A novel hybrid votage-current fed induction heating power supply system using multilevel neutral point clamped inverter

A novel induction heating power supply topology using multilevel neutral point clamped inverter (MNPCI) is introduced and investigated in this paper. The proposed converter topology decreases the switching losses by lowering the DC link voltage to half its value with the operation under soft switching mode condition. Depending on the modified LLC optimum design being introduced, it shares the advantage features of both voltage fed and current fed inverters with the capability to asborb the undesired parasitic components in the design. The new design involves adding new circuit parameter that helps in controlling the power transfer from the MNPCI to the resonant load tank.