| 摘要 |
<p>The device comprises a logic processing unit 14 powered, on the one hand, by the mains P, N and, on the other hand, by a battery 13 intended to replace the mains should the latter fail. The device comprises means 11 detecting a drop in mains voltage below a specified level, and means 12 for switching the battery into circuit. The logic processing unit 14 is designed such that, should the mains supply be interrupted for a long period, the battery is switched out of circuit, so as to avoid rapid running down of the battery, for example in the case where the interruption is by design. The commands given prior to the interruption in the mains supply can be stored, after checking, upon return of the mains supply. <IMAGE></p> |
