Mains rectifier currents into SMPS - 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 19th August 2011, 10:44 AM   #1
Banned
 
Join Date: Jun 2011
Default Mains rectifier currents into SMPS

Hello,

We have designed an offline SMPS for 330W maximum, Class D amplifier supply.

The mains input is 90VAC to 265VAC.
-We have a voltage doubler link for when its used in places with 90VAC........

We have NO power factor corrector stage, as it would have made it too expensive.

On continuous maximum load, at 90VAC, the mains input current consists of a train of pulses at 100Hz, and above 20 Amps in magnitude.

Obviously the input current harmonics are enormous, and we are wondering if we will get through the regulatory body requirements?

-The thing is, though we can put a Voltech PM100 power analyzer on the input and get the values of the harmonics, we cannot find what the regulatory body requirements are in respect of this.

Do you know how we can find out.?

I tried compliance-club.com but couldnt find it on there.

Google searching this also reveals nothing.

Also EN61000-3-2 does not seem to depict our situation, but just seems to talk generally about it.
  Reply With Quote
Old 19th August 2011, 11:36 AM   #2
marce is offline marce  United Kingdom
diyAudio Member
 
Join Date: Jun 2007
Location: Blackburn, Lancs
Look for CE or FCC based sites, I had a link to the main site, but cant find it.
There may be some relevant links from this site.
There is a threaqd regarding the EMC of these sort of designs on this section that also has a lot of relevant links.
  Reply With Quote
Old 19th August 2011, 11:38 AM   #3
marce is offline marce  United Kingdom
diyAudio Member
 
Join Date: Jun 2007
Location: Blackburn, Lancs
Switcher EMC design
  Reply With Quote
Old 19th August 2011, 11:54 PM   #4
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Here is a mains filter I used on equipment up to 30 amps.
The equipment flew through EMC testing.

http://www.ckp-railways.talktalk.net/MAINSFILTER.jpg
  Reply With Quote
Old 19th August 2011, 11:56 PM   #5
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Quote:
Originally Posted by eem2am View Post
Hello,

Also EN61000-3-2 does not seem to depict our situation, but just seems to talk generally about it.
If I remember correctly audio equipment is exempt.
Up to a certain wattage if I remember correctly.
  Reply With Quote
Old 21st August 2011, 07:56 PM   #6
Banned
 
Join Date: Jun 2011
Thanks for the links but i couldnt find info there...

I am coming to the conclusion that for offline audio SMPS's, it is simply not possible to find a document explaining what are acceptable levels of mains current harmonics flowing into a non power factor corrected SMPS for audio usage.

I believe that audio smps's don't need pfc, -but the only reason i believe that is that i see off-the-shelf offline smps's from Abletec and coldamp which are on the market and don't have PFC, despite being rated to 100's of Watts.

I do not believe that there is a document that actually states that PFC is not required for audio SMPS's.

I do not get enlightened on this by reading EN61000-3-2.

Does any reader know how audio SMPS manufacturers find out the regulations that they need to design to?
  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
how to choose the right rectifier (non smps) DiMenSioN Power Supplies 15 16th April 2008 05:10 PM
Slaving a mains SMPS...why not gmphadte Power Supplies 3 5th November 2007 08:06 PM
output rectifier choice for SMPS zilog Power Supplies 3 18th February 2007 04:56 PM
Toroid or EE Ferrite core, which is Best for 240V mains SMPS Workhorse Power Supplies 49 6th February 2007 06:44 PM
SMPS that runs off AC mains LBHajdu Power Supplies 2 4th March 2005 05:00 PM


New To Site? Need Help?

All times are GMT. The time now is 04:40 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