diode in parallel in rectifier - diyAudio
Go Back   Home > Forums > Commercial Sector > Manufacturers > AKSA

AKSA Builders of market proven kits and modules at sound quality to rival the best in high end

Reply
 
Thread Tools Search this Thread
Old 5th November 2013, 05:07 PM   #1
diyAudio Member
 
Join Date: May 2010
Location: mumbai(India)
Default diode in parallel in rectifier

can i parallel the diodes in bridge rectifier ckt for increasing current ?
  Reply With Quote
Old 5th November 2013, 05:36 PM   #2
diyAudio Member
 
Frank Berry's Avatar
 
Join Date: Sep 2003
Location: Midland, Michigan
When you put diodes in parallel, you must put a low value resistor in series with each diode so that they can share the current. Diodes don't always conduct at the exact same voltage. The resistors allow a slight bit of voltage drop on each diode.
__________________
Frank
  Reply With Quote
Old 5th November 2013, 06:11 PM   #3
PIZ is offline PIZ
diyAudio Member
 
Join Date: Aug 2013
Hi,
The ressistor has not to be necessary...with rising current through a diode the forward voltage will rise too, so the parallel diode takes more of the current.
If the diodes are the same type it should generally work...how ever I would not double the maximum current ability with two diodes...would recommend a 1,5x max
  Reply With Quote
Old 5th November 2013, 09:43 PM   #4
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

The problem is forward voltage drops with temperature
so you cannot rely on diodes to reliably share current,
one diode can current hog, so no resistor is wrong.

Bigger diodes as a replacement is the proper way to do it.

rgds, sreten.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 5th November 2013 at 09:46 PM.
  Reply With Quote
Old 7th November 2013, 04:39 PM   #5
diyAudio Member
 
meanman1964's Avatar
 
Join Date: Oct 2006
Location: Belgium the land of chocolate
What has this to do with Aksa?You're at the wrong thread
  Reply With Quote
Old 7th November 2013, 04:44 PM   #6
diyAudio Member
 
Frank Berry's Avatar
 
Join Date: Sep 2003
Location: Midland, Michigan
I agree with you sreten. My reply was in response to the OP question.
It's really not a good idea to parallel diodes. Even if you can balance the current through the multiple diodes, the necessary resistors will cause a sag in the voltage as the current increases.
__________________
Frank
  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 in rectifier diode selection necplusultra Power Supplies 3 26th January 2011 07:25 PM
Parallel diode vs antiparallel diode phieuxuatkho Class D 6 31st October 2010 12:54 PM
Tube rectifier to diode bereanbill Tubes / Valves 19 19th May 2009 11:37 PM
BYV79E as rectifier diode tubee Solid State 5 18th June 2008 02:45 PM
diode rectifier ratings redrabbit Power Supplies 8 13th November 2006 05:33 AM


New To Site? Need Help?

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