Class D Amplifier Power Supply Design -> 12,5 A @ +/-80V = 1000W - diyAudio
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Old 16th August 2006, 06:56 PM   #1
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Default Class D Amplifier Power Supply Design -> 12,5 A @ +/-80V = 1000W

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
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File Type: jpg sch1.jpg (75.6 KB, 2056 views)
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Old 17th August 2006, 03:41 AM   #2
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this is the second and the third part of the schematic
Click the image to open in full size.
Click the image to open in full size.
this is the layers and layout
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
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Old 17th August 2006, 11:38 AM   #3
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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
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Old 17th August 2006, 12:06 PM   #4
edl is offline edl  Hungary
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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,
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Old 18th August 2006, 03:03 PM   #5
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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.
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Old 25th August 2006, 01:43 PM   #6
ultra is offline ultra  Greece
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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?
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Old 25th August 2006, 06:59 PM   #7
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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
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Old 30th August 2006, 09:55 AM   #8
kvintus is offline kvintus  Finland
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Great looking project! If this turns out to be working well I'd definately be interested in building one!

/Anders
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Old 30th August 2006, 06:46 PM   #9
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I'd also be intereste in a pcb if you get this thing to work.
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Old 30th August 2006, 08:37 PM   #10
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Very thanks.very good designe.What is T1 transformer.ETD49,ETD54 etc..?
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