fullbridge carrier class d ideas - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 10th November 2007, 09:28 AM   #1
Banned
 
Join Date: Jan 2005
Default fullbridge carrier class d ideas

This is an idea that i dreamt up last night.
Schematic

Im positive that itll work what do you think ?

How good are ceramic disc capacitors as output filter ?
  Reply With Quote
Old 10th November 2007, 11:41 AM   #2
diyAudio Member
 
Workhorse's Avatar
 
Join Date: Dec 2004
Where is the feedback network, or you are going for an open loop design......
  Reply With Quote
Old 10th November 2007, 12:16 PM   #3
Banned
 
Join Date: Jan 2005
Since fullbridge class d is suitable for open loop, ill leave feedback out for now.
  Reply With Quote
Old 10th November 2007, 12:56 PM   #4
Eva is offline Eva  Spain
diyAudio Member
 
Eva's Avatar
 
Join Date: Oct 2003
Location: Near the sea
Send a message via MSN to Eva
There is nothing wrong with feedback, your problem seems to be that you are unable to get a decent power stage working... And a full bridge with a fragile IC such as HIP4080 doesn't make things easier.

You also seem to lack important tools such as a decent workbench to work comfortably and a current limited symmetrical power supply (may be DIY) to avoid frying things on small mistakes.
__________________
I use to feel like the small child in The Emperor's New Clothes tale
  Reply With Quote
Old 10th November 2007, 02:32 PM   #5
Banned
 
Join Date: Jan 2005
Maybe im just too lazy to build dedicated supplies.

This is meant to be a subamp so it doesent have to be perfect.
  Reply With Quote
Old 10th November 2007, 06:53 PM   #6
Banned
 
Join Date: Jan 2005
This will go into etching tomorrow:
Click the image to open in full size.

I have chosen a switching freq of approx 200KHz and estimated possible power output to 250W from a 33V supply. The 7815 can handle 35V so i cannot run very much power due to that.

What do you think would be good values for the deadtime resistors, 10k ?
  Reply With Quote
Old 19th November 2007, 07:09 PM   #7
diyAudio Member
 
Join Date: Nov 2007
Quote:
Originally posted by Eva
And a full bridge with a fragile IC such as HIP4080 doesn't make things easier.

This is weird... I had also considerd the HIP4080 for a project that never left the planning stage.

I've had some reliability issues with other devices from Intersil, formerly known as Harris.
But what has been your experience with the HIP4080? I had thought this device was OK. I may be completely wrong, though.
  Reply With Quote
Old 19th November 2007, 07:23 PM   #8
Banned
 
Join Date: Jan 2005
This board never made it to the assembly and soldering department.

Two caramps caught my interest, both uses HIP4080AIP, one is running atm.

Pics: http://ampguts.realmofexcursion.com/Kicker_DX350/
  Reply With Quote
Old 19th November 2007, 07:28 PM   #9
diyAudio Member
 
Join Date: Nov 2007
Default Re: fullbridge carrier class d ideas

Quote:
Originally posted by Tekko
This is an idea that i dreamt up last night.
[
Tekko;
To generate your VDD voltage, which is VCC/2, I would use a TLE2426 precision ground reference from TI.

Also tho generate the traingle wave, select an opamp with symmetrical output swings on the comparator output. And at 200 Khz, you may also be hitting the slew rate limits of the TL082.
Otherwise, the trainglewave may be nonlinear. And remember, nonlinearity means distortion.
  Reply With Quote
Old 20th November 2007, 10:15 AM   #10
m-tech is offline m-tech  Serbia
diyAudio Member
 
Join Date: Feb 2006
Location: Belgrade
It's much better to use LF353 instead of TL082. Changing the op-amps in triangle wave generator will change operating frequency and triangle wave amplitude ( try to simulate first ).
Attached Images
File Type: jpg d.jpg (96.1 KB, 735 views)
  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
Hi freq class D amp design ideas evo2008 Class D 7 1st December 2008 05:01 PM
SG2173P Op-Amp Class B. What can I use it for? Ideas? lineup Solid State 3 2nd September 2008 09:12 PM
Class T - maximizing damping factor, any ideas? Disney_SK Class D 51 22nd June 2008 12:56 PM
Not quite Class D but many ideas taken from kipman725 Class D 2 7th September 2007 08:34 PM


New To Site? Need Help?

All times are GMT. The time now is 04:50 PM.


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