Power: Hot-swap front end for distributed systems


San Diego, CALambda has launched a 12 V output version of its FPS1000 front-end power supplies for driving non-isolated point-of-load dc-dc converters in distributed power systems without the need for intermediate bus converters. The 12 V output can be adjusted from 10.5 to 13.2 V. The new 864 W model FPS1000-12 complements Lambda’s existing line of 24-, 32- and 48-V output models.

FPS1000-12 supplies–each measuring 1.61 x 5 x 11.4 in.–can be used individually, or as many as three can be mounted in an optional 1U-high 19-in. rack-mount enclosure to form an N+1 redundant and hot-swap power system. In addition, they have integrated OR-ing Mosfet switches that will automatically disconnect a faulty supply from the load (or from other paralleled supplies) should a failure occur.   

Rack-mounted supplies can have different output voltages (such as 12, 24, 32 or 48-V) when installed in the optional FPS-T1U rack, which provides separate output terminals for each supply, or supplies with the same output voltage will be connected together automatically within the FPS-S1U rack. Up to eight supplies can be combined in a current-sharing arrangement between these racks. In either case, the racks can be zero stacked, with no airspace required above or below because cooling airflow is integral to each supply, from front to rear.

For system monitoring, opto-isolated signals are provided– including dc-OK, ac-Fail and Over-temperature – and front-panel LED displays indicate ac-OK, dc-OK or dc-Fail conditions. A remote on/off control is also standard, as well as remote sense to compensate for voltage drops in the cables that connect the supply outputs to the load.  Other standard features include single-wire current-share and an auxiliary 12-V output (diode ORed).  Available options include I2C monitoring of the output current/voltage, internal temperature and alarm status, and front-panel-mounted IEC 320 ac power connectors. 

All models in the FPS1000 series can operate from a universal 85 to 265 V ac, 47 to 63 Hz, or 120 to 360 V dc.

The FPS1000-12 supplies are available now, with prices starting at $400 each in 100-unit quantities.

—Edited by Mark T. Hoske , editor in chief, Control Engineering System Integration eNewsletter
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