Lecture 14 forward converter

Lecture 14 forward converter - Lecture 14 Forward converter...

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1 Lecture 14 Forward converter – Analysis and design • Introducing transformer isolation in buck converter • Forward converter • Principle of operation and waveforms EEE 498/591 – Raja Ayyanar
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2 Introducing isolation in a buck converter • Large conversion ratios require transformer isolation + Required: Mechanism for flux continuity and volt-second balance (core resetting); several schemes possible in V in nV o V o V EEE 498/591 – Raja Ayyanar
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3 Forward converter • When S 1 is turned off, D R conducts current in reset winding • Energy stored in magnetizing inductance is fed back to source • Primary and secondary are main power windings; reset winding is rated for very low current and occupies little space • On the secondary side, operation is very similar to buck + pri v in V 1:1: n o V sec v Reset winding 1 S R D L i rect v reset i sec i pri i EEE 498/591 – Raja Ayyanar
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4 Forward converter - waveforms ON Interval OFF Interval core being reset OFF Interval
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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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Lecture 14 forward converter - Lecture 14 Forward converter...

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