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Author Topic: Request: Laptop battery charger  (Read 3072 times)
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nileshhande
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« on: July 27, 2008, 10:03:40 10:03 »

Hi all. Looking for laptop battery charger for RC-project(long backup)
Thanks&Regards.
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Walkura
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« Reply #1 on: July 27, 2008, 08:48:02 20:48 »

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
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« Reply #2 on: July 27, 2008, 09:14:28 21:14 »

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.
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micropar
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« Reply #3 on: July 28, 2008, 01:39:08 01:39 »

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--
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nileshhande
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« Reply #4 on: July 28, 2008, 08:15:07 08:15 »


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.
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Walkura
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« Reply #5 on: July 28, 2008, 09:56:48 09:56 »

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 .
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nileshhande
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« Reply #6 on: July 28, 2008, 12:19:29 12:19 »

@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
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Walkura
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« Reply #7 on: July 28, 2008, 08:21:36 20:21 »

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 Smiley
( and be carefull with mains power  Grin )
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sava
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« Reply #8 on: July 28, 2008, 09:39:24 21:39 »

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