Author Topic: Tardief's DRSSTC  (Read 1424 times)

Offline Hydron

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Re: Tardief's DRSSTC
« Reply #40 on: August 07, 2017, 02:18:54 PM »
It is basically 3 parallel single phase voltage doublers. Instead of having 400VAC fullwave rectified to 564VDC, you have the midpoint/neutral to get 2x 325VDC ~ 650VDC across the capacitors.

I am unsure about how this balances in regard to load on each phase or neutral.
I imagine the load sharing would also depend on interactions between the coil BPS and line frequency. The DRSSTC is not a nice constant load; it will take big chunks of energy out of the bus capacitors at a low frequency. At lower BPS, especially close to multiples of line frequency, there may be significant mismatch between phase currents just because the bus caps get emptied just before the peak of a particular phase. I have not done any simulations however, though they would not be difficult (I suggest LTSPICE as a more powerful tool than online simulators - it's easy to model most of the coil in it).

Offline Tardief

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Re: Tardief's DRSSTC
« Reply #41 on: August 12, 2017, 10:06:07 PM »
Hi,
The topload is under construction.  :) I will make some photos when its done.

We still have some wuestions about the primary coil.
We will make it from 12mm copper tube.
What is the suggested distance between the turns? We thought about 1cm.
And what about the distance between the primary and the secondary?
The last question is about the coupling. It has to be an exact value or it's enough that is about 0.15?

Offline futurist

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Re: Tardief's DRSSTC
« Reply #42 on: August 12, 2017, 11:19:16 PM »
There is very little benefit from 10 mm to 20 mm copper tubing, for coil of your size I wouldn't go anything higher than 10 mm if you didn't already bought the tube
Also 12 mm tubing will be more difficult to bend in shape than 10 mm

I suggest coupling k ~ 0.16 so you can lower it by raising secondary, for example with wood disc

Offline Tardief

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Re: Tardief's DRSSTC
« Reply #43 on: August 14, 2017, 11:09:23 AM »
We wanted to use 12mm because we can pump through more air/water.

How did you choose the size of the heatsink?

Offline Mads Barnkob

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Re: Tardief's DRSSTC
« Reply #44 on: August 14, 2017, 01:52:43 PM »
Hi,
The topload is under construction.  :) I will make some photos when its done.

We still have some wuestions about the primary coil.
We will make it from 12mm copper tube.
What is the suggested distance between the turns? We thought about 1cm.
And what about the distance between the primary and the secondary?
The last question is about the coupling. It has to be an exact value or it's enough that is about 0.15?

12 mm copper tube is fine for a primary, 10 mm is a very common size in Denmark, so that is what I always use.
I have 20 mm between turns on my large DRSSTC, less would make it harder to mount a heavy tap contraption on, simply from risk of short-circuiting two turns.
I think its about 20-30 mm from secondary to most inner turn of the primary coil
Coupling is a very interesting parameter, the higher the better, but you have to take measures against flash-over, tuning can be more tricky etc. Somewhere between 0.15 to 0.20, as futurist mentions, its much easier to lower the coupling with a few disks that making it higher later (like in, good luck sawing a hole in the middle and lowered the coil down through it)
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Tardief

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Re: Tardief's DRSSTC
« Reply #45 on: August 30, 2017, 07:22:59 PM »
Hi,
We are still alive. :D

What ferrit core do you suggest for the GDT and feedback?
I found that the AL should be big enough, but nothing about the physical size.

Offline Mads Barnkob

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Re: Tardief's DRSSTC
« Reply #46 on: September 04, 2017, 09:41:54 AM »
Hi,
We are still alive. :D

What ferrit core do you suggest for the GDT and feedback?
I found that the AL should be big enough, but nothing about the physical size.

For the GDT I calculated it for my DRSSTC1, but just doubled the physical size for the DRSSTC3 :o  ( http://kaizerpowerelectronics.dk/tesla-coils/kaizer-drsstc-i/ scrol down to 25th September 2009 )

For feedback, just use the same core type as for the GDT, but here the physical size is more dependant on where you want it to sit in the circuit, it simply has to be large enough to make the primary cable/busbar go through, have enough distance for isolation from the inverter voltage and not be a source for a possible short circuit from inverter into control circuit. I made a nylon bobbin for them to be mounted on, with a piece of brass rod going through for the DRSSTC3.

http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

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Re: Tardief's DRSSTC
« Reply #46 on: September 04, 2017, 09:41:54 AM »

 


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