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ok so now the coil dosnt work I put a feraday shield around the coil, and it worked great, but then I was messing with one shot pulses at full power, and I blew up all the IGBTs. this I think happened because the over current couldn't kick in in time. I replaced everything and now I only get 1" sparks at full power I think this is because it dosnt have the ossilation frequency from the CT I caint check this because I caint operate a scope that close to the primary. I replaced every part except the transformers and everything looks right, it only looks like the coil is running way off fres. What cain I do to fix this I need it running for a demonstration I am giving in a week and a half!
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
I would test the circuit with signal generator.. and not be so rushy with full power. If you didn't touch anything, replaced the IGBT's and it doesn't work, something else is blown. I suspect the zener diodes on your CT.
I just tested and when I unplug the CT I get nothing so there is an ossilation being sent through it. The clamping diodes and zeners look good from a diode test. so I caint think of anything alse that would reduce performance so drastically. the caps would have shown some form of damage on the MMC if they failed, or shorted. I will test the capacitance soon when I have the toles.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
the caps would have shown some form of damage on the MMC if they failed, or shorted. I will test the capacitance soon when I have the toles.
Actually, the capacitors will not show any signs of damage even with they are completely failed. Its very rare to blow up an MMC to show physical damage... all of mine look just fine on the outside.
do you have any idea what could have failed though because I checked the voltage across the caps after putting voltage across them and it retained it well and all of them shard the load.
so I tested the MMC today and I got a reading of 406 nf fairly close to my 400 nf I wanted. So this isnt the problem what can cause this degradation in performance?
ok so I now have some better debugging equipment, and I tested the frequency with no power to the brige. the modulator signal red 160Hz, the signal off the CT was 260Hz and the signal at the GDT was 260 Hz this isnt right. the signal off the CT should be around 60khz and the capacitance is right, and everything alse semes to be in order what can lower the frequency like that?
edit
I re tested the frequency of the CT with the coil on and it read 6.2Khz that is 1/10 the fres of the coil indicating a dramatic drop of fres of the secondary. the energy transfer would also be much lower at this fres this could be the problem, but I dont know how to fix it. or what the problem could be.
Registered Member #154
Joined: Sun Feb 12 2006, 04:28PM
Location: Westmidlands, UK
Posts: 260
When stripping your electronics down to replace faulty components, have you reversed any conections to or from your driver board? eg... have you reversed your CT leads to your driver board? or reversed your primary conections to your GDT? this would revese your phase and cause problems.
I have tryed to reverse the connections and it dosnt work, I did though find that the signal from the CT dissapiers between the F-F and the gate drivers. I see the signal at the resistor into the FF but I caint finde it.
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My first DRSSTC
