This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

  • TI Thinks Resolved

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

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 ?

  • 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).

    Best Regards,

    Patrick Simmons, TI Sensing Products Applications Support

    Getting Started with Current Sensing Video Training Series

    TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs.

  • 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.

    Best Regards,

    Javier Contreras, TI Sensing Products Applications Support

    Getting Started with Current Sensing Video Training Series

    TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs.

  • In reply to Javier Contreras4:

    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!
  • In reply to jie qian:

    Taken offline for confidentiality of design.

    Best Regards,

    Javier Contreras, TI Sensing Products Applications Support

    Getting Started with Current Sensing Video Training Series

    TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs.

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.