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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 • Introduction • Power Electronics versus Linear Electronics • Applications Chapter 1 Introduction
Power Electronic Systems • Block diagram • Role of Power Electronics • Reasons for growth Chapter 1 Introduction
Linear Power Supply • Series transistor as an adjustable resistor • Low Efficiency • Heavy and bulky Chapter 1 Introduction
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
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
Switch-Mode Power Supply • Transistor as a switch • High Efficiency • High-Frequency Transformer Chapter 1 Introduction
Basic Principle of Switch-Mode Synthesis • Constant switching frequency • pulse width controls the average • L-C filters the ripple Chapter 1 Introduction
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
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
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
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
Scope and Applications Chapter 1 Introduction
Interdisciplinary Nature of Power Electronics Chapter 1 Introduction