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Subtractive current measuring method

  • US 7,583,075 B1
  • Filed: 12/05/2006
  • Issued: 09/01/2009
  • Est. Priority Date: 12/05/2006
  • Status: Active Grant
First Claim
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1. A method for monitoring current levels in a power receptacle,the method comprising the steps:

  • connecting a current carrying input wire, a terminal of a power receptacle and a current carrying output wire in series;

    routing the current carrying input wire and the current carrying output wire through a wire-wrapped, toroidal-core current transformer; and

    configuring portions of the current carrying input wire and the current carrying output wire disposed within a plane defined by the current transformer such that the current carrying output wire cancels a portion of the electromagnetic field of the current carrying input wire;

    passing a current through the current carrying input wire; and

    measuring a current generated in the current transformer by the resultant electromagnetic field of the current carrying input wire and the current carrying output wire disposed within the free-space void in the toroidal core.

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