| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power conversion device which suppresses the operation stop of a power conversion means that is caused to occur with an erroneous detection of a fault based on a current. <P>SOLUTION: An IGBT element 110 constituting a power conversion circuit outputs a current signal and a temperature one. A fault detection circuit 130b detects a fault based on the current and temperature signals and outputs an fault signal. A microcomputer 121 outputs a fault output prohibition signal to all fault detection circuits, when performing control for preventing currents from flowing to all IGBT elements. When the fault output prohibition signal is input, the fault detection circuit 130b stops the output of the fault signal forcibly. When control is performed for preventing currents from flowing to all IGBT elements, the detection of a fault never occurs based on a current flowing in the IGBT elements and temperature. Accordingly, by stopping the output of the fault output signal forcibly at this time, the operation stop of the power conversion circuit, which is unevitable in convention devices with erroneous detection of an overcurrent fault or an overheat fault, can be suppressed. <P>COPYRIGHT: (C)2010,JPO&INPIT |
