Development of a current source resonant inverter for high current MHz induction heating

High frequency industrial induction heating processes typically employ resonant inverters to reach high efficiency at power levels. Advancements in wide band gap (WBG) device technology has made it feasible push the possible of these into MHz regime using solid state technology. Several topologies can be applied, each with advantages and drawbacks. This paper presents a current source inverter (CSRI) employing custom designed module utilizing 1700V SiC MOSFETs for operation high-Q tank heating, which new challenges design. An integrated gate driver structure is demonstrated driving four parallel operation. Theoretical analysis predicts substantial parasitic influence on operation, thus an constructed provide experimental verification while associated CSRI are discussed. In setup, fabricated achieves > 90 % calculated reactive 170 kVA 2.3 kW output during unloaded validating design extension higher loaded