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Class D Switching Power Amplifiers and Power D/A conversion

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Old 12th February 2013, 05:28 PM   #321
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yes apex
but they are not so professional and industrial production
visit http://labgruppen.com/
they have up to 20000W!! (20KW) D-class amplifier and use toroid cores.
(its visible in PLM20000 photos)
also bosch (Dynacord powermate-3 DSA series) and Crown as i sow before
and HONAMIC also
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Old 12th February 2013, 08:06 PM   #322
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Quote:
Originally Posted by SAEED JOON View Post
yes apex
but they are not so professional and industrial production
visit http://labgruppen.com/
they have up to 20000W!! (20KW) D-class amplifier and use toroid cores.
(its visible in PLM20000 photos)
also bosch (Dynacord powermate-3 DSA series) and Crown as i sow before
and HONAMIC also
D200 also is not professional and industial product just simple class D amp for diy.
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Old 13th February 2013, 12:50 AM   #323
IRSound is offline IRSound  Germany
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SAEED JOON,

lab amps aren't class-d , their amps are based on Tracking Class-D or TD and the final stage is an AB class Amplifier.
Crown also using Micrometals -2 material but they are original core and never gets warm in low output current like you said before. for example T157-2 gets warm about 55 degree @ 10A output current and 150vPP inductor voltage i guess.
Dynacord is new in Class-D , i saw their using torodial core in PM-3 but can't guess the type of material because it's not visible clearly. maybe -2 material. you got a picture from inside ?

what is HONAMIC then !? any picture form inside ?

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as apex said , D200 is good for start working on class-d , i learned meany things with this amp.

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IRSound
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Old 13th February 2013, 01:51 PM   #324
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dear IRsound
u absolutely right
in PM-3 they used 4 stage filter back to back, that core induction decrease in each stage and make the output signal clear and linear just like an AB-class amp output
2 of this cores are clear-red micrometal and 2 other (last stages) are regular white core and dark gray.

as u know D200 is amplifire stage of mackie SRM450 active speakers with -/+75volt rail voltage and absolutely is a high power industrial, safe, and good design.
also its designed base on IRAUDAMP1 from IR reference designed series and its so simple but accurate.
(Honamic is my Brand )

Regards,
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Old 13th February 2013, 05:24 PM   #325
IRSound is offline IRSound  Germany
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Thanks for pictures , did you repair it ? if you have any other info (like part numbers of fets ,etc) please share with us.
using higher order filters isn't very easy , it should design carefully to obtain a good result.

yes i know everything about D200..the input stage-modulator-level shifter circuit taken from Mackie. the power stage-driver is taken from a russian amp. mile upload both schematic before. also the filter characteristic is like mackie.

Quote:
(Honamic is my Brand)
commercial Class-D amps ?

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Old 14th February 2013, 03:15 PM   #326
lycanlk is offline lycanlk  Sri Lanka
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Default Test after mounting heatsink

I reduced the number of turns on the inductor. Now it has 26 turns. I think I made a mistake. According to this: T106-2 It must have 47 turns.

10R/5W resistor heated up too much. I could even smell it. Could hear some noise. FETs also heated up like a class AB amp. Small heatsink is not enough. Are these all because of reducing the turns or something else?

need some help!
Thanks
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Old 14th February 2013, 03:32 PM   #327
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Quote:
Originally Posted by lycanlk View Post
I reduced the number of turns on the inductor. Now it has 26 turns. I think I made a mistake. According to this: T106-2 It must have 47 turns.

10R/5W resistor heated up too much. I could even smell it. Could hear some noise. FETs also heated up like a class AB amp. Small heatsink is not enough. Are these all because of reducing the turns or something else?

need some help!
Thanks
Use 65 turns on T106-2 for 30uH
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Old 14th February 2013, 04:40 PM   #328
IRSound is offline IRSound  Germany
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Quote:
Use 65 turns on T106-2 for 30uH
65 turn will have inductance around 57uH. with 49 Trun of 0.8mm wire , will get 33uH.
- with 26 turn , will have 9uH which is very low and have higher Cut-off frequency more than 75KHz , it have bad effect on output HF.
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Old 14th February 2013, 06:00 PM   #329
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From IRAUDAMP1 manual
http://www.irf.com/technical-info/re.../iraudamp1.pdf
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Old 15th February 2013, 06:19 PM   #330
lycanlk is offline lycanlk  Sri Lanka
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Apex and IRsound,

Thanks for the help!

After winding about 45 turns, it gave me a good result. I had to increase the value of 510R to 2K2 to reduce the noises. Now everything is good. I will wind more turns and test it again later then i wouldn't need to increase 510R.

So far I couldn't reduce the heat emission of outputs in each case. May be IRF640 is not good. Unfortunately I can't find IRFB numbers here.

Amp is stable and overall good. What do you suggest me to increase the output power. Bridging 2 of these or increasing the voltage and outputs?

and waiting for your new amp(pcb)

thanks!
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