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Re: Terry's DRSSTC - 6000 BPS >:o)



Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Gerry,

At 11:55 PM 5/1/2005, you wrote:
Hi Terry,

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

It seems that each bang just "adds" to the next. I don't mean like a streamer follows the path from the last bang. It is like the T1 time is just stretched out. The T2 times seem to get lost and the streamer builds like it was just one long T1 time.

What is the advantage in 25 bangs in a burst vs having one bang where T1 is 25 times longer.

After about 15 bangs, the sparks just get thicker and hotter rather than longer. In my case, I am thinking having all the interruptions in there is helping streamer length. If it were true CW, the streamers would only be like a 5 inch brush... The interruptions seem to be the key to long streamer length.


I would think the thermal time constant is longer than a burst period. Could it be the smoothing effects that would have on the main bus ripple.

You can tell if the buss is being loaded down from the primary current. Right now, at 100 amps peak, that is not an issue.


Maybe there is a current issue, if so, how long can T1 be for a single shot before overcurrent is an issue???

The current will "top out" at about 200 amps with a streamer load when the input power and streamer power are equal. But higher BPS rates make the total power higher.


I guess I'm thinking if the IGBTs and controller could take it, what would happen if T1 were like infinite??

"Just" a CW coil...



I had to keep lowering the T1 time to keep the streamers at a sane length!!

When you vary something else??

As I raised BPS. I fixed the program a little so that works smoother now.



I worry about where the IGBT load is at. The current should be low and the heating should be low...

What is the concern if the IGBT's are over current and thermal protected???

They could heat "very fast" blow before the temp sensor out on the heat sink sees it.



BTW, it looks like you have 26 bangs per burst by looking at the scope pictures (might be an issue when you start doing real streamer experiments)

Really???? Darn software... Yep your right ;-)) I have one too many firing statements in the program...


Cheers,

        Terry


Gerry R