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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
    the reference circuit found in the Internet. Also, these circuits were
    reverse engineered from a toothbrush. I have built the circuits and
    were some problems occurred.

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

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

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

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

    I just know that there are some kinds of LRC ocilliation in
    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....

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