Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

About RCD snubber ckt
About RCD snubber ckt
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 9th August 2012, 07:18 AM   #1
Aucosticraft is offline Aucosticraft  India
diyAudio Member
 
Join Date: Nov 2009
Location: Pune
Default About RCD snubber ckt

1) If snubber is to protect the switching transistor, then if the max voltage during turnoff of device is lesser than the Max VDS rating of mosfet, do we still need snubber?
2) If we implement snubber at primary winding of flyback transformer, do we need to add protection across the switching mosfet?
3) While designing snubber if we calculate peak voltage that would appear across switching mosfet.So after applying snubber ckt, Can we choose mosfet with lower voltage ?
4) how can leakage inductance be minimied? Or what factors influance leakage inductance of flyback transformer?
5) Wish to understand what is deltaVs (delta snubber voltage). (in application notes its said to be allowed ripple but cant get idea what do they mean by it.)
__________________
There is always a first time....
  Reply With Quote
Old 10th August 2012, 01:37 PM   #2
Aucosticraft is offline Aucosticraft  India
diyAudio Member
 
Join Date: Nov 2009
Location: Pune
Somebody pls, help
__________________
There is always a first time....
  Reply With Quote
Old 12th August 2012, 09:59 PM   #3
whizgeek is offline whizgeek  Ireland
diyAudio Member
 
Join Date: Feb 2010
1. The transient peaks can not be predicted accurately to be less than Vds Max. Also very fast, very difficult to measure.
2. The snubber across the transformer does not protect switch from its own stray inductance. ie. self inductance, pcb tracks, lead wires, etc.
3. if you accept 1 & 2 above.
4. transformer design, pcb design. search online for trafo design notes.
5. DeltaV is the rate of change of voltage. ie. rise/fall time. usually refers to snubber design, to prevent turn-on of the switch device by very fast transients.
  Reply With Quote
Old 19th August 2012, 11:42 AM   #4
Aucosticraft is offline Aucosticraft  India
diyAudio Member
 
Join Date: Nov 2009
Location: Pune
Whizgeek, thanks for your reply.

& sorry for the delay, its only today i checked this thread after 12th of aug, thinking its gone dead.
__________________
There is always a first time....
  Reply With Quote
Old 19th August 2012, 12:13 PM   #5
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Au is obviously not interested in researching his new project !
__________________
regards Andrew T.
  Reply With Quote
Old 19th August 2012, 02:09 PM   #6
Aucosticraft is offline Aucosticraft  India
diyAudio Member
 
Join Date: Nov 2009
Location: Pune
Dear Whizgeek, Vds is mentioned as voltage , its not a factor of time. although this is used in calculation of Csn( snubber capacitor) so i guess its about damping voltage. and its time relation. but not able to visualize it. Can I request you a figure (diagram) or a reference link. or may be even you can elaborate it to me.
__________________
There is always a first time....
  Reply With Quote

Reply


About RCD snubber cktHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tone control ckt using TL072 shahraj Multi-Way 2 13th October 2009 05:52 PM
Will this ckt work fine? rejithcv Power Supplies 42 30th November 2006 08:04 AM
power amp proctection ckt!!! arasuk Solid State 8 27th February 2005 05:59 PM
What book for MOSFET ckt analysis??? batee Pass Labs 5 11th March 2004 04:05 AM
crecendo me protection ckt victordsouza Solid State 0 2nd February 2004 08:37 AM


New To Site? Need Help?

All times are GMT. The time now is 06:35 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki