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DRV425: Skin effect and response time

Vincent Chen64988
Expert 4480 points
Part Number: DRV425

Hi Team,

My customer is surveying large current sensing solution. As they know, once a surge current happen that will has skin effect phenomenon to cause a uneven magnetic field. How can they design a very quick response and accurate current sensing circuit. 

Could team has related documents can share with my customer to study on designing this kind of application.

Thanks a lot.

Vincent Chen

  • +1
    TI__Mastermind 32220 points

    Vincent,

    The best way here is to simulate the results with FEMM.  The reason is the shape of conductor, conductor type, location of sensing and frequency will all change the results as this vary.  Are they using a differential measurement like the bus bar design we have or are they measuring something different?

    If they are using something similar to the DRV425EVM bus bar they can use the FEMM script in the DRV425 product page to create the FEMM simulation and then change the frequency to see the change and the current distribution due to the skin effect.  

  • 0 in reply to Javier Contreras4
    TI__Expert 4480 points

    Hi Javier,

    Thanks a lot for the quick response, I will let customer to study it first. Customer is just in early surveying stage, the solution is not decided yet and I proposed DRV425 as one solution for their reference.

    Best Regards,

    Vincent Chen