diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Class D (http://www.diyaudio.com/forums/class-d/)
-   -   Success with class-d? (http://www.diyaudio.com/forums/class-d/34718-success-class-d.html)

ZeroTHD 25th May 2004 12:02 PM

Success with class-d?
 
Hi,
I'm currently doing some simulation on a Class-d circuit based on Bruno.P's patent. I'm just curious- what is the success rate in designing/bulding a high performance class-d amp. here in this forum? It seems "fairly simple" to design a conventional class-d amp. (triangle-wave-->comparator...) , but these self-oscillating animals might be much harder?
Any hints?
Thanks,
Anders

dmfraser 25th May 2004 04:34 PM

Self Oscillating
 
Self Oscilating designs are much harder but appear to sound better. I use the self-oscillating ICE Power modules in my products and they sound great. Look up the ICE Power web site and download the AES papers on the design thoery.

demons_wing 25th May 2004 05:21 PM

would you have the web address maybe?

hitsware 25th May 2004 05:42 PM

2 Attachment(s)
here's a simple approach....

Nelson Pass 25th May 2004 05:59 PM

I don't think self oscillating designs are harder. What's hard
is the same stuff as clocked designs - switching speed,
sensitive comparators, output filtering.

I've built some quite simple Class D amps at relatively low
power levels using plain old IC comparators driving
complementary Mosfets, and decent results were not hard
to achieve. Gordon Holt even said one of them sounded good
(although he is notoriously polite) ;)

ZeroTHD 25th May 2004 06:00 PM

I have a "working" schematic which have some problem with shoot-through and that measures about 12% THD right now. I have some problem with getting rid of the switching waveform from the audio output. I will post the schematic soon for comments if you're interested.
The reason for my original post is that I don't really understand why no DIY:er has tried the self-oscillating type when it seems to quite doable by reading the Karsten.N thesis and Bruno.P's patent.
Regards,
Anders

Jan-Peter 25th May 2004 06:49 PM

Hi,

One of the DIYaudio (IVX) members has a website with an selfoscillating Class-D amplifiers. I think it is based on the older Philips Soda.

Probably this is a good idee for a DIY project ;-)

http://amploid.narod.ru/article.htm

The sad point it is in Russisch, but with altavista you can translate it.

Succes!

Regards,

Jan-Peter

www.hypex.nl

IVX 25th May 2004 07:40 PM

IMHO, layout (and decoupling), that's really important for class D amp generally... My first version of UcD_like amp PCB had some surprise (see attachment), but p2p amp had worked well. BTW, if C14 will be grounded to point between C and R2... will nothing change. Great skill there is, if the first version worked fine.:cool:

IVX 25th May 2004 07:45 PM

2 Attachment(s)
Where is attached GIF?:confused:

Workhorse 25th May 2004 11:44 PM

Commentable Thoughts
 
Quote:

Originally posted by ZeroTHD
The reason for my original post is that I don't really understand why no DIY:er has tried the self-oscillating type when it seems to quite doable by reading the Karsten.N thesis and Bruno.P's patent.
Regards,
Anders

The reason is simple , U cant synchronise multiple Self-Oscillating Class-D amps to a common SWitching frequency.
Compliments
AMPMAN


All times are GMT. The time now is 10:56 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