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DRV8301: how to measure the current sensed at the low side shunt of inverter???

vishnu thilack
Prodigy 60 points
Part Number: DRV8301

In the driver 8301 we are using 2 low side shunt current sense.

i wanted to know how to calculate the current sensed in each resistor in those two phases ????

because if we use inline current sense it would directly give the phase value.

in certain switching periods like 110, 101, 011 the two phase currents flows. so what will be the shunt current sensed in those 2 low side shunt current sense????

  • 0
    TI__Guru 65330 points

    Vishnu,

    You can assume that the total current within the three phases adds to zero.

    In other words you can use the known current on the two shunts to calculate the third unmeasured phase current.

    Example: Current is flowing out of phase A (measured by shunt 1) and not seen on phase C (measured on shunt 2), we can assume that the current is flowing into phase B which does not have a shunt. A + B + C = 0 so therefore A + C = -B.

    If exact measured values of the third phase are needed, you can use an external CSA (please let me know if you need a recommendation) or one of our newer DRV devices that support three CSA internally.

    Regards,

    -Adam