Author Topic: BrOdin coil - High power Big sparks!  (Read 19345 times)

Offline davekni

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Re: BrOdin coil - High power Big sparks!
« Reply #160 on: November 07, 2021, 08:11:19 PM »
Quote
They seem to be holding up so far, even at 2500A primary current limit. IIRC, the mmc is only built at 750ish Arms, so maybe these caps aren't all that bad after all?
If  750Arms is the capacitor rating, you are likely fine.  2500Apeak is 1770Arms during full current (pulse-skip operation) enable pulses.  750Arms corresponds to 18% duty cycle of 1770Arms.

Quote
I cranked the primary current limit up to 2500A because YOLO, SEND IT, LFG! I am sick of burning secondary coils up, something else break please! But nothing blew up this time, guess I'll have to wait a little longer to rebuild the bridge!
The quandary seems to be how to get arcs farther away from the coil while keeping your beautiful toroid.  Perhaps the solution is a large tapered breakout point, large enough to both add some capacitance and to move arcs farther away.  Perhaps a variation on something I'd suggested earlier:  Use a 2" x 4' x 8' styrofoam insulation board (or two laminated to get 4" thickness).  Cut into a tear-drop shape, 8' long to the point and 4' diameter at the other end.  Round edges and cover with foil.  Add a breakout rod extension past the point.  May need some counterweight at the round end of the teardrop to keep it balanced on top of your toroid.
David Knierim

Offline fh89

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Re: BrOdin coil - High power Big sparks!
« Reply #161 on: November 09, 2021, 05:17:25 AM »
Quote
They seem to be holding up so far, even at 2500A primary current limit. IIRC, the mmc is only built at 750ish Arms, so maybe these caps aren't all that bad after all?
If  750Arms is the capacitor rating, you are likely fine.  2500Apeak is 1770Arms during full current (pulse-skip operation) enable pulses.  750Arms corresponds to 18% duty cycle of 1770Arms.

I appreciate the insight as always! There's more headroom than I realized on the cap rating. Hopefully it will last a decent amount of time!

Quote
I cranked the primary current limit up to 2500A because YOLO, SEND IT, LFG! I am sick of burning secondary coils up, something else break please! But nothing blew up this time, guess I'll have to wait a little longer to rebuild the bridge!
Quote
The quandary seems to be how to get arcs farther away from the coil while keeping your beautiful toroid.  Perhaps the solution is a large tapered breakout point, large enough to both add some capacitance and to move arcs farther away.  Perhaps a variation on something I'd suggested earlier:  Use a 2" x 4' x 8' styrofoam insulation board (or two laminated to get 4" thickness).  Cut into a tear-drop shape, 8' long to the point and 4' diameter at the other end.  Round edges and cover with foil.  Add a breakout rod extension past the point.  May need some counterweight at the round end of the teardrop to keep it balanced on top of your toroid.

As silly as I know this sounds, the trade off in aesthetics just isn't worth it to me. I do appreciate the creative suggestions though! Next coil will have a properly sized toroid, but I'm content now with where this one is at. I will still experiment a bit with a slightly shorter and also a very short breakout point as well as elevating the coil, but aside from that I'm calling it a finished project.

Offline Mads Barnkob

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Re: BrOdin coil - High power Big sparks!
« Reply #162 on: November 09, 2021, 07:02:44 PM »
Being from a 3 phase country, its just so unreal to see someone pull 350A from a 240VAC output!

If you have forced air cooling on the MMC, it will last a long time. A thing I thought about, was to never cut the leads of axial MMC capacitors, but curl them up in a spiral, to use as a heat sink. As 66% of heat in a axial capacitor is radiated out of the ends and especially the leads. Only 33% is radiated from the round large surface.

Can I use one of your pictures to add your coil to my list of featured coils on kaizerpowerelectronics.dk ? I think I have asked about this before, but have forgot to actually add it :)
https://kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics
https://www.youtube.com/KaizerPowerElectronicsDk60/join - Please consider supporting the forum, websites and youtube channel!

Offline fh89

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Re: BrOdin coil - High power Big sparks!
« Reply #163 on: November 09, 2021, 08:13:33 PM »
Quote
Being from a 3 phase country, its just so unreal to see someone pull 350A from a 240VAC output!

Yes, It's quite amazing that the coil can draw so much power!


Quote
If you have forced air cooling on the MMC, it will last a long time.

I think I have that covered! Six 120mm 240V fans on the MMC


Quote
A thing I thought about, was to never cut the leads of axial MMC capacitors, but curl them up in a spiral, to use as a heat sink. As 66% of heat in a axial capacitor is radiated out of the ends and especially the leads. Only 33% is radiated from the round large surface.

I did something along these lines, I soldered the leads to a thick 1/8th" x 1/2" (3mm x 12mm) copper busbars for heatsinking of the leads:
 [ You are not allowed to view attachments ]

I give up. I tried 47 times to get this attachment to work, but for some reason it just says  [ You are not allowed to view attachments ] every time, even though the first photo above works!
Photo of MMC below


Quote
Can I use one of your pictures to add your coil to my list of featured coils on kaizerpowerelectronics.dk ? I think I have asked about this before, but have forgot to actually add it :)

Yes, please feel free to use any of my photos! I think this one is my favorite though!

 
Also, here is a photo dump of all of my construction photos (some of these photos show mistakes that were later corrected):
https://1drv.ms/u/s!Ap7oF5iAXsqR_Q4Ll1D90VbZBSRI?e=13UIZi

« Last Edit: November 10, 2021, 04:32:37 AM by fh89 »

Offline futurist

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Re: BrOdin coil - High power Big sparks!
« Reply #164 on: November 09, 2021, 11:41:16 PM »
Wow those are really impressive streamers!

That 350A current draw reminds me of mr. Photon, a plug straight to the National Grid? :D

Offline Kizmo

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Re: BrOdin coil - High power Big sparks!
« Reply #165 on: November 22, 2021, 06:55:08 PM »
This is just so cool to see!

Pulse skipping driver on a big coil, lovely!

Offline fh89

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Re: BrOdin coil - High power Big sparks!
« Reply #166 on: November 22, 2021, 07:13:14 PM »
Quote
Wow those are really impressive streamers!

That 350A current draw reminds me of mr. Photon, a plug straight to the National Grid? :D

Quote
This is just so cool to see!

Pulse skipping driver on a big coil, lovely!

Really appreciate it coming from you guys! Been busy with other projects, but hope to get the coil fired up again soon and get some more video!

Offline Kizmo

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Re: BrOdin coil - High power Big sparks!
« Reply #167 on: November 22, 2021, 07:56:40 PM »
This makes my brute force approach (BiggerDR) to seem like waste of silicon.

Offline patracy

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Re: BrOdin coil - High power Big sparks!
« Reply #168 on: November 27, 2021, 06:06:59 AM »
I've enjoyed reading about this coil.  So much that I went out and purchased a few of those CM600's myself.  Now to find a driver and a few other bits.  Maybe I can offload some of the stuff I have to start funding that build.

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Re: BrOdin coil - High power Big sparks!
« Reply #168 on: November 27, 2021, 06:06:59 AM »

 


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