Hello People,
I try to outline a 12V UPS for my router. The commercial things I see are either to complicate, means have to much functions or they use a relay. I want to build a solid state switch that is faster than a relay. I have a first sketch. What do you think thats the right direction?
The battery has her own BMS it's not in the circuit here. The comparator is the watchdog who activates the switch in case of a power outage. There are a few diodes to prevent return current. A few resistor to adjust the components margins. R4 is a trimm-pot. Works as a pull-down resistor and adjust the threshold for the comparator.
PS: I know. The input voltage has to be higher than 12V.
