| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power conversion device capable of detecting a ground fault generated inside a power converter. <P>SOLUTION: The power conversion device includes: a power converter 3; a first current detector CT1 that is provided on a plus-side input wiring of the power converter; a second current detector CT2 that is provided on a minus-side input wiring of the power converter; a primary delay circuit 6 that averages a detection value of the first current detector and that multiplies a factor smaller than 1; and a comparator 7 that compares the detection value of the second current detector CT2 with a multiplication result of the primary delay circuit 6. When the detection value of the second current detector CT2 is smaller than the multiplication result, a ground fault is detected to stop the operation of the power converter 3. <P>COPYRIGHT: (C)2012,JPO&INPIT |
