Full bridge circuit help - 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
Thread Tools Search this Thread
Old 10th July 2008, 11:13 AM   #1
Krej is offline Krej  England
diyAudio Member
Join Date: Jul 2008
Default Full bridge circuit help

I am thinking of making an inverter with 300w power.
I have made the first step up stage from 12v to 310v. For the full bridge circuit, i want 2 use gate transformer to drive the 4 mosfets.
Can someone help me in constructing the gate trafo...the turns ratio?
Since, it is 50hz conversion, trafo has 2 b iron core, right?
  Reply With Quote
Old 10th July 2008, 11:38 AM   #2
areza is offline areza  Bangladesh
diyAudio Member
Join Date: Jun 2007
use opto instead transformer for 50/60hz, or use discrete transistor driver or use one of the hi/lo bridge ic (ir2110)
Search the forum for power stage.pdf , its a nice h-bridge,
  Reply With Quote
Old 10th July 2008, 01:54 PM   #3
Krej is offline Krej  England
diyAudio Member
Join Date: Jul 2008
Are you sure a 2.2u cap can keep the hi side turned on for 10ms?
  Reply With Quote
Old 10th July 2008, 03:14 PM   #4
areza is offline areza  Bangladesh
diyAudio Member
Join Date: Jun 2007
may be 2.2u is enough , most important is layout , i had to layout few times to get it working with 20%-30% duty cycle, u may need to lower the voltage to 250-260v , also need to use A44 npn as well if u keep the voltage to 310v,
  Reply With Quote
Old 10th July 2008, 05:39 PM   #5
diyAudio Member
Join Date: May 2008
Dear krej,

Not 2.2u, even 500u cap will not be able to keep the high side on for 10 ms, making virtual ground. Your all test and trial will be futile.
IR2110 is for high frequency, not for Low frequency.
It is safe and sound to use driver transformer. When you provide 12v to sg3525, the output will be 6 volt and you made a 1:2 normal linear transformer, so that you get 10v - 12v output in the driver transformer for mosfet gate drive.

Transformer Winding:

180 turn in primary side with s.w.g. 34 wire for 6v input and 4x secondary output should be 400 turn each with same or s.g.36 size wire. It would be a small silicon sheet linear transformer. You must mark start and finish of primary and all the secondaries so that you can connect those 4 secondaries for 2 high sides and 2 low side in such a way that when 1high side and 1 low side is on, then other high side and low side is off and vice versa. If both the high side is on simultaneously, then you will loose all the mosfets as they will be shorted and destroyed.
Other than transformer, you can use PVI safely for full bridge circuit.

বাস্তবে ব্যবহারযোগ্য চিন্তাধারাই মানুষের প্রকৃত সম্পদ।
  Reply With Quote
Old 11th July 2008, 07:17 AM   #6
Krej is offline Krej  England
diyAudio Member
Join Date: Jul 2008
Thanks for the info.
  Reply With Quote


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
full bridge circuit help Krej Power Supplies 1 20th July 2008 05:16 PM
Full Bridge X Half Bridge: What's The Best? CHACALPOWERS Power Supplies 8 18th July 2008 04:45 PM
half-bridge VS. full-bridge gearheadgene Class D 3 25th May 2007 08:49 PM
The difference of Push-pull,Half-bridge,Full-bridge digi01 Chip Amps 0 8th September 2006 02:10 AM
Whats the difference between full bridge and half-bridge SMPS ? skaara Class D 6 3rd February 2005 07:23 PM

New To Site? Need Help?

All times are GMT. The time now is 05:49 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