| 主权项 |
1. A direct AC power converting apparatus comprising:
a converter section configured to convert a three-phase AC input voltage into a DC voltage that includes AC voltage components superimposed on DC voltage components; an inverter section configured to convert the DC voltage from the converter section into a specified three-phase AC output voltage; a first DC link section on an anode side and a second DC link section on a cathode side that are configured to connect the converter section and the inverter section to each other; and a clamp circuit connected between the first DC link section and the second DC link section, the clamp circuit having at least two capacitance elements, wherein the AC input voltage is converted into the AC output voltage by the converter section and the inverter section without generating any smoothed DC voltage, a first period when the capacitance elements are charged by a regenerative current derived from the inverter section and a second period when the capacitance elements are discharged are sequentially repeated, and in the clamp circuit,
the capacitance elements are connected in series between the first DC link section and the second DC link section when the capacitance elements are charged by a regenerative current derived from the inverter section, andthe capacitance elements are connected in parallel between the first DC link section and the second DC link section when the capacitance elements are discharged. |
