| 摘要 |
<P>PROBLEM TO BE SOLVED: To effectively reduce whole leak current by substitutively processing in other noise reduction circuit, even if abnormality occurs in one noise reduction circuit of a plurality of noise reduction circuits. <P>SOLUTION: "A high level active region" is prepared in addition to "a low level active region" to be normally used, as an active region of a noise reduction circuit 32 for low output, which prepares a cancellation current for a low level leak current of the leak currents generated in a motor 7 of a power conversion apparatus. When the abnormality occurs in a noise reduction circuit 31 for high output, which prepares a cancellation current for a high level leak current of the leak currents, the active region of the noise reduction circuit for low output is switched to "the high level active region." As the result, although the reduction effect of low level is somewhat reduced, the high level leak current affecting an environment can be reliably lowered. <P>COPYRIGHT: (C)2010,JPO&INPIT |
