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I know I haven't posted in a long time here and just to update everyone I have just finished my latest DRSSTC and it is incredible, full bridge with bricks, and very clean design. I will post pics in the project thread soon, but I have reached my limit for inside testing ruining the system enough to destroy my secondary, this time I wrapped it in a insulating film and highly decoupled it, still I get easy 60" white hot arcs to the sealing...for some odd reason they cause the treadmill in the other room to turn on lol I wounder if its triggering the control electronics to overload load turn on. but for now I have a question.
After transferring my DRSSTC OCD controller from a different coil to this one, I realized it needs the interrupter to be set to a high duty cycle and pulse rate before the UCC gate drivers start to sent the signal out. I have replaced them and checked the signal trace, and found no problems, so I was wondering if anyone one knew of this type of problem. It seams to be almost like a ramp type of problem, it takes a capacitive charge of a greater duty cycle interrupter signal to start the output, and this didn't occur before. Once you start the oscillation, it can be lowered and modulated however you want, eg musical, I am having fun with this too every day :P
Just to inform you how I drive the bricks...I am first after the first pair of UCC's on the board I have a set of inverting UCC's and then a full bridge of high current mosfets driving a large ferrite core (GDT) at 24V in a 1: 1:1:1:1 ratio or turns, it works very well, and its an easy mod to an existing OCD driver, if you are interested in driving a brick. ( I am using 2x 600V 150A ultra fast Ferchild new half bridge bricks)
oh and by the way here is the picture of it running. the current limit is limiting it from running at full power but it is preforming fairly well. and sorry about the double post, I needed to upload the pic.
Registered Member #1741
Joined: Sat Oct 04 2008, 02:45AM
Location: Schenectady, NY
Posts: 35
Something like this happened to me. It was a little different - it wouldn't start oscillating - but when it did it ran fine.
In my case it was the preset to clear timing being wrong on the flip-flop. I ended up adding 2 more Schmitt triggers and adding a second RC network to make sure there was a enough time and things were controlled fully.
I dunno what schematic you have used - but I found the single RC circuit for preset and clear is too much hard to size optimally for a wide range of power. The initial condition on the capacitor was holding the LS109 in clear for some time too long.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Im having a hard time understanding the problem you guys have, can you confirm what schematic you are using? As far as i know, there are no race conditions as long as the RC time constant is set fairly long (really, it could be set for like 500uS and work with basically any DRSSTC down to the low khz range of resonant frequency). I do not find the need to tweak this circuit for all of the various power/resonant frequency ranges that i use.
BTW, Danielle, do you know for sure what is in your ceiling? Seems rather risky to let those sparks hit the drywall. Ive inadvertently started fires from letting tesla coils do stuff like that... at least tape some aluminum foil to the ceiling and ground it!
Thanks for the advice, but for some reason, now I am having a different problem and now it doesn't work at all. The signal from the inverted output is oscillating every other cycle, I replaced all the parts, but still have this problem, what would cause this.... I haven't replaced the IGBT's but those are large bricks, and they look in-tacked.
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Ramp/Charge start up delay problem with DRSSTC OCD driver
