Thermal design optimization of a high-efficiency resonant converter based on multi-MOSFET cells using the Pareto analysis

Induction heating technology provides high performance and efficient systems that are being quickly adopted in industrial and domestic applications. In order to improve such systems, this paper proposes a Multi-MOSFET implementation focusing the efficiency and power density optimization of the resonant converters used to generate the required magnetic field. A thermal and electrical model is provided, and a Pareto analysis is proposed to optimize the design. The proposed design has been implemented and tested through electrical and thermal measurements. As a conclusion, an optimized converter is obtained with improved efficiency which no requires heatsink and/or fan, outperforming current state-of-the-art domestic induction heating converters.