Transformers

Discussion in 'General Electronics Chat' started by ELEC STUDENT, Jul 12, 2013.

  1. ELEC STUDENT

    Thread Starter New Member

    Dec 31, 2010
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    How does a transformer’s primary windings know when to draw more power? I know that the voltage in the primary and secondary are related by the coils turns ratio. I know that the power in the primary and secondary have to be approx. equal after hysteresis, eddy current, and copper losses. Are these characteristics all related by faraday’s law of induction?
    I am in the middle of building a SMPS that I designed and these are some questions I want to know the answers to. Induced voltage is dependent upon the strength of a magnetic field, the size of a current caring closed loop that this magnetic field passes through, and the rate of change of these two respectively. If the voltage in the secondary gets pulled down, does the current in the primary increase to produce a stronger magnetic field to compensate for this?
     
  2. Wendy

    Moderator

    Mar 24, 2008
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    Google Counter EMF.
     
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  3. nigelwright7557

    Senior Member

    May 10, 2008
    487
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    Yes it does.
    Nigel
     
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