Single FET AC Relay - Possible

Discussion in 'General Electronics Chat' started by Management, May 6, 2009.

  1. Management

    Thread Starter Active Member

    Sep 18, 2007
    306
    0
    I know there are Solid State Relays to pass AC but is there way to wire up a single FET to block AC current when the FET is off?

    I know I can use a single one to pass that AC current but that inherent diode in the FET won't completely block AC current in both directions.

    Any way around that with one FET? Been trying to figure out a few tricks but can't.

    And no I don't want to use anything else. Just want to see if this is possible.

    Thanks.
     
  2. nanovate

    Distinguished Member

    May 7, 2007
    665
    1
    Does it need to pass AC when it is on?
     
  3. Management

    Thread Starter Active Member

    Sep 18, 2007
    306
    0
    Yes.

    I can make one FET pass AC when it is on but the issue is only when it is off does it not complete block AC. Is there anything I can do to get around that while using only one FET?

    Thank you.
     
  4. nanovate

    Distinguished Member

    May 7, 2007
    665
    1
    Nope the body diode will always conduct
     
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