Go Back   Home > Forums > Amplifiers > Power Supplies

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 10th May 2009, 11:36 PM   #1
diyAudio Member
 
Join Date: Feb 2009
Send a message via AIM to albert_emule Send a message via MSN to albert_emule Send a message via Yahoo to albert_emule
Default curious defect

curious defect

http://s186.photobucket.com/albums/x...SMPSIR2110.jpg

good night colleagues.
this fountain above, already it is mounted and when it is working only what it-42vcc falls for zero when it places a resistor of thread of 10r x 50W
the tension 42vcc, it does not fall,
two joined intentions (-42 42vcc = 84vcc) does not fall, I placed the same resistor above described.
I already withdrew the couples of referring diodes of exit to-42vcc for verrifica-los and the same completed estam.
I exchanged the position of the couples of diodes to see if the defect changes of position, but the defect continued at the same place.
the uníca praiseworthy explanation what I found, was the fact of the feedback of regulation of being withdrawn only of 42vcc.
I imagine that placing the resistor in the point-42vcc, this one consumes load making to tension falling more and more.
  Reply With Quote
Old 11th May 2009, 07:10 PM   #2
diyAudio Member
 
Join Date: May 2008
Default Re: curious defect

Quote:
Originally posted by albert_emule
the uníca praiseworthy explanation what I found, was the fact of the feedback of regulation of being withdrawn only of 42vcc.
Exactly. The controller has no feedback from the negative rail, so how could it react to a voltage sag there? This power supply will work best, when both rails are equally loaded.
__________________
If you've always done it like that, then it's probably wrong. (Henry Ford)
  Reply With Quote
Old 11th May 2009, 07:25 PM   #3
luka is offline luka  Slovenia
diyAudio Member
 
luka's Avatar
 
Join Date: Sep 2005
Location: in Slovenia :)
Send a message via Skype™ to luka
Default Re: Re: curious defect

Quote:
Originally posted by pacificblue

Exactly. The controller has no feedback from the negative rail, so how could it react to a voltage sag there? This power supply will work best, when both rails are equally loaded.
X2!!
__________________
home page @ http://www.classdaudio.tk/ @ 24/7 all year long
I FEEL SLOVENIA
  Reply With Quote
Old 11th May 2009, 08:31 PM   #4
star882 is offline star882  United States
diyAudio Member
 
star882's Avatar
 
Join Date: Mar 2007
The output section looks a lot like that of the power supply for some old computer speakers I had. The supply even says something like "+ and - outputs must be loaded simultaneously".

So it's a design limitation, not a fault. Use two independent switchers for independent regulation.
__________________
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
  Reply With Quote
Old 13th May 2009, 08:03 PM   #5
Eva is offline Eva  Spain
diyAudio Member
 
Eva's Avatar
 
Join Date: Oct 2003
Location: Near the sea
Send a message via MSN to Eva
A well coupled output inductor should provide acceptable cross-regulation.
__________________
I use to feel like the small child in The Emperor's New Clothes tale
  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
Help CDPro defect muizel Digital Source 0 3rd February 2009 06:15 PM
pass x250.5 a little defect... kyrochan Pass Labs 10 30th May 2006 11:19 PM
Tube defect - What is the problem. gary f Tubes / Valves 2 7th November 2004 06:17 PM
Marantz CD80 defect please help racefrans Digital Source 0 22nd April 2004 10:49 AM
Cyrus dAD7 defect August Digital Source 1 23rd March 2004 07:56 AM


New To Site? Need Help?

All times are GMT. The time now is 04:49 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