Powerline communication

Discussion in 'The Projects Forum' started by kacepad, Sep 22, 2008.

  1. kacepad

    Thread Starter New Member

    Sep 22, 2008
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    hi everyone!!! im new in this forum.. i have a project in powerline communication system.. but my adviser said that i would not use any transformer for coupling.. so my only option is to do the capacitive coupling.. our powerline is differential and my output is differential.. my problem is only this part the capacitive coupling.. and its protection on power surge.. is there any capacitive coupling design that all of you can suggest?
     
  2. kacepad

    Thread Starter New Member

    Sep 22, 2008
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    and ohhh... no inductors also... hehehe...
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Greetings! And welcome to AAC!

    I've moved your post into its own thread, where it will draw more responses.

    Please refrain from "hijacking" existing threads with tangent or off-topic questions. You can create new threads for new questions using the "New Thread" button on the upper left of the page.
     
  4. kacepad

    Thread Starter New Member

    Sep 22, 2008
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    im sorry.. im just new here.. and i found a thread bout powerline communication alsoso i just post up.. but tnx anyway.. i really have a problem with the coupling though.. i already burned up one ic because of this coupling method.. hehehe.. hope i could find some help..
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    It's not something I have worked with, but others may be knowledgeable. Here is a link to the Wikipedia article - http://en.wikipedia.org/wiki/Power_line_communication - perhaps good for links.

    Using a cap implies high frequency so the cap doesn't couple in power to the transmitter or receiver. Think of a carrier above 100 KHz.
     
  6. kacepad

    Thread Starter New Member

    Sep 22, 2008
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    yes.. my frequency ranges from 40kHz to 80kHz and im employing fsk transmission.. what bugs me is the protection for voltage surge during plugging the device to the outlet.. the capacitors and resistors have a good job at filtering the 220V 60Hz to almost 20mV but the surge can't be filtered.. i need to design a coupling that can minimize the voltage surge.. and question, what is the equivalent power of the voltage surge? and how does it affect my circuit?
     
  7. kacepad

    Thread Starter New Member

    Sep 22, 2008
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    the capacitors and resistors makes a high pass filter to filter 60Hz while passing the 40kHz and 80kHz...
     
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