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Old 29th April 2013, 05:58 PM   #401
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Quote:
Originally Posted by ChocoHolic View Post
Hi vovatver,
you will need patience,...
I will wait humbly
... and i try to repeat Your feat.
I was hoping that You had a stage of Your project, when You said to yourself -
ok! this is the best that can make my half-bridge! and it is time to tell it about "Errors" by loop-back.

Ambitious project that You have already done - is worthy of admiration.
Thank You for the pleasure of seeing Your research.
I hope, that soon I will be able not only to strain You by questions,
but to say something on the merits.
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Old 29th April 2013, 07:19 PM   #402
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Edit1:
@Reactance

Yeah - soft soaping
...feeling better again...
UcD is hard to beat in terms of simplicity. Well, bender's version is already pretty grown up with lots of additional components, but they all should be easily available and low cost - valid point.

I cannot comment on the Arnold cores, never used them and never had a detail check through their data sheets. 'Less famous' is not automatically bad.

Enjoy your DSP !



Edit2
@vovatver:
If I have time - yes, I do optimize THD in open loop situation for curiosity and then close the loop.
But up to now this open design was definitely a project which I pressed to bring it to a reasonable level within short time.
The more relaxed time of tweaking derivative version(s?) will start this summer.

Last edited by ChocoHolic; 29th April 2013 at 07:34 PM. Reason: adressing the answers
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Old 29th April 2013, 07:47 PM   #403
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Nobody complaining?
...it is self oscillating and won't operate in open loop...
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Old 29th April 2013, 09:23 PM   #404
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Quote:
Originally Posted by vovatver View Post
... and i try to repeat Your feat.
....
I hope, that soon I will be able not only to strain You by questions,
but to say something on the merits.
You are going to build?
Please make sure to use the instruction set in the BOM of posting #329 (page 33), not the earlier one!
Let us see how things are going, and when struggling or something in the builders pack might be unclear, please let me know.
Thread or PM - both is fine.
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Old 30th April 2013, 05:21 AM   #405
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Quote:
Originally Posted by ChocoHolic View Post
Nobody complaining?
...it is self oscillating and won't operate in open loop...
ooops...
right you are...

The problem is simplified))))
I need to clone only SystemD_2k4_Power of your project
and use my XMOS-PWM modulator with counter frequency 500MHz)))
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Old 30th April 2013, 05:00 PM   #406
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500MHz ! ...sounding like you will need a 10bit frequency divider...
The power stage of SystemD_2k4 is fine for 500kHz, but you will have higher losses.
THD typically also increases with frequency (except you can win inversely more loop gain), because dead time distortion is a function of the ratio of dead time by period.
Keep us updated
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Old 6th May 2013, 09:20 AM   #407
luka is offline luka  Slovenia
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Location: in Slovenia :)
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Something new for rainy days

Thanks Markus
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Old 6th May 2013, 07:16 PM   #408
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Old 9th May 2013, 07:44 PM   #409
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Quote:
Originally Posted by vovatver View Post
I need to clone only SystemD_2k4_Power of your project
and use my XMOS-PWM modulator with counter frequency 500MHz)))
Welcome to XMOS | XMOS
Which resolution in time domain do you target for your PWM from the XMOS?
Also intending a digital feedback? Postfilter feedback?
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Old 17th May 2013, 07:26 AM   #410
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Quote:
Originally Posted by ChocoHolic View Post
Welcome to XMOS | XMOS
Which resolution in time domain do you target for your PWM from the XMOS?
Timestep = 2nS
Quote:
Also intending a digital feedback? Postfilter feedback?
Today - without FB absolutely.
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