High voltage battery measurement using EVAL-AD5941BATZ

Hi, I'm a beginner in hardware.

I would like to use the EVAL-AD5941BATZ  to measure the high voltage battery. It's about 400V, do I just need to change the transistor?

Or should I modify the overall AFE parts?

I'm afraid I've already burst it once. :( 

Please advise how to measure it safely.

Thank you.

  • 0
    •  Analog Employees 
    on Apr 18, 2021 12:22 PM

    Hi Magnetic-R, and apologies for the delay.

    Measuring a 400V battery is NOT a trivial exercise, and is inherently dangerous. I'm not the expert on the CN0510 and EVAL-AD5941, but a cursory look shows that not only will you need to change the excitation circuit, the AC coupling capacitors C36-39 are low-voltage as well. And even if you increase the capacitor voltage rating, the act of simply connecting the circuit to your battery may destroy the circuit as the coupling capacitors are charging.

    While not intended as lab instrumentation, ADI has a whole family of products specifically intended for measuring battery stacks:

    https://www.analog.com/en/parametricsearch/11532#/

    Please refer to the reference designs, as well as any and all safety precautions.

    -Mark