Front-end supplies

Emerson has launched two bulk front-end power supplies for systems that use distributed power architectures.

Rated at 1200 and 2000 W, the DS1200-3 and DS2000-3 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 and are equipped with an I

²C interface and use the PMBus communications protocol. The devices are intended primarily for use in rack-mounting server-type applications, such as data centres. The supplies use power conversion to maximise efficiency and both models have a height of 40 mm. They feature a wide 90 to 264 VAC input 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 supplies also feature active AC inrush control, to automatically limit in current at turn-on to 55 A. Both supplies use an ultra-high-efficiency conversion topology, together with a power transformer and rectifier construction that further improves power density and reduces interconnect power losses. The 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 PMBus communications. 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 and has a power density of more than 1.3 W cm³. When fed with a 180 to 264 VDC input, the DS1200-3 can achieve a 91% typical conversion efficiency at 50% full load. The DS2000-3 can deliver up to 164.2 A from its main +12 VDC payload output and up to 9 A from its auxiliary +3.3 VDC output. It has a power density of more than 1.5 W per cm³. When fed with a 180 to 264 VAC input, the supply can achieve more than 92% efficiency between 50 and 75% full load.