Multiload Resonant Inverter With Boosting for All‐Metal Domestic Induction Heating System

ABSTRACT Induction heating (IH) systems have gained significant attention because of their high efficiency, rapid heating, versatility, and precise control. Induction cooking (IC) is one of the primary domestic applications of IH technology. Traditional IC systems typically employ single‐frequency inverters optimized for ferromagnetic (FM) material loads. This approach presents limitations when confronted with various cookware materials including nonferromagnetic (NFM) materials. To address the growing demand for multimaterial load IC systems with enhanced performance and flexibility, a multiload resonant inverter integrated with boosting is proposed with a double full‐bridge three‐leg architecture. The proposed system features three independent legs, each operating at a different frequency to power three different material loads. Integrating this topology with boost functionality enhances performance and optimizes energy utilization. Pulse frequency modulation (PFM) and asymmetrical duty cycle (ADC) control techniques are used to control the load powers independently and simultaneously. A detailed analysis of the inverter and its design procedure is presented. A 1.5‐kW hardware prototype is designed, and the experimental results are in good agreement with the simulation results.