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Current transformer using a laminated toroidal core structure and a lead frame

  • US 5,425,166 A
  • Filed: 07/19/1994
  • Issued: 06/20/1995
  • Est. Priority Date: 06/01/1993
  • Status: Expired due to Fees
First Claim
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1. A method of making an inductive device comprising the steps of:

  • forming a plurality of metallized coating conductive tracks on a nonconductive substrate, each of said conductive tracks having a first end and a second end;

    forming a toroidal magnetic core overlying said conductive tracks and said dielectric layer on said substrate by using a screening process to print a plurality of annular layers on a ferrite thick film ink onto said substrate and then firing said annular layers to form said toroidal magnetic core;

    coating said toroidal magnetic core with a dielectric layer;

    soldering a plurality of metal conductors of predetermined length having first and second ends joined one to the other by a connector section to form a toroidal coil by soldering the first of each of said metal conductors to the first end of a respective one of said conductive tracks and passing that metal conductor over a portion of said toroidal magnetic core and soldering the second end of that metal conductor to the second end of an adjacent one of said conductive tracks continuing in a like manner until said plurality of metal conductors are joined to said plurality of conductive tracks; and

    removing said connector section from said metal conductors.

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