Isolated dc-dc Converters
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projectsofme
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Posts: 1,124
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#1
04-10-2010, 08:55 AM


This article is presented by:

Yrd.Doç.Dr.Mutlu Boztepe


Transformer isolation

Objectives:
• Isolation of input and output ground connections, to meet
safety requirements
• Reduction of transformer size by incorporating high
frequency isolation transformer inside converter
• Minimization of current and voltage stresses when a
large step-up or step-down conversion ratio is needed —
use transformer turns ratio
• Obtain multiple output voltages via multiple transformer
secondary windings and multiple converter secondary
circuits


The magnetizing inductance LM

Models magnetization of
transformer core material
• Appears effectively in parallel with
windings
• If all secondary windings are
disconnected, then primary winding
behaves as an inductor, equal to the
magnetizing inductance
• At dc: magnetizing inductance tends
to short-circuit. Transformers cannot
pass dc voltages
• Transformer saturates when
magnetizing current iM is too large

For more information about this article,please follow the link:
googleurl?sa=t&source=web&cd=3&ved=0CBwQFjAC&url=http%3A%2F%2Felectronics.ege.edu.tr%2Fboztepe%2Fcgi-bin%2Fload.cgi%3Fee544Lecture4.ppt&ei=OUipTKYnw7vyBqL-1NUM&usg=AFQjCNGTstyvovCXkpL7C21v6fCs39Wk1g.
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projectsofme
Active In SP
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Posts: 1,124
Joined: Jun 2010
#2
15-10-2010, 01:26 PM


.ppt   PPT final.ppt (Size: 704 KB / Downloads: 84)
This article is presented by:
Chinchu George
DC TO DC CONVERTER WITH CONTROLLED ACTIVE CLAMPING SYSTEM


Introduction

Dc To Dc Converter is necessary to couple the solar cells operating at low DC Voltage to the inverters Dc links

Solar converters should have high efficiency

Solar converters can handle different voltages without loss

Need of The Study


Present converters have large size
They have reduced switching frequency
Low efficiency
Paralleling of several converter stages is necessary due to its current source characteristics


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