Why SMPS output inductors *not* coupled? - 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 2nd January 2012, 10:50 AM   #1
Banned
 
Join Date: Jun 2011
Default Why SMPS output inductors *not* coupled?

The SPS30 SMPS is a +/-58V, 4A bridge or forward type SMPS with output inductors which are *not* coupled..........-the two outpout inductors are seen in the picture on page 1 of the datasheet (the two red coils)

https://www.coldamp.com/store/media/...tasheet_en.pdf


I would think that the SPS30 was a current mode controlled SMPS, because current mode gives quicker transient response than voltage mode...and is just easier to control....so i assume that they chose current mode control

Page 3 , part 5 of the following clearly states that output inductors should be coupled with current mode converters.....

http://www.ti.com/lit/an/slua119/slua119.pdf

So does any reader know why the output inductors of SPS30 are not coupled?
  Reply With Quote
Old 2nd January 2012, 12:42 PM   #2
Banned
 
Join Date: Sep 2011
Wish to see EMI measurements for the same SMPS
  Reply With Quote
Old 2nd January 2012, 03:19 PM   #3
diyAudio Member
 
Join Date: Apr 2006
Location: Minnesota
The reference you gave says "coupled inductors are required for good cross regulation." Note that the regulation of the SPS30 is extremely poor, so obviously, they wouldn't care about coupled inductors.
  Reply With Quote
Old 3rd January 2012, 12:56 PM   #4
ssanmor is offline ssanmor  Spain
diyAudio Member
 
Join Date: Jan 2002
Location: Madrid
The photos you are seeing are not updated.
Check here:

SPS30:
https://www.coldamp.com/store/sps30.html

SPS80:
https://www.coldamp.com/store/sps80.html

SPS80HV:
https://www.coldamp.com/store/sps80hv.html

Sonora Combo (integrated PSU):
https://www.coldamp.com/store/sonora-combo-2s300.html

Since three years ago or so all our SMPS have coupled ouptut inductors for better cross regulation.
In fact, SPSXX regulation is extremely good, why do you say that, sawreyrw?
This reminds me that we need to update some datasheet photographs! Thanks!
  Reply With Quote
Old 3rd January 2012, 04:02 PM   #5
diyAudio Member
 
Join Date: Apr 2006
Location: Minnesota
Duh, I misunderstood that the output is adjustable, and instead thought it was regulation. Sorry.
  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
Class D SMPS...with coupled inductor output? eem2am Power Supplies 0 20th August 2011 08:59 AM
Inrush current in smps and it's inductors? markusA Power Supplies 5 29th July 2011 12:27 PM
Aikido transformer coupled output kacernator Tubes / Valves 15 23rd October 2010 10:41 PM
cap coupled output combined with cap coupled input? nightanole Analog Line Level 9 24th July 2010 09:34 PM
coupled output inductor in dual smps schiller Power Supplies 4 7th April 2010 09:10 PM


New To Site? Need Help?

All times are GMT. The time now is 04:03 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