Single-phase PFC boost converter operating at instantaneous power interruption

The voltage sags and instantaneous power interruptions are probably the most significant power quality problem facing industrial customers today. In switchmode power supplies, the CCM boost PFC converter, with average current mode control, is widely used as first-stage. However, at the instantaneous power interruption, the controllers go to saturate mode, consequently the switching device (MOSFET or IGBT) may damage permanently at power return after voltage interruption. Therefore, this paper verifies this problem and proposes a simple protection strategy to limit transitory current after power interruption. Simulation and experimental results confirm and validate the proposed control strategy.