Patent ID: 8169804

Claim:
A three-phase buck-boost power factor correction (PFC) circuit, comprising: a first single-phase buck-boost PFC circuit receiving a first phase voltage of a three-phase voltage and having a first and a second output terminals and a neutral-point for outputting a first and a second output voltages; a second single-phase buck-boost PFC circuit receiving a third phase voltage of the three-phase voltage and coupled to the first and the second output terminals and the neutral-point; a first to a fourth thyristors, each of which has an anode and a cathode, wherein the anodes of the first and the third thyristors and the cathodes of the second and the fourth thyristors receive a second phase voltage of the three-phase voltage, the cathode of the first thyristor and the anode of the second thyristor are coupled to the first single-phase buck-boost PFC circuit, and the cathode of the third thyristor and the anode of the fourth thyristor are coupled to the second single-phase buck-boost PFC circuit; a first output capacitor coupled to the first output terminal and the neutral-point; a second output capacitor coupled to the neutral-point and the second output terminal; and a neutral line coupled to the neutral-point.