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operational amplifier used in a ups(LM324)

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    operational amplifier used in a ups(LM324)

    hello guys
    i repair a ups recently and i was surprised they are using an op amp(LM324) and i wasn't quite sure why they are using it so i tracked the connections using my microscope.
    I came out with a schematic which you will find in the attachments.
    MY question is what might be the function of the op amp here ?
    Also kindly post a quick analysis for the circuit.
    Notes:
    1-pin 4 and 11 are the power supply pins.
    2-If you find something illogical, tell me and i will review the pcb to correct the error in my schematic.
    Attached Files
    Last edited by Alimash; 08-20-2019, 11:59 PM.

    #2
    Re: operational amplifier used in a ups(LM324)

    Having 220v(N)_IN hooked up to pin 8 of the LM324 is illogical...

    Typically these op amps are used to detect phase(and thus availability of line voltage), zero crossings, and overload of the line. Maybe a subset of them. However with questions in the connectivity of the circuit I can't speculate what it's trying to do.

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      #3
      Re: operational amplifier used in a ups(LM324)

      What model UPS?

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        #4
        Re: operational amplifier used in a ups(LM324)

        I figured it out
        It is used to detect voltage
        Thanks a lot

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