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Class D Switching Power Amplifiers and Power D/A conversion

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Old 21st July 2010, 06:19 PM   #501
alkasar is offline alkasar  France
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Quote:
Originally Posted by Don Jerry View Post
Notice that with SMPS you don't need large tank caps, instead they could create some problem to the SMPS for some reasons related to its feedback circuit.
Bye
theorethically agree, but I read on diyaudio the feedback of someone who tried smps + very large cap. He says the classT sound much better overall and particularly significantly improvement in bass. I will try out by myself with T3 when its ready
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Old 21st July 2010, 09:29 PM   #502
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Quote:
Originally Posted by alkasar View Post
theorethically agree, but I read on diyaudio the feedback of someone who tried smps + very large cap. He says the classT sound much better overall and particularly significantly improvement in bass. I will try out by myself with T3 when its ready
I am really interested in your results. I also read here where someone tried one of these big Farad !! powercaps usually taken for caraudio ... 10 x bigger and heavier than the amp board
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Old 21st July 2010, 09:56 PM   #503
alkasar is offline alkasar  France
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Originally Posted by TheDealer View Post
I am really interested in your results. I also read here where someone tried one of these big Farad !! powercaps usually taken for caraudio ... 10 x bigger and heavier than the amp board
yes, this is the comment I also read but can't find the link anymore
1F these caraudio guys are crazy
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Old 22nd July 2010, 04:47 AM   #504
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Originally Posted by alkasar View Post
now i am confused
This is a linear PS board, with rectifier and filtering+tank caps. Only needs a transformer and done. In this use case, caps need to be bigger.

If SMPS is used, there is no need for an additional PS board, correct ?
The only reason I can see to use this PS board with SMPS, is to benefit from the tank caps. But then, why bother with a board : simply wire one large cap or more in parallel up to the desired tank size.

Sorry, i just don't get the use case you have in mind for this PS board.

Can you share the schematic of the PS board ?
I use upc1237 on this board and you can find that rectifier can be used for instant turn off function, duiring both a transformer or an SMPS is using.
If an SMPS is used with T3, we don't suggest too big caps.
If a transformer is used, the VA value should be big enough, or you have to improve the tank caps then.
So, may be we can say 4700uF caps are built in for common usage?

Last edited by hifimediy; 22nd July 2010 at 04:58 AM.
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Old 22nd July 2010, 05:05 AM   #505
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Cables for T3. Made by hands
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Old 22nd July 2010, 08:23 AM   #506
alkasar is offline alkasar  France
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Quote:
Originally Posted by hifimediy View Post
I use upc1237 on this board and you can find that rectifier can be used for instant turn off function, during both a transformer or an SMPS is using.
If an SMPS is used with T3, we don't suggest too big caps.
If a transformer is used, the VA value should be big enough, or you have to improve the tank caps then.
So, may be we can say 4700uF caps are built in for common usage?
Thanks hifimediy. I now remember you said you will also put a loudspeaker protection on the PS board. This is a reason to use the PS with T3 even with SMPS.

Quote:
If an SMPS is used with T3, we don't suggest too big caps.
you mean T3 board may suffer from large caps or you mean that large caps are useless as they will not improve performance ?
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Old 22nd July 2010, 08:27 AM   #507
alkasar is offline alkasar  France
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one more question : will the PS board have both AC input and DC input, to bypass the rectifier in case a SMPS is used ?
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Old 22nd July 2010, 08:39 AM   #508
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Quote:
Originally Posted by alkasar View Post
yes, this is the comment I also read but can't find the link anymore
1F these caraudio guys are crazy
In the car audio the voltage is fixed to 12V (13.7V when the engine is working), so if you wanna increase the watt you've to rise up the current available (W = V*A).
In the home audio you can easily increase the voltage, for example 30V for the TK2050, so the current issues are less significative.

Also consider that if you connect a 1F cap to an smps, it will never power on!
An smps is not capable of working in short circuit, and during the power on (transient) a capacitor is equal to a short circuit.
In such case the smps would go into the protection mode for overcurrent.
Assuming that it works, then there will be the risk of smps oscillating, because is "difficult" for the feedback circuit understand what's happen to the load if there is too much capacity into the line.

In my opinion if the smps is a bit overpowered for the application, you don't need any "extra" capacitors (just a good cap on the board as near as possible to the power stage).
In my case I'm using 18A max smps (ATX modified...) for the TK2050, is like a cannon to shoot a fly
When I shut down the power supply, the board still work for a couple of seconds... that's the demonstration that extra caps are not needed.
Bye!
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Old 22nd July 2010, 09:05 AM   #509
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Quote:
Originally Posted by alkasar View Post
one more question : will the PS board have both AC input and DC input, to bypass the rectifier in case a SMPS is used ?
I don't know the T3 board, but I assume that you can easily desolder the rectifier and short opportunely its board plugs. Then you can connect directly the DC, respecting the correct polarity of course (I did that on my TK2050 board).
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Old 22nd July 2010, 09:38 AM   #510
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Quote:
Originally Posted by alkasar View Post
Thanks hifimediy. I now remember you said you will also put a loudspeaker protection on the PS board. This is a reason to use the PS with T3 even with SMPS.


you mean T3 board may suffer from large caps or you mean that large caps are useless as they will not improve performance ?
I think neither of them.
Too large caps will lead to SMPS error as Don just said. And caps we use now is not "Too big" in my opinion. But refer to different type of SMPS used, the caps may have to change to reach the best. If you find that overcurrent is happened to your SMPS, you may have to remove some of the 4700uF caps on the PSU.
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