Author Topic: Homemade HV transformer  (Read 1437 times)

Offline AlexanderHun

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Homemade HV transformer
« on: September 14, 2019, 05:05:00 PM »
Hello!

I would like to ask you, who has made several high voltage transformers here? I was experimenting with television flyback transformers, it could produce a piece of 30kV. They can be connected in series but I want to make my own, my goal is at least 60kV. Do you think this is possible? Included are two forms of what ferrite core I found, so I should design a secondary one.




I drive with this switch ..

https://cdn.instructables.com/FSW/2MIC/GNBEVVKF/FSW2MICGNBEVVKF.LARGE.jpg?auto=webp&&frame=1

I have a 3d printer, I could print what I need, but unfortunately I haven't designed one yet. I will need to drive an X-ray tube, then I want to apply a voltage multiplier.



Offline ritaismyconscience

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Re: Homemade HV transformer
« Reply #1 on: September 14, 2019, 06:35:32 PM »

Offline AlexanderHun

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Re: Homemade HV transformer
« Reply #2 on: September 14, 2019, 06:43:15 PM »
Thanks! I don't see any specific electrical voltage, nor is it written by any person who built one. Do they measure voltage? I see a 14-20kV post, but it is very little for me

Offline ElectroXa

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Re: Homemade HV transformer
« Reply #3 on: September 14, 2019, 07:01:28 PM »
Hi  :)

what core is in the picture ?
I have the same project, but with a lower voltage (20kV)

I suggest for the bobbin a milled HDPE cylinder because 3d printed coils have air bubble, so partial discharges can occur

cheers

Offline AlexanderHun

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Re: Homemade HV transformer
« Reply #4 on: September 15, 2019, 10:39:29 AM »
Thanks for the help! I have a dental X-ray and I want to operate an X-ray tube. The question is how much tension to multiply, what do I manage to produce for myself.

Philips oralix dental x-ray head:


I usually do X-ray fluoroscopy videos, this is my own:

https://www.youtube.com/watch?v=3kqrlqLzQrE


The tube I want to operate requires 60kV:   (I'd like to operate this tube)



This is a "siemens röntgenkugel" x-ray tube




« Last Edit: September 15, 2019, 10:41:34 AM by AlexanderHun »

Offline davekni

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Re: Homemade HV transformer
« Reply #5 on: September 16, 2019, 02:36:17 AM »
Presuming you need 60V DC, it's probably easier to use a somewhat-lower-voltage transformer and a voltage multiplier.  For my Marx generator, I wound a +-11kV transformer followed by a voltage multiplier to get +-22kV DC
David Knierim

Offline AlexanderHun

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Re: Homemade HV transformer
« Reply #6 on: March 31, 2020, 12:05:40 PM »
Hi! Today I experimented a bit, I have a lot of quarantine due to the coronavirus, I got this with two flyback transformers. Measurement coming soon, the voltage divider has been made ...

https://www.youtube.com/watch?v=XpStl-phy7w

Offline John123

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Re: Homemade HV transformer
« Reply #7 on: April 01, 2020, 07:39:48 PM »
Is that with primaries in parallel and secondaries in series?

Offline johnf

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Re: Homemade HV transformer
« Reply #8 on: April 01, 2020, 08:37:29 PM »
I made a 250kV x-ray psu a few years back
i used a max of 7kV from the transformer. Formers very similar to what has been already linked except i had the primary under the secondary. The secondary a press fit over the primary former. 12 turn primary driven by an audio amplifier running +-48 volt rails @ 20 khz
The 7 kv supply fed the center of of a full wave cockcroft walton multiplier one multiplier going each way so that I had the actual transformer feeding inin the centerof the multiplier with the multiplier capas doubled in value for the first two stages in each direction
more info here http://www.coultersmithing.com/forums/viewtopic.php?f=9&t=98

High Voltage Forum

Re: Homemade HV transformer
« Reply #8 on: April 01, 2020, 08:37:29 PM »

 


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