"~misfit~" wrote in message
...
Somewhere on teh intarwebs Phil Allison wrote:
"Arny Krueger" = Compewter Geek Know All


People like Crown and QSC have been building 5+ KW audio power amps
with SMPS for years.

** But they are not regulated PSUs - but simple square wave
inverter supplies that have no voltage regulation and output 50/60 Hz
ripple.
The availability of rugged IGBTs has made the difference in terms of
reliability.

The only exceptions to this in audio amplifiers are the tiny few
examples with " active PFC corrected " supplies that regulate and
deliver pure DC.

The number of examples of this feature have greatly proliferated in the past
several years.

Just a few of the well-known audio amplifier manufacturers with Class D
power amps with active PFC:

Yamaha http://www.yamahaproaudio.com/global...ucts/speakers/

dB Technologies
http://www.dbtechnologies.com/index....product%5D=168

Halcro http://www.halcro.com/pdf/pfc.pdf

Crown http://www.crownaudio.com/pdf/amps/137231.pdf

Jeff Rowland http://jeffrowlandgroup.com/kb/quest...questionid=521

QSC http://media.qscaudio.com/pdfs/pl69user.pdf

Powersoft
http://www.powersoft-audio.com/en/ab...er-supply.html

Stewart audio
http://www.stewartaudio.com/manuals/...-%20Manual.pdf


etc. etc....




That "active PFC correction" has been common on PC SMPS for three to five
years now. I kept seeing it so often in the spec sheets I had to bone up
on it. Physically it's usually handled by one or two SMD 'daughter' PCBs
with a host of small components and a few microprocessors, mounted near
the mains side of the PSU.
[snip]
--
Shaun.

"Humans will have advanced a long, long, way when religious belief has a
cozy little classification in the DSM."
David Melville (in r.a.s.f1)