I'm wanting to do some battery charger development work and would like to power from 12V battery (12-16V Supply) and charge batteries from 1.2V to ~30V or so. Anyone know of a circuit that will take an analog output and give ~0-30V out at up to ~3A-5A from a 13.8V supply?
I've been looking at SEPIC regulator circuits and they all seem to be made for a range of input voltage with a fixed output voltage. I need something like SEPIC that will give a variable output voltage that can be controlled from an analog signal. I want to use switching regulators because it would be too inefficient to use 5A at 30V to charge a single cell at 5A at 1.2V (and using perhaps 15A from the 12V supply). I plan to use analog inputs for voltage and current to control and terminate the charge.
I know there are many chargers out their already that do this, and it's not the charge circuit that I'm trying to re-invent, but I want to do things in the software that isn't currently done on any charger that I know of. Such as leaving multiple li-po packs in storage charge and then charging the packs to be fully charged by a certain date and time. Also data logging for each pack so the user can see when a pack is deteriorating...etc.