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You say you measured it. What's the result?I put the ungapped ETD39 core halves into the bobbin and measure the leakage inductance.
Now I do the same again, but this time with a 0.2mm centre leg gapped ETD39 core.
Sorry I haven't yet got clearance to buy these cores...I havent actually measured it, I was just kind of putting the question in an abbreviated way.You say you measured it. What's the result?
I put the ungapped ETD39 core halves into the bobbin and measure the leakage inductance.
Now I do the same again, but this time with a 0.2mm centre leg gapped ETD39 core.
New topic?shows that the leakage inductance increases with the square of the number of primary turns. Again, do you believe that this is true for NON-section wound transformers aswell?
What surprises me is that the leakage increases as with the square of the turns.Obviously it is, if winding geometry doesn't change otherwise.
Drive the circuit with high amplitude square waves, like 30v peak to peak at 100 Khz. If the 1:1 transformer is "perfect" there should be nothing to see on the output. Any leakage inductance or imbalance
Square wave at 100kHz contains lots and lots of harmonics and that makes interpretation of the results difficult. If you do the same experiment with sine wave, the results will be much more cleaner. Ringing is always due to bandwidth limitations. See, for example, https://en.wikipedia.org/wiki/Gibbs_phenomenon and cannot be correlated with leakage inductance.
Yes indeed, and the ringing I was seeing was at around 1.9 Mhz, with 100 Khz drive.
I have often wondered about the wisdom of gapping the centre limb of a transformer, and then winding right over the top of the gap.
Its an easy enough experiment for anyone here to try for themselves.
I doubt if gap size really has any effect on leakage inductance unless the winding surrounds the gap. If it does, you may be in trouble.What is the relationship between leakage inductance and core gap size?
Leakage inductance of a regular transformer (including interleaved winding design) is (in a first order) an air core inductance. It's only weakly influenced by core permeability and air gaps.
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