Patent ID: RE39060

Claim:
A power supply device comprising: (a) a rectifier unit for rectifying an output voltage of an AC power supply to convert the voltage into a DC voltage; (b) a reactor connected to the rectifier unit (c) a power factor correction unit for inputting an output voltage of the rectifier unit via the reactor, the power factor correction unit including a switching circuit comprising a plurality of switching elements connected in series and turning on or off to change a current path in the power factor correction unit, a capacitor circuit comprising a plurality of capacitors connected in series, and a reverse-current blocking rectifier element for preventing the charge in the capacitors from flowing reversely when the switching circuit turns on, the switching circuit and the capacitor circuit being arranged in parallel, at least one of connection nodes between the switching elements being connected to one connection node between the capacitors, ends of the switching circuit being connected to ends of the capacitor circuit via the reverse-current blocking rectifier element; (d) a pulse signal controller for generating and outputting a pulse signal to stun on and off each switching element of the power factor correction unit; and (e) a switching driver for receiving the pulse signal to drive the switching circuit of the power factor correction unit based on the received pulse signal.