| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inverter in which a reverse current flowing through a circulation diode can be suppressed sufficiently, and efficiency can be enhanced significantly by significantly reducing power loss. <P>SOLUTION: When circulation currents flow, respectively, through the circulation diodes Du-, Dv- and Dw- on the MOSFETs 4u, 4v and 4w side, reverse voltages are applied from reverse voltage application circuits 5u, 5v and 5w to the circulation diodes Du-, Dv- and Dw-, respectively, before the switching elements of IGBTs 3u, 3v and 3w are turned on. In particular, a voltage V2(=5V) of level lower than the drive voltage V1(=15V) of the IGBT and MOSFET is employed as the operating voltage of the reverse voltage application circuits 5u, 5v and 5w. <P>COPYRIGHT: (C)2007,JPO&INPIT |
