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Class D Switching Power Amplifiers and Power D/A conversion

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Old 6th December 2009, 02:01 PM   #71
ArthurG is offline ArthurG  France
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Quote:
Originally Posted by ChocoHolic View Post
Hi Arthur!
You say it is possible at the same price?
I say it is possible at lower price.
In class D for 1kW or above the required power semiconductors are less, the required PSU is less, the required heat sinks are less.
It is just a question of time until also the low cost manufacturers all over the world (not only China) will gain the necessary know how and the difference in sales price will melt.
Let's not start to discuss if this is good or bad, it's just obvious.
I totally agree with you !
At high power, a SMPS + class D amp is cheaper to manufacture than a Linear PSU + class AB/H one. From my calculation, the inflexion point is actually somewhere around 450W 8ohm / 800W 4ohm where you can get this power with 2 cheap 200V Mosfets and a PSU based on self resonant ETD49 and a halfbridge of cheap 40A IBGT with integrated hyperfast diode. In class AB design, you need a heavy costly 1500VA transformer and at least 6 pairs of 220V/15A bipolar transistors.
The key point, as you said, is the knowledge to make the class D design cost effective, reliable, stable and performing well. And actually in Asia, nobody knows how to do. They only know how to copy (most of the time badly) Lab.Gruppen and powersoft designs which are not cost effective !
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Old 7th December 2009, 10:44 PM   #72
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hello friends, if is possible i want pcb desin this amp irs2092_6kw and the ref. of transistors with two driver circuits my mail is foxeletronic@ibest.com.br
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Old 9th December 2009, 04:20 AM   #73
JIMMEE is offline JIMMEE  Thailand
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Old 9th December 2009, 10:56 AM   #74
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Hi Jinmee the image does not open ...
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Old 12th December 2009, 02:52 AM   #75
luyleag is offline luyleag  Thailand
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Send PCB to me wichan_wr@hotmail.com
Thk. very much
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Old 12th December 2009, 08:49 AM   #76
Eva is offline Eva  Spain
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Why so much interest in something that is inherently flawed and cannot produce the claimed power (or even work)?

I admit that the name of the thread is very attractive, but...
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I use to feel like the small child in The Emperor's New Clothes tale
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Old 12th December 2009, 12:17 PM   #77
luka is offline luka  Slovenia
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Quote:
Originally Posted by Eva View Post
Why so much interest in something that is inherently flawed and cannot produce the claimed power (or even work)?

I admit that the name of the thread is very attractive, but...
I don't know about you, but I can't wait to see how many will fail and post this there
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Old 12th December 2009, 04:31 PM   #78
djQUAN is offline djQUAN  Philippines
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Originally Posted by luka View Post
I don't know about you, but I can't wait to see how many will fail and post this there
and they also don't know english very well.
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Old 12th December 2009, 05:20 PM   #79
luka is offline luka  Slovenia
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Originally Posted by djQUAN View Post
and they also don't know english very well.
Pictures then, even better
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Old 12th December 2009, 07:35 PM   #80
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KKK, and do you know the Portuguese well there? I think all deserve to be respected, after all we are all humans until today only one that knows everything was born.
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