Absolutely sir, charging ICs is an all in one deal. . .but if you cannot avail those ICs just like me, I think you will do the same What do think is needed to adjust the 0pt current of the ckt. automatically according to its load? Thank youBattery charging ICs will vary charging output based on the batterys chemical make-up, temperature, voltage, current, and even time.
It is an all in one deal.
Hello,
The start of the turns are on the right side for both coils.
I think AWG 22 wire will work.
http://www.hardwarebook.info/AWG
You can use enamel wire on a toroid.
Greetings,
Bertus
A 4V7 ZENER? Anyway, do you think 3v can be boost to 5v without using a inductor? I only need 500ma 0pt. current.You should at least use a diode to drop the voltage to a proper level for charging.
You will need a way to disconnect the charging circuit for a moment to get the voltage of the battery throughout the cycle. The easiest (not the best AT ALL) Would be to set your output by chart. and timer. Many el-cheap-o battery chargers use a timer circuit and thats about it.
If you don't limit the current, regulate the voltage and stop overcharging when the battery is fully charged then the battery might catch on fire. Maybe the 2 ohm resistor will limit the current enough.I put together this booster circuit that seems to do the job
Thank you sir for your reply I really appreciate it. Could your ckt. can be modified to charge LI-ION battery with lessen component without the use of a inductor. What I mean is a charge-pump ckt. using BJT discrete components. So, I think if I will need only 300mA or less charging current to charge a LI-ION battery from a source of 3V7/ 1800mAh, can we make a charge pump ckt. with lesser component and using only BJT discrete components? Thank youI put together this booster circuit that seems to do the job, although it needs more testing and a circuit to detect full charge voltage.
I have more details if there is interest.
Good Luck
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