| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a highly reliable capacitor device detecting a fault of a change-over switch and a diode. <P>SOLUTION: The change-over switch 17, diode 21 and change-over switch voltage detecting circuit 25 are arranged in a discharge route of a power accumulation part 13. A control part 27 turns on or off the change-over switch 17 in a prescribed condition and takes in voltage (Vc) of the power accumulation part 13 and voltage (Vs) of a second connection point 23 from a charging circuit 9 and the change-over switch voltage detecting circuit 25 at on-time and off-time. Thus, the fault of the change-over switch 17 is detected, and abnormal heat generation of the diode 21 can be detected when voltage (Vs) of the second connection point 23 exceeds an operation threshold of the diode 21 at off-time of the change-over switch 17. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
