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Choke coil for eliminating common mode noise and normal mode noise

  • US 5,977,853 A
  • Filed: 02/02/1996
  • Issued: 11/02/1999
  • Est. Priority Date: 02/03/1995
  • Status: Expired due to Term
First Claim
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1. A choke coil comprising:

  • a pair of windings;

    a bobbin having a cylindrical body portion around which one of said pair of windings is wound;

    a first magnetic core made of a material having lower permeability for forming a closed magnetic circuit;

    a second magnetic core made of a material having higher permeability for forming a closed magnetic circuit and is a B-shaped core, wherein only a portion of said first magnetic core and only a center most portion of said second magnetic core are located in a hole of said cylindrical body portion; and

    a support member individually supports each of said two magnetic cores.

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