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Old 25th May 2004, 12:02 PM   #1
ZeroTHD is offline ZeroTHD  Sweden
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Default 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
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Old 25th May 2004, 04:34 PM   #2
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Default 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.
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Old 25th May 2004, 05:21 PM   #3
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would you have the web address maybe?
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Old 25th May 2004, 05:42 PM   #4
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here's a simple approach....
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Old 25th May 2004, 05:59 PM   #5
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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)
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Old 25th May 2004, 06:00 PM   #6
ZeroTHD is offline ZeroTHD  Sweden
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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
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Old 25th May 2004, 06:49 PM   #7
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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
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Old 25th May 2004, 07:40 PM   #8
IVX is offline IVX  Russian Federation
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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.
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Old 25th May 2004, 07:45 PM   #9
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Where is attached GIF?
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Old 25th May 2004, 11:44 PM   #10
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Arrow 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
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