For the Supercap with 6-500F in series, the 83.3F capacitance, with a series R of 20 ohms, the time to charge to 63.2% of full voltage is 27.7 minutes, the Power MOSFET startup time would be to fast even with very large RC time constants, unless another Supercap. When the system is not in use, I would just turn the switch off. The Supercap would still be charging and no problem with power outage as discharge time is in 20+ minutes. A DPDT power switch would work for both the circuit load and charging states.
Will give this a try with a SMPS and see what happens when the Supercaps arrive with the resistor and power switch.
|