A new half-bridge inverter topology with active auxiliary resonant circuit using insulated gate bipolar transistors for induction heating applications

A new IGBT half-bridge inverter topology with active auxiliary resonant circuit (A/sup 2/RC) is proposed. The A/sup 2/RC permits the large lossless turn-off snubber capacitor to be successfully used. Therefore, it makes efficient use of IGBT in the high power and high frequency induction heating system. The operation principle and the design procedures of the proposed A/sup 2/RC are described in detail and the validity is verified by testing on a 55 kHz IGBT half-bridge inverter for an induction heating cooking system rated at 1.3 kW.