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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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