Half-Bridge Series Resonant Inverter for Induction Cooking Application with Load-Adaptive PFM Control Strategy

ABSTRACT - This paper presents an effective control scheme incorporated in the voltage-fed half-bridge series resonant inverter for induction heating applications, which is based upon a load-adaptive tuned frequency tracking control strategy using PLL(Phase Locked Loop) and its peripheral control circuit. The proposed control strategy ensures a stable operation characteristics of overall inverter system and ZVS(Zero Voltage Switching) operation in spite of sensitive load parameters variation as well as power regulation, specially in the non-magnetic heating loads The simulation results and the performance characteristics in the steady-state are shown as compared with the experimental results for a prototype induction cooking system rated at 1.2kW.