472 Lecture 3 Buck converter

472 Lecture 3 Buck converter - Lecture 3 Steady state...

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Lecture 3 Steady state analysis of buck converter • Buck converter – basic operation • Steady state analysis / waveforms • Selection of switches, L and C EEE 498/591 – Raja Ayyanar
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Non-isolated dc-dc converters ~ PPU PPU PPU PPU 110V 1 phase 5V/20A 2V/60A 12V/2A Typical distributed power supply 24 V dc Example applications Point of load converters for processors + - 1.5V cell + - 5V or 9V electronic load Boost converter Boost converter for Battery operated device •V o needs to be regulated precisely against wide variations in the input voltage and load • Power flow is usually uni-directional EEE 498/591 – Raja Ayyanar
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Non-isolated dc-dc converters • Step down or buck converter • Step up or boost converter • Buck boost converter Cuk converter (briefly) • SEPIC converter (briefly) EEE 498/591 – Raja Ayyanar
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Bi-positional switch implementation 1 2 A i A ( t ) + _ V in + _ v A ( t ) For bi-directional i A i A ( t ) + _ v A ( t ) 1 2 A + _ V in uni-directional i A i A ( t ) > 0 uni-directional power flow • Power MOSFETs or IGBTs, and power diodes EEE 498/591 – Raja Ayyanar
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Real switches vs. ideal switches • finite current and voltage ratings • voltage drop in the on state - conduction loss • finite rise time, fall time - switching loss • energy loss in drive circuitry • reverse conduction • maximum power loss, limits on temperature rise • spurious turn on / off For all our initial analysis we will assume ideal switches EEE 498/591 – Raja Ayyanar
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This note was uploaded on 05/25/2011 for the course EE 472 taught by Professor Ayynar during the Spring '11 term at ASU.

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472 Lecture 3 Buck converter - Lecture 3 Steady state...

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