Given the following example:
A flyback converter charges a 10nF capacitor to 4kv. When a 100k load is attached to the charged cap it discharges in ~3ms. Now with the load attached, the cap no longer charges to 4kv, it instead delivers a more or less steady 500v to the load. Only when the load is disconnected will it charge again to 4kv.

My question: Is there anyway to replicate the connecting and disconnecting of the 100k load without doing so physically. In other words, is there a way to allow the cap to charge to several kilovolts before discharging.

Thanks for any help!

 

I don't see you could not do it physically.
You could use a hypothetical high voltage switch or relay to disconnect the resistor during charge.

 

I don't see you could not do it physically.
You could use a hypothetical high voltage switch or relay to disconnect the resistor during charge.

Could you use a varistor in series before the load, which would show high resistance when the cap is at a low voltage and lower resistance as it charges up? Or is that a foolish idea...

 

Could you use a varistor in series before the load, which would show high resistance when the cap is at a low voltage and lower resistance as it charges up? Or is that a foolish idea...

Likely nothing that would stand 4kV.

 

You could use a hypothetical high voltage switch or relay to disconnect the resistor during charge.

You could use a PL504 (rated to 7kV) to switch it.
Thermionics make a comeback.