Emergency procedures in inverter for induction heating of fluids

The paper presents investigation and analysis of the deviation of operating parameters of a resonant inverter for induction heating of fluids and resulting possible emergency situations (cases). Full study of 4 different emergency cases of the considered induction heating inverter is presented. The over currents through the switches are found, as well the slope of the current rising. An approach to protect the inverter in cases of emergency is proposed including an additional inductance LF in series with the input DC voltage source. Analytical derivation of the value of LF is presented, considering the power of the inverter, the switching parameters of the switches and set values of limits of the over currents.