Understanding a split-mode power supply.

[Phil Allison]

"Arfa Daily"

It's not at all uncommon to see switchers that are secondary-side
linear-regulated only. I worked on a mixer / PA just a couple of weeks ago
which had a full blown switcher in it. The main rails for the output
stages had no regulation at all, and were completely dependant on the
input line voltage.

** Such amplifier supplies are actually push pull, square wave inverters.

It is not possible to have regulated output without the using an active
PFC/regulator stage prior to the main inverter.

Also, because the inverter's output IS a square wave, full wave
rectification produces a pure DC voltage.

So what was the advantage of complicating things by using a switcher ?

** Major sales gimmick.

I can only assume that it's primarily because it's a portable item of band
equipment, so it makes it much lighter to carry around.

** The big joke is that at least 95% of all such amplifiers are permanently
installed in venues.

Plus musos love to buy the heaviest tube amps they can find and use them
with heaviest speakers ever made.


....... Phil

 

[Sylvia Else]

N_Cook wrote:

Thanks for the reference.

Sylvia.

I obtained a second hand ex-library copy for a few dollars plus postage.
Interesting reading.

Judging by the book's condition - mint - I'd have to wonder whether it
was ever even looked at.

Sylvia.

 

[terryc]

Judging by the book's condition - mint - I'd have to wonder whether it
was ever even looked at.

Which Library?
I've seen mint books in some TAFE libraries that are of the same vintage.

 

[Sylvia Else]

Which Library?
I've seen mint books in some TAFE libraries that are of the same vintage.

Erie Community College, Williamsville, New York state, USA.

The postage cost more than the book did.

I'll probably get an email from them now saying it was stolen and that
they want it back

Sylvia.