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LMV792 for Arc detection(RD-195)

K.Hamamoto
Guru 12155 points

Hi

Our customer are going to evaluate RD-195 which is arc detection reference board.

There is a test circuit on the board. What do this circuit generate?

I understand  this circuit generate a just simple pseudo arc signal.  

What kind of signal can this circuit generate? I would like to know future of this circuit.

(Our customer are going to generate such a kind of signal by MCU or DSP. )

Regards,

Koji Hamamoto

  • 0
    TI__Genius 14270 points

    Hello,

    The test circuit generates a noise signal which exceeds that of an arcing signal. The noise signal is across the entire detection range of the RD-195.

    It is of course possible to use a MCU or DSP to generate the arc noise. However, on the RD-195 we felt generating the signal from a simple analog system provides a method that will not affect the detection capability of the RD-195.

    As for the future of the circuit, it is a simple and robust circuit that can be used and had been accepted by UL for use in PV arc detection; I do not expect there to be any need to redefine it.

    Regards,


    ChrisO

  • 0 in reply to Chris Oberhauser66
    Guru 12155 points

    Hi Chris-san

    Thank you for your support.

    Regarding the signal of generated by the test circuit, does it need to specify such as, for example, how much the peak voltage or duty of the signal should be?

    On the other hand, as you mentioned this circuit had been accepted by UL. 

    >As for the future of the circuit, it is a simple and robust circuit that can be used and had been accepted by UL for use in PV arc detection; I do not expect there to be any need to redefine it.

     What does this means? Is there any specification on this circuit for UL?

    Regards,

    Koji Hamamoto.

  • 0 in reply to K.Hamamoto
    TI__Genius 14270 points

    Hello Hamamoto-san,

    The self-test circuit is designed to send a noise signal large enough to trigger the detection. The signal amplitude is set to be well above the arcing noise; this circuit is not emulate an arcing signal; rather it ensures that the entire signal chain is properly working.

    The UL acceptance of this circuit is basically - UL has seen this circuit used in many system designs, know its functionality, and have approved systems which use it under UL1699B.

    There is no specification for the self-test circuit from UL. THe RD-195 is a proposed solution for PV arc detection which has been approved in production systems. The self-test circuit is a critical subsytem of the RD-195, which is used to verify that the system is properly functioning.

    Regards,

    Chris O

  • 0 in reply to Chris Oberhauser66
    Guru 12155 points

    Hi 

    Thank you for your support.

    I understood the overview of the test circuit operation as you explained.

    I have one more question. 

      >The signal amplitude is set to be well above the arcing noise; this circuit is not emulate an arcing signal.

          How much the frequency of this noise signal should be?

     

    Regards,

    Koji Hamamoto