Features and design of the voltage-fed L-LC resonant inverter for induction heating

In this paper the main advantages of the L-LC resonant inverter for induction heating over the conventional voltage-fed SRI are presented: its lower transformer current levels and its short-circuit capability. The design algorithm of the L-LC is presented, and the transformation equations which allow the conversion of the SRI into the equivalent L-LC are deduced, guaranteeing the same working frequency and power dissipation with the same inverter, heating coil and piece. Experimental results are also presented, showing the continuous and reliable behavior of the inverter during the short-circuit.