04-10-2010, 08:55 AM
This article is presented by:
Yrd.Doç.Dr.Mutlu Boztepe
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
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
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
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