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Dear Sir/Madam
Dear…
No doubt – the modern world is power hungry! The industry in general, communication, networking, digital entertainment devices, and - not to forget - home appliances “eating” a lot of energy. No wonder that the industry is working heavily to find alternative sources of energy and make the available ones as effective as possible. In this newsletter you´ll find some solutions. Enjoy!
Wolfgang Patelay
Technical Editor, EPN
Fuel-Cell Solution (UltraCell)
UltraCell has announced that its XX25 cell now meets the power-source specifications that have been set by Getac for its V100 series of rugged laptop products. The fuel cell manages to deliver up to 25W of continuous maximum power and weighs just 1.24kg (roughly a third of the weight which would nomally be expected for a standard battery alternative).
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High-Power-Density PSU (XP Power)
The SDC320 AC/DC power-supply unit from UK-based manufacturer XP Power offers a choice of four formats: two of these use convection cooling or system airflow, and the other two feature internal fan-cooling systems. The compact 320W unit, measuring 101.6x152.4x38.10mm, has a power density of above 8.9W/".
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Power-Factor Module (Emerson Network Power)
Emerson has launched a 720W power-factor-correction module that has a 61x89mm footprint and a mounting height of 14mm, making it suitable for space-constrained applications. The AIT02ZPFC features a universal input that accepts any voltage in the range of 85 to 264VAC at any frequency from 47 to 63Hz and from 360 to 800Hz.
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Precision HV Power Supplies (AMS Technologies)
The E series of precision, enhanced power supplies operates at up to 15kV at 4W. Specifications include a tight temperature coefficient of =10ppm for the +10VDC reference, output voltage monitor, and HV output.
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A Practical Case Study In Low-Power Design Methodology
There can be little doubt that a majority of designers and managers are searching for improved solutions to low-power design requirements. While some may be neophytes, looking to to better understand low-power concepts, terminology, and basic techniques, many experts will be seeking proven capability and interoperability supporting advanced techniques they understand but cannot properly implement with traditional flows. Stephen E. Schulz from Silicon Integration Initiative shows a solution for his issue.
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Power-Driven Layout and Advanced Power Analysis
With the exponential growth of portable consumer, industrial, medical, automotive, and military applications, systems must have lower power semiconductors that extend battery life. In response, the industry as a whole has made great strides in providing power-efficient chips and systems. However, unless power-conscious designers are able to further minimise power consumption in their design, these low-power devices may not be enough, shows Fred Wickersham from Actel in his article.
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Single-supply circuit measures 48V high-side current
The nominal -48V rail, which finds wide use in wireless base stations and other telecommunications equipment in network central offices, can vary from -48 to -60V. Measuring its current draw typically requires components that operate on ±15V dual supplies. Eliminating the negative supply would reduce system complexity and cost. This Design Idea by Wenshuai Liao, Analog Devices, Beijing, China; Stephen Lee, Analog Devices, Wilmington, Massachusetts; and Yanhui Zhao, Beihang University, Beijing, China uses an AD629 difference amplifier and an AD8603 operational amplifier, both from Analog Devices, to measure current at -48 to -60V and operates from a single positive-power supply.
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Isolated supply powers DVM module
Low-cost DVM (digital-voltmeter) modules are economical and can significantly reduce design time for instrumentation. Yet, these modules also involve a significant number of design challenges. For example, their inputs are not isolated from the power supply, so you must add an isolated power supply. The power-supply design in the Design Idea by Richard Dunipace from Fairchild Semiconductor is a blocking oscillator that operates as a flyback converter with fixed on-time and variable off-time. The variable off-time regulates how often the transformer charges and delivers power to the load and isolates the DVM module.
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4| Market Research |
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Consumer Electronics Market to Continue Expansion Through 2011
The worldwide market for consumer electronics products continues to be strong and will continue to expand through 2011, reports In-Stat. Shipments of personal computers and peripherals, traditional consumer electronics products, and communications products will grow from 2.7 billion units in 2007 to 3.1 billion units in 2011, the high-tech market research firm says.
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5| Book of the Month |
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Electric Motors and Drives, 3rd Edition, by Austin Hughes
Electric Motors and Drives is intended for non-specialist users of electric motors and drives, filling the gap between maths- and theory-based academic textbooks and the more prosaic 'handbooks', which provide useful detail but little opportunity for the development of real insight and understanding. The book explores all of the widely-used modern types of motor and drive, including conventional and brushless D.C., induction motors and servo drives.
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