i-manager's Journal on Embedded Systems (JES)


Volume 1 Issue 3 August - October 2012

Article

65nm CMOS LVDS I/O Transmitter Implementation with 600Mbps Data Rate

Alexey Balashov* , Andrey Malkov**
*-** Freescale Semiconductor, Moscow, Russia.
Balashov,A., and Malkov,A., (2013). 65nm CMOS LVDS I/O Transmitter Implementation with 600 Mbps Data Rate. i-manager’s Journal on Embedded Systems, 1(3), 1-6. https://doi.org/10.26634/jes.1.3.1989

Abstract

Low Voltage Differential Signaling (LVDS) technology is an effective solution for the physical layer of high-speed data applications. The advantages of the LVDS interface include high data rates, low noise generation, and low power consumption across the entire speed range. Different approaches of LVDS circuit implementation are considered in this article. The LVDS transmitter circuit implementation in the I/O pad cell for microprocessor product based on 65nm CMOS bulk technology is presented. The designed LVDS transmitter supports a 600 Mbps data transfer rate and supply current no more than 5mA.

Research Paper

Comparison Of Multi Output Series Resonant Inverter And Cyclo Inverter Induction Heater Systems

S. Jaanaa Rubavathy* , Dr. P. Murugesan**
* Research Scholar, Sathyabama University, Chennai, India.
** Professor, S.A. Engineering College, Chennai, India.
Rubavathy,J.S., and Murugesan.P. (2012). Comparison of Multi Output Series Resonant Inverter and Cyclo Inverter Induction Heater Systems. i-manager’s Journal on Embedded Systems, 1(3), 7-13. https://doi.org/10.26634/jes.1.3.1990

Abstract

In this paper, utility frequency AC to High frequency AC power conversion circuit without DC smoothing capacitor is proposed, which employs asymmetric voltage cancellation control for output power, a generalized control technique for Series resonant inverter and cyclo- inverter for output voltage control. It ensures better efficiency performances than conventional control strategies. The development of two output Series resonant inverter and cyclo-inverter topology for induction heating system ensures reduction of size, weight and number of components. The proposed inverters are a two output extension of a full bridge inverter. It allows the control of two output powers, simultaneously and independently, up to their rated power, by using 3 legs of full bridge Series resonant inverter and cyclo-inverter. One leg for common control and other two legs for independent control. To verify the theoretical predictions, the proposed two output series resonant inverter and cyclo-inverter systems are designed and simulated using MATLAB simulink.  The THD and output powers of both the systems are compared.

Research Paper

A Hybrid Evolutionary Programming – Tabu Search Method with Cooling-Banking Constraints for Hydro Thermal Scheduling in a Large Power System

Nimain Charan Nayak* , C. Christober Asir Rajan**
* Research Scholar, Dept. of EEE, Sathyabama University, Chennai, India.
** Associate Professor, Dept. of EEE, Pondicherry Engineering College, Puducherry, India.
Nayak,N,C., and Rajan,C,A.C., (2012). A Hybrid Evolutionary Programming – Tabu Search Method With Cooling – Banking Constraints For Hydro Thermal Scheduling In A Large Power System. i-manager’s Journal on Embedded Systems, 1(3), 14-25. https://doi.org/10.26634/jes.1.3.1991

Abstract

This Paper proposes a new hybrid algorithm for solving the Unit Commitment problem in Hydrothermal power system using a hybrid Evolutionary Programming — Tabu Search method with cooling-banking constraints. The main objective of this paper is to find the generation scheduling by committing the generating units such that the total operating cost can be minimized by satisfying both the forecasted load demand and various operating constraints of the generating units. It is a Global optimization technique for solving Unit Commitment Problem, operates on a system, which is designed to encode each unit’s operating schedule with regard to its minimum up/down time. In this method, the unit commitment schedule is coded as a string of symbols. An initial population of parent solutions is generated at random. Here the parents are obtained from a pre-defined set of solutions i.e. each and every solution is adjusted to meet the requirements. Then, random recommitment is carried out with respect to the unit’s minimum down time. Tabu Search (TS) is a powerful optimization procedure that has been successfully applied to a number of combinatorial optimization problems. It avoids entrapment at local optimum by maintaining a short term memory of recently obtained solutions. The memory structure assists in forbidding certain moves that deteriorates the quality of the solution by assigning Tabu status to the forbidden solutions. The Tabu status of a solution can be overruled if certain conditions are satisfied expressed in the form of Aspiration Level. Aspiration Level (AL) adds flexibility in Tabu Search by directing the search towards attractive moves. The best population is selected by Evolutionary Strategy. Numerical results are shown comparing the cost solutions and computation time obtained by using the proposed hybrid method than conventional methods like Dynamic Programming, Lagrangian Relaxation.

Research Paper

Optimization of Energy Efficient Subcarrier and Power Allocation in Multi User OFDMA Systems

M. Vadivel* , H. Ranganathan**
* Research Scholar, Sathyabama University, Chennai, India.
** Principal, Rajiv Gandhi College of Engineering, Chennai, India.
Vadivel.M., and Ranganathan.H. (2012). Optimization of Energy Efficient Subcarrier and Power Allocation in Multi User OFDMA Systems. i-manager’s Journal on Embedded Systems, 1(3), 26-31. https://doi.org/10.26634/jes.1.3.1992

Abstract

To utilize the energy efficiently which is available in battery of all the mobile stations is an important scenario in wireless communication systems. Better spectral efficiency can be achieved in a wireless communication by finding the energy required per bit. In this paper, we are analyzing the energy efficient resource allocation methods for a Multi User (MU) Orthogonal Frequency Division Multiple Access (OFDMA) system. We are proposing the better energy efficient optimization algorithm to maximize the energy efficiency by assuming the factors CSI, user selection, subcarrier selection, data rate selection and power allocation. The proposed optimization algorithm minimize the total transmit power consumption with the required number of bits. Simulation results show that the proposed optimization algorithm provides better performance which is very close to optimal performance with low transmit power consumption and low complexity.

Research Paper

A Comparative Study of P, I, P-I and I-P Controllers for Speed Control of Brushless DC motor using Powersim (PSIM) software

G. Prasad* , G Tulasi Ram Das**
* Department of Electrical and Electronics Engineering, GIT, GITAM University, Visakhapatnam, 530045, Andhra Pradesh, India.
** Department of Electrical Engineering, College of Engineering, Osmania University, Hyderabad, Andhra Pradesh, India.
*** Hon'ble Vice-Chancellor, JNTUK, Kakinada, Andhra Pradesh, India.
Prasad.G., Prasad.P.V.N., and Das,T,R.G. (2012). A Comparative Study Of P, I, P-I And I-P Controllers for Speed Control of Brushless DC Motor using Powersim (PSIM) Software. i-manager’s Journal on Embedded Systems, 1(3), 32-39. https://doi.org/10.26634/jes.1.3.1993

Abstract

This paper presents a comparative study of various controllers for the speed control of BLDC Motor. The most commonly used controller for the speed control of motor is Proportional-Integral (P-I) controller. However, the P-I controller has some disadvantages such as: the high starting overshoot, sensitivity to controller gains and sluggish response due to sudden disturbance. So, the relatively new Integral-Proportional (I-P) controller is proposed to overcome the disadvantages of the P-I controller and the performance these controllers are compared with P, I, P-I and I-P controllers.  Simulation results are presented and analyzed for all the controllers. It is observed that I-P controllers give better responses than the traditional P-I for the speed control of BLDC motor drives.