| 摘要 |
The number of semiconductor switches through which output current passes is reduced between a direct current power source side, which is an input, and an alternating current output, thus achieving loss reduction, and enabling higher efficiency, price reduction, and miniaturization of a device. A direct current power source BA1, formed of a series connection circuit of single power sources b1, b2, which has three mutually different voltage levels Vb1, 0, Vb2 including zero is provided with first, second, third, and fourth arm pairs QA1 to QA4, each configured by connecting two arms formed of semiconductor switches Q1 to Q8 in series, an alternating current switch SW1 configured by combining semiconductor switches, and the like, thus enabling a plurality of voltage levels to be selected from and output by an on and off control of these switch elements. |
