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Class D Switching Power Amplifiers and Power D/A conversion

bridge feedback in classD
bridge feedback in classD
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Old 5th February 2018, 07:59 PM   #1
TroelsM is offline TroelsM  Denmark
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Default bridge feedback in classD

OK, the usual disclaimer: Im no expert on classD or feedback systems, but I'm trying to learn. I dont learn with heavy math or control-theory, but with practical circuits (practical can be LTSpice :-) ).

This is my starting point from Lars Clausen (New ClassD): http://newclassd.com/images/ncdconfig4.png

It's simple a sim's easy with LTSpice. It sims nicely with an stanard LT082, but maybe it should be a real comperator?

But how do we go from that and to a bridge design?

Without having a clear idea, I tried this:
Click the image to open in full size.
LTSpice file is (hopefully) attached.

It sims, but I'm not really sure that it "makes sense".
I tried different ways of making a simple, sim-friendly halfbridge driver. - any ideas on a better solution for sim's?

Any good reads on this? - easy on the math please

Kind Regards TroelsM

PS.: I have intention of making a high fidelity amplifier. Maybe a subwoofer-amp if it ever comes that far.
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File Type: asc classd voltage diff feedback 1.asc (8.8 KB, 4 views)
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Last edited by TroelsM; 5th February 2018 at 08:11 PM. Reason: added a PS
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Old 7th February 2018, 12:15 PM   #2
kartino is offline kartino  Indonesia
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Old 8th February 2018, 12:48 PM   #3
Electrone is offline Electrone  United States
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Quote:
Originally Posted by TroelsM View Post
OK, the usual disclaimer: Im no expert on classD or feedback systems, but I'm trying to learn. I dont learn with heavy math or control-theory, but with practical circuits (practical can be LTSpice :-) ).

This is my starting point from Lars Clausen (New ClassD): http://newclassd.com/images/ncdconfig4.png

It's simple a sim's easy with LTSpice. It sims nicely with an stanard LT082, but maybe it should be a real comperator?

But how do we go from that and to a bridge design?

Without having a clear idea, I tried this:
Click the image to open in full size.
LTSpice file is (hopefully) attached.

It sims, but I'm not really sure that it "makes sense".
I tried different ways of making a simple, sim-friendly halfbridge driver. - any ideas on a better solution for sim's?

Any good reads on this? - easy on the math please

Kind Regards TroelsM

PS.: I have intention of making a high fidelity amplifier. Maybe a subwoofer-amp if it ever comes that far.
Because of common mode voltages, I suggest four fully functional inputs for a bridge.

My experience was needing just a few watts for everything besides bass. The sub speaker enclosure was a bit undersized and sealed for tight bass. It needed a lot of power for a satisfying output level. But it was smooth.

Last edited by Electrone; 8th February 2018 at 12:55 PM.
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Old 25th February 2018, 10:30 PM   #4
Electrone is offline Electrone  United States
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After some more evaluation, it looks to me like a circuit with only two inputs can work well in a bridged output amplifier.
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