Triple outputs 100W Laboratory PSU -- A new DIY project . - Page 2 - diyAudio
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Old 13th December 2011, 05:42 AM   #11
Frex is offline Frex  France
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Hello,

I work hard on the PLD program writing, about 75% of the job is done now...
The voltmeters works fine.
I will post another demo video when PLD will be ready.
And happy to see you here Carpin !

Frex
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Old 26th December 2011, 03:22 PM   #12
6M9 is offline 6M9
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Hi Frex,
Very professional looking design,
It's clear that you have put a lot of effort in designing this PSU.
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Old 26th December 2011, 06:34 PM   #13
Frex is offline Frex  France
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Hello,

Thank you 6M9, i just try to build PSU that fit well for my need with my own user feedback.

The CPLD program is now ok at 99%, i just need to use the internal EEPROM for record the last U/I settings for restoring these values at next strart-up.
As soon it's ok, i start to build the tranformer and test the flyback converter.
Some pictures or video will come...

Frex
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Old 30th December 2011, 07:36 PM   #14
Frex is offline Frex  France
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Hello,

As promised, a small video that present how work the EPSUX3 now.
Good watching !
To follow...

Frex.
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Old 30th December 2011, 08:39 PM   #15
carpin is offline carpin  Netherlands
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Frex I can not watch the video.
It says

This video is private.
Sorry about that.
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Old 31st December 2011, 06:38 AM   #16
Frex is offline Frex  France
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Sorry,
problem solved.
--> Video

Frex
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Old 1st January 2012, 04:10 PM   #17
carpin is offline carpin  Netherlands
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Looks good Frex, I like the one knob adjustment and the green/red over current indication.

Are you waiting for the transformer? i see a empty space on the PSU board.
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Old 1st January 2012, 04:25 PM   #18
Frex is offline Frex  France
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Hello Carpin,

About the flyback transformer, i will build it in next week.

Frex
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Old 16th January 2012, 04:22 PM   #19
Frex is offline Frex  France
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Hi,

The flyback transformer prototype has been wound.
I test it's "real life" specs in the week with an "on the fly" test board.
The primary is split in 2 for lower leakage, and secondary windings are
winding at same time for maximum coupling.
I use Litz wires for secondary, but multiple small wire could work too.
In/out parasitic capacitances are neutralized with two copper shields between primary/secondary sides.
The shunt copper layer outside the transformer core that reduce radiated EMI will be added only
at the end( transfomer fully characterised).

Frex.

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 21st January 2012, 11:57 AM   #20
Frex is offline Frex  France
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Arrow PSU resonant flyback of EPSUX3 first tests!

Hello,

I have made many tests with the prototype transformer and first results are very good.
I reach the full output power of 115W without problem at expected switching frequency with an overall efficiency of about 85%.

The "on the fly" circuit board for testing the transformer looks like this :
Click the image to open in full size.

You can see below the voltage waveform at the Drain of primary switch(green),
that showing the turn-on near 0V confirming ZVS. The output voltage of one of the three outputs is in yellow.
Click the image to open in full size.

Here, it's the start-up sequence (yellow= output voltage, green Vds primary switch):
Click the image to open in full size.

No excessive heat has been observed during max output power for long time, confirming
good transformer design.

I will now made several tests on it to define efficiency and loss charts, test it in short circuit condition, open loop and more. I will do also losses map.
all results will be posted.

I recall that the scheme is available HERE.

The old video demo of the front panel in working of EPSUX3 can been see HERE.

Comments welcome !

FRex

Last edited by Frex; 21st January 2012 at 12:00 PM.
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