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Messages - justin66

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2
i have read about the chinise 1200v caps for induction cookers 0.33uf is a nice cap to use. now i will test them with more power as soon as i can figure out my problems with the bridge. the dawn caps i have seen and they should be good ones as well.

3
The 1200V 0.33uF induction cooker capacitors have worked quite well for me.  I don't use them above 1200V peak (+-1200V sine wave) in my DRSSTC.  I've abuse-tested a couple parts in simulated DRSSTC use (1% duty cycle bursts of 80kHz).  At +-1700V, they lasted a week continuous with no significant changes (no leakage current increase or capacitance decrease).  Tested the same parts for two more days at +-2000V, then finally fried them at +-2150V.  So, you might get away with +-1700V.  On the other hand, the two parts I tested to destruction may have been lucky.  With a large array, the weakest part drives maximum voltage.  That's why I stay <=1200V for actual DRSSTC use.

As long as you parallel three identical IGBT half-bridge parts for one side of the full-bridge, and the other three identical parts for the other half-bridge, I think you'll be OK.  The biggest difference I noticed in the spec. sheets is the typical current vs. gate-voltage curves.  One has significantly lower Vge for a given current.  Make sure your gate-drive is at least +-15V (or a bit more) to properly drive the higher-Vge part.
Thanks for reply. How do i calculate maximum voltage on my resonant circuit? I believe its dependent on the PW so im not sure how to measure or limit the maximum voltage. I have seen guys at kaizerelectronics make mmc with maximum of 4kvdc and provide a great results in terms of sparks.

Im using UD 2.7 so gdt 1:1 should provide somewhere close to 24v of drive voltage so i think im good on that part. The problem is that there will always be different igbts conducting in any given time because it conducts in an x patern.

Im still not sure about the maximum amperage that i can safely push igbts, maybe i dont need to use so much igbts? I have seen small to247 igbts capable of 200A in a zvs and only have 20A hard swich current so maybe 150A igbts can do 1.5kA?

I cant find a compatible industrial fiberoptics pair that can for sure talk to each other, what transmitter do you guys use for if-d95t to properly read signals?

4
hello guys, im very inexperienced in making DRSSTCs so i would like your opinion about my plans, it is my second DRSSTC first got about 20cm sparks with 40cm winding quite dissapointing considering 180a OCD it had 1000 turns...
now i have 1200v igbts that are rated 150A continuous i want about 600-900A primary current. so i got some igbts from a motor controller and i wonder if it would be safe to run similar but not identical igbts for a dual or tripple paralel full bridge configuration? and what about an overdrive there is no info about ZVS operation how far should i push my IGBTs ?
can you guys with more experience tell me if this would be a good configuration in terms of chosen wire size using javatc there is no indication what is good or not. my goal is 2 meter sparks, more is always better as long as secondary can handle it. :D
also the MMC im not sure about how much DCV i need to make it robust? i will use chineyseum induction cooker caps, i have read they are good for MMCs and also cheap
the GDT is one enough or i need to make more than one for more current?
i have seen people disabling OCP but where do i find info about my own IGBTs? black bricks have OCP
what is compatible IF-D95T transmitter part? because IF-E96E doesnt work


datasheets
https://www.fujielectric-europe.com/downloads/2MBI150VB-120-50_1734942.PDF
http://www.ic72.com/pdf_file/2/58778.pdf

5
The OCD at turn-on thing with the UD2.7 is caused by the UVLO IC. This design isn't the best (the UVLO stops working at very low voltages as it was just a quick hack based on what I had on hand at the time I implemented it, after which it was copied and added to the UD2.7 design), so I wouldn't sweat it as long as the driver actually works.
thanks for replying, i found the pesky problem, there is JP1 and JP2 jumper point that i totally forgot to install and short out after installing jumper near 9v buck regulator the ocd led turns on if i jump those, so i think its the one that turns on UVLO.

6
thanks Mads, i appreciate your work and answer. i will try fitting ST, hope its going to sort out, have a nice day.

7
The UD2.7C will light the power and OCD LEDs on power up until it receives feedback and an interrupter signal.

For testing without a proper interrupter, I've found a bright white LED flashlight will work in a pinch, shined directly into the ST fiber receiver.

It sounds like you have a problem with the board that always lights the signal LED sounds. That shouldn't happen. I'd double check you don't have any cold solder joints or bridged joints. Beyond that, I'd have to sit down and stare at the schematic for a few minutes to guess where the problem could be. Perhaps others will chime in.

Good news is it sounds like you have one good board. You can use that with your DMM and scope to compare against.
the driver works every way i test it but the OCD LED doesnt turn on when powered with out interupter.

8
[deleted irrelevant information]
basically when powering UD2.7c  the OCD and power led should be present. in my case OCD LED doesnt turn on. it only turns on when tripped. is it something to worry about?

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