QCWSSTC Miniblocs Test 300khz 100VDC
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- เผยแพร่เมื่อ 12 พ.ค. 2024
- Swapped the Fuji 2MB1200U2F 1200V 200A bricks with these IXXN110N65B4H1 110A miniblocs. Was more difficult to route everything using those miniblocs but I think they'll be worth it. The total gate charge on one is the same as a 247 package 60N65 I like to use. Aside from the current capability they are otherwise fairly similar switches that take up less total space.
I had to rewind my GDT a few times trying different numbers of turns and tighter coupling in order to get a halfway decent waveform with 10 ohm gate resistors. Tidying up the wiring might further improve it but these gates were not liking that GDT. Or it could be something with the driver output I've yet to discover. I've had good enough luck with similar gate waveforms in the past so I'm just going to run with what I've got now.
The miniblocs will allow me to run higher frequency around 400khz whereas the bricks would probably start switching too crappy. Either way I'm pretty happy with the performance of those bricks at 300khz. They just seem like big dumb sturdy switches that can take a beating and still get the job done even if they aren't the most ideal. To be fair they are also pulls from industrial equipment so they are probably not like what someone might get off aliexpress. The miniblocs are not made for 400khz either, but they should at least be able to switch that fast without a lot of headache.
I'll have to put the smaller topload back on the coil to see if I can get it back up to around 350khz at least, then try to wind a primary that can utilize my MMC with enough parallel banks to make it beefy enough. Might end up with a lower L and higher C than I really want. - วิทยาศาสตร์และเทคโนโลยี
i could imagine this at 200vdc that would be insane
Bro, the way you're super chill talking about this stuff. I've dabbled with high voltage experiments before, and I really enjoyed your video. Not just enjoyed, I appreciated your video brother!
Thanks man. At first I used to mainly just see the utility for myself in recording what I'm doing, cause I'll forget.. but over time automatically tried to just document it so others can have yet another reference example also. A lot of great knowledge out there on the net but one of the main things I always really appreciated was just examples to look at in general.. I try to imagine the first person ever to mess with something like this and whether or not they had any idea whatsoever what the output should be looking like. The other examples out there let me know that with a certain amount of peak current I can expect much longer arcs than I'm getting now, which is pretty crazy. Like, I'd never have guessed.
That mmc bank looks legit I am sure that it will work amazing , you gotta fix the arching problem
I'm actually going to just turn this one up some more to see if the arcing problem persists. It may or may not. Either way I'm sure it's going to completely change when I use the primary LC. I always kind of plan for something and end up having to change it a little.. I'm hoping you're right and these caps hold up, but I've also used extremely undersized caps in DRSSTC's before and never really had much issues.
So I guess your issue might be different cause I don't think you have OCD but I noticed on mine that if I let OCD kick in a certain way then it causes the arcing.. It ends up breaking up the ramp in a way where it creates high frequency switching in the breaks, and the amount of capacitive coupling is just too great between L1 and L2. I don't think that's normal though and it's largely due to interference that shouldn't be there. Real good shielding is really important and it's one thing I slack on a lot.
@@Magneticitist Oh great so you figure out the arching , yeah mine does not have any kind of OCD , anyways I really should not turn mine up that high , at least till I can scope it or switch to a half bridge
@@Magneticitist that little jump before the jump that was showing up on your scope might be the wick on the ramp ?
@@rodriguezfranco3839 With yours my first guess would be interference at the arduino and PLL. It's actually probably the PLL chip. If you don't completely shield it there is going to be an issue with it detuning. Your pop does actually sound like the VCO going nuts for tiny bursts or something.
what core material are you using for your GDT and feedback transformers?
T37
Great work man.
I'm kind of sure you change some of codes on arduino
With 300 vdc i cant get arc tenths of yours. Mine is workind very weak .
And please show wiring qcw on drsstc it should have extra feed back .
Also please sometimes run the qcw with through hole mosfet or igbt
It's all Finn Hammer's original code. When I switch this to DRSSTC I'm just going to take that feedback CT and put it on the primary, that's all.
As for thruholes I already made 2 of those. One uses the double full bridge but the other is just a single full bridge. I'd have to see your whole setup to really get an idea of what the problem is.
I would be thankful. I'll set all together again and send it by email
Thnks for replying
How you get 100v dc power supply?
It's QCW that uses a buck converter on the front so it's a ramping voltage that reaches a 100VDC pk. I'm using a 20V drill battery supply I made which powers an inverter feeding a variac. That charges the DC bus on the front end buck converter.
@@Magneticitist ohh 😊