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PHASE SEQUENCE DETECTOR

user6159160
Prodigy 170 points
Other Parts Discussed in Thread: TDC7200

Can any one suggest a Phase sequence detector IC from TI with the following specification. 

INPUT : 3-phase AC 115V @400Hz 

FUNCTION : only to detect the Sequence of 3 phase, it should be 0,120,240 phase shift. Don't need to drive any load. 

OUTPUT: will not be conneted to any load.

  • 0
    TI__Mastermind 24560 points

    This is an interesting application.  In order to make sure that we understand what you are requesting, can you draw the ideal input waveforms and the waveform you wish to create from them.  We support the comparator products from TI, and it is possible that we can create what your application requires with a multi-channel comparator.

    Chuck

  • 0 in reply to Chuck Sins
    Prodigy 170 points

    VG1, VG2,VG4 - AC input 115V @400Hz with 120 degree phase shift from each

    VM4 - OUTPUT. If the Phase sequence in not correct, output should go low. 

    Application - Used to prevent the 3-phase motor to run in opposite direction.

  • 0 in reply to user6159160
    TI__Mastermind 24560 points

    I cannot envision a way to accomplish this with comparators.  Comparators would be appropriate for performing zero cross detection of the 3-phase (essentially converting the sine waves to square waves) but this would not help determine if any of the three phases shifted in time.  I can imagine that a time to digital converter may be useful in determining if the phases shifted.  So I am going to re-route your post to the Sensing team that supports time to digital converters to see if they have any ideas.

    Chuck

  • 0 in reply to user6159160
    TI__Mastermind 27940 points

    user6159160,

    Our Sensing team only offers a time-to-digital converter for time-of-flight (TOF) applications. The TDC7200 measures the elapsed TOF between a single START pulse and up to five STOP pulses. Unless you are only periodically checking if the phase sequence is correct in a given window of five pulses, the TDC7200 cannot support continuous sampling of the phase. In addition, the TDC7200 was designed to be used in DC systems up to 3.6V supply and input signals. Our team doesn't have experience with or offer any time-to-digital converters specific to 3-phase AC systems.