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BQ78350-R1: Question Regarding bq7693000+bq78350-r1 Cell Blancing

joy zhou1
Intellectual 530 points
Part Number: BQ78350-R1

Hi,

I have a question regarding bq7693000+bq78350-r1 application: can the cell balancers be on and running as close as possible to 100% duty cycle whenever cell voltages are above 3.65 V? If it can, how should I configure the cell balancing related parameters in gg file? Please advise.

By the way, in the application, the charger will be always connected with the BMS.

Thanks,

Joy

  • 0
    TI__Guru* 81034 points

    Hi Joy,

    The cell balancing duty cycle cannot directly be controlled in the BQ78350-R1 data flash. The BQ78350-R1 has a cell balancing algorithm that cannot be altered other than the 4 parameters in the TRM (Cell Balance Threshold, Cell Balance Window, Cell Balance Min, and Cell Balance Interval). 100% duty cycle is also not possible because the pins that control the balancing also do the cell measurements. The timing of this is described in the Embedded Scheduler app note: http://www.ti.com/lit/an/slua775/slua775.pdf

    To modify the balancing algorithm, you would need to use an MCU instead of the BQ78350-R1 and develop a different balancing algorithm.

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Intellectual 530 points

    Hi Matt,

    Got it. I am clear now.

    Thanks a lot!

    Joy