[Whats wrong it wont work!]

Attached is a circuit diagram, it looks ok, I think!  but it wont work.  Can anyone suggest why it is not working.  all the components are suitable for 500vdc

Cheers

[switching high voltage supply]

I work in the R&D department for an electrolytic capacitor company. I have been asked to develop a completely automated data logging system using an Agilent aquasition unit.
I have to measure 8 high voltage capacitors simultaneously, these capacitors will be measured for internal pressure via a pressure transducer, internal temperature vie a thermocouple and leakage current, they will be kept in an oven a 95 degrees for the duration of the test. The capacitors are supplied 500vdc using a GENH750w power supply, they will be under test conditions for weeks even months. The capacitors may reach 70psi at different rates therefore I need to turn off the supply to those particular capacitors individually.


So, I have 8 outputs from a labjack U3 that go high when then the capacitors reach 70 psi, the labjack is powered by a USB. The idea in my head is to use the output to some how switch a Transistor,MOSFET,N Channel,SPP02N60S5 to turn on and off the supply to each individual capacitor, possibly using an opt isolator. I am thinking that I need to lower the 500vdc to something that can safely supply the gate of the mosfet.

Please, please can someone offer some suggestions?

Thanks

John

[mosfet problem]

Hello,

I am trying to switch 500vdc supply, I am using (Transistor,MOSFET,N Channel,SPP02N60S5) supplied buy RS.

Problem - the 500v supply is on wether or not the gate has a supply.

Attached is a sketchy schematic.


Please, please can someone help?

Many Thanks


John

[mosfet mayhem]

Hello all,

I am having trouble creating a circuit that will switch a 500v DC supply on and off, I have tried but failed.  I confess I don