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Class D Switching Power Amplifiers and Power D/A conversion

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Old 7th October 2007, 10:18 PM   #11
MOER is offline MOER  United States
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Default Class F

Dear Lars,

Maybe you should check your mathematical skills.

The calculation for power in watts ALWAYS contains either volts squared, amperage squared OR volts x amps.

In any of the three calculations, the voltage and current are RMS terms and in each of the three an "RMS number" is multiplied by an RMS number so how can the answer be a root mean square number?

The load resistance will determine the current so it is quite OK to use the current value as part of the calculation.

So to help out watts may be calculated with three formulas

1) Volts RMS x amp RMS = watts
2) Volts RMS x volts RMS divided by load impedance = watts
3) Amps RMS x amps RMS x load resistance = watts
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Old 8th October 2007, 03:25 AM   #12
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Default Damping factor

Our amplifier have very high dumping factor due to the analog negative feed-back taken from the very speaker output wich normaly is not posible with convencional Class-D.
Our Class-D uses a new more advanced technology wich solves many problems found with convencional class-d designs.

And Mr. MOER don't try to be an expert with so elemental things that everybody with a litle bit of knowledge already knows.
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Old 8th October 2007, 04:00 AM   #13
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0.1% THD is not that great. At what power level and frequency?

OK it's very loud, like PA should be.
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Old 8th October 2007, 06:01 AM   #14
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Default Re: Damping factor

Quote:
Originally posted by Michael-Rifa
Our amplifier have very high dumping factor due to the analog negative feed-back taken from the very speaker output wich normaly is not posible with convencional Class-D.
it would be impressive for 2000, but not for 2007.
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Old 8th October 2007, 06:21 AM   #15
MOER is offline MOER  United States
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Default Class D

Dear Michael,

There are many designs which take feedback from after the low pass filter.

What is "conventional class D"?

What more advanced technology are you using? Your THD numbers are not great, there are quite a few designs with THD far below your 0.1%
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Old 8th October 2007, 06:38 AM   #16
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There is nothing more irritating than companies selling products internationally when the texts of said products have blatant grammatical or spelling errors.
With teams of marketers, engineers and executives, the grasp of the English language seems to elude them.
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Old 8th October 2007, 11:08 AM   #17
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Default New technology

Mr.Richard Ellis, Our product is NOT intentionaly made to sale overseas, ONLY THAILAND. But is overseas countries that are intrested in our product. So do not complain in the speling as we already sale enough in Thailand and we do not need to sale overseas, besides i'm not in the sales department but R & D department and i write in the forum just for fun.

Mr. Moer The dumping factor and other factors such as THD, when the numbers are good enogh, there is no need to make it better as you are not going to feel any diference at all, and we prefer focus in other aspects that do make a diference and they are noticable.

Dumping factor more than 50 is normaly more that enough and do not make any diference if higher than that.

Our technology makes the design very stable and reliable for a class-d amp but i'm not going to reveal how as it is company policy.
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Old 8th October 2007, 11:40 AM   #18
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Default Re: New technology

Quote:
Originally posted by Michael-Rifa
Mr.Richard Ellis, Our product is NOT intentionaly made to sale overseas, ONLY THAILAND. But is overseas countries that are intrested in our product. So do not complain in the speling as we already sale enough in Thailand and we do not need to sale overseas, besides i'm not in the sales department but R & D department and i write in the forum just for fun.

Michael, indeed Post #16 is rather mistake and maybe intended for another thread. By the way, how much a cost of your amp in Thailand?
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Old 8th October 2007, 12:07 PM   #19
Eva is offline Eva  Spain
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MOER:

If you multiply RMS voltage by RMS current, you get average power (also known as RMS power). Then again, Root-of-Mean-of-Squares is a mathematical averaging method (the square root of the integral of the magnitude squared).


Michael Rifa:

At least your product looks somewhat original and you are not trying to sell it here. Note that there are other companies in Asia and India that seem to be selling clones of amplifier models made by well known European and North American firms. Fortunately you seem to be a few steps ahead of them, although after the UcD boom, low-distortion, high-bandwidth, low output impedance, complete damping of filter resonance and post-filter feedback are becoming standard class D features.
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Old 8th October 2007, 12:25 PM   #20
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Quote:
Originally posted by Eva
Note that there are other companies in Asia and India that seem to be selling clones of amplifier models made by well known European and North American firms.
EVITA THIS IS BLATANT LIE IN THE CASE OF INDIA...............

THERE IS NO AMPLIFIER MADE IN INDIA BY ANY MANUFACTURER WHICH IS A DIRECT OR INDIRECT COPY OF ANY EUROPEAN OR NORTH AMERICAN FIRMS, GET YOUR FACTS CORRECTED!!!!!!!!
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