Single-phase power converter, three-phase two-phase power converter, and three-phase power converter

摘要

This power converter (1) is provided with: unit cells (11-M) having a semiconductor switch, a DC capacitor (C) and a charge/discharge current I/O terminal; a first arm (12-P) and a second arm (12-N) comprising multiple unit cells (11-M) connected to each other in cascade; an arm connecting unit (13) which has a first terminal to which the first arm (12-P) is connected, a second terminal to which the second arm (12-N) is connected, and a third terminal to which a DC power source is connected; and a transformer (14) which has an AC I/O terminal on the primary side and an intermediate terminal on the secondary side winding, and in which the terminal of the first arm (12-P) and the terminal of the second arm (12-N) are connected to the two end terminals on the secondary winding, and the DC power source (Vdc) is connected to the intermediate terminal.

主权项

1. A three-phase power converter that comprises three single-phase power converters for three phases, wherein the single-phase power converter comprising:
unit cells that each includes: two semiconductor switches that are connected in series; a direct current (DC) capacitor that is connected in parallel with the two semiconductor switches; and input and output terminals of a current that is discharged from the DC capacitor or charged in the DC capacitor in response to switching operation of the semiconductor switches; first and second arms that are each configured by one of the unit cells or a plurality of the unit cells that are cascade-connected to one another through the input and output terminals, the first and second arms comprising a same number of the unit cells; an arm coupling unit that includes: a first terminal to which an end of the first arm is connected; a second terminal to which an end of the second arm is connected; and a third terminal to which an end of a DC power supply is connected; and a transformer that includes alternating current (AC) input and output terminals on a primary side and an intermediate terminal on a secondary side winding, wherein two end terminals of the secondary side winding are connected respectively to a terminal of an end of the first arm to which terminal the first terminal is not connected and a terminal of an end of the second arm to which terminal the second terminal is not connected, and the intermediate terminal is connected to a terminal of an end of the DC power supply to which terminal the third terminal is not connected, and wherein the transformer in each of the single-phase power converter configures each phase of a three-phase transformer that includes a star connection on a primary side and an open star connection on a secondary side, and each of the single-phase power converter is commonly connected to the DC power supply.