2,290 research outputs found

    Designing and Implementing a Micro-controller based Primary-side Sensing Flyback Converter for LEDs Driver

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    The fast development of LED and its applications has enabled a new generation of lighting device with higher efficiency and long lifespan. By employing a primary-side sensing flyback converter and the PIC18F micro-controller series, an LED driver could achieve two important features: (1) the compatibility with the available lighting fixtures, and (2) reducing unit price. The flyback converter was chosen for its simplicity, competitive low cost, and its ability to provide a constant output current, a necessarily important factor to an LED driver. Meanwhile, the PIC18F micro-controller series offer numerous advanced features which include but not limited to pulse-width modulation (PWM), 10-bit 13-channel Analog-to-Digital Converter (ADC) etc., which suitably meet the requirements for regulating a primary-side sensing flyback converter. The design process was first conducted in simulation stage with aid from Matlab®-Simulink and Cadence OrCAD Capture CIS (PSpice). By using PI based control scheme and making full use of built-in Analog Behavioral Modelling (ABM) blocks, the simulation-relevant difficulties due to lacking of appropriate model for the PIC18F series micro-controller were completely solved. The simulation results matched well with the intended design specifications: the output voltage is 32 VDC while the load current is 350 mA. More importantly, the simulation results demonstrated the feasibility of deploying a primary-side sensing flyback converter in conjunction with a PIC18F micro-controller as an LED driver. Next, a demo printed-circuit board (PCB) was layout by using OrCAD PCB Editor. Finally, the PIC18F4550 micro-controller was programmed to undertake control tasks of the LED driver. The experimental results reflect the project\u27s success with all the parts of the driver harmoniously work as expected

    Design & Implementation of Closed Loop PID Mechanism for wire Tension Control (Tensioner) in Winding Machine

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    Wire tensioners form a crucial part of winding equipment. The tensioner is used to deliver the wire by measuring the maximum tension that wire would tolerate. The quality of winding and productivity of winding machines depends on wire tensioners to a large extent. Usually, the tensioners used in winding application are completely manufactured mechanical with no/little electronics in it, which are not compatible and reliable for variable tensions and different diameter of wires. Since these tensioners are not flexible, for winding machines, alternatives based on Digital Signal Processors (DSP) or any appropriate Controllers are used. We are proposing a PIC Controller based tensioner that would deliver a constant tension with closed loop PID control at constant position of dancer arm mainly by using servomotor and stepper motor. This method is economical and easily scalable to any equivalent controller architecture. This work was supported by Synthesis Winding Technologies Pvt. Ltd, Bangalore

    Baud rate variations effect on virtual channel based on PIC microcontroller

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    Recent year in the world the real applications, usually needed only a few key features of Universal Asynchronous Receiver Transmitter (UART). It is a type of serial communication protocol, which improves the problem of parallel communication and develops effectively in several services. This paper presents a transceiver system based on PIC microcontroller. It also presents software designs to transmit and receive data through the virtual channel. The system is designed to study the effects of baud rate variations between transmitter and receiver for noise and noiseless AWGN channel. The system has been simulated by Proteus simulator version 8.1, and then tested successfully at baud rates (2400, 4800, 9600, and 19200) bps. Simulation results show that the error rate has zero values at the desired baud rate value, and also, at the adjacent values. Thus, the zero level of error rate is increased by increasing baud rate values, which fixed by the transmitter and vice versa

    Smart Automatic Power Factor Correction Device

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    This document will discuss on research and theory of the chosen topic for Final Year Project, which is Smart Automatic Power Factor Correction Device (PFCD). The objective of this project is to conduct study on the theory of power factor correction, application in industry and residential, simulate the circuit of power factor with different load, experimentally test the power factor concept and further improve it to a smart automatic power factor correction device

    MOBILE ROBOTS: OBSTACLE AVOIDANCE AND MANUVERING

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    The objective of the project is to design and implement a mobile robot. The robot will be able to avoid obstacles and have its own decision making capability. It will be a part of the preparation for the department of Electrical Electronics Engineering University Teknoiogi Petronas for various activities which require robotics design participation. As one of the final year electrical electronics student I have been given the chance to be part of the path finding. The scope of the study will be mainly on the design and implementation of the robot from scratch or little knowledge. The study will be handled part by part for components needed for the robot. First will be the structure of the robot. Next the mobility and drive circuit will be design to enable the robot to be mobile. Sensors will be put in place so that the robot is able to "feel" and "see" it's surrounding. When this is done a "brain" or microcontroller will be put in place so that it is able to control itself and make simple decision. The methodology or approach can be divided into software and hardware. Basically the same methodology will be use again and again in the module design process. Finally the parts will be integrated as one mobile robot. This will become the final robot. In the discussion part, the findings are being discussed in detail. The problem and the solution for the problem is being discussed base on the student point of view. The reader might get the idea on the limitations of a mobile robot as the size and weight increases. These are the factors that are becoming the bottle neck in this design project. Before ending the chapter, some recommendation has been suggested for further improvement by future robotics builder. The suggestions are made base on ^q current available technology and also the experience gain by the student through out this design project

    Analysis and comparison of Scalextric, SCX, and Carrera Digital slot car systems: A mechatronic engineering design case study

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    Digital slot cars operate by transmitting both power and data over a single pair of wires much like DCC-controlled model railways and some home automation systems. In this manuscript we analyse and compare the cars, track, controllers, and electronic data transmission protocols of the three popular digital slot car systems

    The Design of an Autoguide System Prototyped for Conventional Vehicle on Highway

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    Accident problem is a one of the big issue in this country. From the statistic made by Jabatan Keselamatan Jalan Raya Malaysia, the accidents tragedy in Malaysia increase by year. Conventional Vehicle (heavy vehicle) is the top ranking for the numbers of accident happen in Malaysia. Neglect the human factors identified as major causes of heavy vehicle accidents in the PLUS highway in 2007. Based on the research by Department of Traffic Safety PLUS also, 38 percent of heavy vehicle accident caused by driver drowsiness, while 33.4 percent involved drivers who were driving too fast. 14 percent of accidents were attributed to the driver lost control of their vehicles. 14.6 percent were caused by technical problems such as brake failures and tire burst or monasteries. Most of the accident causes is because of the driver. So, the topic has chosen for the final year project ‘The Design of an Autoguide System Prototyped for Conventional Vehicle on highway’ is to replace the driver to control the direction and speed of vehicle. When this system applied to the conventional vehicle, it may reduce the number of accident causes by driver itself. The main steps to build the autoguide prototyped are start with study of literature review. This help to choose the suitable hardware and software such as sensor. After that, design the circuit for the prototyped and programmed the peripheral interface controller (PIC) by using CCompiler. Then, build the complete prototyped and followed by testing the prototyped at the track that build before. This prototyped used PIC16F877A microcontroller as its brain and receive input from ultrasonic sensor(SRF04) at front and side of prototyped. Front sensor while detect the obstacle at front to control the speed and side sensor will detect the wall of track to control the direction or position of prototyped. The prototyped that has developed is to prove about the autoguide system. This can show how the system work and the material needed in order to build the real product of autoguide system in real life
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