PSO-based power control of two series resonant inverters sharing resonant capacitor for domestic induction heating

Current technology for domestic induction heating requires to deliver a wide range of power (50 W–3.5 kW) to the vessel to be heated. In addition to this, the considered power control strategy must ensure high reachability and compliance with some constraints. This work is focused on applying the Phase Shift Control (PSC) modulation to control the power delivered to two induction loads. The considered topology is based on two half-bridge resonant inverters that control two domestic induction heating loads sharing a single resonant capacitor. The two outputs to be controlled are coupled, leading to a harder control problem. Therefore, a Particle Swarm Optimization (PSO) algorithm based on the gradient information is proposed to perform the power control by considering the PSC modulation. Finally, simulations are discussed and verified with some experimental results obtained in a prototype induction heating system.