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Inductive heated portable hot plate

  • US 4,996,405 A
  • Filed: 04/17/1990
  • Issued: 02/26/1991
  • Est. Priority Date: 04/18/1989
  • Status: Expired due to Fees
First Claim
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1. A portable inductively heated electric hotplate and an inductive heating power source comprising, in combination,a power source primary induction coil member connected to a source of AC electric power,a glass ceramic plate mounted adjacent said primary induction coil to form a surface on the power source for receiving thereon a portable electric hotplate;

  • a portable electric hotplate having an outer heat conductive hotplate casing;

    a casing top member forming a heating surface;

    a base member made of an electrically insulating material;

    at least one electrical resistor mounted adjacent said top casing member connected to a secondary electric circuit formed within said portable hotplate, said secondary electric circuit having a secondary induction coil member mounted adjacent said base member, connected in parallel with a capacitor;

    said primary and secondary induction coil members being adapted to form a magnetic circuit for transfer of electromagnetic energy when said portable hotplate is positioned on said power source glass ceramic plate; and

    the values for the inductance of the secondary-inductance coil and for the capacitance of the capacitor in the secondary circuit being selected such that the oscillating circuit thus defined in the secondary circuit has a resonant frequency higher than that of the primary induction circuit of the heating power source.

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