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DRV5013: Current detection

Lorenzo Mozzato
Prodigy 10 points
Part Number: DRV5013

Good evening,

I'm working on a project regarding current detection.


The target is to know if there is a DC current flowing in an electrical cable. I just need a binary answer, for example, I > 1A => switch out high; I < 1A => switch out low. The output of the switch will be used as a trigger for another device.
The current could vary from 3A to 1200A and the cable width vary from 5mm to 50mm.
I think a hall switch can be used for this purpose, but I didn't understand how to place it near the cable and if there is a sensor that is capable to detect a current of about 5A.
In addition, the switching behaviour should be fast, order of microsec.

Thanks in advance.

Best regards,

Lorenzo.

  • 0
    TI__Genius 15250 points

    Lorenzo,

    In theory this might work. It really depends on the thresholds you are trying to detect and what your placement constraints are.  For a design like this it will be helpful to model the magnetic fields produced by your conductor(s) at each of the various currents your are considering. You might consider using a tool like Finite Elements Method Magnetics (FEMM) to create a model for your scenario.

    http://www.femm.info/wiki/HomePage

    You can get some details regarding setting up a simulation in the application note here

    http://www.ti.com/lit/an/snoaa04/snoaa04.pdf?ts=1590593307664

    You would want to create a conductor matching your cable diameter and then excite it with the appropriate currents.  You would then need to determine the magnetic fields surrounding the device to find an ideal placement for your sensor. 

    The device will only monitor the portion of the magnetic field normal to the package face, so you would need to break the field into x,y,z components to find the correct vector based on your system geometry.  The magnitude of this vector would need to be large enough to trigger Bop of the sensor. Designing for the Bop Max specification will guarantee all devices toggle at the current level in the simulation.

    Thanks,

    Scott