1/(tuf) ???

Discussion in 'Homework Help' started by Engr1144, Oct 14, 2013.

  1. Engr1144

    Thread Starter New Member

    Oct 5, 2013
    8
    0
    HI,
    This statement is quite confusing:
    "1/TUF SIGNIFIES THAT INPUT TRANSFORMER IF PRESENT MUST BE 1/TUF TIMES LARGER THAN THAT WHEN IT IS USED TO DELIVER POWER FROM A PURE AC SINUSOIDAL VOLTAGE."

    Can any 1 explain its meaning.
    thnx
     
  2. WBahn

    Moderator

    Mar 31, 2012
    17,715
    4,788
    Uh, it would sure help to have some context.

    Basically, as I understand it, the goal is to avoid saturation of the core by taking into account the details of how the transformer is utilized (such as center-tapped full-wave versus half-wave) or with loads/sources that deviate strongly from sinusoidal, such as switched mode supplies, since these have larger peak currents (and hence fields) relative to the powers involved.
     
  3. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    I doubt the OP will return, but presumably the question relates to comparison of equivalent power delivery to the same (resistive) load under two conditions - for example: directly through the transformer as a simple AC secondary load or "indirectly" [say] for the case of a half-wave rectifier utilizing a single rectifier diode.
    The Transformer Utilization Factor in the latter simple half-wave rectifier case would be notionally 0.286, meaning one would be over-sizing the transformer by a factor of approximately 3.5 when comparing with the case of a purely AC secondary connection to deliver the same effective load power.
     
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