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Chapter 1 Power Electronic Systems

Chapter 1 Power Electronic Systems. Introduction Power Electronics versus Linear Electronics Applications. Power Electronic Systems. Block diagram Role of Power Electronics Reasons for growth. Linear Power Supply. Series transistor as an adjustable resistor Low Efficiency

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Chapter 1 Power Electronic Systems

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  1. Chapter 1 Power Electronic Systems • Introduction • Power Electronics versus Linear Electronics • Applications Chapter 1 Introduction

  2. Power Electronic Systems • Block diagram • Role of Power Electronics • Reasons for growth Chapter 1 Introduction

  3. Linear Power Supply • Series transistor as an adjustable resistor • Low Efficiency • Heavy and bulky Chapter 1 Introduction

  4. Introduction: Switching Power Electronics Linear regulator Goal: control VX such that Vo=Vo,REF Plus: simple accurate, high-bandwidth Minus: low efficiency  Chapter 1 Introduction

  5. Switching power converters Vo(t) VIN <Vo> Add filtering Vo(t) VIN <Vo> Add real devices • Note: • only lossless elements • L, C energy storage Chapter 1 Introduction

  6. Switch-Mode Power Supply • Transistor as a switch • High Efficiency • High-Frequency Transformer Chapter 1 Introduction

  7. Basic Principle of Switch-Mode Synthesis • Constant switching frequency • pulse width controls the average • L-C filters the ripple Chapter 1 Introduction

  8. 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 Chapter 1 Introduction

  9. 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 Chapter 1 Introduction

  10. 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 Chapter 1 Introduction

  11. 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 Chapter 1 Introduction

  12. Scope and Applications Chapter 1 Introduction

  13. Interdisciplinary Nature of Power Electronics Chapter 1 Introduction

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