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

Class D Switching Power Amplifiers and Power D/A conversion

full differential UcD modulator with extra integrator
full differential UcD modulator with extra integrator
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 7th June 2017, 05:24 PM   #71
Sous is offline Sous  Ukraine
diyAudio Member
 
Join Date: Oct 2011
Location: I-F
This is just the simplest version. Since the network already has a service manual for "nc 400" you can see the circuitry there.

The fully differential modulator worked well, but the implementation of the PCB made the assembly very laborious.

I simplified new device as much as possible.

Last edited by Sous; 7th June 2017 at 05:27 PM.
  Reply With Quote
Old 21st June 2017, 06:17 PM   #72
Sous is offline Sous  Ukraine
diyAudio Member
 
Join Date: Oct 2011
Location: I-F
First prototype
Attached Images
File Type: jpg IMG_20170621_204233_HDR.jpg (312.0 KB, 216 views)
File Type: jpg IMG_20170621_204220_HDR.jpg (236.9 KB, 213 views)
  Reply With Quote
Old 22nd June 2017, 01:38 PM   #73
Erica.C is offline Erica.C  China
diyAudio Member
 
Join Date: Jun 2005
Location: china
Quote:
Originally Posted by Sous View Post
First prototype
Very neat design, thanks for sharing!
and, how is the output power for 8ohm load?
  Reply With Quote
Old 23rd June 2017, 10:11 AM   #74
Sous is offline Sous  Ukraine
diyAudio Member
 
Join Date: Oct 2011
Location: I-F
Thank you very much Erica!
Power is limited by output transistors.
Service step-down stabilizers can operate up to +/- 90V.
I think 200W at 8Ohm should be for IRFB5615
For IRFB4227 it will be necessary to increase dead time, I did not try.
  Reply With Quote
Old 26th June 2017, 04:30 PM   #75
Erica.C is offline Erica.C  China
diyAudio Member
 
Join Date: Jun 2005
Location: china
Quote:
Originally Posted by Sous View Post
Thank you very much Erica!
Power is limited by output transistors.
Agree

Quote:
Originally Posted by Sous View Post
Service step-down stabilizers can operate up to +/- 90V.
I think 200W at 8Ohm should be for IRFB5615
For IRFB4227 it will be necessary to increase dead time, I did not try.
Yes, i want to know the working range of the dc-dc convert to support the gate driver circuit,
Also, i had try to build the amp with the IRS20957 plus IRFB4227, the dead time setting to 25ns, with the regualted power supply(daul 90V) to get 450W output for the 8ohm load! This IRFB4227 is very good MOSFET.
  Reply With Quote
Old 16th July 2017, 06:43 PM   #76
Workhorse is offline Workhorse
diyAudio Member
 
Workhorse's Avatar
 
Join Date: Dec 2004
Quote:
Originally Posted by Pafi View Post

You have 1 comparator with 1 output signal that is duplicated later. You can call it differential, but it doesn't have any benefit over the basic circuit. Contrary to your design it is possible to use 2 different modulators that carries different informations and can be used to suppress unwanted modulation artifacts. That would be fully differential in my terminology.
You mean 3 level PWM ?
  Reply With Quote
Old 17th July 2017, 12:36 PM   #77
kartino is offline kartino  Indonesia
diyAudio Member
 
kartino's Avatar
 
Join Date: Feb 2005
Location: Gunungkidul Indonesia
So workhorse still alive

My discrete UcD has fully differential.
Check my thread.
  Reply With Quote
Old 17th July 2017, 12:55 PM   #78
Workhorse is offline Workhorse
diyAudio Member
 
Workhorse's Avatar
 
Join Date: Dec 2004
Quote:
Originally Posted by kartino View Post
So workhorse still alive

My discrete UcD has fully differential.
Check my thread.
Well that is 2 level PWM we usually call it AD mode. The 3 level PWM which is BD mode is in true sense fully differential IMHO.

Though, one can call the 2 level PWM AD mode as balanced input and bridged output for sure

Last edited by Workhorse; 17th July 2017 at 12:59 PM.
  Reply With Quote
Old 17th July 2017, 01:19 PM   #79
kartino is offline kartino  Indonesia
diyAudio Member
 
kartino's Avatar
 
Join Date: Feb 2005
Location: Gunungkidul Indonesia
Quote:
Originally Posted by Workhorse View Post
Well that is 2 level PWM we usually call it AD mode. The 3 level PWM which is BD mode is in true sense fully differential IMHO.

Though, one can call the 2 level PWM AD mode as balanced input and bridged output for sure
You are right.

Do you have any topology description for reference for class BD?
I am thinking to make it.
  Reply With Quote
Old 17th July 2017, 02:07 PM   #80
kartino is offline kartino  Indonesia
diyAudio Member
 
kartino's Avatar
 
Join Date: Feb 2005
Location: Gunungkidul Indonesia
Hi Sous,

I am very interested by your design, just realized that it is something new for me.
In my country it is hard to find good parts and smd. I am thinking to make it very low cost. As always, I make pro sound. All are full in my mind now.
  Reply With Quote

Reply


full differential UcD modulator with extra integratorHide 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
UCD Based Fully Differential Full Bridge 450W RMS Amp classd4sure Class D 91 3rd June 2017 08:51 AM
A self oscillation differential full bridge D-amp based on UCD topology QuantumTunnel Class D 2 16th March 2015 11:02 AM
Anyone tried a UCD topology as a high level modulator for radio? dmills Class D 5 6th May 2013 06:11 PM
12B4 PP Full Differential Amp Notion Sheldon Tubes / Valves 8 21st May 2008 01:12 AM
Full bridge UcD Help, not work witali Class D 2 24th March 2006 01:34 PM


New To Site? Need Help?

All times are GMT. The time now is 09:03 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki