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Solar charging of 3 LiFePO4 cells using BQ24650

Kjetil46144
Prodigy 180 points
Other Parts Discussed in Thread: BQ24650, BQ76PL536

Hi,

I am looking to implement a battery charger using BQ24650 (EVM as a starter), charging 3 LiFePO4 cells from a solar panel, and have a clarification question; what external features will I need and what solutions does TI offer that can provide the functionality I am looking for. The LiFePO4 cells in question does not have any built-in protection whatsoever.

I would obviously need a cell balancing function, and an over-drain and under-voltage protection, but the BQ24650 can take care of the charging algorithm and over-charging protection, am I right?

Any suggestions as to what TI product I might be looking for, or any pointers to existing implementations of the described functionality?

Sincerely,
Kjetil Haarbye

  • 0
    Prodigy 180 points

    Not an immidiate avalance of suggestions here, so I'll go on and make my own so we have a starting point. I am thinking along the lines of an analog front-end BQ76PL536 with SPI to a low-power microcontroller, where the microcontroller also reads an Allegro hall-effect current sensor (ADC or comparator), as well as controls the cut-off MOSFETs. Not as tightly integrated as I might wish, and I have no use for the expandability of the BQ76PL536, but I don't see any better options ATM. Feel free to make any suggestions.