Trasformer performance is intrinsic to the core used

[Tim Williams]

The most V.s per turn you can apply, for a given (cored) transformer, is
independent of what you do with that core (e.g., gap).

Another way to state this: A_L * At(sat) = constant, this being the V.s
figure of the core.

The core's inductivity has no effect on performance, though you want it high
enough that magnetization is insignificant.

A fairly basic observation, but I thought it important to note that gapped
or ungapped cores don't matter in the least to transformers.

Tim

 

[Phil Allison]

"Tim Williams"

The most V.s per turn you can apply, for a given (cored) transformer, is
independent of what you do with that core (e.g., gap).

Another way to state this: A_L * At(sat) = constant, this being the V.s
figure of the core.

The core's inductivity has no effect on performance, though you want it
high enough that magnetization is insignificant.

A fairly basic observation, but I thought it important to note that gapped
or ungapped cores don't matter in the least to transformers.

** That last sentence is very misleading - cos gapping the core of a
transformer has a dramatic effect on performance.

Your post is entirely without a context so is all but meaningless.

Try to do better next time - pal.



...... Phil

 

[legg]

The most V.s per turn you can apply, for a given (cored) transformer, is
independent of what you do with that core (e.g., gap).

Another way to state this: A_L * At(sat) = constant, this being the V.s
figure of the core.

Bsat is dependent material and temperature.

Cores stressed to higher B will self-heat, reducing Bsat for ferrites
and some other materials.

This core loss has a positive temperature coefficient at the upper end
of the temperature range in most materials - setting up the potential
for thermal run-away.

Cores heated by their windings will also show reduced Bsat and similar
temperature problems.

The core's inductivity has no effect on performance, though you want it high
enough that magnetization is insignificant.

A fairly basic observation, but I thought it important to note that gapped
or ungapped cores don't matter in the least to transformers.

For simple 'DC' transformers this may be true. Avoiding core
saturation is only of primary importance in saturation-limited
designs, where minimal support of volt-second withstand is provided at
a minimum operating frequency.

Throughput power is typically increased for a fixed core size when
higher frequency operation is permitted and core loss limits are
probed.

If your topology is saturation-limited, it's only natural to
investigate possible improvements available using other materials that
exhibit a higher saturation limit - to see if the altered core loss
effects of the different materials are over-ridingly detrimental.

Alternately, if your circuit uses resonances to regulate power
throughput, you might consider operating more consistently above
resonance or at higher resonant frequencies.

RL

 

[Tim Williams]

For simple 'DC' transformers this may be true. Avoiding core
saturation is only of primary importance in saturation-limited
designs, where minimal support of volt-second withstand is provided at
a minimum operating frequency.

Ah yes, saturation limited should be emphasized!

If your topology is saturation-limited, it's only natural to
investigate possible improvements available using other materials that
exhibit a higher saturation limit - to see if the altered core loss
effects of the different materials are over-ridingly detrimental.

If you've got a kilogram or two of metglas, I'd love to have it! ;-)
Otherwise, I'm stuck with ferrite.

I haven't seen many extremely-fine-laminated-iron cores, though I'm willing
to bet they might work at 10kHz.

Alternately, if your circuit uses resonances to regulate power
throughput, you might consider operating more consistently above
resonance or at higher resonant frequencies.

For my purpose, the problem is resonance may be as low as 10kHz.

Tim

 

[John Doe]

....

Your post is entirely without a context so is all but meaningless.

Try to do better next time - pal.

Hey Phil. Have you ever had a conversation with someone in
real-life? Was the result something other than...

.... they never spoke with you again

.... they started talking about your mother

.... they slapped you upside the head

That is a rhetorical question, Phil, everyone knows the answer.

You should find another orphanage, Phil, for not quite grown-up
foulmouthed misfits.

 

[Phil Allison]

"John Doe" <[email protected]>


** This anonymous, criminal scumbag needs shooting in the head.

Plus his parents and his kids - if any .....




..... Phil