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DRV401: The precision of the current sensor with DRV401 was influnced by busbar movement

jie qian
Prodigy 245 points
Part Number: DRV401

Hello!

i found a big problem, the precision of the current sensor with DRV401 was influenced by the position of the busbar.

normaly, the current on  busbar was 350A, and the output of sensor with  DRV401 was 350A, but if i  move the busbar closel to the probe coils, the output of DRV401 will jump to 360A.

and what factors will lead  to this problem? and can you have any sugestions to avoid or  reduce the this influence ?

  • 0
    TI__Mastermind 26335 points
    Hello Jie qian,

    Thanks for considering to use Texas Instruments in your design. We are looking into your issue and will have a response for you the next business day (Monday 9/16, U.S.A Mountain Time zone).
  • 0
    TI__Mastermind 32140 points

    Hello Jie Qian,

    Thank you for using the forum to get your questions answered.

    I understand what is happening. The bus bar is directly coupling into the probe instead of through the compensation core. There are a few ways to deal with this situation.

    • Change material to have a higher permeability. This will cause the bus bar to couple much more with the core.
    • Decrease the air gap size. This will improve the coupling as well.
    • Change shape of core to reduce coupling from bus bar directly to probe

    You can simulate these effects and see the improvements in your simulations. All you would have to do in your simulation is apply a current on bus bar and a negative current / #windings on your compensation coil. The amount you see flux you see at the probe location is the difference of the coupling. If you change any of the suggestions above you will see an improvement.

  • 0 in reply to Javier Contreras4
    Prodigy 245 points
    Hello javier, we haven't been in touch for a long time.
    Thank you so much for your reply. is it convenient for you to contact me by e-mail, my email: jack_tb@163.com
    so i can show you my simulation results and test result and my core demensions which was confidential.
    1, i had used the high permeability material already.
    2. i decrease the airgap size, and it had positive effect, but not so obviously.
    3.change the shap of the core, how to change ? do you have any specific sugestions? maybe you can see my core shap and demensions first.

    Best regards!
  • 0 in reply to jie qian
    TI__Mastermind 32140 points

    Taken offline for confidentiality of design.