| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inverter apparatus for suppressing heat generated from a capacitor, and preventing peripheral components from being damaged if a short-circuit failure occurs in the smoothing capacitor. <P>SOLUTION: A current flowing in the smoothing capacitor 150 is detected. The short-circuit failure is detected in the smoothing capacitor 150 by a capacitor short-circuit detecting circuit 160. When the short-circuit failure is detected, a gate driving circuit 348 makes IGBTs 344<SB>-1</SB>, 345<SB>-1</SB>of a first arm 343<SB>-1</SB>in a power module 342 conductive, and the arm 343<SB>-1</SB>becomes a bypass circuit. Since the resistance of the bypass circuit is drastically reduced by the IGBTs 344<SB>-1</SB>, 345<SB>-1</SB>, a major portion of a short-circuit current flows in the bypass circuit. Since the power module 342 has a constitution for considering heat generation, heat generated from the arm 343<SB>-1</SB>reduces an effect on an environment in comparison with heat generated from the smoothing capacitor 150. <P>COPYRIGHT: (C)2007,JPO&INPIT |
