Abstract
A high-frequency inverter is proposed and designed for high-power induction heating applications. It consists of a boost chopper, half bridge, and series load resonant circuit. High power is available without increasing the line voltage because the inverter consists of a boost chopper. The boost chopper also works as a part of the inverter circuit. Therefore, three IGBTs, which are included in the boost chopper, half bridge, and the output diode, operate as a full-bridge inverter. The switching operation which are classified into six modes, are illustrated. Soft switching operations of S1 and S2 are obtained by adopting a loss-less snubber capacitor. By using simple equations, the series resonant capacitor is designed for approximately tuning the resonant frequency. The maximum rated power can also be estimated by using these equations, and a simulation is carried out to verify its value. The experimental results using the scale models and the simulation results prove the equations. These experimental results show that the output power of the proposed inverter is higher than that of a conventional one.
