Dear Electronics Marketer,

When you pick up the April issue of Power Electronics Technology, you are sure to notice one very significant change - our parent company is now Penton Media.

For me it is almost surreal, for as many of you already know, I spent sixteen very happy years at Penton before coming to Prism 3 years ago. I often felt as if I never completely left Penton because when I came here to work, I joined former Pentonites, Ashok Bindra, editorial director, David Morrison, editor, and John French, who is now the new Penton's CEO.

Penton Media now is much different and greater than it was. By merging with Prism it has become one of the nation's largest business-to-business media and information companies, serving more than six million business professionals every month. 

We envision this group to be collaborative and customer-focused, offering access to one of the largest databases of Design Engineers in the world. Please take a look at the Power Electronics Technology April editorial lineup. The five feature article this month includes a cover feature on Magnetic, a spotlight and a feature on medical power supplies and battery/portable management--offering the best editorial environment to complement your message.

Also starting in April, Power Electronics Technology www.powerelectronics.com will be running a special online section on Power Over Ethernet that will provide in-depth design information for engineers building both the power sourcing equipment (PSE) and powered devices (PDs) that use PoE technology.

Right now, Power over Ethernet is one of the hottest topics that enables voice-over IP phones, WLAN access points, and countless other types of powered devices (PDs) to be powered by the Ethernet cable, eliminating the need for external power supplies. Component vendors are enabling this technology by developing ICs, magnetics, and other components that make PoE equipment effective and affordable. Demand for these components is great as market forecasts call for many millions of PoE-equipped Ethernet ports and powered devices to be shipped this year. 

We will drive traffic to the section though a print campaign in the regular issue of Power Electronics Technology and our e-newsletter PE TECH Times which is read weekly by over 25,000 qualified designers and systems engineers. Please contact me today for details on sponsorship opportunities.

Who says you can't go home again? Please drop me an email at my new Penton address judy.miller@penton.com and let me know your thoughts. Your contribution is what clarifies our vision as we confront the multiple possibilities  and outcomes of the new Penton Media.

Best Regards,

Judy Miller
Associate Publisher
212-204-4246

Cover Story: Magnetics
New Inductor Approaches for Processor Power
Each generation of microprocessor puts more difficult requirements on the processor power voltage regulator circuit and make it necessary to evaluate new approaches for inductors used for processor power. These requirements include faster transient response, more accurate current sensing, increasing customer focus on product efficiency, Energy Star mandates and thermal management issues. In this article, the author compares the efficiency, physical size, cost and tolerances of four proposed inductor solutions in attempt to determine the most suitable approach for computing applications. 

Power Semiconductors:
Power MOSFETs for Linear Applications
Applications like electronic loads and linear regulators operate in the linear region of the power MOSFET, which requires high power dissipation capability and extended forward-bias safe operating area (FBSOA) characteristics. In this feature, the author explores how the linear mode of operation differs from the usual on-off operation of a power MOSFET. The author also describes how a new series of linear power MOSFETs with a novel device design overcomes the limitations of conventional power MOSFETs when operating in the linear region.

Power Management:
On-Time Extension Shrinks Capacitors in Flyback Power Supplies
Supply line disturbances such as voltage sags can result in a significant reduction of rectified dc bus voltage, causing switching power supplies to lose output voltage regulation. A new control technique know as on-time extension enables flyback power supplies to maintain regulation even when subjected to unusual drops in dc bus voltage. For applications that need long hold up time, on-time extension enables use of a smaller input capacitor as compared to conventional fixed-frequency power supply schemes. In this article, the author explains how the on-time extension technique works and illustrates how it can reduce input capacitor size in a microprocessor power application.

Battery/Portable Power Management:
A Standardized Procedure for Testing: Battery Charger Efficiency
Battery chargers vary widely in their efficiency according to Ecos Consulting. When the firm tested dozens of battery charging products it discovered efficiencies could be as low as 3% or as high as 70%, depending on the design decisions made by the manufacturer. In this article, the authors share their test results and discuss a standardized test procedure developed for measuring battery charger efficiency. 

EMI/Power Protection:
Filter and Safety Requirements Shape Medical Power Supply Design
Designers of medical power supplies must balance often conflicting performance and safety requirements. While performance requirements often become more stringent due to the needs of the application, safety requirements also change as standards are periodically revised. In this feature, the author discusses the tradeoffs that must be made when designing or selecting input filters to achieve the desired EMI performance while also maintaining sufficiently low leakage to satsify the safety standards. In addition, the author will discuss the impact of changes to the IEC 60601-1 standard when the 3 rd edition requirements take effect in 2010.

Spotlight on Medical Power Supplies:
This feature presents a round up of recently introduced power supplies for medical applications.

Executive Viewpoint :
Kevin Parmenter of Fairchild Semi writes on the dangers posed by poorly designed and manufactured power supplies masquerading as true, medical grade power supplies. 

Imagine having 30 years of Power Electronics Technology magazine at your fingertips. Now you can in one DVD!
Presenting the first-ever, historical look back at the last thirty years in the power electronics industry. This ground breaking DVD is a searchable database of articles and issue covers dating back to the launch of our magazine in 1975, then called Solid-State Power Conversion. Designed as a research tool for electronics engineers, the DVD offers you the evolution of the industry at your fingertips! Call your sales rep for more info.

Sponsored by
National Semiconductor

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