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Original question:

AMC1350: What would happen if INN is not connected to the ground for AMC1350?

AMC1350: AMC1350

Federico Filosomi
Prodigy 30 points
Part Number: AMC1350
Other Parts Discussed in Thread: AMC3330

Tool/software:

Hi, 

is it possible to use the AMC1350 in the following configuration to measure the Neutral Point Displacement? 

  • 0
    TI__Guru 55232 points

    Hi, 

    Yes this is fine except your VDD1 supply must be referred to GND1. I don't see this circuit on your schematic so I cannot confirm. 

    If this is an issue, AMC3330 may be more appropriate so you don't need an additional isolated power supply. 

  • 0 in reply to Alexander Smith
    Prodigy 30 points

    Well, the VDD1 is an insolated power supply referenced to V_NEUTRAL. 
    So the actual configuration would be this one:



    But i am not sure this will work fine. 


  • 0 in reply to Federico Filosomi
    TI__Guru 55232 points

    Hi Federico, 

    I see, thank you for providing a more complete schematic. Do you need to measure this continuously? 

    As of right now, you have a permanent connection from VAC to Neutral to PE through this resistor divider. 

    You may want to consider adding TPSI2140 type isolated switches such that you can measure Neutral to PE periodically and there is not a continuous current flowing from VAC to PE.