Discussion in "ARM Development" started by    diana1234    Jul 8, 2014.
Tue Jul 08 2014, 12:36 pm
#1
hello there,
I am using Li-ion battery in my circuit for its backup purpose(18.5Vdc @ 2200mAh).
I want to include a charger circuit in my circuit so that i always get the status of the battery such as-
* when there is need to charge the battery (i will show it by some indication or by some other methode)
* after connecting the charger when battery got full charged (indication of full charging the battery)
* when battery charging completed, it will automatically stops the charging to prevent the over charging. etc....

my circuit have LPC2478 controller.

please help me on this.

THANKS IN ADVANCE
Tue Jul 08 2014, 10:26 pm
#2


I am using Li-ion battery in my circuit for its backup purpose(18.5Vdc @ 2200mAh).

diana1234


Is this Li-ion battery a pre packed battery rather than 6 separate cells ?

If it is you can assume in has all the complicated charger circuitry built in.

You could just use a couple of simple comparators to show high and low voltage
levels.
Wed Jul 09 2014, 10:03 am
#3
yes it is a Li-ion battery packed with 5 cells. each cell has a rating 3.7V @2.2A.

here i want to show - charging is complete / charger connected / charging required etc indications over a LCD Display.
and if i go with battery's votage then it will shows full voltage after connecting charger to it because at that time charger's voltage will be at battery's terminal and the display will show that battery is full.

so please guide me on this.

Thanks in advance
Thu Jul 10 2014, 05:39 am
#4
Which battery pack do you have, and how it it charged at the moment ?
Thu Jul 10 2014, 10:09 am
#5
@ ExperimenterUK
Please find the attached battery datasheet.

Thank you


[ Edited Thu Jul 10 2014, 11:22 am ]
Thu Jul 10 2014, 11:20 am
#6
@ExperimenterUK
Here is the attachment of my power supply section in which, i have to add the charger circuit.
please suggest me where should i have to connect/add the battery charge sensing circuit which is sensed by controller(which have Vcc = 3.3Vdc).

Thanks in advance

Thu Jul 10 2014, 10:10 pm
#7
Why are using an 18 volt battery, why not just use a single cell to power the micro ?
That would be much simpler.
Sat Jul 12 2014, 09:48 am
#8
@ExperimenterUK

Why are using an 18 volt battery, why not just use a single cell to power the micro ?
That would be much simpler.



Because I have an 15V output which I have to operate on attery mode and when charger is connected or when battery is at low voltage, this 15V output will go down.
Also i have to provide backup to the circuit thats why i am using 18V battery and i dont understand how to add the charger circuit in my application.
Please give me suggestion to add the charger, thru which i will get aware about battery's status.
Thank you
Mon Jul 14 2014, 09:27 am
#9
@ExperimenterUK

Sir Please guide me
Tue Jul 15 2014, 01:01 am
#10
Charging a Li-on battery pack is complicated and is best done with a special charger.
Do you have a proper charger ?

Making a charger is not easy, it will need either a custom chip or a micro.

The best solution is probably to use a NiMh battery pack instead.
I understand that it means extra cost, but in the long run I think it is the
most reliable method.
Remember that Li-on cells have a limited life even if charged but not used.


[ Edited Tue Jul 15 2014, 01:01 am ]

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