Building management installation with standby electric power supply - for interconnected subscriber stations not enjoying priority status for emergency supply in event of mains failure

摘要

A bus (1) links a number of subscriber stations (2), some of which have pref. status for emergency supply from a buffer power unit (6). A transformer (3) in an inductively coupled information branch (4) has one winding (11) wired to the emitter (14) of a transistor (13) in a load-shedding circuit (10). The power branch (5) from the collector (15) is spanned by a capacitor (9) providing the necessary voltage for the station (2). The circuit (10) operates when voltage falls below value. ADVANTAGE - Economical operation is possible with a smaller emergency supply capacity and cost, or corresp. longer emergency utilisation.