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Hand held induction tool

  • US 6,509,555 B1
  • Filed: 11/02/2000
  • Issued: 01/21/2003
  • Est. Priority Date: 11/03/1999
  • Status: Expired due to Term
First Claim
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1. A method for controlling energy delivered by a work coil, said method comprising:

  • (a) providing a heating apparatus having a work coil, and an electrical circuit that provides an electrical current to said work coil;

    (b) emitting a magnetic field from said work coil, increasing a first electrical characteristic of an electrical signal of said electrical circuit to a predetermined first magnitude, and substantially at said predetermined first magnitude, determining a second magnitude of a second electrical characteristic of said electrical signal of said electrical circuit to determine a distance value; and

    (c) based substantially upon said distance value, adjusting said first electrical characteristic and said second electrical characteristic of said electrical signal to emit said magnetic field at a predetermined desired power level.

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