Help on 2400W Phase Shift PSU - Page 4 - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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 26th May 2010, 04:11 PM   #31
mag is offline mag  Switzerland
diyAudio Member
 
Join Date: Jan 2008
Location: Chiasso
Hi All,
I think I solved my problem.

I had a wrong estimation of the primary mosfets Coss so that the shim inductance was too high.

Now I have reduced my shim inductance to 2.5uH (it was 10uH) and everything is fine.
With some work on RC and RCD snubbers my peak voltage on the output
mosfetss is clamped at around 90V with acceptable ringing. The power
dissipation in every RCD clamp resistor is around 2.5W which is something I can manage without problem with 2 parallel 3W resistors.

With the reduction of the shim inductance the A-B leg of the H-bridge will enter in ZVS at an higher output current: at around 40A out the A-B leg enters ZVS and the C-D leg enters ZVS at around 10A.

Even when it works in hard switching the efficiency does not suffer too much: it remains above 92.5% from 20A output and above.

"Do you have pics of the layout? "
Attached you will find the secondary side layout. It is a 4 layers pcb.
All the snubber components are not mounted on the pcb but mounted flying on the back side triying to keep the connections as short as possible

ciao

-marco
Attached Files
File Type: pdf sec_layout.pdf (86.2 KB, 264 views)
  Reply With Quote
Old 3rd July 2011, 06:50 PM   #32
cristix is offline cristix  Italy
diyAudio Member
 
Join Date: Jul 2011
Hi ,
I tried to do an boost converter 300W , from 25-40V to 400Vdc .
Can you suggest me some topology ?
Cristix
  Reply With Quote
Old 1st May 2017, 04:02 PM   #33
kees52 is offline kees52  Netherlands
diyAudio Member
 
Join Date: May 2009
Location: Sprang-capelle Holland.
I did see this


I am busy with a fase shift welding inverter for MIG, this needs to be a voltage feedbacked one, a constant voltage source.

I ask myself there are different topologies and I did see that for welding she use the quasi resonant types with a UC1865 controller who do have a VCO and not a normal pcm as in the fase shift version. I read however that fase shift get used more, these do work better? or maybe someone on this thread do now what is the best way.

For the supply who I want to use for the hybrid amplifiers what do put put 65 + 65 v 20 amps 300 volts 300 mA, and 15 volts 5 amps, resonant type with the UC3865 because the transformer sees then a sinusoidal signal who is more friendly for capacitors, and I have soft switching, for welding this is also used.

Thanks for advise,

PS can I use a toiroidal transformer like this one?. keeps radiation small.

https://www.google.nl/url?sa=t&rct=j...hMLiQw&cad=rja

regards
Attached Images
File Type: jpg ScreenHunter_88 May. 01 16.10.jpg (151.8 KB, 22 views)
File Type: jpg ScreenHunter_85 Apr. 30 13.52.jpg (209.3 KB, 23 views)
File Type: jpg ScreenHunter_81 Apr. 27 15.19.jpg (182.2 KB, 14 views)
File Type: jpg ScreenHunter_89 May. 01 18.06.jpg (129.7 KB, 15 views)

Last edited by kees52; 1st May 2017 at 04:06 PM.
  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
Phase Shift PWM Andrew Eckhardt Class D 6 14th November 2010 07:56 AM
Why am I getting a positive phase shift sigpl Solid State 22 29th December 2009 04:31 PM
phase shift of second order filter bondo Multi-Way 9 8th April 2009 02:24 AM
Zero phase-shift gareth Solid State 11 9th May 2008 04:45 PM
Creating positive phase shift? Pabo Class D 31 14th January 2005 06:44 AM


New To Site? Need Help?

All times are GMT. The time now is 12:35 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki