| mahmood |
Hi boys :
this is my first switch mode power supply . i want to share
it for you . :smash: :smash: :smash: :smash: |
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| guitar_joe |
looks alright
how does it perform? |
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| mahmood |
| the both side is here . |
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| mahmood |
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 .:D :D :D :D |
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| S.G. Mahbub |
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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| ravslanka |
hi mahmood
what is its power rating and can irfp450 be usedin place of 460 |
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| annex666 |
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. :D |
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| sawreyrw |
S.G. Mahbub,
What's wrong with the low voltage bias supply? Do you have a better solution that is more cost ($, space, weight, reliable) effective.
Rick |
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| annex666 |
| quote: | Originally posted by sawreyrw
S.G. Mahbub,
What's wrong with the low voltage bias supply? Do you have a better solution that is more cost ($, space, weight, reliable) effective.
Rick |
See my above answer (posted a few moments before yours) ;) |
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| 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 |
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| annex666 |
| 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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| luka |
| 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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| LuigiDJ |
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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| Samuel Jayaraj |
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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| wine&dine |
| 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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| 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 |
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| dudaindc |
| 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 |
:scratch: 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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| LuigiDJ |
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... :D
Luigi |
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| h_a |
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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| luka |
| quote: | Originally posted by h_a
Very nice! A SMPS for audio amps!
By the way, what's the max output current of that SMPS?
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in theory there is none, in real life, is as much as parts can handle and depend on them
;) |
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| h_a |
Thanks for the reply, but I would be interested in the max output current for the parts used in the schematic!
Have fun, Hannes |
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| luka |
Hi
How much would you need? |
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| h_a |
10 A peak would be nice; of course I would use a regulator after the SMPS which can handle 8A.
The reason for the low rails (+/-25V) is the balanced topology, so in fact the speaker sees +/- 50 V maximum.
Have fun, Hannes
By the way, Ljubljana is a very nice city! Been there often, especially in Krizanke. |
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| luka |
Hi
You don't need regulators, as you can make it regulated suppy..I think it can do this, probably first liniting component is too small trafo, but you should have problems with that. Other is somewhat correct winding of trafo...anything else is easy, really easy. Chech my site to get some idea what to expect or need, maybe you will find something useful |
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| h_a |
Thanks for your help!!
A regulator after the SMPS seems a good idea as I regularly hear that SMPS have a lot of noise on the output rails, especially at high frequencies. Sure a regulator would get rid of at least a part of that.
What about pcb-layout?
In general pcb-layout seems critical; however here ICs do the PWM, so my impression is that in this special case the layout is not more critical than for other circuits- true?
Have fun, Hannes |
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| luka |
Hi
Regulators won't regulate noise away, only good output filter of smps will minimize it as much as possible. I had no noise problems...
As for layout goes, apart from all the safetys you should take, it is pretty straightforward, you place element as you want them then start connecting, put them in groups or something, like primary side (caps and fets are near each other, so is trafo and so on), then secondary,.. Or copy someoes design and change something if you wouldn't like
| quote: | | In general pcb-layout seems critical; however here ICs do the PWM, so my impression is that in this special case the layout is not more critical than for other circuits- true? |
So far I have found layout to be critical only in swithching amps, because of sensitive input circuit and high freq./high current output...if not done right you can have problems...but I didn't have this with any smps |
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| Eva |
| If a SMPS is leaking RF to the outputs, no linear regulator will solve the problem, it may make it worse if you manage to add more RF resonances (pass transistor capacitances plus layout inductances). The SMPS has to be designed to be quiet. |
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| dudaindc |
Hi Alex mm
Another nice board layout...
Do you mind sharing the PCB files? I am thinking about prototyping your board in the near future. The plan is to use this SMPS to power the DX HR Turbo.
Thanks! |
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| Eva |
| Be very careful, there is no primary side to secondary side clearance on that PCB layout. At least 5mm are recommended. |
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| Eva |
| The negative output rail is not connected to the diodes properly either. |
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| h_a |
| quote: | | The SMPS has to be designed to be quiet. |
Hi Eva,
that's exactly the problem. Finding a schematic, ideally with board layout (in my needed size :D ) of a proven, quiet SMPS. So one of yours would be nice.
I've been looking for quite some time for such a thing, but usually it's not fully tested or it has tons of features I don't need (that I would need to strip from the board-layout) or is overkill power wise. Or uses a non-standard core so that one cannot clone it.
Or do you guys know a proven, quiet 300-400W SMPS for symmetric rails?
I would be interested to drop the usual transformer-psu and use such a thing for my power amp :) Just for sake of doing something more interesting.
Any links appreciated!
Have fun, Hannes |
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| h_a |
By the way, why's that SMPS-board that large? It's larger than a 300W transformer?
Why does it use 2x 470uF/400V caps? These don't exist on the schematic?
I suppose they replace the 4x 600uF/200V caps? I can't see the need for 400V parts here.
Guys, be aware that the layout is not 1:1 identical to the schematic.
Have fun, Hannes |
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