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Old 22nd June 2008, 12:20 PM   #1
mahmood is offline mahmood  Iran
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Default -/+ 50 v SMPS

Hi boys :
this is my first switch mode power supply . i want to share
it for you .
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Old 22nd June 2008, 12:57 PM   #2
mahmood is offline mahmood  Iran
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Default continue

my smps
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Old 22nd June 2008, 01:02 PM   #3
mahmood is offline mahmood  Iran
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Default continue1

my smps 2
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Old 22nd June 2008, 01:03 PM   #4
mahmood is offline mahmood  Iran
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Default continue 2

bottom layer
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Old 22nd June 2008, 01:11 PM   #5
guitar_joe is offline guitar_joe  Australia
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looks alright
how does it perform?
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Old 22nd June 2008, 01:22 PM   #6
mahmood is offline mahmood  Iran
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Default hi

like this
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Old 22nd June 2008, 01:44 PM   #7
mahmood is offline mahmood  Iran
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Default hi all

schematic
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Old 22nd June 2008, 02:03 PM   #8
mahmood is offline mahmood  Iran
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Default follow project

the both side is here .
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Old 22nd June 2008, 02:08 PM   #9
mahmood is offline mahmood  Iran
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Default main pcb file

hi all
if you want main pcb file first download the pad2pad from
pad2pad.com and second Email me to send it for you . cause
i can't share it here . it is about 500kByte .
note pad2pad is free software and is about 6MByte .
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Old 23rd June 2008, 04:15 AM   #10
S.G. Mahbub is offline S.G. Mahbub  Bangladesh
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Good effort. Keep it up.
Next time try to avoid linear transformer in smps circuit.
Feed back process is good.
Thanks.
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Old 21st July 2008, 09:16 PM   #11
ravslanka is offline ravslanka  India
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hi mahmood

what is its power rating and can irfp450 be usedin place of 460
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Old 21st July 2008, 10:07 PM   #12
annex666 is offline annex666  England
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I would suggest removing the linear PSU section for the controller - instead it may be better to have an inefficient regulator from the full-rail DC line (rectified mains) which is switched out once the output has stabilized (handed over to a regulated supply derived from the output - i.e. an additional winding).

This should up the overall efficiency once the output has stabilized.
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Old 21st July 2008, 10:07 PM   #13
sawreyrw is offline sawreyrw  United States
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S.G. Mahbub,

What's wrong with the low voltage bias supply? Do you have a better solution that is more cost ($, space, weight, reliable) effective.

Rick
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Old 21st July 2008, 10:10 PM   #14
annex666 is offline annex666  England
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Quote:
Originally posted by sawreyrw
S.G. Mahbub,

What's wrong with the low voltage bias supply? Do you have a better solution that is more cost ($, space, weight, reliable) effective.

Rick
See my above answer (posted a few moments before yours)
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Old 21st July 2008, 10:32 PM   #15
sawreyrw is offline sawreyrw  United States
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annex666,

Good idea, but how well will it regulate? Do you need a series regulator in this case as well?

Let's see what S.G. Mahbub has to say. :-)

Rick
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Old 21st July 2008, 10:53 PM   #16
annex666 is offline annex666  England
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Given the output is fixed, there should be minimal need to regulate the controller supply - maybe a low-dropout linear regulator, or even an LC filter will suffice. The controller is a low current device and probably doesn't have highly critical voltage supply requirements - I would check the datasheet and see what its requirements are, then judge what to do based on that.
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Old 22nd July 2008, 05:39 PM   #17
luka is offline luka  Slovenia
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-/+ 50 v SMPS
Quote:
Originally posted by sawreyrw
annex666,

Good idea, but how well will it regulate? Do you need a series regulator in this case as well?

Let's see what S.G. Mahbub has to say. :-)

Rick
I have used 7812
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Old 18th August 2008, 02:43 AM   #18
LuigiDJ is offline LuigiDJ  Colombia
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Hello to all
Can this design be modified to work on 120Vac? My mains supply is 120 volts, and this smps is what I was looking for.
I have 3 etd59 cores, and want to make 2 active PA speakers, they will need 120volts ac on mains and +/- 65 or 70 volts dc, I'll need to change the turns ratio and the feedback network.
Any help on this?
Thanks
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Old 18th August 2008, 03:26 AM   #19
Samuel Jayaraj is offline Samuel Jayaraj  India
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What is its output current capability? How good is the line and load regulation?

Just the ticket for portable active PA speakers!!

Thanks for sharing.
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Old 18th August 2008, 11:20 PM   #20
wine&dine is offline wine&dine  Austria
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Quote:
Originally posted by LuigiDJ
Can this design be modified to work on 120Vac?
Easy, just use the voltage doubler trick you can find in any PC SMPS that has a 115/230V switch. I just clipped this out of the next best Google result:
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Old 19th August 2008, 08:25 PM   #21
alexclaire is offline alexclaire  France
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Little mistake in the smps schematics

with these zener diodes voltage, Opto led should be connected between +50v and 0V at the output and not between +50 and -50 v as it is stated
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Old 20th August 2008, 12:27 AM   #22
dudaindc is offline dudaindc  United States
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Quote:
Originally posted by alexclaire
Little mistake in the smps schematics

with these zener diodes voltage, Opto led should be connected between +50v and 0V at the output and not between +50 and -50 v as it is stated
I believe the intent was to "monitor both sides", but I agree with you - the zener voltages need to be changed accordingly.
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Old 20th August 2008, 04:12 AM   #23
LuigiDJ is offline LuigiDJ  Colombia
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Hi wine&dine, thank you, thought of that trick too, just wanted to make sure. What i'm not sure is: is still connected the same way the 310V and float points? Right now I'm reading the Marty Brown book (power supply cookbook), and will begin to calculate for my needs.

How about the feedback network? It's necessary to track both sides or just one of them?

Still reading...

Luigi
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Old 31st August 2008, 07:51 PM   #24
alex mm is offline alex mm  Romania
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Default PCB for SMPS +/-50V

Hi folks.

Another PCB variant http://freepdfhosting.com/3bb9b920ad.pdf not tested , but I hope to be good all the best alex mm
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Old 4th September 2008, 08:02 AM   #25
h_a is offline h_a  Europe
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Very nice! A SMPS for audio amps!

Unfortunately I don't have much understandings of a SMPS, but I'm interested in using one for a power amp.

Looking at the schematic I've the impression that one would just need to change the windings ratio on the transformer connecting the switching part to the outside world (the ETD59 core).

And as always I'm sure it's not as easy as that, so it would be great if somebody could point me to information about doing that - say I'm interested in +/- 25V rails?

By the way, what's the max output current of that SMPS?

Have fun, Hannes

PS: yes I'm scared by lethal voltages.
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