Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Class D Switching Power Amplifiers and Power D/A conversion

variable switch mode PSU
variable switch mode PSU
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
Thread Tools Search this Thread
Old 10th September 2013, 12:47 AM   #1
Nekojita is offline Nekojita  United States
diyAudio Member
Join Date: Nov 2011
Default variable switch mode PSU


For some class D experimentation that I am doing I need a switch mode PSU with the following basic specifications:

Adjustable 0-60V
Max current 3A @ 60V
Input 24V DC ( I have a 24V 10A offline PSU)

Adjustments means in order of preference:
1) Digital
2) Voltage
3) Potentiometer

I've looked everywhere online and cannot find something that I can easily modify for this including the DIY sites, Linear Technology website (LTSpice models), Ebay, Amazon (converter modules), etc.

If anyone has something that they could throw my way that could meet or be modified to meet my needs, it would be hugely appreciated.


  Reply With Quote
Old 10th September 2013, 02:03 AM   #2
gmarsh is offline gmarsh  Canada
diyAudio Member
gmarsh's Avatar
Join Date: Apr 2004
Location: Halifax, NS
Xantrex made a 60V/5A switching lab supply that I've seen in several different labs, and they can't be the only company making the things. Keep an eye on eBay, craigslist, etc.

But if you insist on building it yourself...

If you can get a higher voltage offline PSU that does 72V or 96V, your hunt will probably get a bit easier as you can use a buck instead of a buck-boost converter. Buying two 36/48V supplies, ungrounding the output of one of them and putting them in series will get you there, if a higher voltage supply is hard to come by.

Once you get that, if precise regulation of the output isn't that important, it'll probably be easier to build an open-loop buck converter using a 555 timer/pot/comparator to create an adjustable duty cycle PWM, and feeding it into a half bridge driver feeding a couple of fets.

To do precise regulation of the output, there's plenty of buck controllers out there that'll do the job -though you probably won't be able to adjust the output down to zero, and it might be hard to compensate the supply over the whole load/voltage range.
  Reply With Quote
Old 10th September 2013, 05:08 PM   #3
Nekojita is offline Nekojita  United States
diyAudio Member
Join Date: Nov 2011

Thanks for your reply and comments. I have looked at the lab supplies and really wonder how they are able to make these switching with such a wide voltage and load range. I'd love to a a copy of the Xantrex unit's schematic that you mentioned.

I am thinking that likely I'll need to use both a boost and buck converter and figure out an intelligent scheme to adjust both simultaneously.

  Reply With Quote


variable switch mode PSUHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Switch mode PSU for wireless router - restricting performance? sharpi31 PC Based 11 5th December 2012 07:40 PM
Quad II Switch Mode PSU GEoffreygb Tubes / Valves 1 6th November 2011 02:54 PM
Switch mode PSU argonrepublic Power Supplies 2 18th October 2009 10:08 PM
Switch-mode PSU for tube heaters? deltavektor Tubes / Valves 9 31st October 2008 08:07 AM
Troublesome Switch mode PSU stigla Solid State 9 23rd June 2002 12:28 PM

New To Site? Need Help?

All times are GMT. The time now is 10:27 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio