magnetics question...

[Piotr Wyderski]

jlarkin@highlandsniptechnology.com wrote:

The Coilcraft PL300 transformers are fabulous, 300 watts in a
surface-mount package. Their Spice coupling coefficient is 0.9996.

And pretty cheap, as I can see. But the 1500 Vrms is a bit low.

Best regards, Piotr

 

[legg]

On Thu, 7 Apr 2022 18:12:25 +0200, Arie de Muijnck
<eternal.september@ademu.com> wrote:

On 2022-04-06 23:00, legg wrote:
On Wed, 6 Apr 2022 18:45:43 +0200, Arie de Muijnck
eternal.september@ademu.com> wrote:
Yes, which is exactly why switching PSU\'s are now the standard. The cost
saving in iron (ferrite) and copper and capacitors, and all transport
costs, far outweighs (pun intended) the cost of the semiconductors.

And why airplanes use 400 Hz - the tiny transformers I had designed in
in the product were amusing, 8 times smaller than the usual 50 hz versions.

Arie

I think you\'re living in the past. 60-400Hz magnetics are
routinely shipped around the world for local cost reduction,
making \'iron\' transport costs irrelevant.

Only end-use weight and volume remain significant.

RL

In the past? Could be, I designed it more than 30 years ago.

But airplane equipment should still be as light-weight as possible.
Nowadays of course even those 400 Hz transformers will have been
replaced by switchers.

Arie

I was refering to transport costs of matl. In the past, this
also encouraged local mfr of LF magnetics.

RL