Power supply design and production
SNN12 - Power Supply System 54 Vdc / 3 x 7,5 A
Description
SNN12 system is power solution designed for telecom, datacom and network applications (48 Vdc nominal) which need to have reliable and permanent DC power supply regardless on main supply failure.
The main parts of SNN12 system are: cabinet, up to two shelves (main and for expansion), and batteries (working and reserve). SNN12 is modular and configurable for different load power: 400, 800 and 1200 W (SN12- main shelf, up to 3 rectifiers units) or 1600, 2000 and 2400 W (two shelves, up to 6 rectifiers units) or 2 ETSI shelves (up to 6 rectifiers). In redundant configuration off power supply system (N+1), reserve rectifier is in parallel work with others rectifiers. Accuracy of rectifiers active current sharing is 5%. Batteries are paralleled with load and system output.
Battery management includes controlled current charging of batteries independent of load current, IU characteristic, automatic temperature compensation with additional cable and sensor and programmable low voltage disconnect.
System overview