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DRV425: Measurement of differential current

Gerhard Roedel
Prodigy 30 points
Part Number: DRV425

Difference_current.pdf

  • 0
    TI__Mastermind 26475 points

    Hello Gerhard,

    Thanks for using the E2E  to get your question answered.  

    The best way to get a number of the physical dimensions of the bus bar is by simulation.  FEMM is a great tool and you can use the script provided on the DRV425 tool and software page to get started.  With the tool you can get your initial design done and then copy the bus bar and place it above.  You can then look at the fields in the center and look for the placement you desire.  The FEMM script has a how to get started PDF to guide you on the initial bus bar design.

    The tool allows you to change the dimensions quickly and see the results and the errors that can be associated with placement errors.  You can change the current on one of the bus bars to see the difference you will see.  I believe you have need to calibrate the offset and this may be difficult to get a difference of 30mA across these two.  You would want to get a high field for the differential current.