Impedance Analysis of a Domestic Induction Appliance with Energy-Efficient Cookware

Multi-layer and multi-material induction cookware is increasing market penetration due to its superior cooking performance and efficiency. Resonant converters are usually adopted to achieve an optimal energy transfer at high supply frequency so that the equivalent impedance is a crucial parameter with regard to the system performance. In this work a coupled finite element-circuit model of an induction-efficient appliance is proposed. Equivalent circuit parameters are extracted from the finite element model in order to assess the resonance condition in a typical operating frequency range suitable for designing power electronics. The dependence on materials and layer distribution of the equivalent impedance is investigated by a parametric analysis.