| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an inverter device which has instantaneous power interruption restarting function, and which is small-sized, a low cost and has high reliability. <P>SOLUTION: The inverter device includes a control circuit 9 for controlling ON/OFF of main circuit switching elements T1-T6, a first bus bar 4 connected only to switching elements T4, T5 and T6 of the lower arm of a DC bus bar N, a current-detecting means 6 for separating to a second bus bar 5 connected only to diodes D4, D5 and D6 and detecting the current of the switching element flowing to the first bus bar 4, and a current direction discriminating means 8 for detecting the current direction of the output current. The control circuit 9 turns ON only the switching elements T4, T5 at the starting time, and calculates the rotating information of an induction motor 3 from the detection current outputted from the current-detecting means 6 and the output signal outputted from the current direction discriminating means 8. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
