ericgibbs said:
hi, hcm,
Tell me the type of opa/comparator you are using?
The quickest solution is going to be if I make a working version of the project,
so that I can tell you the resistor values.
Is the power supply still at +10Vdc?
Is the charger voltage still set for +4.2V?
thats great sir!!! we are 6 members on a group, and i'm the only one who works for our prototype..
we are using LM339 as a comparator, our supply is variable, but on my calculations we use 9.7V as a supply, and 4.2V as the charger voltage.
i think i got the correct resistors to be used.
R1=1k
R2=270
Rh=2200
RL=100k (r5 on the given schematic on previous post, is it ok to use this? previously 1k)
i got a vref(on state)=2.078V and a vref(off state)=1.8907V ( so we can charge batteries with voltage lower than 3.7V or 3.8V )
btw sir, how can we safely discharge li-ion batteries? on our sample batteries we can only got 3.7V.
quick question, our charging voltage is 4.2V and the limitting resistor is 10ohms, and we charge at least 3.7V, the charging current is only 50mAh, is this ok? or is it advisable to charge batteries with constant current? at least 300mah?
EDIT: Original Nokia Li-ion Battery BLC-2
950 mAh LI-ION / 3.6V
Weight: 108g
Talk time: 2h 40 min - 4 h 45 min
Standby time: 55 - 260 h
Variation in operation times will occur depending on SIM card, network settings and usage. Talk times is increased by up to 30% if Half Rate is active, and reduced by 5% if Enhanced Full Rate is active
Picture for reference only
Compatability:
3310/3330, 3410, 3510/3510i, 5510, 6650, 6800, 6810