Easiest way to get 10kV at 10W from 24vin? - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: February 16, 2023, 10:13:06 pm
content: HiIs the attached (LTspice and jpeg). the easiest way to get 10kV at 10W from 24vin?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: February 16, 2023, 10:15:55 pm
content: The easiest way is to find a portable 5-10" CRT and rip the FBT out of it...I can't even read the numbers in the schematic, and I don't have a clue what the other transistor is doing, it looks like you tried to do 2-switch forward with peak current mode but it's a capacitive load.Tim

author: jonpaul
author_rank: Super Contributor
timestamp: February 17, 2023, 08:38:43 am
content: Solution since 1930s, FTTS strikes,again!LVDC>>HF oscillators, FLYBACK or any inverters >>few 100..few thousand V>>>doubler, tripler, Crockoff _Walton voltage multiplier>> desired HVDCj

author: Wolfram
author_rank: Frequent Contributor
timestamp: February 17, 2023, 03:46:37 pm
content: No matter what the problem is, a 21 stage multiplier is almost never the right solution. Voltage drop with number of stages has a cubic component, which quickly becomes problematic when the number of stages is over 10, leading to very asymmetrical stress per stage and horrible load regulation that the feedback has to work hard to compensate for.Each stage provides the peak-peak input voltage, so even a four stage multiplier should be able to give you 10 kV DC with an input voltage of around 1 kV RMS. I did a teardown of some compact dental X-ray supplies designed to provide 70 kV DC at 7 mA for intermittent use, they used a four stage multiplier as well, so there's no way that 21 stages is optimum for 10 kV.

author: jonpaul
author_rank: Super Contributor
timestamp: February 18, 2023, 02:46:52 am
content: 1980s, we designed manufactured 10,000 pcs 12.KV 1W VM,Used,custom 40kHz sine trsf , 5V >>600V, 13 stage CW mult.No problem in potted module for avionics.j

author: NiHaoMike
author_rank: Super Contributor
timestamp: February 18, 2023, 04:57:05 pm
content: Quote from: T3sl4co1l on February 16, 2023, 10:15:55 pmAutomotive ignition transformers would be a better choice if you want to manufacture a lot of devices, as they're still in mass production. But that does bring up an interesting question: If all new cars become EVs, would there still be any mass market applications of small 10-60kV transformers?

author: Peabody
author_rank: Super Contributor
timestamp: February 18, 2023, 05:16:27 pm
content: They don't go to 10KV, but you might also look at how photoflashes work. I think most oscillate through a transformer to build up the charge.

author: pcprogrammer
author_rank: Super Contributor
timestamp: February 18, 2023, 05:30:26 pm
content: Just follow electroboomhttps://www.youtube.com/watch?v=jW3_txSfIAQ

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: February 18, 2023, 06:28:07 pm
content: The OP question was the easiest way. That would be to buy something like thishttps://www.digikey.co.uk/en/products/detail/advanced-energy/10A12-P4/10834947HV engineering is somewhat non-trivial. Unless you need a large qty, buy it from someone who's already been through all the pain.

author: pardo-bsso
author_rank: Frequent Contributor
timestamp: February 20, 2023, 11:15:08 am
content: High voltage vacuum relays, capacitors and patience.Does it need to be 10W continuous?

author: Psi
author_rank: Super Contributor
timestamp: February 20, 2023, 12:29:53 pm
content: I'm with T3sl4co1l , TV flyback transformer with your own ~10 turn center tapped winding around the core. (the kind that is only a flyback not the flyback+tripler in one modules)I built one many years back, had two transistors, a couple power resistors and it self resonated.Would take 12V and drive a flyback amazingly well. Not very efficient but it worked well.Would be easy to design it to work from 24V insteadNot a very safe project, but fun. Especially when feeding the output of the flyback into a tripler