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Hi all, I am going to finish my first big drsstc using IGBT bricks, and i want to make sure everithing is done right. Whole setup is made exactly according to these combinated steve's schemes below, (i wasnt able to build UD.1 or 2 for many reasons...) My choices are to use one of these two halfbridge IGBTs: CM300DY-24NF or BSM75BG120DN2, the bus voltage will be doubled to about 520VDC, it will all run at about 70-80 kHz, wich IGBT will be better for my setup? Also i want from you guys, to look at the schemes, design and let me know if is OK to run this coil.
Hi Goodchild, thx for your opinion, and what do you think about schemes, there are several unusual things like:
the supply voltage of UCCs and OCD section is 15V (against UD1,2 there is 9V) 24V zener diodes on IGBT gates 1,5uF/1000V IGBT snubber capacitor 8:8:8 turn GDT
would you thing some of these can be a problem ? /i'm asking that because these parameters are not so common as most of you uses/
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
That all looks ok to me, I like to use at least 10 turns on my GDT and usually 30v TVS on the gates, the 24V zeners I can see kinda clipping the drive signal because of it being right at 24V, but that not to big of a deal.
And one last thing, you don't really need the TVS across the bus, they don't really do much if you have a good bus layout and snubbers.
Registered Member #154
Joined: Sun Feb 12 2006, 04:28PM
Location: Westmidlands, UK
Posts: 260
mmt wrote ...
the supply voltage of UCCs and OCD section is 15V (against UD1,2 there is 9V)
I would supply your UCCs with 9 volts. Steve chose 9 volt drive for a reason, he had problems with other voltages. He stated this as an answer to a similar question....
"Ive had this P/N driver work OK with fairly different P and N fets. I found that the drive voltage for them was fairly sensitive, and that lower drive voltage (lower than the 9V i suggest) can sometimes help avoid cross-conduction even better."
Registered Member #2922
Joined: Sun Jun 13 2010, 12:08AM
Location:
Posts: 226
Are you testing with all together? bridge, primary tank.... if yes, try to reverse the fb, primary.. try all configurations.. if not, your circuit will not oscillate with note a feedback signal, put a 3v square wave using a function generator
thx for reply, Yes, i was testing all together and alredy tried to change feedback polarity.
So I put on FB IN some square wave and finally get something usefull on IGBT Gates. But of course i want to run my coil from a primary feedback, so where else could be a problem?
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Brick DRSSTC final check
