Programmable AC/DC power supplies offer 12VDC, 54VDC

3rd December 2014

Mick Elliott

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An addition to Murata Power Solutions’ D1U4 series of AC-DC front-end power supplies features a dual I2C interface, controllable bidirectional output isolation. The compact D1U4 measures just 41 x 355.6 x 101.6 mm and allows up to four supplies to be contained on a single 1U-high 19-inch rack-mounting chassis.

With a 54 VDC primary output and a standby 12 VDC for powering standby circuitry, the supply accommodates the very wide input range of 90 to 264 VAC. The main output of each power supply is isolated and floating, enabling positive or negative polarity operation, and has a holdup time of 20 ms minimum at full rated power. Users have a choice of standard I2C or advanced PMBus communications and will benefit from the bidirectional output isolation and PoE compatibility of this product.

The D1U4 series employs an advanced power conversion topology and uses a fixed switching frequency to minimise RFI and maximise efficiency. The supplies have no minimum load requirement, and support active current sharing and bidirectional output isolation via MOSFET. The units are primarily intended for high availability central office, telecommunications, and server type applications, such as data centres.

The power supplies are hot pluggable and are comprehensively protected against faults including overvoltage, overcurrent, overpower, overtemperature, and short-circuit conditions. They also feature extensive remote monitoring and diagnostic facilities – the supply’s output current and voltage, internal temperature, and hours of operation values can be retrieved via I2C or the Power Management Bus (PMBus) serial bus interface.

The AC input D1U4 series currently comprises two models, a 12 VDC output model with power ratings of 1200W, 1600W, and 2200W, and a 54VDC output model with a power rating of 1,600 watts.

The D1U4 series incorporates low-noise fan cooling with automatic speed control, and has a storage temperature range of -40 to +70 degrees Celsius. The power supplies meet the rigorous EN60950-1 standards, and comply with applicable EMC immunity standards, CQC, and TUV. The supplies carry CAN/CSA C22.2.No 60950-1-07 and UL safety approvals.

A DC input model (D1U4CS-D-2100-5x) is also available in size 101.6x343x40mm with a 2,100W output that is designed to deliver reliable bulk power to 54V distributed power systems.

The highest power model in the series with 12 VDC output is the D1U4CS-W-2200-12 and has a 2.2 kW output rating. This allows OEMs and system integrators to configure individual power shelves with up to 8.8kW of available power, or up to 6.6 kW of redundant power. Also, the power supplies can be stacked up to 6U high, to provide up to 52.8 kW of available power.