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Looks like you got everything up and running well. I've used those Aerovox capacitors before and they seem to do just fine in DRSSTC use. Most snubber capacitors are usually good choices as well due to their high dv/dt ratings and low inductance construction. Good find on the bus caps as well but you'd still want more for a big coil.
I don't know what EVR's driver is like but make sure it can handle the drive capability for the CM600 bridge. I suppose it's essentially the same as the UD2x driver?
Registered Member #1521
Joined: Thu Jun 05 2008, 10:46AM
Location: Hungary
Posts: 128
Wolfram told me about these capacitors and these were the cheapest and best choice right now. I saw someone used large GTO snubbers, those looks even better (gto snubber), but the new ones are really expensive. The EVR driver has a maximum of 20A gate drive current capability. It has a dual UCC27423 + FDD8424H p- and n-channel half bridge as a GDT output.
Registered Member #30656
Joined: Tue Jul 30 2013, 02:40AM
Location: UK
Posts: 208
I used the Aerovox caps also with great success. Ran 2 parallel strings of 16-24 caps (depending on how i had the tank impedance setup). At 1-2kW I had them running for >10 min straight without any detectable heating (was testing the bridge by induction cooking eggs in a frypan).
If you got them from ctr surplus they also chucked a few extras in for me as well. Mine were shipped internationally (via a freight forwarder) but ctr knew I was doing this and packed them very well - cost a bit extra in shipping but they were all perfect.
Registered Member #1521
Joined: Thu Jun 05 2008, 10:46AM
Location: Hungary
Posts: 128
I coiled the first resonator coil. I coated it with PU as it dries very fast unlike the epoxy resin I have. I made a little coiling machine from my lathe. It's useful for big coils like this. Video
Registered Member #1521
Joined: Thu Jun 05 2008, 10:46AM
Location: Hungary
Posts: 128
A question: where should I set the pulse width lockout in the driver? As I understand, PW isn't a major problem, unless there is no load to the primary circuit (no spark at the output), but if this occurs the OCD will act and skip a few periods of the ringing. Or the question more likely, how important is the setting of the PW lockout?
Other stuff: I realised that the modulator doesn't have any fiber optic transmitter so I bought one from ebay and it works now perfectly with the controller. And a little criticism about the controller: the inner stabilizers (7824, 7809, 7805) are surrounded by the only heat sensitive elements, all the electrolytic capacitors without any space. More problem, that the 7805 is connected directly to the unstabilized 24V, so it's so hot, it burned my finger literally and I'm not sure how the 7824 will handle the current to the gate driver. I fixed a heatsink to the 7805 and 7824, but I think I should remove them from the PCB and attach all these to a large heatsink and wire them back to the PCB.
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ÊŽ/2 DRSSTC
