Isolated dc-dc Converters

[kingofring_131@]

This article is presented by:

Yrd.Do .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

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[aswin p ramesh]

[attachment=6152]

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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