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Best coil design for 1kW

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LAN_403

KV3000

Wed Mar 01 2006, 07:16PM

Registered Member #100 Joined: Thu Feb 09 2006, 06:52PM
Location: Austria
Posts: 9

Hi,

I want to built a solid state tesla coil with an input power of 1kW (from mains).
I think a full brigde design with IRFP460 will handle that power but thats not the point.
What I am looking for is a good coil design;
Maybe somebody can post how big the coil should be for best performance and which sparklengh I can expect.
I've already tested the bridge on a l=40cm d=8cm coil with lower power and got 15cm streamer.

Greets KV3000

HV Enthusiast

Wed Mar 01 2006, 09:18PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068

For maximum arc length, you'll want to build a pulsed double resonant system such as a DRSSTC. However, the IRFP460's won't do as switching components for this type of system.

Dan

EDY19

Wed Mar 01 2006, 09:20PM

Registered Member #105 Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408

I think I would suggest a coil of 14 inches tall and 4 inches diameter, with a small to medium toroid, wound with ~30 or 32 wire. Mine is wound with 35, and it has melted a bit too often to suit my liking. However, you need thin enough wire or enough turns to bring the frequency down into a good range/and or a topload. With 1000W interupted, I guess spark length just depends on how much you push the mosfets, but I would GUESS (I use 40N30s (extras are still on ebay :) ) maybe around 12 inches ??? Not really sure though.

Marko

Wed Mar 01 2006, 09:21PM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

yep im also wondering how much one could push (normal) i dont remember seeing one kW SSTC...
Probably high supply voltage is needed and strong semiconductors, and goal is obivously to make CW system.

EDY19

Wed Mar 01 2006, 09:51PM

Registered Member #105 Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408

When running CW, my SSTC draws 18A at 120VAC- thats right around 2000W- and the semis don't get too warm if i keep the running times low.

EEYORE

Thu Mar 02 2006, 01:20AM

Registered Member #99 Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637

Those irfp460s wont work at 1kw...Also, at 1kw your bound for a few feet of output, not 12in. My old drsstc used 40n60 miniblocks and did 3 feet(very inneffecient design)You ought to see what kinda parts you can get and then go from there.

Matt

EDY19

Thu Mar 02 2006, 02:27AM

Registered Member #105 Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408

I was talking about a normal SSTC, not a DRSSTC. Mine does 16 inches at 2000W, interupted. I was just trying to tell him waht he could do with what he had, yet for any power level, a DRSSTC will make much longer sparks.

KV3000

Thu Mar 02 2006, 04:57PM

Registered Member #100 Joined: Thu Feb 09 2006, 06:52PM
Location: Austria
Posts: 9

For maximum arc length, you'll want to build a pulsed double resonant system such as a DRSSTC.

That will be my next project

I think I would suggest a coil of 14 inches tall and 4 inches diameter, with a small to medium toroid, wound with ~30 or 32 wire. Mine is wound with 35, and it has melted a bit too often to suit my liking. However, you need thin enough wire or enough turns to bring the frequency down into a good range/and or a topload.

The diameter of 4 inches (~10cm) is not much bigger than my current coil;
I thought the sparklengh is growing with the size of the coil.
What do you mean with a good range for the frequency.
My coil runs at ~500kHz - is that low enough?

Those irfp460s wont work at 1kw...

Why not? The supply voltage for the bridge are 320V --> current @ 1kW : 3,125A
That parameters are all below the maximum specification.

KV3000

HV Enthusiast

Thu Mar 02 2006, 06:04PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068

wrote ...

Why not? The supply voltage for the bridge are 320V --> current @ 1kW : 3,125A
That parameters are all below the maximum specification.

Maximum specifications for a device are just that. Also, they are typically rated for a specified junction temperature of the device. You can run them at 1kW (as a bridge), but your cooling scheme needs to be right on.

EEYORE

Thu Mar 02 2006, 07:27PM

Registered Member #99 Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637

I can also state that 500khz is brutal even on irfp460's. Ive got a half bridge right now, they get hot in seconds, literally. Adding an interruptor is sure to help, but just wont be good for high current pulses in drsstc mode.

Matt

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