Transformer with two secondaries and multiple taps - how to parallel? - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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 1st November 2011, 01:54 PM   #1
hates ground loops
diyAudio Member
 
Rodeodave's Avatar
 
Join Date: Dec 2004
Location: in the alps
Blog Entries: 1
Default Transformer with two secondaries and multiple taps - how to parallel?

I have a couple of Ultron Universaltrafo E 12 180 VA transformers. They are E-I type transformers with dual secondary windings, and the secondary windings have multiple taps:

primary: (0-220)
secondary1: (0-20-24-30)
secondary2: (0-20-24-30)

What I want: Secondaries in parallel, 20V output. With increased current capability obviously.

How do I do this? Simply connect the two 0V-taps together, and also the two 20V-taps together? And leaving all the other taps floating?

I can post pictures or provide drawings in case my description is not clear enough...
__________________
Gravity - Making the G since 13.7 billion B.C.
  Reply With Quote
Old 1st November 2011, 01:56 PM   #2
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
nope

let each sec ( 0-20) have his own Graetz

then connect two Graetz outputs in parallel

that way they're isolated with bridges
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  Reply With Quote
Old 1st November 2011, 01:57 PM   #3
diyAudio Member
 
Join Date: Aug 2005
Yep, you can definitely do that.

e: But Zen Mod's suggestion is better.
  Reply With Quote
Old 1st November 2011, 02:13 PM   #4
hates ground loops
diyAudio Member
 
Rodeodave's Avatar
 
Join Date: Dec 2004
Location: in the alps
Blog Entries: 1
Yeah, well, here's the thing: As it is now I'm using the transformer for a bipolar supply, each secondary winding hast its own Grätz, thus producing +/-28V DC. Since the transformer gets fairly hot, I want to feed each Grätz with its own transformer (= using one transformer per polarity).
That's why I need parallel secondaries.
__________________
Gravity - Making the G since 13.7 billion B.C.
  Reply With Quote
Old 1st November 2011, 03:20 PM   #5
jitter is offline jitter  Netherlands
diyAudio Member
 
jitter's Avatar
 
Join Date: Aug 2004
Location: Eindhoven, The Netherlands
Even though, they're rated the same, the secondaries are never exactly 100% identical due to tolerances. Currents will flow between them resulting in a transformer that will heat up more than necessary.
Rectify first, like Zen Mod suggested.
  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
Dynaco 440 Transformer Cathode/Screen Taps 6P1P 6AQ5 UL transformer TheGimp Tubes / Valves 14 30th October 2011 12:20 AM
SimpleSE amp: multiple taps with cathode feedback mluckow Tubes / Valves 27 1st December 2008 07:12 AM
One transformer with 4 secondaries or two transformers with dual secondaries Baka Chip Amps 5 28th November 2008 06:39 AM
Multiple secondaries hook-up!!! Klimon Tubes / Valves 4 10th July 2006 02:32 PM
multiple secondaries on a toroid awashi Power Supplies 12 10th July 2005 06:26 AM


New To Site? Need Help?

All times are GMT. The time now is 02:06 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