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Help with Pulse Transformer Design

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T3sl4co1l:
Okay, what are you really doing first of all?  Because you literally gave no numbers in your post, nor a description of the figures; and we can design transformers all day and all night but only if we have numbers to put in!

Tim

tautech:

--- Quote from: T3sl4co1l on August 22, 2019, 09:31:09 pm ---Okay, what are you really doing first of all?  Because you literally gave no numbers in your post, nor a description of the figures; and we can design transformers all day and all night but only if we have numbers to put in!

Tim

--- End quote ---
Yep.

For the OP, the first 2 hits from Google on 'smps transformer design'
https://wcmagnetics.com/wp-content/uploads/2015/02/appnote11.28.10.pdf
https://talema.com/smps-transformer-design

KurtK:

--- Quote from: T3sl4co1l on August 22, 2019, 09:31:09 pm ---Okay, what are you really doing first of all? 
--- End quote ---

Let me address your question first, so there is no doubt about what I really want to do:

I want to step-down what present it self on the primary side in the most efficient way possible, that is within my means.


--- Quote from: T3sl4co1l on August 22, 2019, 09:31:09 pm ---Because you literally gave no numbers in your post, nor a description of the figures
--- End quote ---

The first figure is the circuit at hand with my transformer in the middle. The second is a graph of measurement traces of current and voltage on primary and secondary side and there is a legend in the top right corner so that the traces can be distinguished from each other.


--- Quote from: T3sl4co1l on August 22, 2019, 09:31:09 pm ---and we can design transformers all day and all night but only if we have numbers to put in!
--- End quote ---

Well, so can I, but in this case I don't have all the numbers and I neither can I obtain all the numbers that would fit nicely in a plug-n-play formula. There is a degree of uncertainly due to unobtainable numbers and information, and I personally don't mind that, it's workable for me. 

 

KurtK:

--- Quote from: MagicSmoker on August 22, 2019, 09:21:14 pm ---No, that gives you apparent power as I keep saying. You need to adjust for any phase angle displacement of current with respect to voltage to get true power.
--- End quote ---

I know you keep saying that, but I still don't understand it. By "instantaneous" I mean "in that given instant" and since the traces in graph are made up of samples at a given instant, I can multiply voltage with current at a given instant and obtain power at a given instant. I do not have to adjust the product of voltage and current for phase displacement because it is already present at that given instant. That is what I think, but I could obviously be wrong.


--- Quote from: MagicSmoker on August 22, 2019, 09:21:14 pm ---This applies whether the transformer is driven by a sine wave from the mains or a square wave from an H-bridge.
--- End quote ---

And in this case the transformer is driven by a exponential decaying pulse.


--- Quote from: MagicSmoker on August 22, 2019, 09:21:14 pm ---It is immensely frustrating when the OP does not include important details... like that the secondary is high voltage or the average power rating is 50kW.
--- End quote ---

I sure sense your frustration all the way across the pond. If you look at the graph in my OP you can see the voltages and currents involved. And I couldn't very well calculate average power before I there were some agreement to how it should be done.

Also to get to the bottom of something you need to have a dialogue, just like we have now. I can't just present a massive wall of information to being with, that would be highly confusing for the reader as most of it would probably be irrelevant for this topic.


--- Quote from: MagicSmoker on August 22, 2019, 09:21:14 pm ---No offense - seriously - but if you need a 50kW high voltage transformer then there is no shame in getting it designed for you by a company that specializes in magnetic component design and manufacturing like, say, Spang, which is a division of the US business, Magnetics, Inc.

--- End quote ---

If it was only a question of shame, I would certainly do that, in fact I would outsource everything.

KurtK:

--- Quote from: tautech on August 22, 2019, 10:08:14 pm ---For the OP, the first 2 hits from Google on 'smps transformer design'
--- End quote ---

Thank you very much for googling that one for me. But as you can see in thread, MagicSmoker and I agreed to call it "SMPS transformer" because that was what MagicSmoker felt was the most appropriate term and I didn't mind that. But that does not infer that I'm building a SMPS although it may have some elements of a SMPS. As I told MagicSmoker I would have preferred to call it a "step-down transformer", but then probably some helpful soul would google 50HZ sine AC transformer design for me, and I really wanted to avoid that.

I get the distinct feeling that this post is starting to go sideways, so maybe I should just bow out now and thank all for their kind help so far, what do you think? Would that be a wise decision of me?

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