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
    4,856
    767
    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
    737
    150
    In a word to "isolate".
     
  4. BillB3857

    Senior Member

    Feb 28, 2009
    2,400
    348
    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

    Senior Member

    May 10, 2008
    487
    71
    I use one for safety and so I can connect my scope to live four reference.
     
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