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Load sensing circuit

Discussion in 'Electronic Design' started by Ed Williams, Jun 16, 2007.

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  1. Ed Williams

    Ed Williams Guest

    I have several switch mode supplies that are supposed to power a
    commercial inductive lamp, via coupling coil/socket, at 2MHz 300VAC. I
    do not have the lamps or coupler, but need to use the supplies for
    another purpose. However, they show no output on the CRO.

    It is unlikely they are all bad. So I am wondering, is it conceivable
    the supplies would incorporate some kind of sensing circuit to prevent
    operation when not connected to the intended load?

    If so, what would be the best bet for getting around this? IOW
    simulating the loading of the lamp and its coupler.

    Thank you for any suggestions.

    Ed Williams
  2. Fred Bloggs

    Fred Bloggs Guest

    It is possible the supplies are expecting the inductive load as part of
    an output series resonant circuit as commonly used in electronic ballast
    circuits...then you get no output without it.
  3. Phil Allison

    Phil Allison Guest

    "Fred Bloggs"

    ** LOL.

    Inductive lamps are not.

    The full name is " inductively coupled, electrodeless, gas discharge lamp ".

    ........ Phil
  4. Fred Bloggs

    Fred Bloggs Guest

    The OP says the lamp requires a socket with a "coil"- that coil is
    almost a certain necessity for the driver circuit, itself a half bridge
    series resonant architecture...
  5. Phil Allison

    Phil Allison Guest

    "Fred Bloggs"

    ** The OP is a fool with no clue.

    YOU are making wild guesses.

    A series resonant cct is non inductive at resonance.

    It ain't a ballast.

    Go away.

    ...... Phil
  6. Ed Williams

    Ed Williams Guest

    The OP says the lamp requires a socket with a "coil"- that coil is
    So I should try winding an air coil and keep adding turns until
    something clicks?

    Where should I start, given the rated 2.5MHz output of the SMPS?

    Ed Williams
  7. Ed Williams

    Ed Williams Guest

    Oh, I just noticed from specs the lamp socket/coupling has a
    cylindrical ferrite core built into it. I suppose then I can wind a
    coil onto this, ping it with a 2.5MHz signal and watch the CRO for

  8. Fred Bloggs

    Fred Bloggs Guest

    It's no secret how these drivers operate as there is a copious amount of
    information published in the application notes and patents. They are all
    in fact half bridge series resonant oscillators. Too bad for you, you do
    not regulate the dissemination of the scientific and engineering
    literature, so that, unlike the clueless adolescents and newbies you
    habitually attempt to bully with your superficial and non-informational
    pretense of expertise, we do not have to rely on you in the slightest.
  9. Phil Allison

    Phil Allison Guest

    "Fred Bloggs Arsehole from Hell "

    ** Go **** yourself - Blog brain.

    The OP's question is totally asinine.

    So are your wild guesses.

    I was smart enough to give him no answer here - rather that a possibly
    wrong or harmful one.

    Go **** yourself - Blog brain.

    ........ Phil
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