UD2.7 onwards - post-2014 changes published anywhere?

[AkashaStar]

If anyone could point to where schematics for versions of UD2.x post-2014, I'd be interested to  dig in.  I don't mean the change of tactics with UD3 --aware of Netzpfuscher's and other's work -- but somewhere in its evolution before coding became involved.

I know Lone Oceans (Gao Guangyan) catalogued 2.7C very comprehensively in 2014; that seems to be the last open-source work on late 2.7+
 pre-UD3.x versions. He noted  the contributions of Eric Goodchild & Bart Anderson through the evolution from Steve Ward's foundation design, as well as his own.

Someone I was in comms with sent me photos of a post-2014 board a few years ago.  I never found out the provenance of it & we have lost touch.  Among other differences from 2.7C, I did find a note from visual inspection --

*Shorting jack for phase lead adjustment eliminated
*C33 in D2.7 (part of hysteresis loop for TL3116) becomes C25 in this later version
*Chassis-mounted LED's become part of board population
*PCB was built for the two channels (logic and gate drivers) but board wasn't redesigned, simply entire CH2 left unpopulated
*Overcurrent pots. mounted vertically on PCB

I can't see there was any substantive possible improvement from 2.7C, so I'm curious what was actually done that isn't cosmetic in 2.7+ versions  Were there any known glitches remaining after 2.7C?

[Mads Barnkob]

Did you check out the prof9dc PCB pack? It has UD2.7 and UD2.9 (pulse skipping)

https://highvoltageforum.net/index.php?topic=353.0

[davekni]

Besides UD2.9, there are at least two other pulse-skip offshoots of UD2.7 that use simple logic chips:
https://highvoltageforum.net/index.php?topic=2054.msg15611#msg15611
https://highvoltageforum.net/index.php?topic=2265.msg16555#msg16555
Not certain if that is exactly what you are looking for.

[AkashaStar]

Mads, yes, great resource there.  Seems like there’s a big jump shift of approach  between 2.7x and 3.  I think I’m probably looking at a place of record for subtle 2.8ish revisions.  Things seems to have been jazzed up  in what looks like a significant way on that path.  Great to see what happens when imagination meets EE- where will we go next?

Dave, pulse skipping,2.9 looks really interesting and I wasn’t aware. Will dig in and see if I can retrofit .

Thanks both