Hello everyone!
I need to build a leakage current detector for a variable source voltage between -100 and 100 VDC.
I am using a -100 to 100 voltage DC source as a gate voltage for a home-built FET, that should in principle not source any current. However, as some of my FETs are broken, some will have a leakage current to the ground. I would like to be able to sense this current. It is not necessary to have a value, just a 0 V or 5 V output for no leak (<100 nA) or leak (>100 nA) current, respectively. (choosing the cutoff point would be good too)
I think I would need a high-side current sense amplifier (as it is leaking, I do not have access to the ground side), but I am not sure which component I could use. Also, I am unsure about what to do with the negative voltages, because I need to be able to sense the current over the entire range of -100V to 100V.
It would be great if you could point me in the right direction.
Cheers,
Bart
I need to build a leakage current detector for a variable source voltage between -100 and 100 VDC.
I am using a -100 to 100 voltage DC source as a gate voltage for a home-built FET, that should in principle not source any current. However, as some of my FETs are broken, some will have a leakage current to the ground. I would like to be able to sense this current. It is not necessary to have a value, just a 0 V or 5 V output for no leak (<100 nA) or leak (>100 nA) current, respectively. (choosing the cutoff point would be good too)
I think I would need a high-side current sense amplifier (as it is leaking, I do not have access to the ground side), but I am not sure which component I could use. Also, I am unsure about what to do with the negative voltages, because I need to be able to sense the current over the entire range of -100V to 100V.
It would be great if you could point me in the right direction.
Cheers,
Bart