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Wirless Charing problems

Discussion in 'Electronic Design' started by [email protected], Jun 11, 2007.

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  1. Guest

    Hi all,

    I would like to make a wireless charging device which is based
    on
    the reference circuit found in the Internet. Also, these circuits were
    reverse engineered from a toothbrush. I have built the circuits and
    there
    were some problems occurred.

    1). MPSA44 will be extremely hot, say, over 120 celcius!, if
    the
    coil on the battery(schematic1_battery.pdf in
    news://news.wonderfuland.net/) side is
    removed.

    2). MPSA44 will be hot, around 65 celcius, in normal charging
    operation.

    3). Although the circuits can charge the battery, the
    waveform
    across the coil on the battery is not a pure sine wave. Please have a
    look
    on the picture in news://news.wonderfuland.net/.

    4) There are 3 different frequencies existed and they are
    100Hz,
    57.8kHz and 68kHz.

    I just know that there are some kinds of LRC ocilliation in
    high
    frequency about 50kHz. However I dont know why there are 3 different
    frequencies waveform in the circuit.

    I would like to know what is going wrong in the circuit and
    how can
    I improve it? Which components in the circuit can I tune or changed?

    Thanks all. I know it is little bit long....

    Best,
    Michael
     
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