Sourcing 24v output to Open collector input

Discussion in 'General Electronics Chat' started by khatana, Feb 13, 2014.

  1. khatana

    Thread Starter New Member

    Jul 17, 2013
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    Dear All,
    I want to interface sourcing controller output to open collector input as attached drive interface discripotion.
    Please help me which configuration should use to work in solid state technology rather then relay circuit.
    Thanks
     
  2. #12

    Expert

    Nov 30, 2010
    16,345
    6,831
    The drawing you presented seems to be a good design. I have difficulty understanding your question. Are you looking for the part which should be on the left of the drawing you provided? the, "sourcing controller"?
     
  3. khatana

    Thread Starter New Member

    Jul 17, 2013
    6
    0
    Dear Sir,
    I have host controller which switches 24V(+) signal and 0v common and as per servo drive have 24V(+) common and swtches 0V. so i want to design interface circuit which convert input sourching signal to open collector output.
     
  4. ScottWang

    Moderator

    Aug 23, 2012
    4,855
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    There is something wrong about the photocoupler, because when we want to using the the photocoupler, it means that we need isolated from the input to output, so the Anode of LED and the C of phototransistor can't connected together.
     
  5. khatana

    Thread Starter New Member

    Jul 17, 2013
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    Yes you may consider that it is photo transister of opto coupler and there is no connection between led and photo transistor.
     
  6. khatana

    Thread Starter New Member

    Jul 17, 2013
    6
    0
    Dear all,
    I have proposed circuit to convert signal by using opto isolator so please verify me this circuit upto 100KHz signal and is it implementable.
     
    Last edited: Feb 13, 2014
  7. ScottWang

    Moderator

    Aug 23, 2012
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    A common GND is not complete isolation, if that is enough for your application then it's ok, otherwise the GND have to separated.
     
  8. khatana

    Thread Starter New Member

    Jul 17, 2013
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    0
    I have only issue for compatibility which i think working fine.
    I have implement this circuit but it has issue that input resistor (1Kohm) heated during running. And is this circuit behave well at frequency of 200KHz.
     
  9. ScottWang

    Moderator

    Aug 23, 2012
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    Maybe your application no need to use the photocoupler still could working fine, just maybe.
     
  10. inwo

    Well-Known Member

    Nov 7, 2013
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    Yes, it would get hot.
    But you show 10K ohm.:confused:

    Current is already limited by 2K in servo drive.
    If correct, then no other resistor is needed.
     
    Last edited: Feb 13, 2014
  11. ScottWang

    Moderator

    Aug 23, 2012
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    767
    Re-calculating the value of resistor or increasing the value of watt of the resistor to reducing the heat.
     
  12. inwo

    Well-Known Member

    Nov 7, 2013
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    But is the resistor needed?

    Isn't this opto led in series with the 2K and opto led in the servo?
     
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