Series load resonant phase shifted ZVS-PWM high-frequency inverter with a single auxiliary edge resonant AC load side snubber for induction heating super heated steamer

Abstract

In this paper, a phase shifted PWM controlled full bridge-type series load resonant high-frequency inverter using the IGBT power modules is presented for innovative induction heating applications such as hot water producer, steamer and super heated steamer. The bridge arm side passive capacitor snubber and AC load side active edge resonant snubber-assisted series load resonant soft switching inverter with a phase shifted PWM scheme is evaluated and discussed on the basis of the simulation and experimental results. It is proved from a practical point of view that new multi resonant inverter topology including the improved inverter modifications can expand soft switching area even under low power setting ranges, which is more suitable for induction heated dual packs fluid heater.