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Registered Member #1732
Joined: Thu Oct 02 2008, 02:34PM
Location: Huntsville, AL
Posts: 112
Steve Ward and I have created a new UD ... I call it the UD+ This is actually a rather old project. Steve finished his part (Schematic) back in 2013. I did the layout back then, but never got around to doing anything with the boards after they were ordered. It wasn't very interesting considering I had access to the UD3. I decided to dig up the project two weeks ago, so I started writing VHDL, and now it's working.
Features:
UVLO
Adjustable Pulse Width Limiter (can be disabled via dip switch)
OCD or Freewheeling (selected via dip switch)
Over-temp Lockout
Startup oscillator (with configurable number of startup cycles [1-32] via dip switch)
ST Fiber or bare fiber
Phase lead
24VDC Input or AC input (similar to UD2)
Phase inversion (like the phase jumpers on UD2) via dip switch
This image is just to give an idea of what the board will look like. The board would be respun to fix errors in the first run, and update some things since it's been three years since this was made. The board that I assembled is super ugly because I had to do some kludge fixes to get it going, all that will be fixed, of course.
Here's a crappy video I made to demo the freewheeling:
I'm posting this here to see if anybody is interested in having one of these drivers. I'm thinking I'd probably sell boards with programmed CPLDs (or if you want to get your own programmer I'll make the VHDL available.)
So if there is any interest in this thing, I'll re-spin it and print boards. If not ... at least it was a fun project for a week.
Registered Member #30656
Joined: Tue Jul 30 2013, 02:40AM
Location: UK
Posts: 208
Hi Phillip,
If you're willing to share the schematic/VHDL (especially the latter) then that would be extremely useful to me. I'm in the middle of hacking up an existing controller board to add some programmable logic to it (right now a FPGA on a dev board, but probably going to be a CPLD if I lay out a custom PCB for my coil) and would be great to have some working reference code to get started with.
This is a great project for the community; it's been pretty obvious for a while that the UD2.x type driver would be much more flexible with the addition of programmable logic, even if it brings the pain of needing a programmer. I actually drew up a quick hack way in another thread recently to add freewheeling to a UD2.x, but with another 4 logic chips it's not an elegant solution, hence why I was going to go the programmable logic route myself.
Registered Member #1732
Joined: Thu Oct 02 2008, 02:34PM
Location: Huntsville, AL
Posts: 112
Hydron wrote ...
Hi Phillip,
If you're willing to share the schematic/VHDL (especially the latter) then that would be extremely useful to me. I'm in the middle of hacking up an existing controller board to add some programmable logic to it (right now a FPGA on a dev board, but probably going to be a CPLD if I lay out a custom PCB for my coil) and would be great to have some working reference code to get started with.
This is a great project for the community; it's been pretty obvious for a while that the UD2.x type driver would be much more flexible with the addition of programmable logic, even if it brings the pain of needing a programmer. I actually drew up a quick hack way in another thread recently to add freewheeling to a UD2.x, but with another 4 logic chips it's not an elegant solution, hence why I was going to go the programmable logic route myself.
Hydron,
Your post is what reminded me of the board I had done.
I'll be putting the whole project on GitHub once it's ready. The PCB project was done in Altium (not Eagle, sorry.) Hopefully the PCB will not be needing much change. And because the board has a CPLD, the logic can be changed quite easily with a programmer.
PM me your e-mail address if you'd like an advance copy of the VHDL. If you'd like the schematic I'll happily send that along as well, but it's really quite similar to the UD2, all the "magic" is in that little CPLD.
I'm sure you know this, but it's probably best to avoid FPGA for the final board for the reason that FPGAs generally require some initialization after power on, whereas with a CPLD the configuration is stable from power up.
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Allthough I am working, with the left hand, on applying Hydrons UD2.7 pulse skipping mod, and feel compelled to finish it, I am also interested in supporting these new boards. Put me up for a couple.
Registered Member #30656
Joined: Tue Jul 30 2013, 02:40AM
Location: UK
Posts: 208
I think it's good for people to be trying it both ways.
The CPLD solution that Phillip is working on is the most elegant way to go, but if the discrete logic method also works then I think it would be good to have both options, as some people may find it hard or expensive to get a CPLD and/or programmer.
Registered Member #1732
Joined: Thu Oct 02 2008, 02:34PM
Location: Huntsville, AL
Posts: 112
Hydron wrote ...
I think it's good for people to be trying it both ways.
The CPLD solution that Phillip is working on is the most elegant way to go, but if the discrete logic method also works then I think it would be good to have both options, as some people may find it hard or expensive to get a CPLD and/or programmer.
Agreed. It is nice to have both versions. Using the discrete logic chips means that you "program" the board with a soldering iron, so it's ready to go as soon as it's assembled. On the other hand, while the CPLD adds another step, it affords far greater flexibility. You can make the board to do something completely different by simply changing the programming of the CPLD.
For the initial offering I'm going to try and offer programmed CPLDs to people who want them. I already have a TQFP44 ZIF socket, which hopefully I can wire up to program the CPLD without having to install it on the board. If not, I can just solder the CPLD to the board and provide power via the programming cable.
Registered Member #1732
Joined: Thu Oct 02 2008, 02:34PM
Location: Huntsville, AL
Posts: 112
So the re-spin is pretty much done now. Just a few little things to wrap up. Here's what the new board looks like.
Most of the changes are power related. I've replaced the LDOs for 3.3V and 5V with switching supplies. I've changed the 24V regulator to a D2PAK, and added load options for DC input (with polarity protection).
I also have made a "special" footprint for the inductor. I still have a few of the "OG" inductors that Steve spec'd for the UD2.0 waaaay back in 2009, and I don't have any desire to get the new slot 7. That said, I had a request to accommodate the slot 7, so I've made a sort of compromise. The inductor slots are sized to accommodate the pin receptacles used on the UD2.7.
This board is designed to work with XC2C64A CPLD, instead of the XC9572XL. Also ... I have testpoints peppered all over the board, so debugging should be a little easier.
I think I'll probably have boards printed in a week or two. If there are any suggestions, let me know.
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UD+ a new Universal Driver (now with Freewheeling)
