Lecture 12 dc dc with transformer isolation

Lecture 12 dc dc with transformer isolation - Lecture 12...

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1 Lecture 12 Transformer isolation in dc-dc converters • Need for transformer isolation • Review of basics of magnetics • Transformer models • Basic requirements for valid steady state operation • Examples EEE 498/591 – Raja Ayyanar
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2 Need for transformer isolation • Many applications require electrical isolation for safety; required by regulatory agencies • Better switch utilization and filter optimization when large conversion ratios are involved; - higher efficiency and power density • Very easy to obtain multiple outputs at different voltage levels • Bulky, expensive component • Leakage inductance and winding capacitance Disadvantages EEE 498/591 – Raja Ayyanar
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3 Example: Application with large step down ratio + L S 1 D 1 I o + _ V o V in V in = 200V V o = 2V I o = 10A P o = 20W f S = 200 kHz VA rating of switch = V in I o = 2000VA ( ) 93 2 1000 100 10 200 10 20 in o on off s VI Switching loss t t f W - =+ ´ ´ ´ = ( ) 1 2 and 200 oS VD T LD I - == D • With isolated topology, all the above values will be significantly smaller
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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 12 dc dc with transformer isolation - Lecture 12...

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