Importance

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Abstract

A portable electric hotplate is heated by an inductive heating power source having a glass ceramic plate and a primary induction coil. The hotplate has an outer heat conductive casing, the top of which forms a hotplate and the base of which is made from a dielectric material. The top surface of the hotplate is heated by an electrical resistor embedded therein adjacent the top surface, which resistor is connector to a secondary inductive circuit mounted adjacent the dielectric base of the hotplate. The hotplate secondary circuit has an induction coil which serves as the secondary for the electromagnetic field emitted by the primary induction coil in the heating power source. The secondary coil is connected in parallel with a capacitor and the two are connected in series to the electrical resistor embedded in the top surface of the hotplate. The values for the inductance (L) of the secondary-induction coil and for the capacitance (C) of the capacitor in the hotpate are selected such that the oscillating circuit formed by the defined secondary circuit has a resonant frequency slightly higher than the resonant frequency of the primary induction circuit of the inductive heating power source so as to eliminate reflection of capacitive impedance to the primary circuit that would reduce the maximum inductive power available in the secondary circuit.

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