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Overvoltage protection

Discussion in 'Electronic Design' started by Piotrne, Feb 11, 2013.

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  1. josephkk

    josephkk Guest

    Easier than you might think. Non-engineer builders have made reliable
    ones DIY. It is a variant of a spot welder.

  2. Piotrne

    Piotrne Guest


    we have solved the problem of overvoltage in the welder.
    There was a basic mistake in the circuit: a missing diode.

    Here is the current version of the circuit:
    with the diode marked in red.

    The diode turns on after turning off the transistor
    and directs the current to the load.

    So - initial attempts to absorb these overvoltage pulses
    were wrong (they may have several kW!) They should be
    directed to the load. Now, everything works as it should,
    even with the ionizer.

  3. josephkk

    josephkk Guest

    Huzzaa! Who would have thought it would be that easy?

  4. Guest

    That should work just fine. There are gasless plasma welders using water now: -not cheap
  5. Piotrne

    Piotrne Guest

    bloggs writes:

    If our attempts to bring the device to work failed,
    the next option was to buy a welder with a spot welding
    function. For example, a Kemppi welder with the MicroTack
    function. This could be even more expensive than this
    plasma welder.

    Hopefully our welder will work correctly. A few things have
    to be done: synchronization with a stepper motor moving
    the electrode, measurement of the current, shaping the
    I(t) function.

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