My ucd car amplifier

Ferda

Ferda

New member
Hi all,

This is my first post here. I could not find time to post for a long time. Anyway, people probably know who i am and they know the circuit from other forums. It was very long time ago to start this design and project. But due to the my profession i could not find some time to finish it. The photos below belong to the nearly finished amp. It gives 186W RMS into 4R speaker. And as you can see it is a six channel class-d car amp oscillating at ~400Khz.

Best wishes,
Ferda
 

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ultra

ultra

Member
Congratulations !

Excellent work !

Could you please write a few things about the smps? (Fosc, etc)
 
K

kanon

Member
I think you copy photos from diyaudio not think it's their job ... because nick change .. nothing personal
 
Ferda

Ferda

New member
Ofcourse, The smps is unregulated and the osc frequency is 75kHz. So the actual switching frequency is 37.5kHz. The mosfets for smps are IRF3205 driven by 5240/4240 bipolar totem pole BISS transistors. There are 8 mosfets. The output rectifiers are F20C12/F20A12 and the output voltage ±39V on idle with 12.5V Vin.

ultra said:
Congratulations !

Excellent work !

Could you please write a few things about the smps? (Fosc, etc)
Click to expand...
 
Ferda

Ferda

New member
kanon said:
I think you copy photos from diyaudio not think it's their job ... because nick change .. nothing personal
Click to expand...

Really, then go on there. It is belong to me. Search diyaudio with my nick 'Whortless' and you will see my name at the bottom of some posts. I do not have time to express myself to you.
 
Ferda

Ferda

New member
Hadighorbani said:
Hi
can you please share your class d amp shematic?
Click to expand...

Actually i do not have time to draw all the schematic. You can use Bender.ru's schematic to create the amp. Mine is a bit different there are passive poles on the input/feed back path as the inventor Bruno Putzeys' described on the orginal UCD paper.
 
Ferda

Ferda

New member
pipiripao said:
Read about irs2092 , iraudamp7D & iraudamp7s .

It's a great chip and friendly to use it.
Click to expand...

Dear pipiripao,
Many thanks for your advice. I do not want to use delta/sigma pre-feedback topology. I like the control topology of UCD. However, there are no so much info in the literature about it, except the Bruno's. Anyway, I know the irs2092 and some newer multi channel driver ICs from IR. Thanks
 
Last edited:
Ferda

Ferda

New member
stewin said:
wow nice work freda . what voltage are you using and what are your output fets?
Click to expand...

Thanks,
The output mosfets of the amps IRFB5615 and the supply voltage ±39V with unregulated smps and 12.5V Vin. The output inductor, i wonder you will ask, is 1D23A-330M from ice components (samples).
BW

BTW: my name is FERDA not FreDA :).
 
K

kanon

Member
Ferda said:
Ofcourse, The smps is unregulated and the osc frequency is 75kHz. So the actual switching frequency is 37.5kHz. The mosfets for smps are IRF3205 driven by 5240/4240 bipolar totem pole BISS transistors. There are 8 mosfets. The output rectifiers are F20C12/F20A12 and the output voltage ±39V on idle with 12.5V Vin.
Click to expand...


ohhh..! please came on..
 
ultra

ultra

Member
Ferda said:
Ofcourse, The smps is unregulated and the osc frequency is 75kHz. So the actual switching frequency is 37.5kHz. The mosfets for smps are IRF3205 driven by 5240/4240 bipolar totem pole BISS transistors. There are 8 mosfets. The output rectifiers are F20C12/F20A12 and the output voltage ±39V on idle with 12.5V Vin.
Click to expand...

Very good Ferda. Your pcb looks just fine.
Do you use the mains common mode chokes to the secondary of your trafos to eliminate switching noise?
How many amperes per square millimeter do you calculate on your trafos?
In my opinion, the Fosc is too low to get all this power output.
Personally i have designed a car class AB power amplifier, but the Fosc of the pwm is very high.
Whenever i have some time, i will start a thread.
Again, good job!
 
Ferda

Ferda

New member
ultra said:
Very good Ferda. Your pcb looks just fine.
Do you use the mains common mode chokes to the secondary of your trafos to eliminate switching noise?
How many amperes per square millimeter do you calculate on your trafos?
In my opinion, the Fosc is too low to get all this power output.
Personally i have designed a car class AB power amplifier, but the Fosc of the pwm is very high.
Whenever i have some time, i will start a thread.
Again, good job!
Click to expand...

Hi Ultra,

Thanks for your comments.
The output inductors of secondary side removed from old PC power supply and right they are mains common mode chokes, but they are re-wound with higher current capacity and required value.
I can not remember the current density of pri. or Sec. now. But the primary side 6*1.05mm and secondary 4*0.8mm on each winding.
The transformer cores from magnetics and they are P materials TC38613. If one have a look to their power capacity they are enough for this purpose.
The switching frequency selected 1/10th of amps' switching frequency but can easily be changed a bit upper.
I have ordered the PCB from a china manufacturer as i implied in diyaudio and it was a pain.

BW
Ferda
 
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