High-power programmable power supplies

10 June 2015 Power Electronics / Power Management

Murata announced an addition to its D1U4 series of AC-DC frontend power supplies. These programmable units feature a dual I²C interface and controllable bidirectional output isolation. They measure just 41 x 355,6 x 101,6 mm and allow up to four supplies to be contained on a single 1U-high, 19” rack-mounting chassis.

With a 54 V d.c. primary output and a standby 12 V d.c. for powering standby circuitry, the supply accommodates the input range of 90 to 264 V a.c. The main output of each unit 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.

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 hot pluggable and are comprehensively protected against faults including over-voltage, over-current, over-power, over-temperature 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 interface.

The D1U4 series currently comprises two models: a 12 V output model with power ratings of 1200 W, 1600 W and 2200 W, and a 54 V output model with a power rating of 1600 W. It incorporates low-noise fan cooling with automatic speed control, and has a storage temperature range of -40°C to +70°C. The power supplies meet the rigorous EN60950-1 standards, and comply with applicable EMC immunity standards per CQC and TUV.

For more information contact Arnold Perumal, Avnet South Africa, +27 (0)11 319 8600, [email protected], www.avnet.co.za

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