I've been experimenting with ultracaps for a while now and I have a very specific problem:
I use the ultracapacitors to compensate for line inductances and general power filtering. When I install a capacitor (16F to 33F) in a vehicle (14Vdc) I obviously have to precharge them to avoid the huge inrush current. However this is not a permanent solution because when the battery is disconnected for service the capacitor would discharge and would have to be recharged again.
My plan is to use a high power resistor to limit the current until the voltage has reached a certain level. Then a Mosfet/SSR/Relay will short the resistor, connecting the bank to the system.
Now my question is, what is the simplest most robust (not cheapest) solution that can be left unattended.
Obviously once the system is charged I want the lowest possible current draw and resistance.
Maybe an opamp as an comparator switching a mosfet? How do I avoid the ohmic region?
Heres the datasheet for one of my typical caps: https://cz.mouser.com/datasheet/2/257/2_7_100F_ds_3001959_datasheet-1517387.pdf