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

snubber designing for full bridge power supply
snubber designing for full bridge power supply
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
Thread Tools Search this Thread
Old 28th May 2012, 02:56 PM   #1
8409513 is offline 8409513
diyAudio Member
Join Date: May 2012
Default snubber designing for full bridge power supply

Hi, I want to design snubber for full bridge power supply. I don,t know what to do!!!! what snubber is suitable? and how it will be connect to mosfet? whai is it's calculation?plz help me with this.
  Reply With Quote
Old 28th May 2012, 03:27 PM   #2
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
diyAudio Member
Osvaldo de Banfield's Avatar
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
Hi boy. Normally, snubbers canīt be calculated., they are only aproximations.. I read some literature at the respect, and in conclusion, the trouble is easily solved empirically in the circuit.

The best way is the following: with the circuit working in normal conditions, measure the frequency of the ringing to be eliminated. So, try small capacitors in parallel to the primary of the transformer to tune to 1/2 such frequency, or any other frequency of your interest. Then, start to add small resistor in series with the capacitor, and go increasing its value to damp completely the ringing. Be careful with high voltages in the circuits and the power of the resistor, which obviously must be non inductive.

If you want, you can distribute the cap and the r in two MOSFETīs, or in the 4 ones.

Good luck.
Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001.
Argentine Ham Radio LW1DSE since 1987.
  Reply With Quote
Old 28th May 2012, 10:37 PM   #3
Speedskater is offline Speedskater  United States
diyAudio Member
Speedskater's Avatar
Join Date: Sep 2002
Location: Lakewood, Ohio
Jim Hagerman at Hagerman Technology has an old paper:

"Calculating Optimum Snubbers"

  Reply With Quote
Old 4th June 2012, 11:55 AM   #4
Fanuc is offline Fanuc  United Kingdom
diyAudio Member
Join Date: Feb 2006
Location: Anstruther, Fife
Default Snubbers

Thanks for the link to that article SpeedSkater.

It appears to me now that it's the RLC resonant tank circuit that is the problem (ie. using soft recovery or shottky diodes is mostly irrelevant and ineffective.)

Toriodals are wideband also. Huge reservior capacitor's do not help.

It's hard to get the data on transfromers unfortunately, but the author's suggested methods to measure transformer inductance and interwinding capacitance do not seem that difficult.

At least we do not need the impedance network part!!


  Reply With Quote


snubber designing for full bridge power supplyHide 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
How to schematic switching power supply full bridge ? cakum Power Supplies 0 1st September 2010 08:56 AM
Power Supply Designing using LM317, RC-snubber okina Power Supplies 4 12th September 2005 02:17 AM
BrianGT snubber power supply upgrade PMeade Chip Amps 3 7th May 2005 01:45 AM
Power Supply Pumping with full bridge edogd Class D 1 3rd February 2005 08:02 PM

New To Site? Need Help?

All times are GMT. The time now is 09:00 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio