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1
**Chapter 1 Power Electronic Systems**

Introduction Power Electronics versus Linear Electronics Applications Electrónica de Potência © 2008 Jose Bastos Chapter 1 Introduction

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**Power Electronic Systems**

Block diagram Role of Power Electronics Reasons for growth Electrónica de Potência © 2008 Jose Bastos Chapter 1 Introduction

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**Linear Power Supply Series transistor as an adjustable resistor**

Low Efficiency Heavy and bulky Electrónica de Potência © 2008 Jose Bastos Chapter 1 Introduction

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**Introduction: Switching Power Electronics**

Linear regulator Goal: control VX such that Vo=Vo,REF Plus: simple accurate, high-bandwidth Minus: low efficiency Electrónica de Potência © 2008 Jose Bastos Chapter 1 Introduction

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**Switching power converters**

Vo(t) VIN <Vo> Add filtering Vo(t) VIN <Vo> Add real devices Note: only lossless elements L, C energy storage Electrónica de Potência © 2008 Jose Bastos Chapter 1 Introduction

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**Switch-Mode Power Supply**

Transistor as a switch High Efficiency High-Frequency Transformer Electrónica de Potência © 2008 Jose Bastos Chapter 1 Introduction

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**Basic Principle of Switch-Mode Synthesis**

Constant switching frequency pulse width controls the average L-C filters the ripple Electrónica de Potência © 2008 Jose Bastos Chapter 1 Introduction

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**Application in Adjustable Speed Drives**

Conventional drive wastes energy across the throttling valve to adjust flow rate Using power electronics, motor-pump speed is adjusted efficiently to deliver the required flow rate Electrónica de Potência © 2008 Jose Bastos Chapter 1 Introduction

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**Power Processor as a Combination of Converters**

Most practical topologies require an energy storage element, which also decouples the input and the output side converters Electrónica de Potência © 2008 Jose Bastos Chapter 1 Introduction

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**Uninterruptable power supply - UPS**

220 V 220 V ~ Batt 24V load Converter 1 rectifies line-frequency ac into dc Capacitor acts as a filter; stores energy; decouples Converter 2 synthesizes line-frequency ac to load Electrónica de Potência © 2008 Jose Bastos Chapter 1 Introduction

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**Power Flow through Converters**

Converter is a general term An ac/dc converter is shown here Rectifier Mode of operation when power from ac to dc Inverter Mode of operation when power from ac to dc Electrónica de Potência © 2008 Jose Bastos Chapter 1 Introduction

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**Scope and Applications**

Electrónica de Potência © 2008 Jose Bastos Chapter 1 Introduction

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**Interdisciplinary Nature of Power Electronics**

Electrónica de Potência © 2008 Jose Bastos Chapter 1 Introduction

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