POWER FACTOR ADJUSTMENT ARCHITECTURE APPLICABLE TO SINGLE-PHASE/THREE-PHASE POWER GRID, AND CONTROL METHOD THEREFOR

摘要

Disclosed are a power factor adjustment architecture applicable to a single-phase/three-phase power grid, and a control method therefor. The adjustment architecture comprises a three-phase inductor, a three-phase four-wire PFC module and a PFC output capacitor (Cout), wherein one end of the PFC output capacitor is connected to a PFC output negative electrode, and the other end thereof is connected to a changeover switch (K); in a three-phase working mode, three input ends of the three-phase inductor are respectively connected to three live wires of a power grid, and the changeover switch connects the other end of the PFC output capacitor to a PFC output positive electrode (Vpfcout); and in a single-phase working mode, first and second input ends (L1, L2) of the three-phase inductor are connected to one live wire of the power grid, and the changeover switch connects the other end of the PFC output capacitor to a third input end (L3) of the three-phase inductor. In the present invention, an original device is reused, such that the capacity of a PFC capacitor is greatly reduced, the volume of the capacitor is reduced, the cost is reduced, the possibility of subsequent introduction of an electroless design is provided, and the limitations on on-board charging caused by the service life of an electrolytic capacitor are eliminated.