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BQ34Z100-G1: Unaccuracy in AveragePower register

CABANTOUS Christopher
Prodigy 140 points
Part Number: BQ34Z100-G1

Hi,

I generated a golden image of my battery but the average power is not right, if I import the log files in Exel and multiply voltage * current the result is not the same as AveragePower column

Sincerely C.Cabantous

TestAccuracy.ods.zip

  • 0
    TI__Mastermind 42535 points
    Hi Christopher,

    No, average power for the gauge is not average current x voltage in log. That is because what is reported in the average power column is the combination of impedance track simulation power that is taken from the current reported in that step. Secondly, both current and voltage are not measured in the same instant of time (the device does not have 2 adc's for that). So, there will be a discrepancy in the reported value.
  • 0 in reply to Batt
    Prodigy 140 points

    Hi, Thank's for the quick answer

    The impedance Track simulation should be pretty close to the reality am I wrong ?

    and even if the voltage and current are not sampled a the exact same time the sample rate should be high enough to have a great idea of the AveragePower right ?

    Finally, it's a coincidence that with an other config, the AveragePower = Voltage*Current ?

    AveragePower Register & AveragePower (Voltage*Current)AveragePowerOK.ods.zip

    Regards,

    C.Cabantous

  • 0 in reply to CABANTOUS Christopher
    TI__Mastermind 42535 points

    Are you using instantaneous voltage and current to calculate power here? If that's so, then you can get the values reported as shown.