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Analysing 3rd order harmonic

pavithra ramachandran
Prodigy 20 points


My problem is to analyse the 3rd order harmonics which present in the HVAC line.

after that HVAC line(60Hz) ,MOV(Metal Oxide Varistor) will present to avoid the flow of high current  to the components which is connected in the AC line.(eg.Surge Counter).MOV life span will be degraded day by day.Thus leakage current flows through the component. To analyse this we added voltage divider next to that and after reducing the voltage, we need to add filter circuit to pass 180HZ alone with minimum BandWidth. For that I followed Band Pass Filter with Sallen Key Topology.

I have attached the filter circuit with output using TINA software.

Can anyone tell me how to reduce the BW around 20Hz?

  • 0
    Expert 1095 points

    Hi pavithra,

        You can try this in this here . Select 'Bandpass' option in the webench deigner box, click 'start design' and then give your specifications. Any how I attaching the TINA file of it.pavithra.tsc

    If you want to try yourself, I guess you have to choose R and C such that net gain increases(till B.W=20Hz) as gain bandwidth product is almost a constant