• Industry’s first 750W Hybrid Regulated Ratio DC/DC converter wins two awards from Electronic Products China
• High-power-density quarter-brick PKM-NH gains ‘2013 Top-10 Power Product’ and ‘2013 Technology Innovation Product’ awards
• Quarter-brick module delivers high power density of 31.12W/cm3 per cm3 (508W per cubic inch)
• Highly-innovative regulated-ratio topology module delivers high-efficiency flat-curve characteristics of up to 97%
Ericsson has been named as a winner in two categories in the annual Electronic Products China Top Product Awards. The industry’s first 750W Hybrid Regulated Ratio (HRR) DC/DC converter – the PKM-NH platform – was named in both the ‘2013 Top-10 Power Product’ and ‘2013 Technology Innovation Product’ award categories by the magazine. Implementing the new hybrid-regulated topology, the PKM-NH platform is optimized for datacom board applications that have a 52V/54V system bus distribution and require regulated high-power quarter-brick-format intermediate bus converters able to deliver up to 750W.
The awards are recognition of the company’s world-class expertise in consistently developing innovative and highly efficient products that significantly reduce the environmental impact of electronics equipment. Ericsson has finely honed the efficiency of its research and development activities across the company, implementing a lean and agile RD methodology. This has resulted in shortened feedback loops, improved communication and rationalized processes across all the company’s product development, including its leading-edge technologies used in digital power modules.
“The development of the PKM-NH platform is a result of the extremely close cooperation between Ericsson R&D and product development centers in Sweden and China to deliver this innovative technology and product in an exceptional fast timeframe,” said Patrick Le Fèvre, Marketing and Communication Director, Ericsson Power Modules. “This is the first time that has Ericsson won two awards within the Chinese electronics industry, which is a clear recognition of the high level of innovation being demonstrated by Ericsson.”
Hybrid Regulated Ratio (HRR) Technology
The increased demand for high-power DC/DC converters in the datacom industry is pushing power density to unprecedented levels, requiring designers to explore new possibilities in power conversion technology. To meet the challenge of packing a 750W regulated DC/DC converter in a quarter-brick format, Ericsson has developed an innovative proprietary topology known as Hybrid Regulated Ratio (HRR). The topology combines two power-control methods – voltage-regulation and ratio-regulation – resulting in high performance across the input voltage ranges used in datacom systems, which are usually between 40V to 60V.
The HRR topology implemented in the Ericsson PKM-NH platform delivers an excellent response to line or load transients and guarantees the output voltage will remain stable and immune from voltage deviation due to power disturbances on the system bus voltage. This means it retains intermediate bus voltage integrity within the tolerance band required by power system architects.
Offering a power density of 31.12W/cm3 (508W/in3), the PKM4717NH is the first product in the PKM-NH series and is the most advanced regulated DC/DC power module for datacom applications. The module operates with an input voltage range of 40V to 60V and delivers an output voltage of 10.8V at 70A within the operational system voltage between 50V and 60V. Below 50V, in its regulated-ratio mode, the output voltage self adjusts for optimal operation and secures a stable voltage even though the system bus voltage could be operating in abnormal mode. Retaining a stable and regulated voltage while the system bus runs its normal operational voltage becomes a highly important capability to avoid traffic disruption and also to provide enough time for system monitors to take required action, either to turn on redundant power units or potentially to shut down part of the system.
A product of Ericsson’s ‘design-for-efficiency’ principle, the PKM4717NH has a typical efficiency of 97.1% at 60% load and offers flat-curve characteristics from 20A to 70A, reducing power losses to the lowest possible level and making a significant contribution to the reduction of energy consumption.
Based on a bus-voltage optimization study carried out by Ericsson, the optimal fixed voltage to limit board conduction losses during step-down conversion at the Point-of-Load (POL) is believed to be 10.8V in non-‘dynamic-bus-voltage’ applications. This bus voltage is very common in datacom applications that no longer require the standard 12V supply to power disk drives. However, if this level is required for local sub-functions, then step-up POL converters can easily generate a 12V supply.
The PKM4717NH is also perfectly suitable as a replacement for existing 9.6V intermediate bus applications. The PKM4717NH comes in the industry standard quarter-brick format measuring 59.9 x 36.8 x 11.4mm (2.28 x 1.45 x 0.45-inch). The PKM-NH series is also available with a baseplate for applications requiring additional cooling or a cold-wall attachment.
FOR FURTHER INFORMATION, PLEASE CONTACT
Patrick Le Fèvre
Marketing and Communication Director
Ericsson Power Modules
Phone: +46-10-716 95 07
Europe, Middle East & Africa: +46-10-716 96 20
Asia Pacific: + 86-21-5990 3258
Japan: +81 80 3363 3987
Americas: +1-972-583 6910 or +1-972-583 5254
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