School of Engineering (SEN)

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Browsing School of Engineering (SEN) by Author "Aamar Sharif"

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    Speed control of DC motor by switch mode power supply (SMPS)
    (UNIVERSITY OF MANAGEMENT AND TECHNOLOGY, 2015) Muhammad Naeem; Aamar Sharif
    This thesis gives the whole idea and theme of the “Speed Control of DC Motor by SMPS” to the reader.An efficient and commonly use power converter nowadays is 10 Switch Mode Power Converter (SMPS), Switch Mode Supply (SMPS) and liner power supply are two types of DC power supply available in market. Due to the same power rating, customer prefers SMPS than linear power supply. SMPS is smaller, cheaper and lighter than linear power supply. SMPS also have better efficiency than linear power supply. In this thesis an AC to DC converter SMPS circuit, having a BJT's for switching operation and a PWM based feedback circuit for driving the switching of the BJT's.The ideal switch is when all power is absorbed by the load and there is hundred percent energy efficiency, there is no current when the switch is open and there is no voltage when the switch is closed. For this project, PWM (Pulse Width Modulation) is being used to drive the switches.This project is focusing on developing SMPS using fly-back converter topology. In this design the line voltage at 220V/50Hz is taken as input. An Isolation Transformer is used to isolate the DC output from input supply. The transformer output is rectified by the high frequency Diode bridge rectifier and is filtered using a capacitor to give the regulated DC output. A Voltage regulator is connected to give the precise voltage output. This regulated voltage is driven by PWM feedback signal, to control the output voltage level. The dc voltage at the output depends on the width of the switching pulse. The on and off of the switch is important because the duty cycles of the PWM is used to regulate the DC output voltage. So the desire output voltage can be produced by generate various duty cycle. School