High power programmable AC-DC power supplies, up to 2.2 kW

December 04, 2014 // By Graham Prophet
Murata has expanded its D1U4 series of AC-DC front-end power supplies; the programmable supplies features a dual I²C interface, with controllable bidirectional output isolation. The D1U4 measures 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 auxiliary circuitry, the supply accommodates an 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 msec minimum at full rated power. Users have a choice of standard I²C or advanced PMBus communications and the product offers PoE compatibility.

The D1U4 series employs an advanced power conversion topology and uses a fixed switching frequency. The supplies have no minimum load requirement, and support active current sharing and bidirectional output isolation via MOSFETs. The units are primarily intended for high availability central office, telecommunications, and server type applications. 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 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 54 VDC output model with a power rating of 1,600W.

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 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 101.6 x 343 x 40 mm 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 with a 2.2 kW output rating. This allows OEMs and system integrators to configure individual power