Author Topic: XRay Tank- any ideas about what is inside  (Read 377 times)

Offline HighVoltageRulezz

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XRay Tank- any ideas about what is inside
« on: May 25, 2020, 12:52:38 PM »
Hi-

great forum- I am new here and already learned a lot! Thanks.

I salvaged an Xray tank from a HF Xray Power Supply but have no clue how exactly it is connected inside. I do not want to open it, because I am worried to trap air bubbles, so does anybody have an idea what could be on the inside?

It has 2 big and 8 small (9, including a ground stud) connectors on top.

What drive frequency woud you expect? And how to drive it? Fullbridge and a capacitor (additional inductor?) in series to the primary of the tank?

All help would be really appreciated!

Thank you so much in advance
Roman


Offline Mads Barnkob

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Re: XRay Tank- any ideas about what is inside
« Reply #1 on: May 25, 2020, 03:32:54 PM »
Hi Roman and welcome to HVF!

X-ray high voltage generators are pretty standard on the inside for the type you see here. It has the age to be SCR inverter driven or maybe even mains voltage directly.  The operating frequency on the SCR driven are somewhere between 2-5 kHz.

The black and blue wires are the primary connections.

If there is a bridge between two terminals, that is mostly likely the center point where you can insert a shunt resistor to measure the current in the mid-point grounded HV transformer secondary side.

All the terminals to the left connecting to the PCB is voltage/current/temperature feedback from inside the tank.

I did a teardown of a Siemens x-ray head with built in high voltage generator and maybe you can learn something from that:
/>
You can also see some details on a older x-ray high voltage transformer, along with inverter here:
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Offline HighVoltageRulezz

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Re: XRay Tank- any ideas about what is inside
« Reply #2 on: May 26, 2020, 09:40:52 AM »
Thank you so much for the quick and helpful reply!

I am pretty sure though, that it has a higher working frequency- it is pretty light (probably around 20kg) and was connected to a bridge of pretty fast IGBTs before (actually the same IGBTs work in my DRSSTY now  :D )
I once had a 50Hz unit- pretty sad that I had to sell it but it was huge weighing over 100kg but the ease of use was wort it  :-X (Used it to drive my Fusor a while ago)

Do you perhaps also have an idea what the frequency might be for this unit considering it is "high frequency"?

And- can I leave all other pins besides the input wires floating (I guess the ones you mentioned for current measurement have to be bridged- in my case probably the ones connected with the Diodes)? Perhaps even better- let the PCB connected and do not care about the left connections?

Furthermore- what about the tube filament supply? I d expect that to be an extra transformer like in your video, so it would also have to have two contacts routed to the outside?

And- can I run it un-ballasted on the output side or do I need some resistors to protect the multiplier inside in case of arc overs?

Sorry for all the questions but I really do not want to ruin this awesome supply and plan to do some more high voltage / high vacuum stuff... (Bipolar Fusor  8) )

Thanks
Roman

Btw.: I could imagine the rubber tube is somewhat of an expansion volume in case the oil gets warm and expands?
« Last Edit: May 26, 2020, 09:43:18 AM by HighVoltageRulezz »

Offline Mads Barnkob

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Re: XRay Tank- any ideas about what is inside
« Reply #3 on: May 26, 2020, 01:52:26 PM »
I would guess that it runs around 20-40 kHz, but I think some actually run with variable frequency to determine the output voltage by driving it off resonance, can others confirm this?

Sure, leave the PCB in place and have the mid-point bridge connected.

The filament transformers usually have a very low winding number, so maybe it just leeches off of the HV core? Did I show any of that in the videos? It was a small transformer with some silver wire on if I remember correctly.

You need to protect the diodes from over-load, but if you go full AC by removing them, just stop before you cook the oil ;)

Yeah that was also a discussed use of the rubber tube, for keeping the oil level even at different temperatures and not have it blow out.
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Re: XRay Tank- any ideas about what is inside
« Reply #3 on: May 26, 2020, 01:52:26 PM »

 


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