K
Ken Muldrew
Guest
I want to charge a bank of four 12V, 100Ah lead-acid batteries using a
56V, 5A transformer (so about 78V DC). My plan is to reproduce the
charging stages provided by the UC3906 (but scaled up for 48V) by
using PWM to control the voltage seen by the batteries. The logic is
easy enough to implement in a microcontroller but I'm stuck trying to
figure out what size to make the inductor (basically, the PWM controls
a FET that turns the supply on and off with an inductor in series and
a diode between the FET and the inductor allowing conduction from
ground). Art of Electronics (2nd ed.) gives a single example but I'm
afraid it's been a long while since I've done anything with inductors.
Can anyone give me any hints?
Ken Muldrew
kmuldrezw@ucalgazry.ca
(remove all letters after y in the alphabet)
56V, 5A transformer (so about 78V DC). My plan is to reproduce the
charging stages provided by the UC3906 (but scaled up for 48V) by
using PWM to control the voltage seen by the batteries. The logic is
easy enough to implement in a microcontroller but I'm stuck trying to
figure out what size to make the inductor (basically, the PWM controls
a FET that turns the supply on and off with an inductor in series and
a diode between the FET and the inductor allowing conduction from
ground). Art of Electronics (2nd ed.) gives a single example but I'm
afraid it's been a long while since I've done anything with inductors.
Can anyone give me any hints?
Ken Muldrew
kmuldrezw@ucalgazry.ca
(remove all letters after y in the alphabet)