Lecture 3 - EEL 5245: Power Electronics I Lecture Notes 3:...

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EEL 5245: Power Electronics I Lecture Notes 3: Non-Isolated Dc-dc Converters School of Electrical Engineering and Computer Science University of Central Florida
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2 The Buck Converter Switching frequency anywhere from 20kHz to 100MHz nowadays! Lower switch can usually be just replaced by a diode Very popular circuit for many applications Voltage step-down converter
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3 Buck Analysis Mode 1: S is turned on
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4 Mode 2: S is turned off
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5 Buck Converter Analysis :Waveforms Inductor Voltage and Current -Vo Vin-Vo Vin-Vo -Vo
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6 Converter analysis Principle Volt-Second Balance gives Voltage Gain ,M Vin-Vo -Vo (-Vo) (D’Ts) (Vin-Vo)(DTs) (Vin-Vo)(DTs) + (-Vo) (D’Ts) Vo 0=DVin - (D+D’)Vo = DVin-Vo Vo=DVin
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7 Volt – Second Principle Average voltage across inductor = 0 (in steady state)
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8 Buck Converter Analysis Concept of DC Transformer
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9 Output current minus half the current ripple Output current plus half the current ripple min 2 Lo I II =− max 2 I
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Lecture 3 - EEL 5245: Power Electronics I Lecture Notes 3:...

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