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Registered Member #3429
Joined: Sun Nov 21 2010, 02:04AM
Location: Minnesota, USA
Posts: 288
I too bought hv, high power diodes from ff77hh a couple of years ago. At first, I was concerned about buying from a seller in China, but I was pleasantly surprised. Shipping was relatively quick, and the quality of the parts was as good as anything you can buy here in the U.S. (at more than twice the price!).
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
If you use 20kV caps and 20kV diodes, you can run them at 15kV per stage with some safety margin. If you feel lucky you might run them at 18kV per stage, personally I wouldn't exceed 15kV.
A 6-stage multiplier made with the 2.2nF caps you linked to, running from a 50kHz 15kVpp source, would be able to deliver 70kV at 1mA, without exceeding any of the component specifications, so if 1mA is enough, those components you linked to would be just fine. More current would also be possible by increasing the frequency, but I wouldn't go above 100kHz due to diode reverse recovery losses.
A ZVS flyback driver would be ideal to drive this, they have no problems with capacitive loads. The secondary would need to deliver 15kVpp which is just above 5kV RMS.
For voltage stabilization, you could use a buck-converter feeding the ZVS flyback driver, or even a linear regulator, with the feedback voltage being taken from the tube anode via a high voltage divider.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
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Posts: 2242
Hmm, 1mA. I suppose that could work for now, and it'd be a simple task to // caps later if I need more current.
I'll worry about stabilization later, but in the meantime I need a way to supply a variable voltage to the ZVS. A linear regulator would be very lossy, so maybe a buck converter using the SG3525 (I have a spare) may work. I can't find any good info on how to use the chip though. I also don't have an L meter so that part of the PSU will be mostly trial and error.
Also, what's the smallest value cap that a ZVS will handle without blowing up?
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
Grenadier wrote ...
Hmm, 1mA. I suppose that could work for now, and it'd be a simple task to // caps later if I need more current.
I'll worry about stabilization later, but in the meantime I need a way to supply a variable voltage to the ZVS. A linear regulator would be very lossy, so maybe a buck converter using the SG3525 (I have a spare) may work. I can't find any good info on how to use the chip though. I also don't have an L meter so that part of the PSU will be mostly trial and error.
Also, what's the smallest value cap that a ZVS will handle without blowing up?
Start with a linear regulator, then upgrade to a buck regulator when everything works. Throwing many uncertain factors into the mix at the same time just leads to confusion.
If you up the input voltage to 9kV pk, so that the per-stage voltage is 18kV, and increase the frequency to 100kHz, you'll be able to get 2mA from the same components.
Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
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man i had the cutest little ac fbt, and i was running it on my zvs and it just decided to play dead?!
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Designing a variable HT PSU
