500W SMPS topology question.

[Pat]

Hi:

I need a little advice on switching power supplies. I'm looking to
build a 500W power supply for an audio amplifier. I'm not to
experience in switching supplies, and I'm do it as a learning
experience.

What is the best topology for this? From reading general books on power
supplies, it seems that at this power, a full bridge is recommended. It
seems that at this power level, the primary currents and voltages are
difficult to deal with in other topologies, like the fly-back or
standard forward converter. .

I've seen designs on the internet using push-pull for this power
level on an audio amps, but none that use a bridge. From what I've
read, dealing with the possible flux imbalance in a push pull can be a
problem so I'm leaning towards a the bridge (via LTC3722). However,
the only bridge circuits I see online are for really high power (kWs).
What topology do people generally use for this power level?

Thanks

 

[John Woodgate]

I read in sci.electronics.design that Pat <patrick.nee@lmco.com> wrote
(in <1107034442.725725.257690@c13g2000cwb.googlegroups.com&gt about '500W
SMPS topology question.', on Sat, 29 Jan 2005:

I need a little advice on switching power supplies. I'm looking to build
a 500W power supply for an audio amplifier. I'm not to experience in
switching supplies, and I'm do it as a learning experience.

It would certainly be that! An unpleasant one. Switching power supplies
are DIFFICULT, and the higher the power the more difficult. By all means
learn how to design them, but start with something far less ambitious,
20 to 50 W.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

 

[Ian Stirling]

Ken Smith <kensmith@green.rahul.net> wrote:

In article <1107034442.725725.257690@c13g2000cwb.googlegroups.com>,
Pat <patrick.nee@lmco.com> wrote:
Hi:

I need a little advice on switching power supplies. I'm looking to
build a 500W power supply for an audio amplifier. I'm not to
experience in switching supplies, and I'm do it as a learning
experience.

You haven't told us the input and output voltages or whether it needs to
be regulated or not. This is important to the advice you will get.

An unregulated 12V to unregulated 120V 500W DC-DC converter is within the
grasp of a beginer to DC-DC but perhaps not to a beginer in electronics.

The silly bit is that even if you get it right the first time, buying
10* PC power supplies and connecting them in series would probably be
not much more expensive.