A comparative evaluation of high-efficiency resonant converters for domestic induction heating

Domestic induction heating enables the pot to be heated directly, reducing heating times and avoiding high-temperature points, increasing safety and cleanliness in the cooking process. In addition, the energy consumption is minimized, reducing the environmental impact. To achieve this, a high frequency current generator is necessary in order to generate the required ac-magnetic field. The efficiency of this electronic converter determines the efficiency of the application, requiring therefore high efficiency power converters. Recent advances in power semiconductor technology, with particular emphasis on wide band gap devices, have allowed new converters with improved efficiency levels. In this paper, these converters will be introduced and comparative evaluation is performed. A special emphasis effort has been made for compare the different issues related with its operation and reliability, including efficiency levels, power losses distribution, and voltage and current stress levels. Finally, the effect of the wide band-gap devices on the conversion efficiency has been evaluated.