Request: Laptop battery charger

[nileshhande]

Hi all. Looking for laptop battery charger for RC-project(long backup)
Thanks&Regards.

[Walkura]

In the elektor of january 2006 they published a laptop charger .
Unfortunatly the file i have of that turns out to be corrupted .
I hope this will get you a bit closer .

Have a nice eve Walkura

[pickit2]

for information only The power supply you get with a laptop is only a power supply. @19V common type.
the battery charging and monitoring is controlled via the laptop.

[micropar]

Hi all,

Visit any SMPS chips mfg such as Power Integration, ST micro, NXP, On-Semi , Fairchild and you find lot of Laptop charger circuits with SMPS.

Regards,
--micropar--

[nileshhande]

Hi, Exactly thats what i looking for.. how to monitor and charge through a 19volt adapter.Also I'm searching for elektor of january 2006(Walkur's reply).is this a individual charger?
Thanks and Regards.

[Walkura]

The elektor schematic concerns a 19 Volt powersupply (switchmode)
When it comes to charging and monitoring the charge process i need some more information .
A : how much cells
B : what chemistry of cells .
C : size of the cell's in Ah .

[nileshhande]

@Walkura
A : how much cells
B : what chemistry of cells .
C : size of the cell's in Ah .
Hi, A:Planning to use 2-3 battery's. B: LI-iON. C: 14.4V, 4400mAh. Thanks

[Walkura]

Good evening nileshhande.

I think you would come to something like this then .
http://focus.ti.com.cn/cn/lit/an/slua097/slua097.pdf
There are dozens of chips to build smps's and lithium ion chargers .
But let me add a few points .
Building a switchmode powersupply is in itself very well possible when you have the acces to an ossciloscope etc.
The power doesnt have to be high for this half a Ampere would do so topswitch ,Fairchild fps anything will do .
(although i would prefer to build forward instead if flyback cause it saves the trouble of gapped cores)

About the charging part there it really doesnt matter which chipset you choose .
For me the criterium would be if its dil sockets .
It can be the TI from the datasheet or some other chip like it.
http://focus.ti.com/lit/ds/symlink/bq2954.pdf
I know Microchip has them too like the 16HV785.

Good luck
( and be carefull with mains power  )

[sava]

http://rapidshare.com/files/133159584/Elektor_01__2006.pdf.html