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Measureing charging behavior by power supply.

Discussion in 'Electronic Design' started by Boki, May 15, 2007.

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  1. Boki

    Boki Guest

    Hi All,

    I am doing some tests.

    1. Low battery test, I use a poewr supply to replace the battery of
    device, the testing result looks good and correct.

    2. I need to test the charging behavior, I still connect the power
    supply instead of battery of device, when I plug in charger, however,
    the voltage of power supply goes to 5V ( however, I set to 2.8V
    originally ), it should be the USB charger voltage, is there any
    problem ?

    It seems some current limitation, and the device will detect the
    current is already smaller than the expection, cut off charging
    current, is that correct ?

  2. D from BC

    D from BC Guest

    Boki!!! How's it hanging?
    Always a blast to decipher your posts..

    Can your power supply sink current?
    I think most power supplies source current.
    I suspect the USB charger is overriding the power supply.
    In other words the power supply may not control an external V greater
    than its setting..

    For example..IIRC in a linear supply, the pass transistor will shut
    off if an external V is greater than the power supply V setting.

    I don't know the best way to fake a battery...
    Maybe a shunt regulator..???
    D from BC
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