Power loss optimisation of foil coils for induction cooking

Abstract

One of the main problems in induction cooking appliances is the relatively high temperature the inductor reaches. Self-heating is not the only issue, the heat transferred from the pot is also a concern, which elevates the inductor temperature beyond 200/spl deg/C. A copper foil coil in the inductor is considered a good solution for this application. This paper deals with how current distributes in this type of coil, and which are the proper foil section dimensions in order to obtain lower power losses (low temperature rise), with minimum volume of copper (low cost).