Energy transfer in Baluns
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- เผยแพร่เมื่อ 13 ต.ค. 2023
- #205 In this video on the topic of baluns, I look at the 2 main principles on which the energy gets transferred between the windings - on the one hand you have magnetic coupling and on another you have transmission line coupling. Now, other than these 2 separate methods, there is a third intermediate one - both methods at the same time.
Balun series:
Ep1 - Communication lines and baluns • Communication lines an...
Ep2 - Voltage and Current baluns • Voltage and Current Ba...
Ep3 - Energy coupling • Energy transfer in Baluns
Ep4 - Transmission line baluns • Transmission-Line Baluns
Ep5 - Transmission line experiments: • Experiments with Trans...
Ep6 - The Ruthroff Transformer: • The Ruthroff Impedance...
Ep7 - The Guanella Transformers: • Analyzing Guanella Imp...
EP8 - LC baluns: • Building INDUCTOR-CAPA...
Datasheet:
fair-rite.com/52-material-dat...
Further reading:
eng.libretexts.org/Bookshelve...
Transmission Line Transformers; Jerry Sevick; Noble Publishing 2001
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This is fantastic. I have learned more from Fesz on TLT's than reading Jerry Sevick's entire book on the subject.
Hi FesZ, I couldn't resist checking out your latest video, and it was really great, I got a lot of of it. Thank you.
Paul Pr
Great video! Always wondered how these black magic magnetic devices worked. Great explanation! Thank you!
Brilliant explanation!
Any chance of covering wideband binocular core coaxial TLTs? Particularly for impedance conversion, like in RF transistor input/output matching?
+1
Thank you these videos are really helpfull !
Thank You. Now I understand UN-UN's or BALUN's for HAM radio antennas substantially better.
Another great video.
Thank you for explaining transmission transformers so well, and showing the frequency sweeps. I more clearly understand the principles you demonstrated than I did after building many dozens of transformers for amateur RF applications to explore efficient broadband designs. I will say I began toying with twisted windings and the twist rate to effect characteristic impedance, and I definitely found out about the efficiency benefits of limiting space between wire and core.
Great explanation, thanks!
Brilliant ❤ 👍
thanks, very informatics vedio!
👍👍👍 Thanks !
спасибо друг! Твое видео было полезно!
Genius.
I love baluns.
This is an excellent explanation, thank you! I often see baluns which appear to be constructed as common mode chokes (Guanella baluns). These baluns seem to have bandwidths that exceed the flat region of the real permeability - for instance in a material 61 Guanella balun that has a rated bandwidth of 1 - 55 MHz, while material 61's real permeability begins to decrease at about 2 MHz. How do Guanella baluns compare to the transmission line transformers discussed in the video? Do the work on the same operating principal?
Would you be interested in making a video on measuring real and complex permeability?
NanoVNA saver (the program used to show the transfer curve of the transformer) can help with that
@@rjordans we only get r + jwl graphs vs freq, how can we get complex permeability graphs, we have to input no of turns, ferrite sizes for that?
Yes, in the latest version you have a plot for permeability. You can configure the core parameters by right clicking on the graph and setting them through the context menu
It it the fisrt time I see a complete explanation of why we use a twisted pair (or trifilar) winding on a core transformer.
Thank you so much !
One question now : If I look at my HF power amplifier, it seems to work also with a (low impedance) coaxial line winding. Correct ?
I am still puzzled by the magnetic coupling between inner and outer core in that case.
Thanks for the nice videos! How could this type of windings could be used with other than 1:1 turns ratio?
You can use 3 or more wires twisted together - to have multifilar coils; and then the ends are inter-soldered, depending on the transformer you need. I'm not sure though if more than 4 wires are ever used in parallel; at some point you will be using multiple transformers interconnected for other ratios.
@@FesZElectronics quadrifilar transformers are sometimes used. Practically, it gets annoying to wrap them, though.
Nikola Tesla actually patented a design for an electromagnet using bifilar windings, “capable of neutralizing its self-induction”. It was a critical discovery at the time on the path to greater efficiency coils.
Wait! is this how Baluns is pronounced?!
No clue... I heard multiple ways of saying it...
IMO, in English, we should take the first syllable from "balanced", which is a soft 'a', and the first syllable of "unbalanced" (a soft 'u'), and put them together. It's kind of like a portmanteau, and normal practice is to keep the syllables intact. Hence, "balun" with a soft 'a' and a soft 'u'.
The way @FesZElectronics is pronouncing it is less common, but not strictly UNcommon, per se :-). I've also heard people pronounce it with a long 'u', basically sounding like the word 'balloon'.
But I think the portmanteau aspect is pretty compelling.