Distributed bulk power front-ends

Electrical Power & Protection

March 2005 Electrical Power & Protection

Emerson Network Power is offering a new line of high-density AC-DC distributed bulk power front-ends from its Astec Power division, a leading merchant supplier of power conversion solutions. With a 12 V d.c. main output and a 3,3 V d.c. standby output, the first of this versatile new DS Series power supplies are available in power ratings of 450 and 550 W, with additional 650 and 850 W models slated for release later this year. A convenient 1U by 2U profile (40 x 78 x 305 mm) enables flexible configuration options to maximise the use of rack space.

The high-density (>10 W/cubic inch) design and high-availability features make the DS Series especially suitable for high-density server applications as well as other data communications, data storage, medical and industrial applications. Featuring full current-sharing capabilities and internal OR-ing diodes for isolation, the DS Series is specifically designed to support hot-swap and redundancy for applications requiring maximum reliability.

With AC input from 90 to 264 V, the DS Series modules feature active power factor correction (typically >0,98) that meets EN61000-3-2 standards for input current harmonic content. The DS Series provides up to 45 A at 12 V d.c. (on the 550 W model) and also offers a standby supervisory output of 3,3 V at 3 A. Each supply has over-voltage and over-current protection, active inrush current limiting circuitry and internal OR-ing diodes. The internally fan-cooled units have no minimum load requirements and include over-temperature protection, remote inhibit and remote sensing on the main output. An I2C communications interface bus provides voltage and current monitoring, remote on/off, and internal fan speed control.

Three display LEDs provide visual status of: AC-OK, DC Power Good, and Fan Fail.

The new DS Series units comply with worldwide safety and performance standards and bear UL60950, NEMKO, CB Reeport, China CCC and CE Marks Designed to NEBS Bell Core standards for electromagnetic susceptibility, the DS units also comply with the latest RoHS and lead-free requirements. The new models operate without derating over a wide temperature range (from 10 to 45°C) and conform to industry standards for shock and vibration. DS units also come standard with a mechanical latch, handle and EMI Clips. Optimised 1U x 2U racks are being designed for the DS Series and will be available in the near future.

For more information contact Micropower Instrumentation, 011 462 1106, [email protected], www.micropower.co.za

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Distributed bulk power front-ends

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