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creative CM600 Uses

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Hon1nbo

Fri Aug 14 2009, 08:57PM

Registered Member #902 Joined: Sun Jul 15 2007, 08:17PM
Location: Pacific Northwest USA
Posts: 1042

ok, so I took the CM600s from the Junk Box to make a big coil, but after being approved by parents/teachers it gets nixed to be done at school, can't be done at home due to a very bad history of interference at the house, and the only place I could do it is an hour and a half away and we now have a gas pumping station on that lot, and the time constraints have added up trying to do major projects down there

so I have been trying to make some creative, never-before-seen, uses for these two bricks which I do not want to sit on a shelf, and today I thought of this:

after seeing on the datasheet that one of the uses of these is Welders, I thought that I could use it to control the output of an Arc Welder - possible, but to what purpose? An electric Arc based light. What for? a very high output, High Speed Photography Strobe!

Different from a capacitor discharge type flash, it would have a more controlled duration and timing; also different from other camera flashes it will have a very high light output, so as long as the duration is fast enough for the event at hand it could illuminate a very large space; also unlike conventional flashes, it could be told via circuitry when to turn off, rather than have to wait for a capacitor to finish discharging

now there are a few problems with this idea that I foresee:
first is whether or not the arc will sustain itself after turnoff to produce a significant ghosting effect post-event
second is if two CM600 Bricks can support such a use without damage (I say two assuming that the Arc Welder outputs AC, but I forget if it is rectified)

to ensure that the Arc will form easily on demand, the electrodes would have a very small, thin filament between them to help form the arc, but it should not keep the arc from quenching since the actual source of power is being removed by the CM600s

this is just one idea that I had, out of quite a few - I have never seen anything like this before, so I am wary of my design

Conundrum

Fri Aug 14 2009, 09:18PM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062

pulsed ablative etcher?

hvguy

Sat Aug 15 2009, 04:05AM

Registered Member #289 Joined: Mon Mar 06 2006, 10:45AM
Location: Conroe, TX
Posts: 154

AC will not work for this unless you sync it up with zero crossing, in which case your image timing is now dependent on the AC line. Stick with DC. Filtering the output of the welder should not be a problem... You could always use them as a coil gun switch; i've been wanting to try that for awhile.

Hon1nbo

Sat Aug 15 2009, 05:07AM

Registered Member #902 Joined: Sun Jul 15 2007, 08:17PM
Location: Pacific Northwest USA
Posts: 1042

How would my image timing become dependant on the AC line? The events are generally controlled, and the point of the ultra fast flash is more for the duration of the flash rather that the delay caused by the turnon ocurring at point V=0, in my case at least

Is the possibility of the turnon happening at V=0 what you are referring to?

Otherwise I should be able to control AC Current using one brick on each side of the load due to the built in Anti-Parallel Diodes, should I not?

Steve Conner

Sat Aug 15 2009, 09:51AM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

That's the problem with IGBT bricks, they're the sacred white elephant of electronics.

The smallest, simplest thing you can make with one is probably the good old OLTC. It's not very efficient, but if you just want to say that you've built something with an IGBT brick, it'd do.

Finn Hammer

Sat Aug 15 2009, 10:12AM

Registered Member #205 Joined: Sat Feb 18 2006, 11:59AM
Location: SkÃ¸rping, Denmark
Posts: 741

Perhaps replicating the work of others is not so creative, but if that point of view is in I error on the cautious side, the simplest way to sparks is a BRISG. A T-Brisg is even more desirable:

Cheers, Finn Hammer

J. Aaron Holmes

Sat Aug 15 2009, 03:48PM

Registered Member #477 Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546

Steve McConner wrote ...

That's the problem with IGBT bricks, they're the sacred white elephant of electronics.

Steve, I think you may be mixing your professional and amateur perspectives here. No hobbyist is going to run out and pay full price for new bricks. The way I see it, it's *the rest* of whatever system people are putting these into that's the white elephant.

I mean, let's be honest: The average solid-state coiler is taking a means-justifies-the-ends approach to coiling, and cheap surplus bricks and big caps are simply an enabling factor. It's the SSTCs that are hungry for insane amounts of time and hard-to-get parts, not the other way around. (If that was some kind of taunt, it was... mostly... unintented

)

Cheers,
Aaron, N7OE

Hon1nbo

Sat Aug 15 2009, 04:12PM

Registered Member #902 Joined: Sun Jul 15 2007, 08:17PM
Location: Pacific Northwest USA
Posts: 1042

I was not looking to necessarily make sparks, just put the bricks to use - I was going to build your OLTC, but as I stated the school has become skeptical of allowing me to do it on campus due to the rapid installation of computers and lots of expensive equipment in just about every room of the school, and my farm is just too hard to keep visiting to test and debug the project

and I also find replicating the work of others as not being creative, as Finn Hammer stated, unless it is done in a creative way

but I do still want to know, whether I decide to build it or not, if my idea for a fast Arc Welder based flash would be possible with these bricks...

should my school give final approval for a Tesla Coil on Campus I'll go for that, but these bricks are capable of so much it seems a shame to just replicate the same design, and use it for the same purpose as everyone else just because hobbyists don't use them for much else

hvguy

Sun Aug 16 2009, 05:56AM

Registered Member #289 Joined: Mon Mar 06 2006, 10:45AM
Location: Conroe, TX
Posts: 154

DaJJHman wrote ...

How would my image timing become dependant on the AC line? The events are generally controlled, and the point of the ultra fast flash is more for the duration of the flash rather that the delay caused by the turnon ocurring at point V=0, in my case at least

Is the possibility of the turnon happening at V=0 what you are referring to?

Otherwise I should be able to control AC Current using one brick on each side of the load due to the built in Anti-Parallel Diodes, should I not?

Yes, if you turn on at zero you have no flash, also, the intensity of your flash is dependent on where in the ac line cycle you turn on. You can use IGBTs for "phase cut" power control just like a triac, but it's a bit over kill

Hon1nbo

Sun Aug 16 2009, 02:58PM

Registered Member #902 Joined: Sun Jul 15 2007, 08:17PM
Location: Pacific Northwest USA
Posts: 1042

hvguy wrote ...

well, my events are controlled however timing them with the AC line might be a problem, so best stick with DC - but don't Triacs, like SCRs, keep conducting until the power source is removed?

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