Maxim-IC and other Western semiconductor manufacturers make battery charger ICs. I don't know which ones are available in your world.Can u recommend any such ICs?
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Maxim-IC and other Western semiconductor manufacturers make battery charger ICs. I don't know which ones are available in your world.Can u recommend any such ICs?
That is exactly what we wish to do.. Charge the battery whenever power is available and use the battery to charge the mobile whenever necessary.. And thats y i need to know whether i have to regulate the current flowing from the LiPo battery to the mobile and if yes, how do i regulate it?What we mean is that there is no need to have a battery between the cellphone and the regulator.
The cellphone has its own battery and charging control. If you supply it with 5 V it will charge, and it won't overcharge.
If you want to store power in a battery, and at a later time charge a cell phone from the battery, it is a lot more complicated.
If you can afford it and do not need to worry about if you can get it tomorrow i suppose Maxim is ok... fact is they keep EVERYTHING on the books as active... even if they only run the silicon once a year!Maxim-IC and other Western semiconductor manufacturers make battery charger ICs. I don't know which ones are available in your world.
Hi again,
Here is a basic design. You can decrease the first resistor to get more max current out to charge faster.
You can eliminate the parts associated with the blue LED if you dont need the LED indicator, which gives you an idea when the cell is charged.
Note that as is, the charge current is about 150ma or so, so the LM317 does not need a heat sink. If you increase the output current it will need a heat sink though.
Also, the LED is either a blue or white one, but possibly two red LEDs in series will also work ok.
Thanx a ton.. Now one more question.. How do i control the current that is flowing out from the charged battery to the Mobile Phone. i.e the discharge speed? I heard that a rapid rate of discharge will also blow up the battery or make it completely useless...
And u've given 9v as the i/p supply but actually the supply will be a lot less at around 5v...
Can i use the same circuit with a different IC or do i have to change it?
And i'l also like to know the answer to Mr.Hero9999's question too...
Experts always say to turn off the charger when the charging current of a Lithium battery gets low. They say that trickle charging a lithium battery must never be done. look at www.batteryuniversity.com .
Your circuit must limit the charging voltage to 4.2V per cell, the battery cell does not limit the voltage and is a fire hazzard if charged to a higher voltage.
Hi there Hero
To make the point about overcharging or trickle charging more clear, let me ask you this:
If you had a cell that measured 4.000v would you mind putting it on a charger that put out 10ma? In other words, that would be a very small current relative to the usual current it would normally be charged at like 500ma or 750ma or even 1000ma. Now 10ma would be too slow of course so we wouldnt want to wait around,
but it would charge at least a little right? So would you mind charging at this level if it didnt take so long?
Lithium-ion battery - Wikipedia, the free encyclopediaCharging is usually stopped when the current goes below 0.03C but it can be left indefinitely depending on desired charging time.
Battery charger ICs are designed by many engineers who discuss EVERY catastrophe and eliminate them all. They are used in many consumer products.The charger circuit you've posted is only suitable for use by those who know what they're doing, not the average clueless user.
The charger circuit you've posted is only suitable for use by those who know what they're doing, not the average clueless user.
I'm sure a couple of comparators could be used to reduce the charging current at 3V and disable the charger if the voltage is below 2.5V.
Battery charger ICs are designed by many engineers who discuss EVERY catastrophe and eliminate them all. They are used in many consumer products.
Why not use one?