[SOLVED] why we use coupled inductor?

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Musharraf wajahat

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Why we use coupled inductor in any electronics circuit like capacitor stores charge etc
i mean i know what is an inductor and its behavior but why we use coupled inductor ?
 

A coupled inductor is a transformer. It is used for converting power from one impedance to another or one voltage to another.

Keith
 

yeah it is just like a transformer but what is its role when there are equal no of turns on both sides, here i am uploading the picture of the circuit this is actually from a paper known as "a novel bidirectional dc to dc converter with battery protection"
https://obrazki.elektroda.pl/7321076800_1356546685.png
since there are equal no of turns of primary and secondary winding what is the role of coupled inductor in this circuit?
 

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