DC Power Tesla Coil

[Jeg]

Hi to all
I have a ready to use tv flyback to create 20KV HV at 1mA. With this Transformer i will charge a cap through a charging coil and a de-q-ing diode.

According to the equations i found on this page http://www.richieburnett.co.uk/dcreschg.html
i calculated a huge inductance coil (Lp) and i don't know if i made a mistake on somewhere.

At the end of the page the last equation calculates Lp. I used as Vdc=20KV, Pmax=(20KV X 1mA)=20W, and BPSmax=500.
With these numbers i find an inductance of 8114H !!!!  Is that possible???

TNKS
Jeg

[TinselKoala]

What your numbers are telling you is what I think I told you some time ago: the flyback transformer does not supply enough current at the rated voltage to work effectively in a SGTC with a rotary break.

Instead of the flyback, put in a MOT at 2 kV, 600 mA, and see what you get.

[Jeg]

Hi Tinsel thanks for the reply

I re-calculated inductance with the numbers you gave me, and finally became a normal value of 0.8H!

Ok. I will search a little for finding a good mosfet or igbt driver for my MOT and i ll be back again later. 

tnks

[TinselKoala]

Just plug the MOT into a Variac, you don't need a driver. Use another MOT primary in series, secondary shorted, to act as a current-limiting choke, or just be careful on your input current.

[Jeg]

Use another MOT primary in series, secondary shorted

You mean to connect the second MOT in series with the secondary of the first MOT as a ballast? Is it still deadly dangerous even with this current limiter?