Abstract: Induction heating has superior performance such as fast heating speed, high energy utilization, safety and reliability, and has been widely used in a large number of industries. The working principle of the half-bridge resonant circuit is analyzed in detail with a single-phase half-bridge circuit as the main topology, and the circuit design considerations are given through theoretical analysis and illustrated with simulations for the domestic field. Finally, a 3 kW prototype is fabricated for experiments, and the experiments prove the correctness of the theoretical analysis.

Key words: Induction heating, Series resonance, PFM, Half bridge topology