T
Which current is meaned with "of this"?Thanks, obviously common mode chokes don't saturate with the differential mode current, (since the fields of each coil cancel each other out) ..however, they will saturate on the magnetising current of this....eventually. When saturated, the leakage inductance will also drop to around zero.......what, do you believe is the differential current that will saturate this common mode choke?............
The inductance of the equivalent air core inductor couldn't possibly be up to 25% of the coil-on-core inductance..the leakage inductance won't drop much because it's almost equal to the inductance of the respective air-core inductor.
...yes, theoretically ideal...but in reality , as you know, there is a magnetising current, this will saturate the core....I am not talking about common mode current, I am talking about "Magnetising current"Theoretically the currents in both coils are always equal and in opposite direction so the core never saturates.
When saturated, the leakage inductance will also drop to around zero
thanks, and we are interested in whether or not the above choke (#1) saturates at the 5 amp peaks of the mains input current? (saturation due to magnetising current). We all accept that such a choke has a magnetising current.
nope, for a differential current only a few tens of mA is needed to saturate a high mu core.is rated for 2.2A so anything over this will be called saturation
Your post shows little understanding of magnetic circuits. Only asymmetries can cause core magnetization for purely differential currents. The respective magnetical path goes through the air where most of it's reluctance is located. So the saturation ampere turns number in differential mode is quite large.thanks, but I am not talking about such asymmetry, I am talking of magnetising current, and how this can saturate a common mode choke......specially one like the one in the top post, which has a high inductance (2mH) for such a small size, so even small magnetising current will saturate it.
It's almost certain that those current numbers don't refer to a saturation point, but rather a 45C temperature rise due to conduction losses. That means that it's a limitation on RMS current applied over long periods of time (minutes, probably).The Rated current is in the CM part number
SS11(1)-R22020-CH 2.2 is rated for 2.2A so anything over this will be called saturation.
It's almost certain that those current numbers don't refer to a saturation point, but rather a 45C temperature rise due to conduction losses. That means that it's a limitation on RMS current applied over long periods of time (minutes, probably).
The short answer to the original question is that there's no way to tell what the saturation characteristics are from the documentation, for either differential or CM current. Either contact the manufacturer, or try and measure it yourself.
I highly doubt you'll see any saturation behavior due to differential currents, at the very least it would be a very soft saturation since the leakage flux should not penetrate the core very much.
For the 50/60Hz component of the differential current, resistive losses are always going to dominate for any type of ferrite or powdered iron. Regardless of whether saturation is occurring. If the max current number had anything to do with core losses then it would have to be specified along with a frequency (probably ~100kHz), without that it would be meaningless.Cheaper quality cores have more or equal eddy current losses than saturation induced conduction losses, true , but not these.The ferrite quality is so high that they can use thin cores with fatter conductors and thus conduction losses dominate when saturation occurs, not eddy current.
Looking at their documentation, their Bms values are around 400-600mT, which is pretty typical for soft ferrites, a little high if anything.To add more clarity, the Tesla rating for Effective Saturation Magnetic Flux Density is defined by this below , which is well below the effective saturation point and the peak saturation point which is BS, which is not the point I was referring to.
Bms is where saturation threshold s defined
mt I believe you were referring to BS.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?