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HNC - Analogue/Digital - Power Supplies Assignment

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HNC Electrical & Electronic Engineering Teesside University delivered by Middlesbrough College Analogue & Digital Devices Assignment 1: Power Supplies Grade: Distinction
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   Power Supplies HNC Electrical and Electronic Engineering Year One - 2013/14 Module: Module Digital & Analogue Devices Keith A. Hudson   M1306117 03/12/2013   <This page is intentionally blank>  Keith A. Hudson 2   Digital / Analogue M1306117 03 December, 2013 HNC Electrical and Electronic Engineering Year One: 2013/14 Contents 1 Linear Power Supply (Q1a) ........................................................................................................................................ 4 1.1 Transformer ...................................................................................................................................................... 4 1.2 Rectifier ............................................................................................................................................................. 5 1.3 Smoothing ......................................................................................................................................................... 5 1.4 Regulator ........................................................................................................................................................... 6 1.5 The Power Supply ............................................................................................................................................. 6 2 Load Regulation (Q1b) .............................................................................................................................................. 7 3 Switched Mode vs. Linear (Q2) ................................................................................................................................. 8 4 Construction of a Linear Power Supply (Q3a) ........................................................................................................... 9 4.1 Power Source .................................................................................................................................................... 9 4.2 Transformer (TR1) ............................................................................................................................................. 9 4.3 Rectifier (BR1) ................................................................................................................................................... 9 4.4 Smoothing (C1).................................................................................................................................................. 9 4.5 Regulator (U1) ................................................................................................................................................... 9 4.6 Load (RV1) ......................................................................................................................................................... 9 4.7 Complete circuit - simulation .......................................................................................................................... 10 4.8 Complete circuit - wired .................................................................................................................................. 11 5 Calculations (Q3b) ................................................................................................................................................... 13 6 Power Supply Analysis and Improvements (Q3c) ................................................................................................... 15 7 Bibliography ............................................................................................................................................................ 17  Keith A. Hudson 3   Digital / Analogue M1306117 03 December, 2013 HNC Electrical and Electronic Engineering Year One: 2013/14 Figures Figure 1: The conversion steps. ........................................................................................................................................ 4 Figure 2: The changes in the wave form of the voltage / current. ................................................................................... 4 Figure 3: The magnetic flux of a transformer ................................................................................................................... 4 Figure 4: Bridge using separate diodes ............................................................................................................................. 5 Figure 5: Bridge diode package ......................................................................................................................................... 5 Figure 6: Regulator TO-220 package ................................................................................................................................. 6 Figure 7: The complete power supply............................................................................................................................... 6 Figure 8: Block diagram of a switched mode power supply ............................................................................................. 8 Figure 9: The power supply with no load ........................................................................................................................ 10 Figure 10: The power supply under full load .................................................................................................................. 10 Figure 11: Wiring the circuit on a Digiac 3000  –  Power supply module ......................................................................... 11 Figure 12: Almost 5V output ........................................................................................................................................... 11 Figure 13: Full load - 51.7mA .......................................................................................................................................... 11 Figure 14: Part load - 41.7mA ......................................................................................................................................... 11 Figure 15: Oscilloscope display ....................................................................................................................................... 12 Tables Table 1: Types of transformer ........................................................................................................................................... 5 Table 2: Load regulation of a 12VDC, 0-5A power supply ................................................................................................ 7 Table 3: Advantages / disadvantages - Switched mode and Linear power supply ........................................................... 8 Table 4: Load Regulation ................................................................................................................................................. 13 Table 5: Line Regulation .................................................................................................................................................. 13 Table 6: %Efficiency of the power supply (calculated at full load) ................................................................................. 13 Table 7: Power loss ......................................................................................................................................................... 14 Table 8: %Efficiency of the Transformer (calculated at full load) ................................................................................... 15 Table 9: Efficiency of the Rectifier (calculated at full load) ............................................................................................ 15 Table 10: Adjusting the Transformer to optimise the Regulator minimum input voltage ............................................. 16 Table 11: Efficiency of the Rectifier (calculated at full load) .......................................................................................... 16
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