Combining two DIY Lipo Chargers

[hadihf]

Hi,

I was wondering is it possible to combine 2 separate BQ2057 Chargers by KS, to one as shown in BA's LiPO charger setup?

Regards

[Dan Baldwin]

As you have it drawn (with isolated power supplies for each charger) it should work fine. Apparently you already know that you can't power both chargers from the same source.

Dan

[hadihf]

Thanx for clearing the doubt. The data sheets mentions that both the internal and external voltage dividers for temperature monitoring are referenced to Vcc so I thought may be this can cause problem, Anyway i am goindg to buid one and will post the results here.

Regards

[Dan Baldwin]

If you were using a temperature sensor, it should still work fine, but neither of the schematics you posted show a temperature sensor.

Dan

[dleroi]

Hi,

I was wondering is it possible to combine 2 separate BQ2057 Chargers by KS, to one as shown in BA's LiPO charger setup?

Regards

Hadihf,

I made a similar charger using a different IC. If you are interested, you can see it in this thread (posts 4 and 25):

http://www.rcgroups.com/forums/showthread.php?t=567171

[hadihf]

Hi,

Is there a way to use three independent BQ2057 charger modules and combine these for parallel charging using 12V car battery?? Please see the attachement.

Regards

[hadihf]

Well I found this charger at,

http://www.sprut.de/electronic/modell/lipo/lipo.htm

He is using LM3477 high side N-Channel Controller for his charger.

Regards