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AMC1303E2510: isolated battery voltage measurement

Ian Benton
Prodigy 210 points
Part Number: AMC1303E2510
Other Parts Discussed in Thread: AMC131M03

I am looking for a recommendation (not necessarily the device I mentioned above) to measure the voltage of a 108-cell lead acid battery, which is isolated from the charger control circuitry.

Do you recommend:

Isolated A-D convertor?

Isolation amplifier connected to the A-D input of my microcontroller?

anything else?

I note that providing a power supply on the battery side of the isolation is not completely straightforward!

  • 0
    TI__Expert 5220 points

    Hi Ian,

    The AMC3330 would be a good choice if getting a high side supply is difficult for you.  The AMC33xx devices have integrated DC/DC which provides power to the high side of the device from the low side.  

    Would you be able to provide more details into your system?  What microcontroller are you using, and what accuracy are you trying to achieve?  Some more details would help in determining a specific device and whether an ADC, Modulator, or Amplifier output would be best.

    Thanks

  • 0
    Prodigy 210 points

    It's not really "high side" and "low side", but "live side" and "earth side"

    The microcontroller is a Renesas RA4M1, not one of yours (sorry!) but it has all the same bells and whistles.

    I'm aiming for 1% accuracy, it has to get the float charge voltage accurate.

    I've seen devices elsewhere for energy monitoring (isolated ADCs) which monitor voltage and current, and they would work and I could use the current input to measuring the charging current instead of using a Hall-effect sensor.

  • 0 in reply to Ian Benton
    TI__Expert 5220 points

    Hi Ian,

    Ian Benton said:
    I've seen devices elsewhere for energy monitoring (isolated ADCs) which monitor voltage and current, and they would work and I could use the current input to measuring the charging current instead of using a Hall-effect sensor.

    If this is the case, the AMC131M03 would be able to measure your voltage and current simultaneously and has many adjustable settings for gain and resolution to fit your system requirements.

    Thanks.