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hot swap battery system protection

Mariano
Intellectual 370 points

hi, in the following smart batteries system manager,  batteries packs are hot swappable at any moment ; only one battery charge at time, only one battery power the system at time

we are no sure if it is necesary to put some protection device between smart battery pack connector and the smart switch in order to avoid "noise" related to plug/unplug batteries while the system in powered. 

which device TI recommend for this?

thanks.

  • 0
    TI__Mastermind 42535 points
    Where is your gauge located? Is it on the battery pack? If it is, then your switch will not affect the gauging performance as it's a part of the battery which the gauge already knows the capacity for. However, if you are using a single gauge on the charger side after the smart switch then you have a problem because each battery pack has it's own characteristic impedance that is different from others.

    As far a protectors go, I don't think the gauge is affected by switching transients. However, you may want to check with protectors.
  • 0 in reply to Batt
    Intellectual 370 points
    hi, thanks for the response, my concern is related to switching transients generated by the plug /unplug of battery pack in the board, this esquematic is a simplification, there is a uC on the board that reads smbus protocol of batteries for example that is powered fron VCC_OUT .
    Can switching transients generated by the plug /unplug of battery pack in the board generate perturbations (like noise , induction or others) on VCC_OUT?
  • 0 in reply to Mariano
    TI__Mastermind 42535 points
    Yes, a battery swap can induce transients on the system power line.