Patent ID: 8823336

Claim:
A bridgeless power factor corrector electrically connected to an AC power source, comprising: a choke element having a first terminal and a second terminal; a first switch having a first terminal and a second terminal, the first terminal connected to a first terminal of the AC power source and the second terminal connected to the first terminal of the choke element; a second switch having a first terminal and a second terminal, the first terminal connected to a second terminal of the AC power source and the second terminal connected to the second terminal of the choke element; a first diode having an anode and a cathode, the anode connected to the first terminal of the choke element; a second diode having an anode and a cathode, the anode connected to the second terminal of the choke element and the cathode connected to the cathode of the first diode; a capacitor having a first terminal and a second terminal, the first terminal connected to the cathode of the first diode and the second terminal connected to a ground; a first rectify diode having an anode and a cathode, the anode connected to the second terminal of the capacitor and the cathode connected to the first terminal of the first switch; and a second rectify diode having an anode and a cathode, the anode connected to the second terminal of the capacitor and the cathode connected to the first terminal of the second switch; wherein the first switch and the second switch are controlled to be turned on or turned off by a first control signal and a second control signal, respectively, and configured to provide a power factor correction for the AC power source when the AC power source is in a positive half cycle or a negative half cycle.