Transformer

Discussion in 'General Electronics Chat' started by mermerzac, May 9, 2012.

  1. mermerzac

    Thread Starter Member

    Feb 9, 2012
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    1
    Hi all, the noise produced by my step down transformer is sometimes annoying. May i have some knowledge regarding why the transformer producing noise when i use it for isolation purpose in dc-dc converter?
     
  2. #12

    Expert

    Nov 30, 2010
    16,248
    6,744
    The changing magnetic field makes the iron vibrate.
     
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  3. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,386
    1,605
    Noise is produced by something moving, especially if you have say E and I laminations in the core. A solid toroidal core typically makes less noise, but then even the windings may vibrate.

    You may try coating the entire transformer in varnish to "glue" things together. There are special grades made just for this, usually the entire assembly is dunked then put in a vacuum bomb chamber.
     
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  4. mermerzac

    Thread Starter Member

    Feb 9, 2012
    30
    1

    Oh means the noise cant be avoided in high frequency application, but we can do something like coating transformer in varnish so that the core and winding can hardly vibrate and hence will not produce any sound.
     
  5. crutschow

    Expert

    Mar 14, 2008
    12,977
    3,220
    Sometimes a lamination will become loose which greatly increases the noise, giving a loud buzz type of sound.
     
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  6. mermerzac

    Thread Starter Member

    Feb 9, 2012
    30
    1
    Yeah what I am using for making the transformer is this type of E core kit.
     
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