In post 1 you mentioned the primary wire 10 strand, 0,31mmq, so squared.
But actually it is equivalent to 0,31 mm diameter single strand copper?
Or has your litz wire an outer diameter of 0,31 mm?
I am working on it, don't worry.
But, I repeat, the spec you wrote are out of the contest and someone told this you many post ago.
Do you remember?
Walter
But, I repeat, the spec you wrote are out of the contest and someone told this you many post ago.
Do you remember?
Walter
What do you mean by simplest partitioning? The number of windings depends on the turns, insulators, size such that a target leakage inductance is achieved (or better a target leakage inductance and stray capacitance are achieved). Then using multiple layers in parallel made of smaller wire might help to stay within or just above the critical diameter. However you also put more insulator in it and thus DC resitance increases. You need to find a balance every time for every trnasformer. They are not all the same. In fact some famous European transformers that all use the same scheme for different models do have different performance...some are good and some are quite poor.
Wires, bobbins, DC resistance... all transformer parameters can grow and shrink accordingly... as a renowned winder you must already know this... 😛😀
""" Your money, your thread, your transformer, your test... """
My tests, it is sure, not yours.
You can help this thread if you send some practical job you did around the trafos
Walter
My tests, it is sure, not yours.
You can help this thread if you send some practical job you did around the trafos
Walter
Walter please check post 204 and confirm the real data of the primary litz wire.
Your V51 cores (double) have less than 12 cm² core area; winding space is 22 mm high and 62 mm wide, which actually is less because of the bobbin.
Marginal for 300B/KT88; I'd prefer some more Afe.
Your V51 cores (double) have less than 12 cm² core area; winding space is 22 mm high and 62 mm wide, which actually is less because of the bobbin.
Marginal for 300B/KT88; I'd prefer some more Afe.
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I used Litzendraht wire in RF on my childhood, now I am poor enough to do not waste my money in the wrong things... so no Litzendraht trafo to show here...
If you look on the lasts test I sent you can see that at 8 watt the problem are around the low frequencies; aren't too bad but must be better.
At 1 watt are better, but this is not the problem, of course.
And it is similar to the test done with the test set I presented (using the secondary winding)
With a KT150 with more current but lower Rp the situation is little bit better.
The performance at high frequency are good, in my opinion also the THd vs Freq.
As told many time here, I am looking to have a much better performance on low frequency.
In next 20 days, I hope, I will have a X double C core s.e. trafo with an higher L to reach almost the 20H , always with Litz
Walter
At 1 watt are better, but this is not the problem, of course.
And it is similar to the test done with the test set I presented (using the secondary winding)
With a KT150 with more current but lower Rp the situation is little bit better.
The performance at high frequency are good, in my opinion also the THd vs Freq.
As told many time here, I am looking to have a much better performance on low frequency.
In next 20 days, I hope, I will have a X double C core s.e. trafo with an higher L to reach almost the 20H , always with Litz
Walter
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""" so no Litzendraht trafo to show here..."
is not a problem.
You can send the test of your normal trafo that are surely at high level, I think that the performance are equivalent or (maybe) better than the ones I have sent.
Thx
Walter
is not a problem.
You can send the test of your normal trafo that are surely at high level, I think that the performance are equivalent or (maybe) better than the ones I have sent.
Thx
Walter
Walter...Walter... your numbers does not match... again...
For 0.31mm magnet wire and your alleged core, calculations show
Rp ~ 110Ω
For the Litzendraht wire one should expect more...
That´s what those with hidden agendas, who can´t handle basic Physics and Math, say about those who can 😉
You have not refuted a single calculation 🙄 ... I wonder why.
Not only that, instead you misquoted a dead guy who if alive would have said "huh????? .... I didn´t say THAT!!!! " and then instead of Mathematical proof you tried to hide behind the "principle of Authority" a classic logical fallacy.
https://en.wikipedia.org/wiki/Argument_from_authority
Not only that, it is you who is making a statement which needs proof "Litz wire is better" so *you* must prove it, yet you use another classic logical fallacy: reversal of burden of proof: instead of you proving your statment , instead you hide by asking Popilin proof of HIS transformers, which are not in discussion here.
So you already committed 2 logical sins trying to impose your ideas .... I´m waiting for the third 😉
Just as a side comment, being Italian you should understand this Classic phrase without even needing a translation .... at least I do 😉
Onus probandi incumbit ei qui dicit, non ei qui negat
for non Latin/Romance language readers:
The burden of proof rests upon the person who says it is (so), not (on) he who denies it.
EDIT: sorry, I mixed you with the OP ; so I must split my answer: the "intolerable" bit comes from you, the rest addresses some very poor ways which have been used trying to disqualify popilin.
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"Ladran Sancho, señal que cabalgamos"
"They bark Sancho, signal that we ride"
Miguel de Cervantes Saavedra?...No... Johann Wolfgang von Goethe 😀
He said that while tried to find Litzendraht wire...
"They bark Sancho, signal that we ride"
Miguel de Cervantes Saavedra?...No... Johann Wolfgang von Goethe 😀
He said that while tried to find Litzendraht wire...
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Core V51 is equivalent to SG 89/51, which has average winding length of 23,7 cm / turn.
1784 x 0,237 = 422,8 meters.
422,8 meters of 0,315 mm diameter copper wire has 92,7 ohm resistance. Wowww!
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I've read that Russian article. It says that skin effect depth at 200 kHz is 0.2 mm. That is, at this frequency, skin effect will affect wire resistance only if its diameter is more than 0.4 mm.
In my database, core V51 has an average turn length of 26cm, then
Rp = ρ lm Np / A ≈ 106 Ω
Taking into account the wire tension and hence a little stretching we can round it to
Rp ~ 110 Ω 😎
Considerably less than Litzendraht wire.
If you do not like the number, I can looking for another core which does match...
We can also cheat with copper resistivity, or make a correction for rounded corners on the windings... the menu is ample... 😀
Yes, that is the idea, I did the calculation on post#41
δ ≈ 0.21 mm @ 100 KHz
Anyway people are eager of miracle recipes, neither science nor knowledge will stop them and this will be an endless thread without any conclusion.
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Who is the supplier of these cores? So I get some and wind a couple for the test bench...waltube said:
Interesting mode, I have to test that mode but with lower voltage... what about 50VDC/60VDC as primary voltage? I do not wanna work with higher voltages.waltube said:
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