Patent ID: 6317308
Filing Date: 2001-11-13
Classification: H01H

Abstract:
A control device of an electromagnet comprising a movable core, with at least one inrush phase during which the electromagnet receives an inrush current, and a holding phase during which it receives a holding current weaker than the inrush current, the device comprising at least one coil connected in series with an electronic switch to the terminals of a supply voltage, means for measuring the current flowing in the coil and means for control of the electromagnet, connected to the means for measuring the current and to a control electrode of the electronic switch and comprising means for regulating the current in the coil during the holding phase, wherein the control means comprise detection means for detecting an unscheduled movement of the movable core of the electromagnet during a holding phase according to the value of the current flowing in the coil when said current is greater than the setpoint value during the holding phase, and means for commanding switching to inrush phase when an unscheduled movement is detected.