magnetics question

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

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