472 Lecture 8a Average model contd

472 Lecture 8a Average model contd - Lecture 8a Average...

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Lecture 8a 1 Lecture 8a Average (CCA), large-signal model of dc-dc converters • Average model of converters • Transient simulation using switching model and average model EEE 498/591 – Raja Ayyanar
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Lecture 8a 2 Average model of the building block • switching pole (building block) is modeled as an ideal transformer with turns ratio equal to instantaneous duty ratio • Only a mathematical model; cannot apply dc to real transformer; turns-ratio needs to vary dynamically d () vp vt cp cp it vp + _ + _ vp + _ vp cp cp + _ 1 :d d EEE 498/591 – Raja Ayyanar
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Lecture 8a 3 Average model in steady state analysis + oc p i n o in Vv D V V D V  D + V o _ + V in D i L + i L Buck-boost Buck 1:D cp v + _ _ + V in V o D:1 i L cp v + _ vp v + _ _ V o + + _ V in   1 p o i n o in D V V V D VD  EEE 498/591 – Raja Ayyanar
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Lecture 8a 4 Average model in steady state analysis + D 1-D _ V o + V in V in vp v + _ cp v + _ _ V o + i L i L ( 1-D ) :1  1 1 1 o in cp o in V Vv D V VD  Boost + _ v Cc + V in _ V o + + vp v + _ + _ cp v 1 C Co i n oc p o i n o
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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 8a Average model contd - Lecture 8a Average...

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