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BQ4050: Power management forum

alec
Prodigy 175 points
Part Number: BQ4050
Other Parts Discussed in Thread: BQ2060A

Hi Expert,

Good day

I have a 3S1P battery pack using bq4050 with CEDV algorithm

The customer uses the laptop to test the accuracy of the gauge by playing the video

The test is failed

Please help to check why the EDV2 and EDV1 set at the same time.

Thanks

Log and gg as attach

EDV2,1 set at same time.xls

CEDV-TEST-2021.10.20.gg.csv

  • 0
    TI__Guru** 105590 points

    Hello Alec,

    I would recommend using the smoothing function, it may help reduce jumps near the end of discharge. Can you share the CEDV report from the GPC CEDV tool as well?

    When certain EDV points are hit the gauge will force the SOC down to match the voltage, it will apply some temperature and current compensation also. And disabling the FIXED EDV0 may help.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 175 points

    Hello Wyatt,

    Thanks for reply

    The SMEN is enabled and you can check gg file.

    I cannot fine the GPC file since this project has been several  months

    Customer uses different SW to run capacity test and  rsoc% drop happens

    Is there any way to fine tune CEDV parameter?  

    I know what CEDV do, I have been using CEDV since bq2060A

    Can bq4050 ignore EDV1 correction like bq 2060A? and using CEDV6_16_init_2000.mcd (MathCAD) to fine tune?

  • 0 in reply to alec
    TI__Guru** 105590 points

    Hello Alec,

    You can also enable SMEXT and SME0 bits for smoothing between the EDV points.

    I'm not sure if the mathcad you mentioned can be used with the BQ4050, I have not used that mathcad tool before. We have all online tools, the GPC CEDV online tool should calculate all the CEDV parameters you need.

    The logs submitted to the GPC CEDV tool should be similar to the actual application loads, if they are not similar it may cause some gauging errors.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 175 points

    Hello Wyatt,

    I tried different setting of smooth, I know correct at 7% is a normal EDV function, 

    Sometimes RSOC% maybe hold at 7% for a while, after that,  6% drop to 3%

    I want to solve this problem.

    Please help me to disable EDV1 (3%) correction function

    Sincerely,

  • 0 in reply to alec
    TI__Guru** 105590 points

    Hello Alec,

    There's not a way to directly disable the EDV1 point. You can increase the delay or change the fixed EDV1 point with the CEDV bit disabled. But it can't be disabled with the CEDV active.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 175 points

    Hello Wyatt,

    ok  thanks