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exceeds the acquisition cost in approximately three years. As a result of the increasing impact of energy cost on the TCO, efficiency considerations have started to have a significant influence on equipment acquisition decisions, starting of course from the SMPS selection. In addition, the increasing power consumption of IT equipment and in particular that of fast-growing large data center facilities has started to have a serious environmental impact, especially in terms of CO2 emission. A third important component affecting the TCO is the reliability of components, since repairs can be costly in labor and reserve-capacity provisioning. A similar but maybe less tangible element affecting the TCO is the serviceability of the servers, which involves the time, and therefore the cost of repairs and upgrades. The size and weight of the components, especially the SMPS, may significantly influence this parameter. For this reason the trend in increasing efficiency goes hand in hand with the increasing power density. Figure 4 gives a short overview of the specific impact on SMPS requirements. In fact, SMPS did not see a dramatic change in power density until the beginning of the rapid growth of the Internet: while a typical power density of server front-end power supplies was in the 10 W/in3 range just 10 years ago, the power density requirement is today in the 40 W/in3 range. As this trend continues, SMPS with more than 50W/in3 will be commonly available in few Fig. 2: The most popular efficiency standards: the 80Plus fixes the minimum efficiency requirements in typical operating condition (20, 50 and 100% loading). years. These dramatic power density gains have been primarily enabled by the availability of better components (both semiconductors and magnetics), advanced packaging techniques, but also design optimization and consequent new advanced control techniques. An important contribution to the future efficiency and power The PX8000 brings a new dimension to power analysis with the introduction of high-accuracy time-based measurement. Combining Yokogawa’s leadership in power measurement with its proven expertise in oscilloscope design, the PX8000 offers futureproof technology for the next generation of design engineers. See more at: tmi.yokogawa.com/px8000 or contact +31 88 464 1429 What do you get if you cross a scope with a power analyser? PX8000 Precision Power Scope Precision Making Time-based precision measurement of power inputs Packed with power-specific analysis capabilities Manufactured to the highest standards of quality and reliability Highly flexible configuration Familiar and user-friendly interface www.electronics-eetimes.com Electronic Engineering Times Europe March 2014 23


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