| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC elevator power control unit capable of preventing the occurrence of a car vibration. and improving the landing accuracy thereof by restraining a current skip at the time of changing over a power converter. SOLUTION: A DC control unit 12 receives a time integrated signal through an integration circuit 15 regarding a difference between an armature current instruction signal IO from a speed control circuit 11 and a feedback current signal IFB detected with a polarity detection circuit 13, a polarity reversal detection signal for the armature current instruction signal IO detected with the polarity detection circuit 13, and a zero detection signal outputted when the feedback current signal IFB detected with a zero detection circuit 14 reaches the vicinity of zero. In addition, transistor drive signals 12a and 12b are outputted to a current skip inhibit circuit 16 as well as a selector circuit 17, when both of the polarity reversal detection signal and the zero detection signal are received, and charge current is fed from the current skip inhibit circuit 16 to the integration circuit 15 over the prescribed time. At the same time, the integrated value of a difference between the armature current instruction signal IO and the feedback current signal IFB is varied by the prescribed value. |
