I'm not talking about corner cases.Arguing the corner cases does not do much for the OP except perhaps to add confusion ...
I also can't remember that I have seen "Q" of inductors mentioned in a switcher application note.
But when comparing different inductors at light load I experienced differences between different inductors that I could not explain with the datasheet specifications.
Currently most datasheets are insufficient about their material losses.
I'm not sure C_mitra has a good handle on the real meaning of Q & therefore D. I cannot agree with much of what (s)he has posted....
Manufacturers shy away from specifying Q - as it generally points clearly to how poor the total losses are in their parts.
For most ferrites, eddy losses can be considered zero.
Is really not so difficult to estimate hysteresis loss.
There are many ferrite formulations each with their capabilities many ferrites will become very lossy at 1200khz with slight magnetizing current.
is not that accurate for power grade ferrites, more accurately MnZn (power ) ferrites have only a few ohm-metre's of resistivity and NiZn ferrites have about x10 more for freq's of 500kHz up ...Most ferrites have very high electrical resistivity and that means that the eddy losses are very low
more accurately MnZn (power ) ferrites have only a few ohm-metre's of resistivity and NiZn ferrites have about x10 more for freq's of 500kHz up ...
NiZn ferrites have about x10 more for freq's of 500kHz up...
Yes, Let's say that is not completely correct.Hi,
Am I wrong with this:
If "Q" is different for different frequencies (sine waveform), and because it's obvious that the typical swicher waveform is far away from sine ( because of it's overtones and DC) .... isn't it then obvious that one has to take care about the waveform?
it also has AC resistance...
Easy peasy is obviously referring to AC resistance caused by skin and proximity effect of the winding.I am learning new things. Do you have some reliable references where I can learn more about the AC resistance of copper?
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?