Problem With SMPS - Page 2 - diyAudio
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 25th January 2013, 03:08 AM   #11
xyz9915 is offline xyz9915  Pakistan
diyAudio Member
 
Join Date: Apr 2007
Quote:
Originally Posted by nigelwright7557 View Post
I am not convinced it is a wide range mains input SMPS.

1/ It clearly says 220VAC on the circuit diagram.

2/ The 12 volt regulator needs at least 18 volts to function. So if it is 18 volts at 110VAC then at 240VAC it will be 39 volts which is out of spec for the regulator.
The 12v transformer power separately from 230vac to maintain voltage at regulator (not shown in the schematic)
  Reply With Quote
Old 25th January 2013, 03:10 AM   #12
xyz9915 is offline xyz9915  Pakistan
diyAudio Member
 
Join Date: Apr 2007
Quote:
Originally Posted by sreten View Post
Hi,

The only sensible reason that would happen is if it has two modes.

Its not a problem if its normal operation.

rgds, sreten.
I want this circuit to work with a wide range of voltage (100v to 240v)
  Reply With Quote
Old 27th January 2013, 04:34 AM   #13
xyz9915 is offline xyz9915  Pakistan
diyAudio Member
 
Join Date: Apr 2007
The Problem has been solved by replacing 0.1uF capacitor with 10uF capacitor at Pin9 (Compensation) of SG3525. Now the smps works from 100vac to 240vac.

Thanks to Everyone
  Reply With Quote
Old 27th January 2013, 02:31 PM   #14
dmills is offline dmills  United Kingdom
diyAudio Member
 
Join Date: Aug 2008
Location: High Wycombe
That circuit is clearly not a univeral input supply, and I am somewhat surprised that it works at all at very low input voltage.

The canonical way to do universal input (And at 900W it is not a bad idea anyway) is to start with a power factor correction stage (a boost converter) to produce somewhere around 400V on the storage caps irrespective of the applied input voltage, then follow that with the standard isolated switcher curcuit. Note that PFC voltage control loops can get a bit tricky when the load is audio....

This is all non isolated power electronics so rapidly gets behond the proper scope of these forums.

73 Dan.
  Reply With Quote
Old 28th January 2013, 02:23 PM   #15
xyz9915 is offline xyz9915  Pakistan
diyAudio Member
 
Join Date: Apr 2007
Although the smps works satisfactorily but can someone explain how a big capacitor fixed the problem because a big capacitor capacitor at Pin9 (Compensation) is not usual.
  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
SMPS problem MaXiZ Class D 136 29th October 2012 03:03 PM
Problem with SMPS !!! Minion Power Supplies 5 14th December 2009 08:20 AM
SMPS problem? choncba Car Audio 11 8th May 2008 08:54 AM
SMPS Noise Problem rejithcv Power Supplies 0 13th November 2006 03:33 PM
Small SMPS problem MaXiZ Class D 18 5th January 2004 03:32 PM


New To Site? Need Help?

All times are GMT. The time now is 12:25 AM.


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