Programmable Device Circuits and Systems

K. Kandasamy ¹, M. Rajaram ²

Affiliations
1 Department of Electronic and Communication Engineering, University College of Engineering, Villupuram-103, IN
2 Anna University, Chennai-25, IN

Abstract

This dissertation discusses about the application of a SEPIC DC-DC converter for a permanent magnet brushless DC motor (PMBLDCM) drive, run by single phase AC mains as single stage power factor correction fed through double bridge rectifier. A three phase voltage source inverter is used as an electronic commutator to operate the permanent magnet brushless DC motor. The advantage of these motors is the removal of brushes, leading to eliminate many problems associated with brushes. The scope of this project is in the use of PMBLDC motor as a drive for the compressor of air-conditioners, fans etc. The switch control separates the two procedures, adjustment of SEPIC converter, and regulation of speed can respond immediately during transient commutation and robustness can be improved and thereby the performance. The proposed permanent magnet brushless DC motor drive is designed and modeled, and its performance is evaluated in MATLAB-SIMULINK.

Keywords

SEPI Converter, Powerfactor PF Correction (PF), Permanent-Magnet (PM) Brushlessdcmotor (PMBLDCM), Voltage Control, Voltage-Source Inverter (VSI).

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M. Rajaram ¹, R. Jegan ², Thirumurgan Thirumurgan ², V. Sumathy ³

Affiliations
1 Park College of Engineering and Technology, Kaniyur, Coimbatore – 641659, Tamil Nadu, IN
2 Department of ECE, Park College of Engineering and Technology, Kaniyur, Coimbatore – 641659, Tamil Nadu, IN
3 Government College of Technology, Coimbatore – 641013, Tamil Nadu, IN

Abstract

Traditionally, real-time systems are built for avery small set of mission-critical applications like space crafts, avionics and other distributed control systems. The various steps in building such systems include, characterizing the workload, designing scheduling algorithms and performing schedulability analysis and Conventional teaching methodologies for real-time systems have primarily focused on these topics and the choice is completely justified for the targeted traditional real-time systems. However with the evolution of small scale real-time embedded systems like cell phones, PDAs, sensor motes and other portable control systems primarily driven by a Real-Time Operating System (RTOS), the conventional teaching methods fall short in several ways. This is because, building such real-time embedded systems poses certain different design and implementation challenges branching out of the severe resource constraints that these devices should operate under. In order to keep pace with these changing trends, we have enhanced our real-time systems course in two different ways. First, we have included the relevant topics like compiler-level and operating systems-level energy aware real-time scheduling algorithms and further developed corresponding assignments and projects to reinforce student learning in these topics. We present some of these details here. Secondly, we have developed a series of laboratory experiments based on commercial RTOSs which give students a rich hands-on experience in building real-time embedded systems We have tried two different RTOSs namely, RT-Linux and VxWorks in two consecutive years. In this paper, we present the similarities and differences between two the RTOS platforms and their impact on student learning.

Keywords

Real-Time Systems, Embedded Systems, Kernel Programming, RTLinux, VxWorks, and Scheduling.

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