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Original question:

ISO1211: ISO1211 AC detection

ISO1211: ISO1211 > AC detection with continuous output and ESD, TVS, etc. protection

Sorin valeanu
Prodigy 10 points
Part Number: ISO1211

This electronic desing would be robust enough to withstand a very noisy 120 Vac line, with a 400/120 VAC three-phase transformer as its source. Connected in parallel on this 120 Vac line are the coils from the electric coupling contactors. It is highly susceptible to noise, arcing, spikes, and sudden voltage variations originating from the contactor coils, without deteriorating the ISO1211 inputs, and ensuring a constant output to the MCU for voltage presence detection.

*Gmov = Maximum AC Volts 140 V

I apologize for any mistakes, but the text was generated wit h Google Translate.

  • 0
    TI__Mastermind 29415 points

    Hello Sorin, 

    Thank you for reaching out and no issues with the translation.

    The ISO1211 is a good device to use here. As long as the conditions listed in the recommended operating conditions are not exceed, the device will continue to operate, and it will not be damaged. It looks like you have placed protections circuits to ensure the correct behavior.

    Please know that the isolation performance listed section "6.6 Insulation Specifications" is intended to protect side 1 from Ground Potential Differences (GPD) between FGND and GND1. The device could still experience damage if the transients from the AC line exceeded the conditions listed in the Recommended Operating conditions table or the absolute maximum conditions table. 

    It is also recommended to select an Rthr. Rthr will set the logic thresholds for the device as shown below. 

    Feel free to follow-up if you have further questions. 

    Best,
    Andrew

  • 0 in reply to Andrew J
    Prodigy 10 points

    Thank you very much, I will also place a GDT for additional safety on the input.

  • 0 in reply to Sorin valeanu
    TI__Mastermind 29415 points

    Hello Sorin, 

    Thank you for the update. The schematic looks good. Feel free to create another thread if you have any more questions!

    Best,
    Andrew