I am trying to work out how to make a float charger for a 48V AGM battery.
The problem I am facing is that the charger will be supplied by a full-wave rectified sine at 80-100Vpeak (this is a system requirement and there is really no good way around that). I tried to make it with just two opamps and an output transistor, but the whole thing is not very stable (see the schematic).
How would I calculate the feedback or what should I change so that the battery current after the initial charge at 0.5s settles and is with little ripple?
The problem I am facing is that the charger will be supplied by a full-wave rectified sine at 80-100Vpeak (this is a system requirement and there is really no good way around that). I tried to make it with just two opamps and an output transistor, but the whole thing is not very stable (see the schematic).
How would I calculate the feedback or what should I change so that the battery current after the initial charge at 0.5s settles and is with little ripple?