Li-Ion Charger V1

114

01:18:27

Revamped to actually work, thoughts?

published 10 years ago

hurz

10 years ago

It adjust the output voltage only, not the current. The current is only limited by the battery and the diode. The opamp is working like a comparator and would always switch between 0 or 5V according if bat voltage is below or above reference voltage.

ETJAKEOC

10 years ago

Okay, touched it up a little bit, I still can't figure how to push more current without raising the voltage above 4.2, which is BChargeMAX and I don't want to go higher than that

hurz

10 years ago

As i said, the diode is the limit!

ETJAKEOC

10 years ago

So how do I squeeze more from the diode, slap a few in parallel?

hurz

10 years ago

Take a bigger one. Putting them in parallel is a bad idea because only one of them will take over almost all current. All others are starwing

ETJAKEOC

10 years ago

How's a 400V 6A diode sound? ;)

hurz

10 years ago

Anyway, if the bat is at 3.7v there is 1.3V to bridge! As long its a voltage output and not a current limited one you will get in trouble

ETJAKEOC

10 years ago

So now I need a current sensing circuit to detect when Li-IoncA is reaching a full level (i.e. draws less current) it should cut back the voltage?

ETJAKEOC

10 years ago

This is why I prefer NiCad's, easier to charge xD

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