• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 63 subscribers
  • Views 1096 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ78350-R1: Recovery mechanism XCHG , XDSG

Adam Botka
Intellectual 455 points
Part Number: BQ78350-R1

Hi all,

my question is how can we recover our BMS to normal condition (DSG is allowed) when the battery is full (XCHG = 1, is set) and then XDSG will set high when OCD has occured.

The expected OCD recovery threshold current is a charge current.

What is your suggestion?

Regards

Adam

  • 0
    TI__Guru 54715 points
    Hi Adam,
    How did your battery reach the full XCHG state before your OCD?
  • 0 in reply to WM5295
    Intellectual 455 points

    Hi WM5295,

    thank you for your answer.

    If the charging process is done, the battery reaches the 100%, then will set XCHG high.

    i,  it should stay low at 100% too ?

    ii, the main question is , how can we recover the OCD protection if  charging is not allowed?

    Best regards

    Adam

  • 0 in reply to Adam Botka
    TI__Guru 54715 points
    Hi Adam,
    You can configure the gauge to lock up the battery, it is not prevented. In cases of abuse you may even want it.
    If you have the charge FET off from charge termination and go to OCD you will have both FETs off. If you have the charge FET turn off with OCD you can also have both FETs off. Recovery in this case could be done by the PACK voltage if the that feature is enabled, or by the PRES input if that recovery option is enabled. See the technical reference manual sections 3.1.4, 3.5, and 3.1.3.
    If the pack is non removable, you could configure the OCD recovery current to be a low discharge current and set the recovery times and latch counts so that the FETs can cool sufficiently between re-try attempts and just recover based on time. If the fault persists the cycling will continue.
    In the case you chose to let the pack lock up, it would need to be unsealed and reset, something you might want to allow only at a maintenance shop.
  • 0 in reply to WM5295
    Intellectual 455 points
    Hi WM,
    thank you for your help!

    I found the right way.

    Adam