain Sensor, Defect Detection
Abstract:
     This work demonstrates the application of PVDF/CNT composite as strain sensor and defect detector. The PVDF/CNT films were prepared by solution/filtration method and were bonded directly onto specimens by nonconductive adhesive. The two electrodes were connected on to PVDF/CNT films with silver conducting epoxy to reduce contact resistance. Conventional Strain gauge is also attached to other end of the specimen for comparison. For testing purpose 9CR 1MO material is considered and cut into dog bone shaped structures according to ASTM standards. Tensile load is applied by subjecting the specimen in a servo hydraulic test frame .Calibration curves were plotted with change in voltage versus the strain obtained in test specimen. The result shows that there is linear change in voltage across the film when subjected to tension. The defect detection is done using electronic measurement technique. The results shows that the presence of defect was marked by high value of resistance on that particular region and the resistance value was low in non-defective region.

Full PDF


Issue: April 2013
DOI: PDCS042013004
Title: An Interleaved Buck Converter with PID Controller
Authors: G. Saranya Devi and Dr.SP. Umayal
Keywords: Duty Cycle, Interleaved Buck Converter (IBC), PID Controller, Switching Loss
Abstract:
     This work proposes a new interleaved buck converter (IBC) which maintains a constant output voltage to a specified value with a PID controller. The PID controller varies the duty cycle of the switches to regulate the output voltage. The proposed converter has low switching losses, reduced voltage stress and high step-down conversion ratio which is suitable for the applications where the input voltage is high. Here, two active switches are connected in series with a coupling capacitor in the power path which operates below 50% of duty ratio to reduce the voltage stress of the active switch to half the input value before turn on and after turn off. As a result of this the switching losses and capacitive discharge losses are reduced. Hence the efficiency of the converter is increased.

Full PDF


Issue: April 2013
DOI: PDCS042013005
Title: A Mesh Networking Based Solution on Power Management
Authors: M. Shalin, P. Deepak Franklin and J. Singarevelan
Keywords: AMI, GSM, MDMS, Zigbee
Abstract:
     The development of automatic metering system and power management is presented in this paper. The system consists of Zigbee Digital Power meters installed at every consumer’s unit and an automatic e-Billing system at the energy provider’s side. The Zigbee Digital Power meter (ZPM) is a single phase digital kWh power meter with embedded Zigbee modem which utilizes the Wireless sensor network to send its power usage reading and the electricity bill back and forth wirelessly. At the power provider side an e-billing system is used to manage the received zigbee meter reading, compute the billing cost, and to publish billing notification to its respective consumer through wireless modem. Also the circuit is designed to manage power, when the generation of power is less available at the electricity board. The controller prioritizes the electrical appliances in each node (i.e. houses) similar to that of a mesh network. Then it gives the highest priority to the most necessary appliance needed by the user then in the same way it gives priority to all other appliances connected to the node. When the power value reaches below a threshold, the PC at the power provider section gives a command to the controller, to supply the power only to the higher priority appliances and stop providing power to the lower ones. Likewise depending on the availability, power is equally distributed to all the nodes connected to the energy provider so that each node can at least make use of the most used appliance without total power shutdown.

Full PDF


Issue: April 2013
DOI: PDCS042013006
Title: Design and Implementation of Bridgeless SEPIC Rectifier for Power Factor Correction
Authors: G. Malathi and Dr.SP. Umayal
Keywords: Bridgeless Rectifier, Cuk Converter, Power Factor Correction (PFC), Rectifier, Sepic Converter
Abstract:
     A Bridgeless SEPIC rectifier for power factor correction with low conduction losses and load regulation is proposed. The proposed SEPIC rectifier can achieve low conduction losses by provides two semiconductor switches at any time of conduction. This Sepic will act in DCM mode. The DCM operation gives additional advantages such as, zero-current turn-off; zero-current turn-on in the power switches in the output diode and reduces the complexity of the control circuitry .The output to input relation is controlled by PI controller. The proportional controller checks the error between actual and reference voltage. The integral controller will compensate this error by comparing the error with repeated sequence.DCM is preferred to produce almost unity power factor. At any time of voltage regulation line side power factor is maintained.

Full PDF


Issue: April 2013
DOI: PDCS042013007
Title: Low Power Low Area Novel Multiplier For DSP Applications
Authors: K.V. Gowreesrinivas and K. Anusudha
Keywords: Multiplier, FPGA, Xilinx
Abstract:
     The Multiply-accumulate (MAC) unit is one of the basic components in any DSP applications like filtering, FFTs and DCT cores. The design units of MAC consist of Multiplier and Accumulator unit. The multiplier plays major role in the design of MAC unit and the fundamental constraints that are imposed in the design of multiplier unit are area and power consumption. These constraints determine the logic families used to make the Multiplier, as well as the algorithm used for the multiplier circuits. One such multiplier circuit is the Booth Multiplier, which reduces the number of cycles per operation and area, but which consumes more power. In our project, we will design a novel Multiplier which meets the requirements of low area and low power. One of the most important design choices to make will be the logic family in case of ASIC.We propose another modification to increase the speed: incorporating the pipeline structure.
This module can be developed in FPGAs. We will use the Verilog tool to design the module in FPGA. The simulators used for this will be Xilinx ISE13.1.

Full PDF


Issue: April 2013
DOI: PDCS042013008
Title: A Fast Computation on Flipping Structure of VLSI Architecture for 2D-Discrete Wavelet Transforms
Authors: Lenin Raja and A. Merline
Keywords: Fixed Point Arithmetic, Fractional Bit, Image Coding, VLSI, DWT,WLWT, Wavelet Transforms, DSP System Generator
Abstract:
     A High speed and reduced –area 2D discrete wavelet transform (2D-DWT) architecture is proposed. Previous DWT architecture is mostly based on the modified weighted lifting scheme. In order to achieve a critical path with only one multiplier. Experimental measurement of design performance in terms of area, speed and power for 90nm Complementary Metal Oxide Semiconductor (CMOS) implementation are presented, Results indicate that while BP design exhibit inherent speed advantages.DS design requires significantly fewer hardware resource with increased precision and DWT level.. In addition to the BP and DS design, a novel flexible DWT processor is presented, which supports run time and increase the performance of the DWT parameters .In this proposed approach were give an efficient hardware support to the VLSI architecture achieved by Weighted Lifted Wavelet Transform(WLWT).

Full PDF


Issue: April 2013
DOI: PDCS042013009
Title: Compensation of Distribution System Voltage Sag by using SMES based DVR
Authors: M. Maga Rathi and E. Parimalasundar
Keywords: Dynamic Voltage Restorer (DVR), Power Conditioning System (PCS), Pulse Width Modulation (PWM), Superconducting Magnetic Energy Storage (SMES)
Abstract:
     Voltage sag is the most common type of power quality disturbance in the distribution system. This paper presents Superconducting Magnetic Energy Storage (SMES) based Dynamic Voltage Restorer (DVR) has the potential to bring real power storage characteristic to protect consumers from the grid voltage fluctuations. Due to the characteristic of high energy density and quick response, a superconducting magnet is selected as the energy storage unit to improve the compensation capability of DVR. The principle of Superconducting Magnetic Energy Storage based Dynamic Voltage Restorer is analyzed in this paper. The performance of the Superconducting Magnetic Energy Storage is validated through simulations using MATLAB SIMULINK.

Full PDF


Issue: April 2013
DOI: PDCS042013010
Title: Dynamic Stability Enhancement by Static Synchronous Series Compensator based Supplementary Damping Controller
Authors: Jino Jose and Sunila Susan Thomas
Keywords: Switching, Voltage Profile, Instability, SA
Abstract:
     Oscillations of power systems are generally associated with transmission system disturbances such as step changes in load, sudden change of generator output, transmission line switching, and short circuits etc. Depending on the characteristics of the power system, the oscillations may last for 3-20 seconds after a severe fault. During such angular oscillation period, significant cycle variations in voltages, currents, and transmission line flows will take place. It is important to damp these oscillations as quickly as possible because they cause mechanical wear in power plants and many power quality problems. Although power system stabilizers(PSS) provides supplementary feedback stabilizing signals they are liable to cause great variation in voltage profile and may result in system instability under severe disturbances. To overcome this problem Static Synchronous Series Compensator (SSSC) based supplementary damping controllers are introduced.SSSC damping controller can contribute to damping of low frequency oscillations. The design problem of the SSSC based damping controller is formulated as an optimization problem and Simulated annealing algorithm (SA) is employed to search for optimal controller parameters.

Full PDF


Issue: April 2013
DOI: PDCS042013011
Title: Influence of Operating Parameters in Abrasive Waterjet Cutting of Aluminium
Authors: Dr.M. Chithirai Pon Selvan and Dr.N. Mohana Sundara Raju
Keywords: Abrasive Waterjet; Water Pressure, Mass Flow Rate; Traverse Speed; Standoff Distance; Depth of Cut, Surface Roughness
Abstract:
     Abrasive waterjet cutting is one of the non-traditional cutting processes capable of cutting wide range of hard-to-cut materials. This paper assesses the influence of process parameters on depth of cut and surface roughness which are important cutting performance measures in abrasive waterjet cutting of aluminium. Experiments were conducted in varying water pressure, nozzle traverse speed, abrasive mass flow rate and standoff distance for cutting aluminium plates using abrasive waterjet cutting process. The effects of these parameters on depth of cut and surface roughness have been studied based on the experimental results. It was recommended that a combination of high water pressure, more abrasive mass flow rate, low traverse speed and short standoff distance be used to produce more depth of cut and less surface roughness.

Full PDF