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Power supplies deliver 6kW in 1U chassis

Posted: 19 May 2008     Print Version  Bookmark and Share

Keywords:ac-dc  power supplies  power density 

Emerson Network Power has launched the UFE series, programmable ac-dc front-end power supplies that provide 22 watts per cubic inch of power density. The UFE series power supplies are offered in a compact 5.5 x 10.7-inch footprint with a height of 1.6 inches, enabling up to three supplies to be contained in a single 1U high 19-inch rack-mount chassis.

The UFE2000, the highest power model in the series, offers a 2-kW output rating, so OEMs and system integrators can now configure individual power shelves with up to 6 kW of available power, or up to 4 kW of redundant power. In addition, the power supplies can be stacked up to 6U high, to provide up to 36 kW of available power.

The UFE series is currently comprised of two models: a 24-Vdc output model with a power rating of 1,300 watts, and a 48-Vdc output model with a power rating of 2,000 watts. The 1,300-watt model offers a wide 90 to 264-Vac input range and can deliver up to 65 A from its main output, while the 2,000 watt model provides a 180 to 264-Vac input, and can deliver up to 52 A from its main output. The main output of each power supply is isolated and floating, enabling positive or negative polarity operation, and provides a hold-up time of 20 ms minimum at full rated power.

The main output is digitally programmable, and users have a choice of standard I2C or advanced PMBus communications. The output of the 48-Vdc model can be adjusted over the 42 to 57-Vdc range, while the output of the 24-Vdc model can be adjusted over the 21 to 28.5-Vdc range. In both cases, the output voltage can be adjusted on the fly, with a set-point accuracy of ±0.5 per cent.

UFE series power supplies employ an advanced power conversion topology. The supplies also use a fixed 450-kHz switching frequency to minimise RFI and maximise efficiency. They provide a full load efficiency of up to 91 per cent. The supplies have no minimum load requirement, and support current sharing via internal ORing FETs. In standard operational mode, the supplies' tight dynamic regulation ensures that the main output voltage will not deviate by more than 2.5 per cent for a 25-per cent step change in load current. However, the supplies also offer a droop compensation mode to help balance current sharing; when enabled, this increases the dc output impedance of the power supply, thereby lowering its output voltage, as the load current increases. The 48-Vdc models have a droop characteristic of 80.6 mV/A from 10 A up to the power limit, and the 24-Vdc model offers a 40.3 mV/A characteristic.

Primarily intended for high availability central office, telecommunications and server type applications such as data centres, the UFE series power supplies incorporate low-noise fan cooling with automatic speed control, and feature an ambient operating temperature range of -33° to +70°. They can cold-start from temperatures as low as -40°. The power supplies meet the EN55022-B and FCC part 15 Class B conducted emissions standards, and comply with applicable EMC immunity standards, including EN61000-3-2 and EN61000-4-2, -3, -4, -5, -6 and -8. The supplies carry VDE EN/IEC60950-1 and UL/cUL/VDE 60950-1 safety approvals.

Prices start at Rs.26,614.01 ($665) for both models in quantities of 100. Sample quantities are available for immediate delivery.

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