High Voltage Pulse Generator Circuit

[DejanC]

Hi,

I am looking for ideas to create a HV pulse generator circuit. I do not need all the components to be from scratch. The easiest way I have seen online would be by using a coil and switching it open/closed quickly to generate the high voltage but a quickly collapsing magnetic field. That is, using a MOSFET in combination with a PWM signal generator, a gate driver and a coil of course. Does anyone have any experience with this and and suggested ICs/schematics?

I am looking for about 1-2 kV (possibly higher) and no larger than about 10 MHz pulse frequency.

[Andy Chee]

I like this one (although it plays music, you can use it for plain boring pulses as well):

https://franzolielectronics.com/easy-flyback-i/

[DejanC]

This is a good start but I am hoping for as simple as possible (without the zero crossing detector)?

[Andy Chee]

How about ebay module simple?

https://www.ebay.com/itm/293810681351?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=0AaVICjcSm-&sssrc=2047675&ssuid=&widget_ver=artemis&media=COPY

[DejanC]

This is great, but I would love a little more flexibility with the PWM (setting frequency and duty cycle for example)

[T3sl4co1l]

What load impedance? What rise/fall time or other waveform? Is this for EFT testing, something more specific, or something entirely generic (high voltage for funsies)?

Tim

[DejanC]

Load impedance is unknown. Ideally would be in the ns range of rise/fall time, wishing to producing a unipolar pulse, upto 1 MHz (or lower). Could be categorized under high voltage for funsies, but it is for prototype development and experimentation.

[DejanC]

Basically would like to create controllable pulses based on a inductor/MOSFET switch combination like in the video below:



I am looking for any DIY projects that anyone has seen with specific advice on ICs/FETs/PWM modules to use, etc.

[T3sl4co1l]

Prototyping of what?  Like, there are actual applications for signals like this (undefined* impedance, high voltage, ~ns edge or width, rep rates up to MHz), but it's esoterica like particle accelerator beam dump (deflector plate) drive, or Pockels cell drivers (switched/pulsed lasers).

If you just want to look at something on a scope... then do that [the video] I guess?  Isn't anything fancy, anything will do.  Break it down to simpler problems: what is a gate driver, what does it need to do?  What does a MOSFET need for input? Output? How to design switching circuits?  What does the inductor need to do?  How can you model the RLC equivalent turn-off (flyback) circuit, and resulting transient waveform?  Why does it ring?  What is the peak voltage determined by?  (And why does it blow transistors?)

Tim

[Terry Bites]

Marx generator?
Lighning fast pulses!

[jonpaul]

Lightning on Demand

https://www.lod.org/

Old friend Greg LEYH

j

[zrq]

Maybe this company have something suitable for you? kV and tens of MHz sounds difficult though.
https://www.behlke.com/

[DejanC]

I am looking to power a device with pulsed power/voltages and read the output RMS current and RMS voltage on a scope. I am thinking of a PWM module + gate driver (maybe) + FET + inductor (high side switching) to create this high voltage spike.

Am I correct to say that for a resistive load we can use RMS voltage/current on the scope to readout average output power?

[Marco]

High voltage half bridge with GDTs, either with GAN or SIC mosfets. Nice flat top pulse and not load dependent.

http://ticnn.tju.edu.cn/064709_1_5.0142031.pdf

[daqq]

See: https://www.behlke.com/

[inse]

Just a side note: 2kV 10MHz kV/ns those orders of magnitude are not for the faint hearted nor the beginners.
Do you have the necessary equipment to debug/fine tune your setup?
High voltage high speed probes, e.g.
Also consider that high voltage probes have a frequency derating