Powering a pic with 400V

Discussion in 'The Projects Forum' started by Miguel185, Apr 23, 2012.

  1. Miguel185

    Thread Starter New Member

    Apr 23, 2012
    3
    0
    Hi, I need to supply a PIC for a project and the only source I have is a 400V RMS. I heard that there are current sensors that can supply the PIC.

    Anyone knows any of this current sensors?

    Also what would be the best way, both economical and smalest to supply the PIC with 400V RMS.

    Thank you for your patience,

    Regards,

    Miguel
     
  2. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
    99
    You said 400VRMS so this is AC. The only safe way is with a step down transformer feeding a +5V regulated supply circuit.
     
  3. Miguel185

    Thread Starter New Member

    Apr 23, 2012
    3
    0
    Hi, thank u for your prompt answer.
    In fact at 1st we think on that solution but it is too big for what we are developing. We want an efficient but also small solution. A Ac-dc supplie would be a good choice but we cant find any for 400v ac. Our teacher sayd also that there are some current sensores that can supplie the pic but we cant find them. Again thank u for your answer.

    Regards


    Miguel
     
  4. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
    99
    There are other ways of doing it but none that I'd dare post. This is mainly because of safety concerns. 400VRMS is LETHAL, so I wouldn't post anything without an isolation transformer included.
     
  5. Miguel185

    Thread Starter New Member

    Apr 23, 2012
    3
    0
    Hum where could i find a small and cheapest
    Transformer with such redution factor.

    Thks again for Ur aswerr
     
  6. wayneh

    Expert

    Sep 9, 2010
    12,094
    3,033
    Is the teacher suggesting that a hall sensor be used as an isolation transformer? It could work, but would require a somewhat predictable, steady load on the 400v line so that current was flowing.
     
  7. cmwilson7

    New Member

    Apr 24, 2012
    9
    1
  8. cmwilson7

    New Member

    Apr 24, 2012
    9
    1

    Never mind that post.....not what you are looking to do after I read through again. That was zero crossing detection that I used that for, not powering. My bad.
     
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