Isolation Transformers

Discussion in 'General Electronics Chat' started by mitchmarsh, Mar 23, 2013.

  1. mitchmarsh

    Thread Starter New Member

    Mar 23, 2013
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  2. ScottWang

    Moderator

    Aug 23, 2012
    5,638
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    If you want to get a power from the city power as AC220V, AC120V, AC110V, for safety reason so you have to use a Isolation Transformer to get the power.

    if you connecting the power directly from the city power, sometime it will happend some unpredictable things.

    One Transformer.
    Vin 220Vac → 220Vac To 220Vac
    Vin 120Vac → 120Vac To 120Vac
    Vin 110Vac → 110Vac To 110Vac

    Two Transformers.
    Vin 220Vac → 220Vac To 110Vac, 110V To 220Vac
    Vin 220Vac → 220Vac To 48Vac, 48V To 220Vac
    Vin 110Vac → 110Vac To 48Vac, 48V To 110Vac
    Vin 110Vac → 110Vac To 24Vac, 24V To 110Vac
     
  3. wmodavis

    Well-Known Member

    Oct 23, 2010
    739
    150
    In a word to "isolate".
     
  4. BillB3857

    AAC Fanatic!

    Feb 28, 2009
    2,423
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    Isolation transformers remove the earth ground reference from the power going to the device connected to the load side. A chassis ground safety line usually carried through and can cause problems to the un-initiated.

    They do for power what an optical isolator does for signals.
     
    absf and Metalmann like this.
  5. nigelwright7557

    Distinguished Member

    May 10, 2008
    508
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    I use one for safety and so I can connect my scope to live four reference.
     
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