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Messages - Hydron

Pages: [1] 2 3 ... 21
1
Also it might default to building the "Debug" binary - select "Release" version in the dropdown box before building the UART_LDR.

2
I've luckily already got a (very old - the version with the USB bug) TQFP board built up, plus a couple of QFN dev-boards to play with. I was planning on rolling my own board for a second controller - looks like I will need to use the devkit rather than just dropping the TQFP down.

As for the shortages, I unfortunately I know too well the difficulty of getting stuff at the moment - they are currently making my day job much more difficult than it should be.

3
It's certainly worth getting used to dealing with SMD - you'll be locked out of many parts otherwise, and (at least for larger pitch parts) SMDs can actually be quicker than dealing with THT, even for hand soldering.

The UD3 PCB doesn't use anything particularly challenging - the TQFP is the most likely to cause frustration, but a decent iron, some flux, good solder (make your life easier and go leaded) and some good solder braid should be all you need (mild magnification will help for inspection too).

RE errors - see attachment


4
I've been looking at the UD3 stuff again in the last few days (independently of this thread) and it looks like the QFN version is throwing errors when building - is it possibly out of date compared to the main TQFP target?

5
Looks fine to me. The odd waveform at the end of the trace is due to the energy in the tank circuit being transferred back into the DC bus capacitors via the anti-parallel diodes of the IGBTs.

Probably the more important question now is if it's making sparks :P

6
As far as failures go, I think you could do a lot worse!

7
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Parallel IGBJT
« on: July 14, 2021, 11:41:07 PM »
Good read, thanks for pointing it out. Also makes me think that I should maybe play around with double pulse tests too when playing with PCB design trying to tame transients, easier than having a coil running next to you during development!

8
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Parallel IGBJT
« on: July 14, 2021, 06:08:28 PM »
I was meaning picking parts with similar electrical characteristics.

In my comment about sharing switching losses I was mostly referring to being lucky (it would be a pain to measure dynamic characteristics), but you could try and do some loose matching of some DC characteristics, e.g. Vce(sat) of the IGBT or Vf of the diode.

I've never actually bothered trying to match IGBTs myself (the only parallel parts I've used have had forced current sharing using a split MMC), but If I were to have a go at it I'd clamp the devices to a heatsink to keep the temperature equal, and run say 10A through them, checking the forward voltage and/or the Vce(sat) (the latter would need to be at a fixed gate voltage) and just pick pairs that are closest to each other. Quite possibly not worth doing though - they may already be close enough to share usefully as is, especially if they're from the same batch or something.

9
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Parallel IGBJT
« on: July 14, 2021, 11:46:24 AM »
The rated Icm for a single part is already 180A, so 200-300A with a parallel pair should be fine, with the noted caveat about the diode.

Even if you have some uneven switching losses from the parallel parts (likely unless you're forcing current sharing or have a very good layout and luck with matching) it's still probably useful even if only to share a bit of the load on the diode (wouldn't hurt to try and match these a bit, and make sure they're thermally connected to try and equalise the die temp).

In my case one of the reasons I switched to a FGY75N60SMD is that the diode is much heftier - 0.48 K/W vs 1.1 K/W thermal resistance!

10
Electronic Circuits / Re: Counterfit Parts
« on: July 08, 2021, 01:28:26 PM »
As mentioned in my post on aliexpress FGY75N60s, I think I was at a large advantage due to the fact that the IGBTs were one of the cheaper parts available in "Power TO247" packages in the first place, reducing the options for faking them by re-labelling the cheapest thing they could find (though it doesn't stop other methods of cheating, like making fake parts from scratch). That was also a few years back, situation could have changed significantly since.

11
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Felix's DRSSTC
« on: June 22, 2021, 08:16:03 PM »
Very nice coil, at 16 I was fooling around with neon sign transformers and flyback drivers, not a DRSSTC (though they weren't really a thing at that point).

A couple of questions though...

- From the primary coil and MMC size, it "seems" like a higher impedance coil and thus I find the 70uS on-time for 1130Apeak a bit off, I did however not calculate this, its just a hunch from looking at the numbers :) It could suggest that its not tuned properly. The sweet spot is usually within 3-5cm, so moving the tap back and forth a 1/4 turn is too much for fine-tuning.
- Your MIDI interrupter is limited to what on-time? It seems like it is quite a stressful input to a DRSSTC, not much time between notes, if any :)
Is it hitting the OCD at 70uS though, or is that just the setpoint? My similarly specified coil does about the same spark length at a similar or slightly lower OCD setting (can't recall if I need to push beyond 70uS though when in upper pole tune though). I also didn't find too much of a sweet spot, didn't get a dramatic difference with 1/4 turn tap changes.

12
General Chat / Re: Why are SGT50T65FD1PN soo cheap on lcsc?
« on: June 10, 2021, 11:51:17 PM »
Micross have a few datasheets for die-only IGBTs, for example the following:
https://shop.micross.com/pdf/fairchild/igbt/FGY75N60SM_IGBT_DIE.pdf
You could easily work out the volume and thus mass of the silicon from the measurements given (doping can be ignored, just use the specific gravity of pure silicon). Note that this particular IGBT is rather thin (I believe due to the technology used). The equivalent packaged (with diode die as well) is the FGY75N60SMD, so you can compare with the info and thermal impedance graphs from the packaged part datasheet.
The "60A" datasheet is also available (https://shop.micross.com/pdf/fairchild/igbt/FGA60N65SM_IGBT_DIE.pdf) - I believe that this is basically the die used in the famous FGH60N60SMD (it seems to be the 650V "FGA" version, but that datasheet is almost identical to the 600V "FGH" version other than the voltage rating, so I suspect it's the same or very similar die).

On another note, the die size specs above (and judicious use of a belt sander) were very useful in checking whether my very cheap Aliexpress FGY75N60SMD IGBTs were legit - I have a thread on this elsewhere on the boards (the short version was that the die size exactly matched and they also tested/worked fine).

13
General Chat / Re: Photonicinduction is back!
« on: June 07, 2021, 10:22:00 PM »
The Home Office are gigantic bastards, he isn't wrong about that! Good to hear he's back in business.

14
General Chat / Re: The global semiconductor shortage...
« on: May 07, 2021, 12:40:33 AM »
I'm having a similar experience as Da_Stier (also automotive hardware, though thankfully without too many constraints as to using auto qualified parts). Sucks big time, am having to change parts in the middle of a design because the things I chose 2 weeks ago due to good availability are now unobtainium.

15
If EVR hasn't touched that part, then the original schematic is, like I said, on the page I linked. The actual PDF is here: http://classictesla.com/pslawinski/UD2%20CPLD.pdf

Would be very interesting to see the primary current waveform - that resistor does NOT look like it has dissipated anywhere near the power that it in theory it has (I'm amazed it's still in existence!).

16
Are there any PDF format (or image format such s JPG) files for the UD+ schematic?  EVR version would be great for your specific coil, or any UD+ version presuming it is close.  It would be handy to have that filed away in case other questions come up.
Software, schematic PDF, Altium SCH/PCB source and (I think) gerbers are all on the page I linked (sources hosted on github so you can just clone the repos). No idea if the EVR version uses <51R for feedback, I'd expect it to already be a smoking crater if it's not smaller than 51!

17
UD+ info is here:
http://classictesla.com/pslawinski/udplus.html

Looks like it is indeed 51R, if that's correct then it's running way past it's ratings, good catch!

18
Upgrade looks pretty nice!

Have you tried longer pulse widths (like 10+ms) and lower PRFs? Could change the character of the streamers quite a bit, and it seems like the coil is likely up to it (unless it pushes IGBT die delta-T too high) if you can run 17%+ duty cycle already.

19
NTCs _permanently_ in the circuit aren't ideal (especially for high power applications), but they are explicitly designed to deal with big inrush currents so can be (and often are) used with a bypass relay. A little annoying putting in the extra circuitry, but if you're already doing phase control etc then you have a low voltage supply, and a 555 timer or similar to switch the relay in would probably do the trick.

You may also find that there are off-the-shelf solutions available (probably using SCRs rather than triacs) that are affordable - search ebay for "scr power controller" or similar. Best would be to roll your own though, using SCRs for one leg of the bridge rectifier so that you get phase control and rectification done in one shot.

20
Current sense should be via a CT (current transformer), with no galvanic connection = already isolated. Use the same CT setup as you use for feedback except with 10 ohms or something across the output as a burden (measure the voltage across this with the scope, output will be input current * burden resistance / CT turns ratio).

You don't actually need to isolate the inverter to scope the voltage either (especially if it's a voltager double config with neutral feeding the capacitor centre-point), just scope from earth to the bridge output with a 100x probe and you'll see enough to tune the phase lead (output may be riding ontop of a mains voltage however, depending on the rectifier setup).

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