15-09-2020, 06:42 AM
Hi Trevor,
The capacitors between connection "1" of the assy and the +25kV connection are in series. If you draw little or no output current, the capacitors are charged and these two together have 25 kV (minus 350 V) over them.
I cannot see how 10 kV capacitors would be sufficient. Whatever the voltage distribution over them, I don't think it is good.
The 10 kV rating for the higher value capacitor (the one connected to the +350 V) is fine.
I think the voltage across the capacitor connected to the 25 kV conn is twice as high as the +350V capacitor. If indeed this is the case, the capacitor to the 25 kV conn gets 2/3 of the voltage = 16.4 kV.
On the other hand, capacitors can usually withstand a much higher voltage than their rated voltage.
I bought some (very) cheap Chinese 2 kV ceramic capacitors for decoupling use, and I tested them as high as my supply would go, i.e. 3.5 kV, and there was no problem at all. During longer use and with pulses this might be different.
So you might get away with it.
Just my 2 cents (or 2 p).
Jac
The capacitors between connection "1" of the assy and the +25kV connection are in series. If you draw little or no output current, the capacitors are charged and these two together have 25 kV (minus 350 V) over them.
I cannot see how 10 kV capacitors would be sufficient. Whatever the voltage distribution over them, I don't think it is good.
The 10 kV rating for the higher value capacitor (the one connected to the +350 V) is fine.
I think the voltage across the capacitor connected to the 25 kV conn is twice as high as the +350V capacitor. If indeed this is the case, the capacitor to the 25 kV conn gets 2/3 of the voltage = 16.4 kV.
On the other hand, capacitors can usually withstand a much higher voltage than their rated voltage.
I bought some (very) cheap Chinese 2 kV ceramic capacitors for decoupling use, and I tested them as high as my supply would go, i.e. 3.5 kV, and there was no problem at all. During longer use and with pulses this might be different.
So you might get away with it.
Just my 2 cents (or 2 p).
Jac
