| 摘要 |
PROBLEM TO BE SOLVED: To detect an abnormal state of a semiconductor switching element mounted to an electric power converter of a battery device that has an electric power charging/assisting function so as to cause a protective operation to promptly work.SOLUTION: An elevator control device 30 in one embodiment includes a voltage detection section 41, a voltage prediction section 42, an abnormality determination section 43 and a protective operation section 44. The voltage prediction section 42 predicts electric power assist amount or electric power charge amount of a battery device 20 on the basis of an operation pattern of a car 4, predicts a current pattern flowing in an IGBT 22a from the predicted electric power, and predicts a Vce voltage value of the IGBT 22a from the predicted current pattern. The voltage detection section 41 detects the Vce voltage value of the IGBT 22a when the car 4 is operated. The abnormality determination section 43 compares the Vce prediction value and detection value with each other to determine an abnormal state of the IGBT 22a. The protective operation section 44 performs a protective operation of the IGBT 22a, on the basis of a determination result obtained by the abnormality determination section 43.SELECTED DRAWING: Figure 1 |
