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selfservice 16th August 2006 06:56 PM

Class D Amplifier Power Supply Design -> 12,5 A @ +/-80V = 1000W
2 Attachment(s)
hello guys

i'm going to build the biggest amplifier ever built by me :smash:
the main trouble is the power supply, a toroid is too much expensive and too much weight.

so i have decided for a switched mode power supply :att'n:
i've found a design for a 700W power supply and i've modified it to deliver a maximum of 1000W, 80+80V.

here is the layout and the top and bottom layer, i'm searching for suggestions and improvments before producing the pcb.
of course is possible to order more pcb if you want one of them :cool:

selfservice 17th August 2006 03:41 AM

this is the second and the third part of the schematic
this is the layers and layout

selfservice 17th August 2006 11:38 AM

some trouble with the links...
try to copy and paste this:

edl 17th August 2006 12:06 PM

Hi Selfservice,

There are some errors in the attached schemas.

C72, C73, C76, C77 are misprinted, they need to be diodes. A graetz bridge, for that power a 600V/25A type is needed.

In the +/-12V supply a 7912 is needed in the lower side.

On the margin it looks an interesting project.


selfservice 18th August 2006 03:03 PM

thank you for the quick reply!

for the graetz bridge there are faston connectors for the bridge to be applied on the heatsink via some cables, for simplyfing the layout. :clown:

for the -12V, cause is used only by the op-amps, i've decided to use only a resistor and a zener diode. the +12V is used also for the SG IC and so i've decided to stabilize it.

ultra 25th August 2006 01:43 PM

Seems to be a very good idea for anybody who dares in life....
Do you know the mains transformer ratio/turns?
And what about the current transformer?

selfservice 25th August 2006 06:59 PM

the turns for the current transformer have to be found experimentally, i haven't tested the trasformer at full power, so i don't know the exact turn ratio.

for the main trasformer are 28 turns for the primary and 12+12 for the secondary

kvintus 30th August 2006 09:55 AM

:bigeyes: Great looking project! If this turns out to be working well I'd definately be interested in building one!


DavidWardlaw 30th August 2006 06:46 PM

I'd also be intereste in a pcb if you get this thing to work.

mahirerensan 30th August 2006 08:37 PM

Very thanks.very good designe.What is T1 transformer.ETD49,ETD54 etc..?

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