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Cost-effective solutions for domestic induction heating appliances have become a priority in recent years. With this purpose, the implementation of Printed Circuit Board (PCB) inductors has entailed important research efforts. A proper litz structure is essential to achieve high-efficiency PCB inductors. This structure requires routing the traces by using vias in a double layer PCB to obtain the appropriate transposition pattern. In this paper, the optimal number of vias has been analyzed to minimize the power losses in the coil. This analysis has been carried out based on numerical calculations whose results have been experimentally verified. [ABSTRACT FROM AUTHOR]

We present an analytical model of the equivalent impedance of an n-turn planar winding sandwiched between top and bottom multilayer media. Although the model's general and compact notation is valid for all systems involving magnetic dipoles and stratified media, perhaps its main application is domestic induction heating systems. The proposed model is based on the vector potential solution of a single-turn coil located between two multilayer media, and this result is extended to n-turn coils. We demonstrate the applicability of the model by a variety of examples. We present experimental results to justify the theoretical model. [ABSTRACT FROM AUTHOR]