Driving a transformer with a higher frequency than it's made for?

Discussion in 'General Electronics Chat' started by electronice123, Apr 2, 2010.

  1. electronice123

    Thread Starter Active Member

    Oct 10, 2008
    Just wondering, what will the efffects be if a transformer is driven at a higher frequency that it's intended for long periods of time?

    Will it destroy the transformer???
  2. SgtWookie


    Jul 17, 2007
    If it's at low power, probably nothing bad except lousy efficiency.

    If at high power, really bad efficiency, lots of core losses, heating, and eventual melt-down.
  3. Bychon


    Mar 12, 2010
    All true. It depends also on the frequency. A little bit different means...well, a 60 hz transformer operated at 50 HZ will only pass 5/6 the power when it hits magnetic saturation. Try sending kilohertz through it and you get into crazy things like self resonance and capacitive coupling. Plug it in and keep the power low. It will probably work, but the voltage ratios will be a bit off.
  4. rogs

    Active Member

    Aug 28, 2009
    You might be surprised at just how well some AC 'mains' (ie 50 or 60Hz) transformers perform over a significant part of the audio spectrum.
    Particularly true of toroidal transformers, in my experience. It's surprising just how good some 'mains' transformers can be, connected backwards, to provide emergency 100 volt or 70 volt line audio transformer outputs, for distributed public address systems. Not ideal, you understand, but not bad either -especially where speech only is required!