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Ch1slides(updated)

Ch1slides(updated) - Fundamentals of Power Electronics...

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Fundamentals of Power Electronics Chapter 1: Introduction 1 Fundamentals of Power Electronics Second edition Robert W. Erickson Dragan Maksimovic University of Colorado, Boulder
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Fundamentals of Power Electronics Chapter 1: Introduction 2 Chapter 1: Introduction 1.1. Introduction to power processing 1.2. Some applications of power electronics 1.3. Elements of power electronics Summary of the course
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Fundamentals of Power Electronics Chapter 1: Introduction 3 1.1 Introduction to Power Processing Dc-dc conversion: Change and control voltage magnitude Ac-dc rectification: Possibly control dc voltage, ac current Dc-ac inversion: Produce sinusoid of controllable magnitude and frequency Ac-ac cycloconversion: Change and control voltage magnitude and frequency Switching converter Power input Power output Control input
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Fundamentals of Power Electronics Chapter 1: Introduction 4 Control is invariably required Switching converter Power input Power output Control input Controller reference feedback feedforward
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Fundamentals of Power Electronics Chapter 1: Introduction 5 High efficiency is essential High efficiency leads to low power loss within converter Small size and reliable operation is then feasible Efficiency is a good measure of converter performance 0 0.5 1 1.5 0.2 0.4 0.6 0.8 1 P loss / P out η η = P out P in P loss = P in P out = P out 1 η – 1
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Fundamentals of Power Electronics Chapter 1: Introduction 6 A high-efficiency converter A goal of current converter technology is to construct converters of small size and weight, which process substantial power at high efficiency Converter P in P out
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Fundamentals of Power Electronics Chapter 1: Introduction 7 Devices available to the circuit designer DT s T s Resistors Capacitors Magnetics Semiconductor devices Linear- mode + Switched-mode
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Fundamentals of Power Electronics Chapter 1: Introduction 8 Devices available to the circuit designer Signal processing: avoid magnetics DT s T s Resistors Capacitors Magnetics Semiconductor devices Linear- mode + Switched-mode
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Fundamentals of Power Electronics Chapter 1: Introduction 9 Devices available to the circuit designer Power processing: avoid lossy elements DT s T s Resistors Capacitors Magnetics Semiconductor devices Linear- mode + Switched-mode
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Fundamentals of Power Electronics Chapter 1: Introduction 10 Power loss in an ideal switch Switch closed: v ( t ) = 0 Switch open: i ( t ) = 0 In either event: p ( t ) = v ( t ) i ( t ) = 0 Ideal switch consumes zero power + v(t) i(t)
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Fundamentals of Power Electronics Chapter 1: Introduction 11 A simple dc-dc converter example Input source: 100V Output load: 50V, 10A, 500W How can this converter be realized?
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