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Temperature controller of electromagnetic induction heater and its start system

  • US 6,046,442 A
  • Filed: 09/11/1998
  • Issued: 04/04/2000
  • Est. Priority Date: 09/18/1995
  • Status: Expired due to Fees
First Claim
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1. A temperature controller used for an electromagnetic induction heating apparatus provided with a heating element made of magnetic material and prepared in a fluid passage, a coil prepared in a perimeter of the heating element and a high frequency electric current generator for the coil, said electromagnetic induction heating apparatus having a magnetic transformation temperature where a degree of magnetism decreases when temperature of a magnetic material of the heating element becomes high,said temperature controller, comprising:

  • an electric current detection device measuring an electric current flowing from the high frequency electric current generator to the coil and detecting that a temperature of magnetic material forming the heating element having a temperature reaching in the vicinity of the magnetic transformation temperature; and

    an electric current restrictive device limiting the electric current flowing to the coil based on said electric current detection device.

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