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Class D Switching Power Amplifiers and Power D/A conversion

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Old 1st March 2011, 05:33 PM   #901
Pafi is offline Pafi  Hungary
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Old 1st March 2011, 06:06 PM   #902
NMOS is offline NMOS  Germany
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Originally Posted by Pafi View Post
norazmi!

, and place Rg between emitter and base!
sorry... Im beginner what is Rg ?
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Old 2nd March 2011, 04:43 AM   #903
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Resistor originally in series with gate.
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Old 3rd March 2011, 09:10 AM   #904
NMOS is offline NMOS  Germany
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Originally Posted by Pafi View Post
norazmi!

only the discharge needs to be made faster. Connect base to IR2110, collector to source, emitter to gate, and place Rg between emitter and base!
Hi Pafi

Im beginner and a little confused how to do mit BC327...

please check schematic..... is this ok or wrong ?

could you assist me ?

regards
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File Type: pdf UCD BC327 gate discharge.pdf (15.7 KB, 507 views)
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Old 3rd March 2011, 11:34 AM   #905
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Quote:
Originally Posted by NMOS View Post
Hi Pafi

Im beginner and a little confused how to do mit BC327...

please check schematic..... is this ok or wrong ?

could you assist me ?

regards
The connection of the BC237s is OK, but you must erase D4 and D3.
By the way, do not use IRFP250N, the BC237 will make them discharge faster, but their body diodes are still very bad, so you don't really increase performance
(maybe you make it worse: this extra will make them switch faster, faster switching means higher dI/dt, so will mean more diode loss!)

Pafi's trick is appropiate for FETs with low Rdson, low Qcc (good body diode), but high Qgate. Its a very nice trick for other drivers such as IRS2092 (where 1A gate charge is enough, but 1,2A gate discharge should be made faster...)
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Old 3rd March 2011, 05:17 PM   #906
kubeek is offline kubeek  Czech Republic
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I just had an interesitng idea, would it be possible to use this amplifier topology to create a free oscillating SMPS?

My idea is to use it in a full bridge configuration to crate the power rails for the actual apmplifier. Would the free oscillation frequency cause any RFI problems?
My goal is to design a compact scalable 100-500W PSU+amplifier to power bass speaker.
Any suggestions?
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Old 3rd March 2011, 07:11 PM   #907
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Talking pcbs arrived

I've received my boards , they look great for me .
I´ll need time xD to build them.

regards!

ty ejtagle!
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File Type: jpg DSC01815_1024x590.jpg (134.3 KB, 1132 views)
File Type: jpg ucd bott_810x768.jpg (123.0 KB, 1105 views)
File Type: jpg ucd top_823x768.jpg (142.4 KB, 1065 views)

Last edited by electroconico; 3rd March 2011 at 07:14 PM.
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Old 3rd March 2011, 09:55 PM   #908
luka is offline luka  Slovenia
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hope it works, build and test and report back
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Old 3rd March 2011, 10:00 PM   #909
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Quote:
Originally Posted by kubeek View Post
I just had an interesitng idea, would it be possible to use this amplifier topology to create a free oscillating SMPS?

My idea is to use it in a full bridge configuration to crate the power rails for the actual apmplifier. Would the free oscillation frequency cause any RFI problems?
My goal is to design a compact scalable 100-500W PSU+amplifier to power bass speaker.
Any suggestions?
Its really off-topic, but yes, its possible. There are self-oscillating SMPS, they are mostly used at fluorescent lamps.
Skori Weblapja - Rezonns kapcsolzem tpegysg II.
Here is Skory's page, its in Hungarian, he is an expert in this topic, but im sure you will understand the schematics, and with google translator it will be better.
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Old 5th March 2011, 11:51 AM   #910
NMOS is offline NMOS  Germany
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Quote:
Originally Posted by Pafi View Post
Do It Yourself!

For high voltage (more than 200 V): diode trick, or IGBT is needed.

Hello, as beginner please can you teach me what is diode trick ?
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