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Old 22nd January 2012, 12:29 PM   #21
Frex is offline Frex  France
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Hello,

To understand more easily and more faster the overall EPSUX3 structure, i've draw a simplified synoptic.
It show only functional blocks, that you can find on schematic for more details.
Regards.

EPSUX3V1 Synoptic.


Frex.
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Old 22nd January 2012, 05:06 PM   #22
carpin is offline carpin  Netherlands
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Looks good Frex.

Click the image to open in full size.

Question, why did you design the flyback transformer? because the three outputs? or better specifications, quality?

And the enclosure don't need a small cooling vent?

Last edited by carpin; 22nd January 2012 at 05:10 PM.
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Old 22nd January 2012, 07:01 PM   #23
Frex is offline Frex  France
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Hello Carpin,

I design the transformer because you can't find already build transformer with your own specs !
Designing and building it is not a big problem for me.
I don't think that the case will need a fan. The enclosure is in extruded aluminium and it's thermal impedance is good.
Of course, only final tests at maximal power will verify this.
Regards.

Frex
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Old 27th January 2012, 06:25 PM   #24
Frex is offline Frex  France
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Hello,

The full design is well advanced and the flyback transformer is now soldered and tested on the final board, and fully functional.

I have done many tests on the flyback, including measurements of efficiency vs Pout and vs Vline.
I have tested the short circuit and open loop conditions and thermal behaviour of power parts.
I will post complete graphs results tomorrow.

Some little modifications has been done (parts values) to optimise it.

Front panel is now also drilled.
You can show the design progression on pictures below.

Frex


Click the image to open in full size.

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Old 28th January 2012, 11:26 AM   #25
Frex is offline Frex  France
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Post Flyback results.

As promised, some result charts being made on the flyback alone.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Frex.
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Old 28th January 2012, 04:15 PM   #26
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Nice work! Superbly professional.

Any ripple vs load and voltage deviation vs step load measurements?
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Old 28th January 2012, 04:22 PM   #27
Frex is offline Frex  France
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Hi Tazzz,

Thank you for your comments.
These measurements are made on the flyback outputs, not final PSU outputs.
But yes, i will perform others measurements on the real PSU outputs, like ripple voltage and a 0.5A/1.5A load step transient response.
That's not yet finished !

FRex
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Old 30th January 2012, 04:08 PM   #28
carpin is offline carpin  Netherlands
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Good specs

No usb port for logging?
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Old 10th February 2012, 06:10 PM   #29
Frex is offline Frex  France
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Hi all,

The PSU project is still in progress. The front panel has been drilled.
No big issue has been encountered during mechanical mount.
The green plexiglass of the leds displays is too dark, i must find another.

I've also started to do some quick noise measurements, that show about 20 mV with
a purely sinusoidal profile.
I must d build a serious measurement setup to do these measurements with good confidence.

Frex
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Old 11th February 2012, 06:09 PM   #30
Frex is offline Frex  France
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Hello,

Some pictures of how it looks like now.

Frex

(it's an AA battery at left for size comparison)
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