Dynamic-Bus-Voltage architecture aims to reduce power consumption in datacenters

October 25, 2012 // By Paul Buckley
At last month’s Electronics Goes Green (EGG) congress in Berlin, Ericsson revealed the ability of the Dynamic-Bus-Voltage Architecture to save power in datacenters. Advanced board-power-consumption monitoring and control technologies enable energy savings of three and 10 percent at board level.

Today, the standard power architecture increasingly being used is the Intermediate Bus Architecture (IBA), which uses intermediate bus converters (IBCs) to convert a traditional 48 VDC distribution-level power line used in telecoms to typically a static 12 VDC. This first ‘down-conversion’ 12 V level feeds a number of DC/DC point-of-load (POL) regulators, which supply the final load voltages at a chip’s logic supply levels of 3 V or below. The choice of 12 VDC has been made to ensure a high enough voltage to deliver all the power required by the board, or load, in times of high data traffic. However, this approach becomes highly inefficient when the traffic demand is low.

The Dynamic Bus Voltage is an evolution of the Intermediate Bus Architecture and provides the possibility to dynamically adjust the power envelope to meet load conditions. By adjusting the intermediate bus voltage, previously the 12 VDC fixed bus voltage, via the use of advanced digital power control the optimized hardware can be combined with an energy-optimizer series of algorithms. This can lead to reductions in both energy consumption and power dissipation, which in turn contributes to a reduction in the amount of cooling that is required.

“Dynamic Bus Voltage is a technology that makes possible to reduce board power consumption from anywhere between three and 10 percent, depending on the board application,” said Patrick Le Fevre, Marketing and Communication Director, Ericsson Power Modules. “The potential for energy saving is a very substantial one, especially when taking into account the fact that 1 W saved at the board level can result in a 3 W saving at the power grid level.”

Advanced Dynamic Voltage Bus Conversion Technology Ericsson 3E BMR456-DBV and BMR457-DBV Advanced Bus Converters claim to offer unprecedented performance and flexibility to system architects developing equipment for information and communication technologies (ICT) requiring smart and efficient board power solutions.

Both of the products feature the ‘Ericsson DC/DC Energy