Patent attributes
A power conversion apparatus is obtained which detects a mis-connection of optical fiber cables based on a difference in mode of feedback signals, and changes a phase sequence in an automatic manner only with the use of a logical composition of a microcomputer control section. A drive circuit 2 for driving a semiconductor device 1 includes a test signal recognition section 31 that outputs inherent feedback signals 32 in response to a test signal 30 from a microcomputer control section 3. The microcomputer control section 3 includes an optical fiber mis-connection detection section 29, 33 that detects a mis-connection state of the optical fibers 8 based on the inherent feedback signals 32. The optical fiber mis-connection detection section compares the inherent feedback signals 32 with the individual normal feedback signals stored beforehand, respectively, and detects a mis-connection state of the optical fibers 8 when it is indicated that at least one inherent feedback signal does not coincide with a corresponding normal feedback signal.
