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Registered Member #503
Joined: Sun Nov 19 2006, 06:37PM
Location:
Posts: 59
Hello kind folks,
I need some suggestions. I have a 30kV DC source voltage. I need to chop it into a pulsed waveform with a very low duty cycle say about 1%. Would this be feasible with a HV switch at 30kV levels ?
Registered Member #503
Joined: Sun Nov 19 2006, 06:37PM
Location:
Posts: 59
Hi Sulaiman, Thanks for replying. Your second point is unclear; it shows up here as "explosive R&D" Yes the DC source is low power , and can be varied from about 5kV to 30kV.I took 30kV as the maximum.The current delivered would be maximum of 50mA,during the On Period which is 300uS while the total period is 25mS; i.e. very low duty cycle. I could not understand the spark gap method;any links ? In an case it would be probably not suitable.The gizmo is used to check insulation,which may have breakages. The spark created at this blemish needs to be detected and alert the user. Mechanical switch could be also avoided to reduce complexity and improve reliablity. I am looking for some MOSFET/IGBT which can switch 30kV and is probably less than $50. Thanks again and good luck to all of us!
Registered Member #57532
Joined: Sun Oct 18 2015, 03:19PM
Location: Slovenia
Posts: 4
It will be hard to get single semiconductors to switch 30 kV. As far as I know highest voltage are SiC mosfets for 15 kV which are not yet available. Than next are thyristors, but are usually made for high powers. In any way it will be hard to go under 50$.
If you want to go with semiconductor swithching, you should go stacking easy to obtain high voltage mosfets (1200 V - 1500 V). Magnetically or optically isolated gate driving. Zenner protected overvoltage of single mosfet and maybe some resistor balanced divider that passively distributes load among them. There are also companies that produce such high voltage stacked mosfet switches (google: high voltage switches).
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Switching a high voltage (30kV)
