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DRV425: For measuring DC current up to 800A, which hall-IC be recommended?

zehua hu
Intellectual 935 points
Part Number: DRV425
Other Parts Discussed in Thread: TIPD205, , , OPA320, TIDA-00218, DRV5053, DRV5055

Hi,

I want to measure DC current of power-battery，the current will be up to 800A, does TI have a solution?

Thanks!

  • 0
    TI__Genius 14825 points
    zehua,
    The DRV425 is a fluxgate device, which is similar to hall but typically more sensitive. As such, we have found a great way to measure large DC currents with the DRV425 by using two of them inserted into a copper (or other conductive metal) bus bar. There's a TI Design that explains the theory here: TIPD205. There is also an EVM kit that you can get with the DRV425 board and a copper bus bar and mounting hardware with it to evaluate up to 100A right out of the box (DRV425-BUSBAR-EVM).
    There are certainly other options as well, but please take a look at this one and let us know if you're interested or if we should start down another path for your application!
  • 0 in reply to Jason Bridgmon
    Intellectual 935 points
    Hi Jason，
    Thanks very much for your quick response.
    I have read the solution of TIPD205 , I am afraid I can not accept this solution, it use 2*DRV425+1*OPA320, it is too expensive. My taget price is around 2.5$ for the total solution. Can TI have a more cheap options?
    Thanks！
  • 0 in reply to zehua hu
    TI__Mastermind 26475 points

    Zehua,

    A cheaper way is using one of our linear hall sensors and use the B = (µ0*I) /(2*π*r) to calculate the current at a specific distance for a wire.  You could use a concentrator like the TIDA-00218 but that may saturate the sensor.  You would need to calibrate the hall sensor as they are not as accurate as a fluxgate device.  

  • 0 in reply to Javier Contreras4
    Intellectual 935 points

    Hi Javier，

    TIDA-00218 is used to measure AC current, can it measure DC current up to 800A? Do you have any app-notes on this application? 

    Thanks  very much! 

  • 0 in reply to zehua hu
    TI__Mastermind 26475 points
    Zehua,

    The hall sensing element works for DC as it is not a transformer. With your cost restriction this would be the option we have. You will need to change your sensitivity based on your mechanical design. You will most likely not need a concentrator but you will need to calibration for the gain of the DRV5053 and you can evaluate our new DRV5055 that is sampling now.