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Inverter troubles

Discussion in 'Electronic Design' started by [email protected], Mar 2, 2005.

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  1. Guest

    I have a 12VDC - 240VAC pure sinewave inverter and I want to stop the
    cooling fan from operating when there is no load. The minimum load is
    7W and max load 30W.
  2. Luhan Monat

    Luhan Monat Guest

    By a cheap thermostat from Home Depot. Mount it inside the unit and
    connect it to the fan.
  3. Guest

    why a thermostat? wouldn't u need to measure the load not the
    temperature? so buy a device that will meausure the watts and then when
    it gets above 8 or 9 watts activate the fan
  4. Terry Given

    Terry Given Guest

    you could. But ultimnately all that matters is heatsink temperature - if
    it gets "too hot" turn the fan on; when its "cool enough" turn the fan
    off. Its a whole lot easier and cheaper.

  5. j.b. miller

    j.b. miller Guest

    It may not be as easy as putting a 'stat in the box! If the fan is
    'smart',ie: has a tach pin, then the invertor should shut down if it doesn't
    see the fan spin. At least that's the way I've designed productsthat needed
    fans for cooling.
    Check the fan and see if it has 3 wires, if so, i has a tach in it.
  6. Mac

    Mac Guest

    What is meant by no load? It seems to me that if the minimum load is 7W,
    then there will never be "no load," and the fan will therefore always be
    on in your scheme to "stop the cooling fan from operating when there is no

    Obviously, I'm being too literal-minded, but I am also genuinely perplexed.

    For example, if "no load" really means "7 Watt load," then I guess I
    wonder how you can be sure that the fan is not needed?

  7. Terry Given

    Terry Given Guest

    and if some rat bastard like me implemented a constant-loss algorithm to
    minimise dT, then switching the fan off based on output load would be a
    very bad idea. Highly unlikely in a poxy little inverter though.

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