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Autodetection of presence of CT on plug-in KRE2 Connector

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  • Autodetection of presence of CT on plug-in KRE2 Connector

    Dear forum, I need to make an autodetect current transformer circuit. I made simulations with an op amp comparator. Basically, if I have Vin < REF I will have output HIGH and if I have Vin > REF I will have output LOW. I have 3 kind of CTs. Voltage outputs CTs: CT1 (100A:0.333V) and CT2(100A:1V) and current output: CT(100A:5A). I need to adjust my resistive mesh to convert current to voltage. This way I can compare if someone plug CT1 and CT2 I will have Vin < REF(2.5V) and output is HIGH. If someone plug current transformer CT3 I will need to convert it between 2.51V-5V, this way I can measure LOW output and then know which CT was connect and treat my signal after it. Someone know how to help me?
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    Last edited by Didan; 05-28-2019, 06:52 AM.

  • #2
    I made this circuit, but I need adjusts.
    Attached Files

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    • #3
      Maybe this is a very wide topic? Maybe if you try to ask simple and specific questions someone could help? It is not my area, but maybe someone will know the answers.

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      • Didan
        Didan commented
        Editing a comment
        I did it. Im think its clear now
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