| 摘要 |
<p>The device is intended to the control of an electromagnet comprising a coil (L) connected to a monoarch periodic current supply source, through a controllable switch (TH). Said switch (TH) is controlled by a control circuit comprising a detection member for detecting times crossover of the voltage of the source (R3, D4, IN1, R4, C3) and a switching device (FC) controlled by said detection member in order to deliver to the switch (TH) a closing signal upon the detection of a crossover time which follows the energization control order of the coil (L). The invention applies particularly to contactors and to electro-valves.</p> |
