Class D Amplifier Power Supply Design -> 12,5 A @ +/-80V = 1000W

selfservice · 16th August 2006, 06:56 PM

hello guys

i'm going to build the biggest amplifier ever built by me

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

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

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:

www.cronokart.com/images/images/sch2.JPG
www.cronokart.com/images/images/sch3.JPG
www.cronokart.com/images/images/bot.JPG
www.cronokart.com/images/images/top.JPG
www.cronokart.com/images/images/layout.JPG

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.

Regards,

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.

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

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

/Anders

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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17th August 2006, 03:41 AM	#2
selfservice diyAudio Member Join Date: Jul 2004 Location: italy	this is the second and the third part of the schematic this is the layers and layout

17th August 2006, 11:38 AM	#3
selfservice diyAudio Member Join Date: Jul 2004 Location: italy	some trouble with the links... try to copy and paste this: www.cronokart.com/images/images/sch2.JPG www.cronokart.com/images/images/sch3.JPG www.cronokart.com/images/images/bot.JPG www.cronokart.com/images/images/top.JPG www.cronokart.com/images/images/layout.JPG

17th August 2006, 12:06 PM	#4
edl diyAudio Member Join Date: Oct 2004	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. Regards,

18th August 2006, 03:03 PM	#5
selfservice diyAudio Member Join Date: Jul 2004 Location: italy	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. 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.

25th August 2006, 01:43 PM	#6
ultra diyAudio Member Join Date: Jun 2005 Location: Athens	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?

25th August 2006, 06:59 PM	#7
selfservice diyAudio Member Join Date: Jul 2004 Location: italy	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

30th August 2006, 09:55 AM	#8
kvintus diyAudio Member Join Date: Aug 2004 Location: Finland	Great looking project! If this turns out to be working well I'd definately be interested in building one! /Anders

30th August 2006, 06:46 PM	#9
DavidWardlaw diyAudio Member Join Date: Jul 2006	I'd also be intereste in a pcb if you get this thing to work.

30th August 2006, 08:37 PM	#10
mahirerensan diyAudio Member Join Date: Oct 2004 Location: ist	Very thanks.very good designe.What is T1 transformer.ETD49,ETD54 etc..?

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