High Voltage Pulse Generator Circuit - Page 1
Forum section: electronics / projects

author: DejanC
author_rank: Regular Contributor
timestamp: December 31, 2023, 04:05:30 am
content: 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.

author: Andy Chee
author_rank: Super Contributor
timestamp: December 31, 2023, 04:12:16 am
content: I like this one (although it plays music, you can use it for plain boring pulses as well):https://franzolielectronics.com/easy-flyback-i/

author: DejanC
author_rank: Regular Contributor
timestamp: December 31, 2023, 05:08:21 am
content: This is a good start but I am hoping for as simple as possible (without the zero crossing detector)?

author: Andy Chee
author_rank: Super Contributor
timestamp: December 31, 2023, 05:26:22 am
content: 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

author: DejanC
author_rank: Regular Contributor
timestamp: December 31, 2023, 05:31:30 am
content: This is great, but I would love a little more flexibility with the PWM (setting frequency and duty cycle for example)

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 31, 2023, 05:38:15 am
content: 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

author: DejanC
author_rank: Regular Contributor
timestamp: December 31, 2023, 05:48:47 am
content: 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.

author: DejanC
author_rank: Regular Contributor
timestamp: December 31, 2023, 05:56:29 am
content: 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.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 31, 2023, 12:30:31 pm
content: 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

author: Terry Bites
author_rank: Super Contributor
timestamp: December 31, 2023, 03:53:50 pm
content: Marx generator?Lighning fast pulses!

author: jonpaul
author_rank: Super Contributor
timestamp: December 31, 2023, 04:30:26 pm
content: Lightning on Demandhttps://www.lod.org/Old friend Greg LEYHj

author: zrq
author_rank: Frequent Contributor
timestamp: December 31, 2023, 11:24:29 pm
content: Maybe this company have something suitable for you? kV and tens of MHz sounds difficult though.https://www.behlke.com/

author: DejanC
author_rank: Regular Contributor
timestamp: January 02, 2024, 03:39:26 pm
content: 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?

author: Marco
author_rank: Super Contributor
timestamp: January 03, 2024, 08:52:15 am
content: 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

author: daqq
author_rank: Super Contributor
timestamp: January 04, 2024, 08:14:42 am
content: See:https://www.behlke.com/

author: inse
author_rank: Super Contributor
timestamp: January 04, 2024, 08:50:33 am
content: 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