The Decentralized Power DC Unit in the Energy System (Geode) for Telecommunications Equipments

After a general presentation of a new kind of supply systems for telecommunication exchange developped from the A.C. source to DC outputs ; we give an overview of one of its most important subset: the decentralized DC rack ; it will be another opportunity to emphasize concepts like : - short battery autonomy, - use of the redundancy on the exchange, - wide voltage range, - high efficiency, - modularity of batteries, rectifiers, - helps to operation through control/command unit We present also the choice of sealed batteries and the monitoring involved by this technology: - charge/discharge/floating used to increase life time, - automatic testing for the detection of shortage of autonomy. Then the following points are outlined : - the AC wiring and DC coupling of the switching rectifier, - the computer structure for control/command and maintenance functions. * GEODE : Control of the energy and optimization of the equipments.