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Unit V

The document discusses coupled circuits, which involve magnetic coupling between elements, exemplified by transformers with primary and secondary windings. It explains self-induced EMF, where a changing current in a coil induces an opposing EMF, and mutual induced EMF, where the flux from one coil induces EMF in another linked coil. The concept of coupled coils is highlighted, emphasizing the reversible nature of mutual induction.

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23 views19 pages

Unit V

The document discusses coupled circuits, which involve magnetic coupling between elements, exemplified by transformers with primary and secondary windings. It explains self-induced EMF, where a changing current in a coil induces an opposing EMF, and mutual induced EMF, where the flux from one coil induces EMF in another linked coil. The concept of coupled coils is highlighted, emphasizing the reversible nature of mutual induction.

Uploaded by

ShanilDayalan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PPTX, PDF, TXT or read online on Scribd
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Unit V

Coupled Circuits and Topology


Coupled Circuits
• Coupled circuits refer to circuits involving elements with magnetic coupling.

• If the flux produced by an element of a circuit links (or pass through) other elements of the same

circuit or a nearby circuit then the elements are said to have magnetic coupling

• In magnetically coupled elements, the power (or energy) transfer occurs through the magnetic

flux. In conductively coupled elements, the power (or energy) transfer takes place through the

current

• A transformer is the best example of a coupled circuit. A transformer consists of two coils

wound on a common core. The two coils are electrically isolated but linked magnetically. The two

coils are called primary winding and secondary winding


Self induced EMF
• Whenever current passes through a coil flux is set up in the coil.

• If the current is varying then the flux will also follow the variations in the current.

• Due to change in flux, an emf will be induced in the coil.

• The direction of the induced emf will be such as to oppose the current through the

coil. This emf is called self-induced emf


Mutual induced EMF
• When a circuit has two or more coils then there is a possibility that the flux produced by one coil

links the other coils.

• If the flux produced by coil-1 of a circuit links (or pass through) coil-2 of the circuit then an emf is

induced in coil-2 due to change in flux (or current) in coil-1. This emf is called mutual induced emf .

• The term mutual is used here for induced emf because the action is reversible, i.e., if the flux

produced by coil-2 links coil-1 then a change in flux in coil-2 will induce an emf in coil-1.

• The two coils linked by magnetic flux are called coupled coils.
Statement of Dot Rule
Linear Transformer

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