Emerson Network Power Launches 1200 Watt and 2000 Watt Bulk Front-End Power Supplies

Emerson Network Power has launched two new high-efficiency bulk front-end power supplies for systems that use distributed power architectures. Rated at 1200 watts and 2000 watts respectively, the new DS1200-3 and DS2000-3 power supplies generate a main payload output of 12 Vdc and an auxiliary output of 3.3 Vdc for powering standby circuitry. An alternative auxiliary output of 5 Vdc is optionally available. Both power supplies are digitally programmable – they are equipped with an I2C interface and use the industry-standard PMBus communications protocol.

Forming the latest additions to Emerson Network Power’s popular and expanding DS series product line, the DS1200-3 and DS2000-3 are intended primarily for use in rack-mounting server type applications, such as data centres. The power supplies use an advanced power conversion topology to maximize efficiency and have exceptionally compact form factors; both models have a height of just 40 mm (1.6 inches), which makes them ideal for use in 1U high rack-mounting equipment.

DS1200-3 and DS2000-3 power supplies feature a very wide 90 to 264 Vac input voltage range and employ active power factor correction to minimise input harmonic current distortion and to ensure compliance with the international EN61000-3-2 standard – they have a power factor of 0.99 typical. The power supplies also feature active ac inrush control, to automatically limit inrush current at turn-on to 55 A maximum.

Both power supplies employ a new patent-pending ultra high efficiency conversion topology, together with an innovative power transformer and rectifier construction that further improves power density and reduces interconnect power losses. The power supplies’ main +12 Vdc payload output is digitally programmable over the range 11.4 to 12.6 Vdc, and users have a choice of standard I2C or advanced PMBus communications. The control software runs under Windows® on any standard PC, and uses a highly intuitive graphical user interface to simplify power supply set-up.

The DS1200-3 can deliver up to 98.4 A from its main +12 Vdc payload output, and up to 6 A from its +3.3 Vdc auxiliary output. The supply has a 1U x 2U form factor – it measures 28.4 x 8.1 cm, with a height of 4.0 cm – and has a power density of more than 1.3 watts per cubic centimetre. When fed with a 180 to 264 Vac input, the DS1200-3 can achieve a very high – 91 percent typical – conversion efficiency at 50 percent full load.

The DS2000-3 power supply is capable of delivering up to 164.2 A from its main +12 Vdc payload output, and up to 9 A from its auxiliary +3.3 Vdc output. The DS2000-3 has a 1U x 3U form factor – it measures 29.6 x 10.7 x 4.0 cm – and has an exceptionally high power density in excess of 1.5 watts per cubic centimetre. When fed with a 180 to 264 Vac input, the power supply can achieve in excess of 92 percent efficiency between 50 percent and 75 percent full load.

DS1200-3 and DS2000-3 power supplies offer active single-wire current sharing which operates from 10 to 100% of full load, enabling multiple supplies to be easily paralleled for very high current applications. Both supplies are hot pluggable, have no minimum load requirement, and incorporate low-loss internal ORing FETs (Field Effect Transistors) on their main 12 V output, for fault-tolerant and N+1 redundancy applications.

Both power supplies contain a serial EEPROM (electrically erasable programmable read-only memory) that is pre-programmed with data about the unit – including its type, serial number and date of manufacture – to facilitate replacement in the field. A built-in I2C interface, which uses the PMBus communications protocol, enables the data to be read back to the system under power; the interface also allows the system to interrogate the power supply to ascertain various operational parameters, including input and output status, fan blocked or running under-speed, and overcurrent and overvoltage flags.

Emerson Network Power