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Low Frequency Power Line communication

mujahid muhammad
Prodigy 140 points
Other Parts Discussed in Thread: TMS320F28PLC84, AFE031

Hi


I have just started working on a project that involves Power line communication, main requirements are

Power line voltage 600V, 50/60 Hz, if possible also 400Hz.

This high voltage supply line is not connected to power distribution so violating any allocated frequency band is not an issue.

Distance between terminal is 3km, bit more is required for head room

Ideally modulation scheme is BELL 202 standard (FSK 1200/2200Hz Mark/space) or as close as possible in terms of frequency modulation and baud rate.

I have looked around but was unable to find something in that low frequency range. The lowest and nearest I can see is TMS320F28PLC84 + AFE031 reference design but it is recommended for 35kHz to 90 kHz frequency range.

If anyone can suggested reference design that need minimum changes.

Thanks in advance

M Mujahid

  • 0
    TI__Genius 10255 points

    hi Mujahid ,

    The TMS320F28PLC84 + AFE031 reference design supports on 230V / 110 volts ,  such a high voltage of 600V may not be supported by any of the PLC kits that we have .

    why is it that you are looking at working at such high voltages ?

    also is there a limit on the freq spectrum you use ( "but it is recommended for 35kHz to 90 kHz frequency range." )?

    Regards.

  • 0 in reply to MEGHANA MANAVAZHI
    Prodigy 140 points

    Thanks Meghana

    That is exactly why I have asked about it if there is something available?

    A 600V, 3km and FSK BELL202 are all customer requirement and the product is for a very niche market (i can not disclose full detail because of NDA).

    Modifying AFE031 reference design for 600V is doable by changing coupling transformer and capacitors etc. I haven't found anything which suggest that low frequency transmission could be a problem using AFE031. All the graphs are showing 10kHz upward but frequency response is a straight line on 10kHz which indicates that there is no build in high pass filter. Although external band pass filter need to adjusted.

    I have been working on it and so far i can see that software modem (e.g. MSP430) + AFE031 + modified Mains coupling circuit will do it. Any suggestion?

    Regards,

    M Mujahid