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Ericsson Unveils New High-Density Digital Power Module for Highly Efficient Power Consumption Control

Ericsson has unveiled the second model in its 32-bit processor-based FRIDA II 3E* digital Advanced Bus Converter (ABC) family: the BMR457. Following the launch last month of its quarter-brick sibling, the BMR456, the new eighth-brick-format BMR457 delivers unprecedented performance to system architects developing equipment for ICT (Information and Communication Technology) applications that require a small footprint, fast response time, tightly regulated intermediate bus voltages and high efficiency at any point of operation to reduce power consumption.

Like the BMR456, the BMR457 includes a 32-bit ARM-based digital microcontroller that embeds the advanced ‘Ericsson DC/DC Energy Optimizer’ firmware. This has been developed by Ericsson to guarantee the highest performance at any point of operation from low to high load, which is commonplace when handling data traffic. The ‘Ericsson DC/DC Energy Optimizer’ firmware combines advanced Ericsson Intellectual Property (IP) together with a series of industry-first functionalities to continually optimize switching parameters and reduce energy consumption to an absolute minimum.

"This is perhaps the first time in the power industry that a company has launched two major product innovations aimed at energy saving in power-demanding applications within a month of each other," said Patrick Le Fèvre, Marketing and Communication Director, Ericsson Power Modules. "Reaching this level of performance with such a fast time-to-market is the combination of extremely efficient cooperation across several disciplines, and leveraging Ericsson’s global capabilities and advanced research into new technologies that contribute to lower energy consumption."

The ‘Ericsson DC/DC Energy Optimizer’ is not just limited to energy management, but also includes a number of features including the ability to handle input voltage transients with slew-rates of up to 0.5V/µs, while keeping the output voltage within ±10% and ensuring that the output voltage does not trigger over-voltage protection. It also offers the highly efficient management of pre-bias start-up operation and a fully controlled shutdown process, avoiding voltage spikes that could cause an avalanche condition in the secondary-side synchronous rectification MOSFET, thereby contributing to improved reliability.

The BMR457 offers a typical efficiency of 95.2% and flat curve behavior from 20% to 100% load: this makes the product the most efficient wide-operational-range Advanced Bus Converter in its category. This high level of performance is a result of the combination of the Ericsson DC/DC Energy Optimizer firmware and the new highly optimized powertrain and embedded transformer layout of the FRIDA II platform. This provides end users with a fully regulated output voltage across the overall operation range from 36V to 75V and without ‘grey zones’ below 40V. This industry-first combination guarantees that systems architects will always obtain the power their application requires without having to be concerned about unregulated behavior.

Designed for flexibility and high-power applications, when connected in parallel, the Droop Load Sharing (DLS) version of the BMR457 telecom (36V to 75V) and datacom (40V to 60V) versions can deliver 522W and 592W, respectively.

In June 2008, through close cooperation with board and systems designers, Ericsson was the first company to release a 21st century 3E power architecture composed of PMBus-compliant ABCs and POL converters that can be fully integrated into the rest of the digital chain of processors and associated components.

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