Method and circuit for changing capacitance value of output capacitor of power factor corrector

摘要

A method for changing a capacitance value of an output capacitor of a power factor corrector (PFC) includes applying AC power to a power conversion circuit. It is sensed whether an instantaneous power failure occurs in the AC power. Output capacitors of the PFC of the power conversion circuit are connected in parallel to each other to increase capacitance values of the output capacitors, when it is sensed that the instantaneous power failure does not occur in the AC power.

主权项

1. A circuit for changing a capacitance value of an output capacitor of a power factor corrector (PFC), the circuit comprising:
a first capacitor provided at an output terminal of the PFC and having a first terminal and a second terminal; a second capacitor having a first terminal and a second terminal; a first switch having one terminal connected to the first terminal of the first capacitor and another terminal connected to the first terminal of the second capacitor; a second switch having one terminal connected to the first terminal of the first capacitor and another terminal connected to the second terminal of the second capacitor; and a third switch having one terminal connected to the second terminal of the second capacitor and another terminal connected to the second terminal of the first capacitor.