Solar Power MPPT to charge/power 3.7V Lithium iPod Battery

CJAEGER

Other Parts Discussed in Thread: BQ24650

Hello,

I am trying to design a system using a 6V solar panel and some kind of MPPT to charge/power a 3.7V Li iPod Battery

I was reading the earlier post on a similar subject but I am somewhat confused on what I would need for my configuration.

Thanks for any advice, it is greatly appreciated.

over 15 years ago

0 Bin Chen36084 over 15 years ago

TI__Intellectual 2295 points

We will have BQ24650, dedicated for solar power charger.

0 Wang5577 over 15 years ago

TI__Guru 56650 points

There is an application notes http://focus.ti.com/lit/an/slua394/slua394.pdf which bases on bq2403x. It may fit your application.

0 marcelo deoliveira over 15 years ago in reply to Wang5577

Intellectual 840 points

Hi Guys,

I am working on a project similar to this one, the solar panel is 6V 1.8W, and battery is 3.6V NIMH 2500 mAh, is there a way to use the same part, and also do you have any sugestion ?

Thanks

0 Wang5577 over 15 years ago in reply to marcelo deoliveira

TI__Guru 56650 points

There are few points we need to know:

1. For Li-ion battery, there is pre-charge stage if the battery voltage is lower than around 3V. We need to think about how to set higher pre-charge current and disable pre-charge safety timer.

2. 6V 1.8W panel only has about 300mA output current. This small current may not trigger the dV/dt or termperature termination for 2500mAh NIMH battery. So, we need be care of the maximum battery voltage setting.

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Solar Power MPPT to charge/power 3.7V Lithium iPod Battery