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Old 4th May 2009, 07:29 PM   #21
Pafi is offline Pafi  Hungary
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Eva!

Sorry, but I disagree! Though the small signal part of the circuit is not very clever, it's not completely wrong. Level shifting is not needed as long as high power supply is asymmetric (this is not the best thing, but it's still OK). With a very fast OPA the inverter can work acceptably also. In some cases intrinsic dead time of IR2113 can be enough. Input level of IR2113 is 15 V now, so this is a problem, one can't drive it with 5 V signal, but this can be fixed easily by wire Vdd to 5 V.

So basically there is only one mistake, but it's a gigantic one, and shows complete lack of understanding the working of ClassD amps. The power section is perfectly unusable. The MOSFET "half-bridge" is actually not a half-bridge, and filter is not a filter.

As long as 7ormore doesn't know how to design the basic circuit, it's needless to give him advices in connection with performance design.
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Old 4th May 2009, 08:14 PM   #22
Eva is offline Eva  Spain
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Hey Pafi, we both know what he is trying to achieve (and how far is he). He uses 15V and the resistor in the power stage because the thing just fails immediately with more voltage or with no resistor
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Old 4th May 2009, 10:37 PM   #23
Pafi is offline Pafi  Hungary
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Eva!

He wrote Rl=100 ohm next to that resistor on the first schematic!

Against current spikes 10 ohm would be enough.
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Old 5th May 2009, 06:14 AM   #24
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Default Do you even know what you are doing???

Quote:
Originally posted by 7ormore
The only reason i'm currently using this design is because this is the layout my advisor suggested to use.
Thanks
Brian
It simply means that your advisor has no idea of what class-d is or what it takes to build a working class-d amplifier, it surprises me the most that how a rookie advisor could suggest such an advance project to students who are not well versed with basic electronics fundamentals atleast.

The whole concept in your schematic is WRONG...!!!
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Old 5th May 2009, 06:30 AM   #25
luka is offline luka  Slovenia
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Old 5th May 2009, 08:43 AM   #26
Gyula is offline Gyula  Hungary
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Hi 7ormore!

Could you describe what is the function of the superstructure built-up around the TL1056?
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Old 5th May 2009, 10:54 PM   #27
7ormore is offline 7ormore  United States
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Our P-Sim circuit design

http://i607.photobucket.com/albums/t...SIMcircuit.jpg

Our inputs and output the second voltage is a sine wave 180 degrees out of phase, we used that instead of inverting the signal

http://i607.photobucket.com/albums/t...PSIMoutput.jpg


Our updated circuit, yes there are still some major problems

http://i607.photobucket.com/albums/t...d/class-d5.jpg
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Old 6th May 2009, 08:30 AM   #28
Gyula is offline Gyula  Hungary
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Do you know why did you make a proportional integrator from the TL1056? It delays the square-wave and can cause overlap.
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Old 6th May 2009, 12:30 PM   #29
Pafi is offline Pafi  Hungary
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Gyula!

Téged nem idegesít, hogy a csákó nem hajlandó a kérdésekre válaszolni, csak fújja a magáét? Egyébként szerintem a belengések miatt van ott egy pár pF-os kondi.
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Old 6th May 2009, 01:09 PM   #30
Gyula is offline Gyula  Hungary
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Hello!

En csak szabadidomben irogatok. Neha benezek hogy van-e valami erdekes tema es irok valami epito jellegu hozzaszolast.
Kulonosebben nem zavar ha nem ir.
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