On the Switching Surge in the Current Resonant Inverter for the Induction Furnace Application

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Surges are undesirable with respect to both the reliability and the efficiency of power devices. This study presents the mechanism of surge occurrence in an induction heating power supply. A 2kW full bridge series resonant inverter based on zero-voltage-switching (ZVS) and phase-locked loop (PLL) control is used as a power supply. In this inverter, the modified PLL does not only keep the output current and the voltage in phase but also makes the system operate in ZVS mode. When the PLL mismatches the resonant frequency in a manner of current phase lead, the inverter operates at the non-ZVS mode and the surge voltage heavily affects the switching elements to an extent mainly decided by the recovery energy of the drain-source diode in the power devices. In order to solve this problem, this paper proposes a modified PLL to be the phase error zero.

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