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BQ77PL900EVM-001: Resistor as test load?

Reynier Serpa
Prodigy 250 points

Part Number: BQ77PL900EVM-001

Hello,

Im wondering if I can use a resistor as the test load in the following figure:

If so what value of resistor would be safe to use. Thank you.

  • 0
    TI__Guru* 81034 points
    Hi Reynier,

    This is possible, but not ideal. Normally, you would want to use an electronic load or a power supply to force a constant current. The current through a resistor will change depending on the voltage of the battery, and you would need a resistor that can handle the power that will be applied.

    Best regards,
    Matt
  • 0 in reply to Matt Sunna
    Prodigy 250 points

    Hi Matt,

    So it is possible to connect a DC Power Supply to act as a charger for my cells at Pack + and Pack -? If this were to actually be implemented into a battery pack that would power a motor would there need to be a split connection at Pack + and Pack - in order to connect to the motor controller and also to the battery charger?

    Sincerely,

    Reynier

  • 0 in reply to Reynier Serpa
    TI__Guru* 81034 points
    Hi Reynier,

    Yes, it is possible to use a DC Power Supply to act as a charger for the EVM Pack+/-.

    In the actual implementation of the battery pack, you would need to carefully control when the charger and motor controller are active / connected. Our battery monitors only track the charge going into and out of the battery. Some charger ICs may include Power path control features, but I am not familiar with how this feature works.

    Best regards,
    Matt