Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 2nd January 2004, 10:18 PM   #1
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
Default Switched mode power supplies

Whats the current status on SMPS ?

During the last couple of weeks ive read a few comments like "no big deal" and "ive made several that works fine".

I need a lot of power, like 40A 12 to 30V.

Anybody made something like that that actually works?

AND with a reasonable reliability and expected life to it???

Circlotron you mentioned that SMPS is a nogo no matter what, since i know theyre part of your profession, id like to have a short explanation why it is so.

Magura
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 3rd January 2004, 01:31 AM   #2
diyAudio Member
 
Sch3mat1c's Avatar
 
Join Date: Jan 2003
Location: Milwaukee, WI
Send a message via ICQ to Sch3mat1c Send a message via AIM to Sch3mat1c
All I've heard is that they are noisy as all hell but nobody's yet given me a reason why this noise can't be filtered, so go for it. I've tried a little work with flyback supplies and have had up to 10W output, I need a larger "spring"...

Tim
__________________
Seven Transistor Labs
Projects and Resources
  Reply With Quote
Old 3rd January 2004, 01:34 AM   #3
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
well...monster size inductors are is the smallest problem. I havnt got much clue about the rest, and at 40A this is dangerous i guess

Magura
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 3rd January 2004, 01:46 AM   #4
diyAudio Member
 
Tony Salsich's Avatar
 
Join Date: Dec 2003
Location: Cold country (Wisconsin)
I did an off-line, 30V/1kw supply for a customer. It was a 200khz, full bridge forward converter. Full bridge is a bit complicated, but the transformer was so small. I used a small PQ transformer with a center-tapped foil secondary. The primary was wound with triple insulated wire - great for meeting safety requirements. Rubadue, Furukawa and others make this kind of wire.

  Reply With Quote
Old 3rd January 2004, 01:51 AM   #5
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
Sounds interesting, got schematics for it?

How big is such a thing?....expensive??....reliable??


Magura
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 3rd January 2004, 01:58 AM   #6
diyAudio Member
 
Tony Salsich's Avatar
 
Join Date: Dec 2003
Location: Cold country (Wisconsin)
I can get it to you in a few days. Yes, a bit expensive. It was part of a much bigger system: 1kW PFC front end, four independent full bridge outputs (for driving thermo-electric coolers). Basically a big pain in the ***, but also a great learning exerience. Each pice of the system was pretty straight forward, but making them all play together on one board was tough. It did meet class B conducted emissions though.
  Reply With Quote
Old 3rd January 2004, 02:00 AM   #7
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
what is the expected life of such a monster?

Magura
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 3rd January 2004, 02:01 AM   #8
diyAudio Member
 
Tony Salsich's Avatar
 
Join Date: Dec 2003
Location: Cold country (Wisconsin)
I don't know what should 'wear out'. Should last years.
  Reply With Quote
Old 3rd January 2004, 02:11 AM   #9
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Quote:
Originally posted by Sch3mat1c
All I've heard is that they are noisy as all hell but nobody's yet given me a reason why this noise can't be filtered, so go for it. I've tried a little work with flyback supplies and have had up to 10W output, I need a larger "spring"...
Tim
as you filter a square wave, eventually you get a pretty good sine wave but then you reduce efficiency -- this is how I use a PIC as a low distortion oscillator --

take a look at Application Note 70 on Linear Tech's website -- they have the noise down to where it can be used in hydrophones, medical applications, etc. You can order the parts from Linear directly, they have a low noise gate driver using the same slew-control technology.
  Reply With Quote
Old 3rd January 2004, 02:12 AM   #10
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
How about getting +30-0- -30V, is that possible in a reasonable way?

How about an option to regulate the output voltage, lets say from 12V to 30V ?

Magura
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
switched-mode power suppies Dimitar13 Everything Else 0 19th February 2008 12:50 AM
PFC Switched-Mode Power Supply N-Channel Power Supplies 57 13th June 2005 07:56 PM
Switched mode power supply MMicke Car Audio 3 19th February 2005 10:42 AM
Switch mode power supplies ANTHONY2181 Swap Meet 0 15th August 2002 04:30 PM
Switched Mode vs Linear Power Supply royalmp2001 Solid State 4 12th July 2002 08:04 PM


New To Site? Need Help?

All times are GMT. The time now is 11:34 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2