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zinc-air battery emulator.

Discussion in 'Electronic Design' started by [email protected], Mar 30, 2007.

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  1. Guest

    hello everybody,

    i would like to start for thanking for taking the time to read this
    little discussion of mine!
    my aim is to produce a battery emulator, and not just any battery
    emulator but a zinc-air battery emulator. what i basically have to do
    is get a mathematical model of a battery and implement it in hardware:
    a power source, a microcontroler, some D/A and A/D converters some
    temeperature sensors (which i might actually drop) and voila my
    battery emulator ;).

    in order to acheive this i have undertaken some EIS analysis of the
    batteries and am pretty close to getting an equivalent circuit that
    fits very nicely with the measured data. i plan from this equivalent
    circuit to obtain a transfer function for my system in the s domain.
    now here comes the question! what i need your guys input for is to
    figure out how i can make a feedback for my system. it is not enough
    to just have a transfer function because without a feedback the output
    will stay constant...diferent from input naturally but constant over
    time. this feed back however has to be sensitive about the load of the
    system and in this way reduce the input voltage so that the output
    voltage gets modeled in the way a battery would modulate its output
    voltage dependant on the load. i have no idea where i should start to
    think about how my feedback system should look like.
    this seems very difficult to me and i need some suggestions about how
    i can tackel the problem!!
    any idea will be greatly appreciated!

    THANK YOU SOOO MUCH FOR YOUR TIME!!
     
  2. colin

    colin Guest

    If your feedback needs to monitor the current in the load,
    this can be a simple low value resistor in series with the laod so it doesnt
    reduce the voltage to much
    and an op amp to amplify the small voltage.

    its fairly simple, theres many ways to do it,
    if you look in many op amp datasheets there are numerous examples,
    or search for 'current sense amplifier' etc.

    Colin =^.^=
     
  3. aleximas

    aleximas Guest

    thank you for your answer collin, it opened my eyes to be quite
    frank :)! thank you again and 5 stars from me
     
  4. colin

    colin Guest

    |- Skjul tekst i anførselstegn -
    |
    | - Vis tekst i anførselstegn -

    |thank you for your answer collin, it opened my eyes to be quite
    |frank :)! thank you again and 5 stars from me

    your most welcome :)
    if you still have trouble im sure we can help more,
    incidently you dont need such a low voltage as I was thinking.
    becuase you can easily compensate for the voltage drop by increasing the
    output voltage by the same amount.

    if you have plenty of supply volts and your load is isolated you could have
    a resistor dropping say 1 volt at max current and drive the mcu a/d
    directly.

    Colin =^.^=
     
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