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Registered Member #953
Joined: Mon Aug 13 2007, 04:29PM
Location:
Posts: 1
Hi,
I have a Matsusada high voltage DC supply, 0-10kV, 134mA. I would like to turn this into a pulsed high voltage supply. I would like about a 0.5us pulse width (or less), with at least a 10kHz repetition rate (preferable more). Pulse shape doesn't have to be pretty. Are there FET's or IGBT's or similar that would be capable of this? Cost isn't a huge issue. Thanks for any help,
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
The fact that you ask this question tells me you are in for *quite* a learning experience.
No single MOSFET or IGBT can handle 10kV (yet). IGBTs are getting up near 6.5kV now i think (maybe more in laboratory). But you probably will have an easier time finding stuff in the 1.2kV to 2.5kV range. In any case, you need to figure out a safe way to series the switches. Voltage balancing is a huge concern, and is particularly difficult during the transition period from ON to OFF (when the load is inductive) or OFF to ON (when capacitive). I dont know if anyone on this forum has really done what you want to do, so you will have to do your homework, and perhaps come here for a sanity check.
Of course, there are vacuum tube switches that would do what you want. There is a reason vacuum tubes are still around, and this is one of them (that and VHF high power switching). I dont have any suggestions on what type of tube you would want, but id be searching for a triode with a 10kV anode rating and hopefully a decent pulse current rating.
Registered Member #914
Joined: Fri Jul 20 2007, 06:22PM
Location: South Bend, IN
Posts: 85
Inside the box there's probably a section of the power supply on the low voltage side that you could switch instead that would effectively do what you want. Do you have a service manual or electrical schematic of the unit?
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
Can you trigger your source with a trigger tube of some sort, like a big Xenon flash tube? It would be lossy, and it might be too slow, but its just an idea.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
The best way to do this is to use a thyratron and a PFN. Traditionaly this is done for microwave sources. The PFN determins the pulse width. It can be done by the hobbyist depeding on your skill level and bank account. With a surplus job you could do it for say 400-700$ depending how many parts you have like the HVPS.
Registered Member #289
Joined: Mon Mar 06 2006, 10:45AM
Location: Conroe, TX
Posts: 154
It is technically possible to produce a pulse that short at that voltage using an air sparkgap over a surface. Reference high-speed photography and microscope slide sparkgaps for more on this. If this needs to be accurate and reliable though a good tube is the way to go. We really need to know more about the load to properly advise on this one….
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High voltage switching
