4500 VDC MOSFETS ?

[Grumpy]

https://www.mouser.com/new/ixys/ixys-4500vmosfet-mosfet/

IXYS 4500V High Voltage Power MOSFETs

pretty expensive, but interesting...

[F6FLT]

Impressive!   
I love the electronics industry. It makes components that I wouldn't have even dreamed of 10 years ago.

[Grumpy]

Triggering a MOSFET with a @N3904 transistor in avalanche mode (see attached file).

Building a pulse generator for 4kv appears to be possible.

Edit: attached file

[gyula]

I came across this manufacturer some years ago on the web, they manufacture really high voltage rated solid state switches like thyristors, MOSFETs, IGBTs, also now in Silicon Carbide tech. 
   
https://www.behlke.com/    https://www.behlke.com/productlines.htm   The prices are surely high and sent by request.  The ON resistances are much lower.

There is this paper from 1991 on a fast 8 kV switch using stacked MOSFETs and components of that era, maybe the principle can be used to build such HV solid state switches still less expensively for 4-5 kV than a dedicated single 4-5 kV device itself costs.
http://bromine.cchem.berkeley.edu/grppub/frbm2.pdf 

Gyula

[gyula]

Triggering a MOSFET with a @N3904 transistor in avalanche mode (see attached file).

Building a pulse generator for 4kv appears to be possible.

No file attached?

[AlienGrey]

Do you mean this post I posted on Dally thread ?
Its on page 1476 !

Sil

[AlienGrey]

Also you dont have to use the PW chip device you can do it with a NE555
The problem with Mos Fets is it's capacitance and to get 1000 volt devices
you have to totem-pole them one way or another  and if one goes pop they all go pop 

Another way is to use ultra fast VHF transistors again Enjoykin 2 published a circuit on the Dally thread
over on Over Unity. I'm sure you can find it I did have it on a slide but some troll has  found a way of converting
JPG files to crud via a vbs file that's now doing the rounds so be aware!

[Grumpy]

I edited my post to attached the article by Baker.

Sorry, I've never looked at the Dally thread to see what it is about...

[Grumpy]

I ordered a couple of these 4500v MOSFETs to try building and pulse generator using a 2N3904 or FMMT411 as an avalanche transistor trigger.

Should make for some serious fun!