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Old 30th March 2005, 10:08 AM   #1
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Default NuForce amp Single Cycle Control

Hi,

Aside form the marketing junk it doesn't sound too bad.

http://www.nuforce.com/index.html

http://v3.espacenet.com/origdoc?DB=E...&QPN=US6381154

Couple other patents to be found of theirs but... they seem nearly identical.

Cheers,
Chris
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Old 30th March 2005, 11:54 AM   #2
wytco0 is offline wytco0  United Kingdom
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Had a quick look, for the apparent quality the prices look pretty good for a finished amp.

Anyone seen or heard them?

Interesting comment in their "about Us" page

" In addition to our ground breaking Analog Switching Amplifier (based on Class D circuit topologies with NPhysics patented and patent pending modulation techniques), we look forward to introduce our ultra-efficient, high power (1000W and beyond) Class N Audio Amplifier in 2005."
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Old 30th March 2005, 01:17 PM   #3
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Hi Chris,

I beleive this is what you are looking for. It has been some time since I looked at the patent application, but as far as I can remember it is a variant of ampliverter design using single ended front end instead of the more usual push pull one.

BTW, Nphysics is parent company of Nuforce

Best regards,

Jaka Racman
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Old 30th March 2005, 05:17 PM   #4
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Hi,

I am sorry, but in my previous post I was actually referring to this patent.

It is interesting that all ampliverter patents fail to cite US4479175 as prior art.

Best regards,

Jaka Racman
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Old 30th March 2005, 07:16 PM   #5
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Hi,

after looking at their site, it seems that they are not using ampliverter design yet, but switching amplifier with SMPS.

They use post filter feedback and control that is not unlike that of UcD.

Measurement results look respectable. See atached picture.

Best regards,

Jaka Racman
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Old 30th March 2005, 08:13 PM   #6
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Hello,

Wytco0, I think the cost is reasonable because of their SMPS usage. The prices are on par with some of their competition but they don't yet seem to be meeting anywhere near the power levels of their competition.

I missed that part about comming out with a >2000W amp. We'll believe that when we see it won't we? They dont' seem to even have a 200W one yet, so that's quite the leap. I hope they don't mean ten 200W channels @PMPO.

Hi Jaka,

Yeah I've seen they're somehow affiliated with Nphysics as well, the topology seems a little different though, but I think they work the same way. These jokers seem to be refering to it as "Class N" as well....

The patent I linked to should be one of the older ones for what they're selling on their website.

This link seems stuffed up now but you should be able to a find more of their recent ones here, they're very similar but perhaps only go into more detail.

http://v3.espacenet.com/results?sf=a...&IC=&=&=&=&=&=

Yeah that graph looks great, they said ruler flat response up to 150kHz, would be interesting to hear.
Best Regards,
Chris
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Old 27th November 2005, 11:13 AM   #7
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The single cycle control is simply fantastic!

The patent claims to give a 'substantially constant switching frequency', and also a fixed fall-back cycle period. (Hence the single cycle control). Assuming it can process a signal ...
it must modulate the signal on the other (non fixed) half of the cycle, this means it can actually change the cycle time, while at the same time keeping a 'substantially constant switching frequency'. These guys are tough!!

Finally someone broke the time barrier!
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Old 27th November 2005, 11:19 AM   #8
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The Nuforce amps are also "famous" for their 0 degree phase shift over the total bandwidth, something other class-d designs have trouble with.

Don't know if this phase shift is very audible though?
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Old 27th November 2005, 11:45 AM   #9
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Quote:
Originally posted by Lars Clausen

Finally someone broke the time barrier!

Damn, just today I was discussing having only one speaker that morphed dimensions through time for a true surround system.

Hmmmmmmmm would that be digital or analog?


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Old 27th November 2005, 03:54 PM   #10
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Hi

as I mentioned on another post

I was very impressed by the Nuforce amps

compared to the BelCanto T amps.

They seem to have more depth and realism.

We were listening to a Bel Canto front end with

Raven 1 and Thiel Ceramic speakers. The size of the

amp and its amazing lack of mass were also very

endearing. Hope to hear them again soon. Sadly OEM

customers only for doing your own 6 channel version!

Regards

AnthonyPT
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