Behaviour of series and parallel resonant inverters for induction heating in short-circuit conditions

Series and parallel resonant inverters are the common structures in high power industrial generators for induction heating applications. In practical working conditions, short-circuiting of the heating coil is very common, producing normally overvoltages that can damage the power transistors of the inverter if no special precautions are taken. The aim of the paper is to show the mechanism of how overvoltages are generated under short-circuit conditions of the heating coil for series as parallel inverters.