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Would a full wave rectified, 40Kv peak signal be acceptable? If so the reservoir capacitor can be eliminated.
Yes it should be, however, I believe I would be using half wave CW multiplier circuits. I am wondering if a re-wound MOT transformer may be able to supply the 10kv needed (however I am once again wondering about safety). after that it is simply a matter of putting that voltage through a voltage quadrupler correct?
If so then the capacitors for that would be about .42 uf right? I also take it the whole of the CW multiplier will need to be separate and under mineral oil to prevent arcing. Would I use a circuit board or breadboard to build the multiplier? The diodes and capacitors also need to be rated for about 25kv correct?
Nice! I am planning on experiment with hydrogen, helium, and argon, at pressures form 1-10 millitorr. I am however using a diffusion pump."We" got DC plasmas with about 300 VDC at about 2-5 mTorr of pressure, Argon atmosphere if my memory is correct. Occasionally, you had to raise the pressure to get a strike. Your using a MFC (nass fkiw controller) for the Argon and a pressure controller. The main pump was a Cryopump.
To add to this, I went into an an online circuit simulator and made this. This is all wired to have a positive output. I was fiddling around, but I could not figure out how to get the output's polarity negative.
Yes, a microwave oven transformer (MOT) could be re-purposed for your application, but MOTs do not have the best characteristics for a bench (voltage) power supply. And the core dimensions and arrangement are not ideal for an extra high tension (EHT) secondary.I am wondering if a re-wound MOT transformer ...
Nice work Lash.Well, I sure have become obsessed with designing this power supply now. After doing much more experiment in the simulator, and research, I finally figured out how to get a negative DC output. Here is the picture of the design in the simulator, along with what I plan on doing for voltage measurement.View attachment 103270
This is with the AC input being 10kv. For whatever reason it is saying the voltage is unusually high. I believe this is an error
It is doubtful that immersion in insulating oil will be necessary, but a conformal coating, or even potting may be a wise precaution, especially if the EHT Generator is to be for general use where high humidity will be encountered.I also take it the whole of the CW multiplier will need to be separate and under mineral oil to prevent arcing.
Afraid not. There will be some very high voltages associated with the secondary electronics, so EHT wire will need to be used for any cable runs. Electronic components will need to be mounted on high-voltage ceramic stand-off pillars, and the components will need to be well spaced out and laid-out to minimize voltage/space gradients between components. This means that the EHT electronics will need to be much bigger than you may expect.Would I use a circuit board or breadboard to build the multiplier?
I agree, safety for me, and especially those around is the most important factor to consider. I do actually have people who are going to help me this. I have been recently talking to a guy who does work with x-ray machines, and also does a lot of electronics projects. I also have been talking to the dean of engineering at my local university, and he said he is going to put me in touch with some people who can help with certain aspects of the project.
As to asking on this forum, I absolutely was not going to use this as my only recourse, but it does help me learn some information, get advice, and put things into perspective on what I am trying to do, while also introducing new ideas.
From a person that has made many 40kv power supplies;Would a full wave rectified, 40Kv peak signal be acceptable?
In production we stack diodes that have the same amount of leakage current. Usually we pick diodes with the same date code.The diodes are usually stacked in the systems I worked on.
From a person that has made many 40kv power supplies;
Where are you going to get 60kv diodes?
Parts like this are hard to find.
https://www.semtech.com/images/datasheet/sckvxk12.pdf
.The diodes are usually stacked in the systems I worked on. It takes multiple diodes to get to the voltage you need. The diode drops were on the order of 10 V on the systems I worked on.
Yes, you have mentioned that before- in the UK, high end/industrial gear has the live and neutral switched and, for this application, switching both live and neutral is probably a good move.spec: We generally don't switch the neutral in the US. I've only seen one system that did and, guess what, there was a High voltage thing in it. It wasn't the main breaker either.
(3) Instead of using 10 * 10nF, 10KV capacitors per bank, at a higher cost (£45UK), you could use 2 * 47nF, 10KV capacitor per bank (see link below).
The choice of reservoir capacitor depends on the ripple voltage that you can tolerate, according to the formula,Hi, sorry for not responding, I have been out of town for a bit. Something I was recently wondering about the capacitors, was why at 60hz they need to be at 470nF. I tried looking this up, but I could not find anything.