Predictive Control of Inductor Supplied by High Frequency Inverter for Induction Heating Application

Induction heating depends on several independent parameters such as the supplied energy, the heating time, the geometry of the piece to be heated, and the frequency of power supply. This latter strictly affects the variation of the power which depends directly on both the square of the current induced in the load and on the frequency. For this purpose, the supply of induction heaters needs to use high frequency converters as a suitable solution. The control of the inductor’s current requires development of advanced control techniques to ensure an acceptable precise regulation, with high efficiency and speed. In this research, a mathematical model of induction heating is represented with using the assembly (inductor-load), followed by the scheme of the chosen HT inverter, where, resonance is applied by a compensation capacitor in series with the load. Subsequently, the adapted predictive control laws are synthesized in order to control the current of the inductor, consequently, the power supplied to induction heating. The results of the simulation have shown the effectiveness of the control strategy.