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Noise-limiting transformer apparatus and method for making

  • US 5,956,073 A
  • Filed: 12/19/1996
  • Issued: 09/21/1999
  • Est. Priority Date: 12/19/1996
  • Status: Expired due to Term
First Claim
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1. A transformer, comprising:

  • a magnetic core having at least one input region and at least one output region wherein said input region and said output region are coaxial;

    an input coil for transmitting an input signal, at least a portion of said input coil being wound around at least a portion of said input region; and

    an output coil for transmitting an output signal, at least a portion of said output coil being wound around at least a portion of said output region,said magnetic core capable of flowing a flux that magnetically couples said input and output coils in such a way that said output signal varies in response to said input signal,said magnetic core including a saturation region in no more than one of said input region and said output region capable of a saturation magnetization state whereby said saturation region limits the flow of said flux through said magnetic core and thus the magnitude of said output signal, said saturation magnetization state limiting said output signal in such a way that said output signal does not vary in response to said input signal, wherein said saturation region is one of a geometrically constricted region of said magnetic core or a portion of the magnetic core modified to be the magnetic equivalent of a geometrically constricted region of said magnetic core, wherein said modification is selected from the group consisting of altering the chemical composition of said saturation region, altering the crystal structure of said saturation region and altering the internal stress state of said saturation region in such a way that said saturation region is the magnetic equivalent of a geometrically constricted region.

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