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Mr. Luddite

On 11/19/2014 8:39 PM, Wayne.B wrote:
On Wed, 19 Nov 2014 16:49:49 -0500, wrote:

Servo systems on the ships were 400 hz and I am sure the air force
guys will jump in and talk about the power systems on their planes.
You know the difference right away when you touch it. You get a ring,
not a hum..

===

400 Hz systems on planes date back to the days of World War 2. It was
well understood that higher AC frequencies saved considerable weight
on power components like transformers and servos.

One thing about switch mode supplies ... there are many types and
selection is dependent on application. Like everything their design is
a compromise between performance, cost and other operating parameters.

I think many run at converted frequencies of 50khz and higher, depending
on application.