Power factor correction converter suppressing inrush current using spirito effect

A bridgeless power factor correction (PFC) converter that suppresses inrush current using a Spirito effect, wherein the bridgeless PFC converter has an input connected to an alternating current (AC) power source and an output connected to a load, and comprises:

• a first bridge arm having a first transistor and a third transistor connected in series, wherein a first midpoint between the first transistor and the third transistor has a first terminal connected to the AC power source through a first inductor;
• a second bridge arm connected in parallel with the first bridge arm and having a second transistor and a fourth transistor connected in series, wherein a second midpoint between the second transistor and the fourth transistor has a second terminal connected to the AC power source through a second inductor;
• a third bridge arm connected in parallel with the second bridge arm and having a capacitor and a fifth transistor connected in series;
• and
• a control unit connected to the load, a gate of the fifth transistor, and the AC power source, wherein the control unit controls gate-to-source voltage of the fifth transistor according to input AC voltage of the AC power source and capacitor voltage of the capacitor.