Improved power quality SEPIC converter fed series resonant inverter for induction heater

This paper deals with the power factor corrected single ended primary inductor converter (PFC-SEPIC) converter based voltage fed half bridge series resonant induction heater (VFSRI) for domestic induction heating (IH) applications. The front end PFC-SEPIC converter regulates the DC link voltage to a lower value than a conventional PFC boost converter while maintaining improved current power quality at universal input mains. The switch current stress of PFC-SEPIC converter is controlled by operating SEPIC converter in CICM (Continuous Inductor Current Mode) using classical internal current loop and outer voltage loop approach. The SEPIC converter based voltage fed series resonant inverter (VFSRI) converts DC to high frequency (30 kHz) voltage suitable for domestic heating. A 2 kW SEPIC converter based VFSRI with IH load is designed and simulated using MATLAB.