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BQ76200: BMS configuration

Mike Jung
Intellectual 700 points
Part Number: BQ76200
Other Parts Discussed in Thread: TIDA-00792

Dear Enginner

BAT. Pack capacity is 48V 64A. or 48V 128A.(14cell)

We are going to use bq76pl455 active balacing and bq76200 to implement BMS.

Is this possible by referring to bq76200 circuit in TIDA-00792 and EM1402?

If possible, what should be considered?

Thank you.

  • 0
    TI__Guru 54715 points

    Hi Mike,
    Yes, it should be possible, certainly it is not available as an example in a TIDesign, but there are pieces.
    The bq76PL455 will provide voltage measurement for your MCU to make decisions on pack control.
    The bq76200 can provide high side switching control of FETs, signaling will come from your MCU or logic.  You might consider the switching speed of the bq76200 since internal resistances remain fixed and you may use several FETs to handle the high current. Size the CVDDCP capacitor appropriately and select FETs and thermal management to achieve suitable switching.
    The EMB chipset can be implemented much like EM1402, slightly simpler since there are 14 cells. See also the EM1401 which shows an example of balancing to the stack voltage rather than an external source, many parts are not available but the idea may be helpful.
    The bq76PL455 does not measure current, if desired you will need a circuit to measure current. If very fast control is desired it may need a comparator to go to logic for the driver or could go through the MCU if the timing is suitable.

  • 0 in reply to WM5295
    Intellectual 700 points
    Thank you your reply.

    I have additional question.
    During Active Cell Balancing discharge mode, 12V to the external power supply is changed the 24V.
    There is no external load and no fault signal appears.

    what is the reason?

    Thanks
  • 0 in reply to Mike Jung
    TI__Guru 54715 points
    Hi Mike,
    The question does not seem related to the subject so it may be misdirected. It looks like an EMB1402 question.
    If the external source/load is missing the voltage will rise. If the parts have done their switching properly I would not expect a fault, but I'm not the expert on those parts. The external source/load should be low impedance, if it is high impedance (missing) the balance function is not going to work properly.
    If this did not help, please post again with the IC in question referenced in the title so the post can be directed to more knowledgeable people.