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Winding Techniques for Switch mode Transformers

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khatus:
Hello guys i want to know the Winding Techniques for Switch mode Transformers.I have watched few video in you tube but can not understand how to implement the phase opposition in real hardware(i.e in transformers).

Jwillis:
The winding techniques or methods are the same for any transformer.The only difference is with increasing frequency the fewer the windings and the smaller the core can be.This all has to be calculated based on  the parameters you require . Size , voltage, current  and the material of the core.This determines at what frequency you can operate the transformer. 
The direction of your secondary in relation to the primary makes no difference provide that all secondary windings are in the same direction to each other.

MagicSmoker:

--- Quote from: khatus on August 22, 2019, 11:05:00 pm ---Hello guys i want to know the Winding Techniques for Switch mode Transformers.I have watched few video in you tube but can not understand how to implement the phase opposition in real hardware(i.e in transformers).

--- End quote ---

The dot is traditionally interpreted as the start of the winding, simple as that. See, for example, this explanation:

https://www.electricaltechnology.org/2013/12/transformer-phasing-the-dot-notation-and-dot-convention.html

That said, the image you linked to shows a flyback converter, in which the transformer operates a bit differently. In all transformers, when the dot end of the primary is positive so will the dot end on all of the secondaries (and when the dot end is negative, etc...). Apply that rule to the flyback and you'll see that when the primary switch turns on current flows into the non-dot end of that winding which means the dot end will be negative, and the secondary dot end will also go negative but the series diode prevents current from flowing at that time. When the primary switch turns off the polarity of all windings will flip and now the dot ends are positive so current can flow out of the secondary. This means energy was stored in the core by the primary when the switch turned on, and transferred out of the core by the secondary and diode when the switch turned off. In a conventional transformer the goal is to store as little energy as possible in the core, but in a flyback transformer the goal is the opposite, but this radical difference in goals typically only requires adding an air gap to the core of the flyback transformer.

Hopefully that explanation isn't too deep in the weeds...

khatus:
I want to know about how to implement in real hardware.How to wind a transformer that its primary and secondary are in phase opposition?
I have watched a video about it but since the owner of the video is an Indonesian i can not understand his words?
https://youtu.be/-OUaMWKzDcc?t=34
How to implement interleaved winding in flyback transformer(i.e on bare frame we place half of the primary winding and then secondary winding entirely and over it the second half of the primary)




MagicSmoker:

--- Quote from: khatus on August 23, 2019, 12:25:54 pm ---I want to know about how to implement in real hardware.How to wind a transformer that its primary and secondary are in phase opposition?

--- End quote ---

And I already answered you in sufficient detail - along with the links and pics that are also in this thread - for you to get on with winding a transformer yourself.

Wind all windings in the same direction and treat the start as the dot end. For a flyback transformer, connect the start of the primary to the positive power rail and the end to the switch, and connect the end of the secondary to the anode of the output diode and the start to output ground (assuming a positive output voltage). If you want to interleave the primary and secondary then first wind half of the primary, then the entire secondary, then the other half of the primary, and join the end of the first primary to the start of the second.

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