wind ferrite transformer

How to Wind the ferrite transformer

By: Alok Kumar


 

The ferrite transformer is wound over a 15mm EE ferrite core compatible plastic bobbin. 
The one half primary is wound first, using a 0.4mm super enamelled copper wire (15 turns).
 Secure the end of this on one of the primary side pins of the bobbin. Cover the winding with a layer of insulation tape.
Next wind the secondary winding (5 turns) using 0.6mm wire over it.
Terminate the ends on the secondary pins of the bobbin.
Apply insulation tape over this winding.
On this wind 3 turns of 0.4mm auxiliary winding, cover it with insulation tape.
Finally continue from the secured end of the first primary winding and wind 15 more turns over the above auxiliary wind to finish of the ferrite transformer coils.
Put a few layers of insulation tape to finalise the winding insulation.
Fix the EE cores and tape it yet again along its periphery.
Make sure the EE core edges are separated with an air gap through a piece of insulation tape or a paper, this will prevent core saturation and stalling of the desired SMPS induction.