Resonant inverter topologies for three concentric planar windings applied to domestic induction heating

Nowadays users of domestic induction cookers demand heating areas larger than traditional ones because they are able to heat larger pan diameters. These heating areas consist of several concentric planar windings which have to be fed. A possible solution is to replace the traditional single-output inverter topologies by multiple-output inverter topologies. Proposed is a topology for three concentric planar windings based on an electronic board of a domestic cooker and an adaptation board. The different configurations according to the pan diameter are detailed and some experimental results are presented. The proposed topology minimises the semiconductor stress of the devices.