Front-End Power Supplies for Hot-Plug and Redundant Power Systems

TDK-Lambda's line1600W front-end power supplies are for use in distributed, hot-pluggable and redundantpower systems. The HFE1600 seriesoperates off a universal ac input of from 85 to 265V ac, with active PFC, andprovides a well regulated dc output of 12, 24 or 48V. Operating efficiencies ofup to 92 percent are typical. With the 19 inch rack-mount enclosure as many asfive supplies can be paralleled with automatic load-sharing to provide up to7600W of output power. A popular option is an integral MCU in each supply thatallows for remote programming, monitoring and status reporting via an isolatedI²C and PMBus interface.And, an "energy-saving" feature of the I²C/PMBusinterface is that rack-mounted HFE1600 supplies can be individually turned onor off as the total system load demand varies over time (aka "load-shedding").

The HFE1600 supplies,each measuring 1.61 H x 3.35 W x 11.8 inch L, can be used individually or asmany as five can be mounted in an 1U-high 19 inch rack enclosure to form aparalleled connected, load-sharing, hot-swap, N + M redundant 7.6 kW powersystem. Should a fault occur, each supply has an internal ORing MOSFET switchthat will automatically disconnect it from the load and the other paralleledsupplies. Plus, alarm signals and LED indicators are provided to indentify afaulty unit. For added power, up to two rack-mounted enclosures can be parallelor series connected.

Whenemploying the HFE600-S1U rack-mount enclosure the dc outputs and current-sharelines of each plugged-in HFE1600 supply are automatically connected in parallelwith the others. In this way, scalable and expandable power is achieved, evenin the field. The rack assembly includes two sets of output bus bars, each ofwhich are rated at 200A, for a total of 400A per rack.

Forhigher power applications, up to two power racks containing up to ten modelHFE1600 supplies can be zero-stacked (no space required between racks) andconnected in "parallel" for 15.2 kW of total output power in a compact 2Uvertical space. Likewise, up to two rack-mounted sets with five units each canbe connected in "series" for higher voltage requirements at up to 15.2 kW.

EachHFE1600 supply has two variable-speed cooling fans and can operate in temperaturesranging from -10 to 70C. The airflow is directed from the front of each unit tothe rear where the I/O connector is located.

Forsystem monitoring, opto-isolated signals are provided including dc-OK, ac-Failand Over-Temperature. Front-panel mounted LED indicators provide a visualstatus for dc-OK and ac-OK conditions. A remote On/Off control is alsostandard, as well as remote-sense to compensate for voltage drops in the cablesthat connect the supply outputs to the load. Other standard features includesingle wire current-share and an auxiliary 12V/0.5A output that is diode ORed. Remoteprogramming of the output voltage and current can be accomplished via the I²C and PMBus interface, orwith an external 0-5V signal or a 1k ohm potentiometer.

The 19 inch rack mount enclosureis available with ac inlets via IEC320-C16 connectors or terminal blocks foreach of the five power module slots. All units in the HFE1600Series are fully RoHS-compliant, carry the CE mark and meet UL/EN60950-1 safetyspecifications, as well as EN55022 and FCC level B EMC conducted specifications.The radiated EMC performance complies with Level A requirements.

Keyapplications for the HFE1600 series include data centers, wireless basestations, industrial automation, telecommunications, RF power amplifiers,network equipment, storage systems and distributed power architectures.

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Front-End Power Supplies for Hot-Plug and Redundant Power Systems