Research on the Command of a Single-Phase Frequency Converter at High Frequencies

The present paper forwards several results obtained during the study of the induction heating installations of metallic materials at high frequencies [1]. It details aspects related to the command of a monophase (half-bridge) inverter with PWM signals (Pulse-With-Modulation). The command of the MOS transistors is done with frequencies ranging between [0÷400] KHz and modulation factor variable within the [0−1] range. The possibility to modify the command frequency of the inverter, as well as the possibility to modify the PWM signal modulation factor allows the user to establish various resonance frequencies for the LC (parallel) circuit which, together with the metallic sample, constitutes the inverter charge