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double secondary transformer

Discussion in 'Electronic Design' started by [email protected], Jan 8, 2008.

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  1. Guest

    hi.....if some one knows about double secondary transformer?for what
    purpose it is used?why it is needed to make it double secondary?
     
  2. ehsjr

    ehsjr Guest

    It allows 2 isolated outputs from the secondary.

    Ed
     
  3. Joel Koltner

    Joel Koltner Guest

    The more secondaries you have, the more output voltages you get. Many
    circuits are a lot easier to built if you have multiple voltages kicking
    around... historically you'd often see something like +5V for digital logic
    and then +15V and -15V for analog circuitry. Even *more* historically it was
    something like +6.3V for tube filaments and -200V??? for cathodes and
    I-don't-know-what-else...
     
  4. D from BC

    D from BC Guest

    If you burn one secondary out,
    you have a 2nd chance with the other. :p


    D from BC
    British Columbia
    Canada.
     
  5. D from BC

    D from BC Guest

    But seriously..

    I've used dual secondary transformers for:

    1) Split supplies
    2) Isolated supplies
    Ex: One for power. The other for floating measurement.
    3) Secondary parallel or series combo for more current or more voltage
    option. (Matched secondaries.)
    4) To make separate supplies for digital and analog.


    D from BC
    British Columbia
    Canada.
     
  6. Phil Allison

    Phil Allison Guest


    ** AC supply transformers are commonly offered with **dual** secondaries
    to give the user several options when they use it.

    1. Wire the secondaries in parallel and double the current.

    2. Wire the secondaries in series and double the voltage.

    3. Wire the secondaries in series and use the centre point as zero volts
    in a split rail (+/-) unregulated supply.

    4. Use the secondaries with separate rectifiers, filters and positive
    voltage regulators and then stack the DC outputs in series for a split rail
    ( +/-) regulated supply.



    ......... Phil
     
  7. Robert Baer

    Robert Baer Guest

    1) use Google.
    2) you need two (possibly different) voltages.
    3) you need some flexibility: center-tapped configuration OR higher
    current configuration.
    4) use Google.
     
  8. D from BC

    D from BC Guest

    This topic might be too odd to find on Google...
    It's too trivial and probably makes for dull web page material.
    Experienced designers know immediately what can be done with dual
    secondaries.
    It's not a study item, it's quickly realized thing.


    D from BC
    British Columbia
    Canada.
     
  9. neon

    neon

    1,325
    0
    Oct 21, 2006
    that is exactly why the secondary winding . are CANEDIANS locos.
     
  10. neon

    neon

    1,325
    0
    Oct 21, 2006
    WRONG again you got a very good short. please do not give advice not unless you know of what you are taling about. YES it is possible to wire them in paralle but ONLY if you know the phasing AND THE VOLTAGES. you may mot tie a 20v into a 10v for instance.
     
  11. neon

    neon

    1,325
    0
    Oct 21, 2006
    secondaries are there for one purpose only. To provide different voltages and/or current out of one transformer. the secondary can be one but can provide multiple voltage taps for your choosing. secondary are also comes with center taps of equal voltage of opposite polarity. want ot know more ask more.
     
    Last edited: Jan 9, 2008
  12. Robert Baer

    Robert Baer Guest

    Ahhh....a homework problem.
    Sorry we (all of us) answered.
     
  13. D from BC

    D from BC Guest

    It's one of those unique homework questions. :)


    D from BC
    British Columbia
    Canada.
     
  14. Guest

    More wire...
     
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